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Sample records for synthetic hemodialysis grafts

  1. Effect of fish oil supplementation on graft patency and cardiovascular events among patients with new synthetic arteriovenous hemodialysis grafts: a randomized controlled trial.

    Science.gov (United States)

    Lok, Charmaine E; Moist, Louise; Hemmelgarn, Brenda R; Tonelli, Marcello; Vazquez, Miguel A; Dorval, Marc; Oliver, Matthew; Donnelly, Sandra; Allon, Michael; Stanley, Kenneth

    2012-05-02

    Synthetic arteriovenous grafts, an important option for hemodialysis vascular access, are prone to recurrent stenosis and thrombosis. Supplementation with fish oils has theoretical appeal for preventing these outcomes. To determine the effect of fish oil on synthetic hemodialysis graft patency and cardiovascular events. The Fish Oil Inhibition of Stenosis in Hemodialysis Grafts (FISH) study, a randomized, double-blind, controlled clinical trial conducted at 15 North American dialysis centers from November 2003 through December 2010 and enrolling 201 adults with stage 5 chronic kidney disease (50% women, 63% white, 53% with diabetes), with follow-up for 12 months after graft creation. Participants were randomly allocated to receive fish oil capsules (four 1-g capsules/d) or matching placebo on day 7 after graft creation. Proportion of participants experiencing graft thrombosis or radiological or surgical intervention during 12 months' follow-up. The risk of the primary outcome did not differ between fish oil and placebo recipients (48/99 [48%] vs 60/97 [62%], respectively; relative risk, 0.78 [95% CI, 0.60 to 1.03; P = .06]). However, the rate of graft failure was lower in the fish oil group (3.43 vs 5.95 per 1000 access-days; incidence rate ratio [IRR], 0.58 [95% CI, 0.44 to 0.75; P oil group, there were half as many thromboses (1.71 vs 3.41 per 1000 access-days; IRR, 0.50 [95% CI, 0.35 to 0.72; P oil ingestion did not decrease the proportion of grafts with loss of native patency within 12 months. Although fish oil improved some relevant secondary outcomes such as graft patency, rates of thrombosis, and interventions, other potential benefits on cardiovascular events require confirmation in future studies. isrctn.org Identifier: ISRCTN15838383.

  2. Utility of Covered Stents for Revision of Aging Failing Synthetic Hemodialysis Grafts: A Report of Three Cases

    International Nuclear Information System (INIS)

    Silas, Anne M.; Bettmann, Michael A.

    2003-01-01

    Three aging failing hemodialysis polytetrafluoroethylene bypass shunts, average age 44 months, previously percutaneously revised with balloon angioplasty, presented with pseudoaneurysms and recurrent thrombosis. All were treated with percutaneous covered stent placement within their affected limbs. One graft was ligated 1 month after treatment for infected overlying skin ulcer, though this graft was subsequently surgically revised with interposition graft and the covered stent portion remains functional at 19 month follow-up. The 18- and 13- month follow- up of the remaining 2 patients shows that the covered stents remained patent and they are functional and being successfully and routinely punctured for dialysis. In this elderly population, the use of covered stents may prolong the functional life of failing hemodialysis bypass grafts, reducing the number of percutaneous and surgical interventions and further sparing other vascular access sites

  3. Successful endovascular treatment of a hemodialysis graft pseudoaneurysm by covered stent and direct percutaneous thrombin injection.

    LENUS (Irish Health Repository)

    Keeling, Aoife N

    2011-07-25

    Vascular access for hemodialysis remains a challenge for nephrologists, vascular surgeons, and interventional radiologists alike. Arteriovenous fistula and synthetic grafts remain the access of choice for long-term hemodialysis; however, they are subject to complications from infection and repeated needle cannulation. Pseudoaneurysms are an increasingly recognized adverse event. At present, there are many minimally invasive methods to repair these wall defects. We present a graft pseudoaneurysm, which required a combination of endovascular stent graft placement and percutaneous thrombin injection for successful occlusion.

  4. A multilayered electrospun graft as vascular access for hemodialysis.

    Science.gov (United States)

    Radakovic, D; Reboredo, J; Helm, M; Weigel, T; Schürlein, S; Kupczyk, E; Leyh, R G; Walles, H; Hansmann, J

    2017-01-01

    Despite medical achievements, the number of patients with end-stage kidney disease keeps steadily raising, thereby entailing a high number of surgical and interventional procedures to establish and maintain arteriovenous vascular access for hemodialysis. Due to vascular disease, aneurysms or infection, the preferred access-an autogenous arteriovenous fistula-is not always available and appropriate. Moreover, when replacing small diameter blood vessels, synthetic vascular grafts possess well-known disadvantages. A continuous multilayered gradient electrospinning was used to produce vascular grafts made of collagen type I nanofibers on luminal and adventitial graft side, and poly-ɛ-caprolactone as medial layer. Therefore, a custom-made electrospinner with robust environmental control was developed. The morphology of electrospun grafts was characterized by scanning electron microscopy and measurement of mechanical properties. Human microvascular endothelial cells were cultured in the graft under static culture conditions and compared to cultures obtained from dynamic continuous flow bioreactors. Immunofluorescent analysis showed that endothelial cells form a continuous luminal layer and functional characteristics were confirmed by uptake of acetylated low-density-lipoprotein. Incorporation of vancomycin and gentamicin to the medial graft layer allowed antimicrobial inhibition without exhibiting an adverse impact on cell viability. Most striking a physiological hemocompatibility was achieved for the multilayered grafts.

  5. Experience with chest wall arteriovenous grafts in hemodialysis patients.

    Science.gov (United States)

    Liechty, Joseph M; Fisher, Tammy; Davis, Wilson; Oglesby, Wes C; Bennett, Monica; Grimsley, Brad; Shutze, William

    2015-01-01

    Maintaining long-term hemodialysis access in end-stage renal disease patients presents a serious challenge to surgeons. Over time, patients' remaining access sites diminish while complications and comorbidities simultaneously multiply; often resulting in the use of permanent tunneled catheters, which have a well-known high rate of complications and short-term usefulness. In this study, we report the results of a dialysis graft based on the axillary artery and ipsilateral axillary vein and tunneled in the subcutaneous tissues of the chest. We identified patients who had a chest wall arteriovenous graft (CWAVG) placed at our institution between May 2007 and December 2012. After institutional review board approval, the patients were retrospectively and then prospectively identified and followed for 2 years to document the performance, required maintenance, and complications of the graft. Sixty-seven grafts in 67 patients were reviewed, representing 0.56% of our 1,192 total dialysis access creations during the study period. The average patient was 55-year-old with an average history of 3.97 explicitly documented prior accesses. Sixty interventions were performed postoperatively including 32 for thrombosis and 28 for venous stenosis. Six documented graft infections occurred (9%). Three minor wound complications occurred, but the graft was preserved. Notably, no patient developed symptoms of steal syndrome. The primary and secondary patency rates at 1 and 2 years were 69.5% and 36.9% and 81.6% and 57.6%, respectively. Twenty-three of the 67 patients died in the 2-year follow-up period (34%). CWAVGs are useful and appropriate for patients with difficult upper extremity access. The patency rates for this "exotic" procedure are at least equivalent to other upper extremity grafts. The infection rate is lower than that for femoral grafts or tunneled catheters, and there is no risk of steal syndrome. CWAVGs can even be considered for primary use in patients who have

  6. Fixation of tibial plateau fractures with synthetic bone graft versus natural bone graft: a comparison study.

    LENUS (Irish Health Repository)

    Ong, J C Y

    2012-06-01

    The goal of this study was to determine differences in fracture stability and functional outcome between synthetic bone graft and natural bone graft with internal fixation of tibia plateau metaphyseal defects.

  7. Calcification of a Synthetic Renovascular Graft in a Child

    Directory of Open Access Journals (Sweden)

    D.S.T. Chong

    Full Text Available : Introduction: Vascular grafts, especially in paediatric cases, need to be durable. Common failures such as thrombosis are well documented with research efforts directed towards them. However, there are lesser known causes of graft failure, such as graft calcification, and these also require further research focus. Report: A paediatric case is described in which a synthetic renovascular graft, implanted for mid-aortic syndrome, became calcified, necessitating surgical intervention to resolve graft malfunction. Significant calcification in the limb of a bifurcated polyethylene terephthalate graft was found to be the cause of resistant stenosis and refractory hypertension. Histology conducted on the explanted limb showed the presence of multinuclear giant cells, indicating a chronic foreign body response. Discussion: Calcification of vascular grafts is probably more common than previously recognised. Stenosis typically resistant to angioplasty may result in the long term and thus leading to surgical intervention. In young children, this is suboptimal as these grafts need to last throughout adulthood. Explanted prosthetic grafts should be sent to specialist registries such as that in Strasbourg to be optimally assessed so that contributory factors can be identified. Keywords: Renovascular graft, Paediatric, Calcification

  8. Evaluation of synthetic vascular grafts in a mouse carotid grafting model.

    Directory of Open Access Journals (Sweden)

    Alex H P Chan

    Full Text Available Current animal models for the evaluation of synthetic grafts are lacking many of the molecular tools and transgenic studies available to other branches of biology. A mouse model of vascular grafting would allow for the study of molecular mechanisms of graft failure, including in the context of clinically relevant disease states. In this study, we comprehensively characterise a sutureless grafting model which facilitates the evaluation of synthetic grafts in the mouse carotid artery. Using conduits electrospun from polycaprolactone (PCL we show the gradual development of a significant neointima within 28 days, found to be greatest at the anastomoses. Histological analysis showed temporal increases in smooth muscle cell and collagen content within the neointima, demonstrating its maturation. Endothelialisation of the PCL grafts, assessed by scanning electron microscopy (SEM analysis and CD31 staining, was near complete within 28 days, together replicating two critical aspects of graft performance. To further demonstrate the potential of this mouse model, we used longitudinal non-invasive tracking of bone-marrow mononuclear cells from a transgenic mouse strain with a dual reporter construct encoding both luciferase and green fluorescent protein (GFP. This enabled characterisation of mononuclear cell homing and engraftment to PCL using bioluminescence imaging and histological staining over time (7, 14 and 28 days. We observed peak luminescence at 7 days post-graft implantation that persisted until sacrifice at 28 days. Collectively, we have established and characterised a high-throughput model of grafting that allows for the evaluation of key clinical drivers of graft performance.

  9. Biomaterial-Based Approaches to Address Vein Graft and Hemodialysis Access Failures.

    Science.gov (United States)

    Boire, Timothy C; Balikov, Daniel A; Lee, Yunki; Guth, Christy M; Cheung-Flynn, Joyce; Sung, Hak-Joon

    2016-12-01

    Veins used as grafts in heart bypass or as access points in hemodialysis exhibit high failure rates, thereby causing significant morbidity and mortality for patients. Interventional or revisional surgeries required to correct these failures have been met with limited success and exorbitant costs, particularly for the US Centers for Medicare & Medicaid Services. Vein stenosis or occlusion leading to failure is primarily the result of neointimal hyperplasia. Systemic therapies have achieved little long-term success, indicating the need for more localized, sustained, biomaterial-based solutions. Numerous studies have demonstrated the ability of external stents to reduce neointimal hyperplasia. However, successful results from animal models have failed to translate to the clinic thus far, and no external stent is currently approved for use in the US to prevent vein graft or hemodialysis access failures. This review discusses current progress in the field, design considerations, and future perspectives for biomaterial-based external stents. More comparative studies iteratively modulating biomaterial and biomaterial-drug approaches are critical in addressing mechanistic knowledge gaps associated with external stent application to the arteriovenous environment. Addressing these gaps will ultimately lead to more viable solutions that prevent vein graft and hemodialysis access failures. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  10. Modification of synthetic fibers by radiation-induced grafting

    International Nuclear Information System (INIS)

    Kaji, Kanako

    1981-05-01

    The present report describes studies to modify properties of synthetic fibers by radiation-induced grafting technique. This technique was employed since it is considered to be generally applicable to the grafting of a radically polymerizable monomer onto fiber. Three synthetic fibers were used mainly in the present studies; (1) polyester fiber which is ranked as the first in the amount of production in the synthetic fibers at present and is expected to increase in its importance in the future, (2) poly (vinyl chloride) fiber which is inexpensive and fire-retardant, and (3) polyethylene fiber which is not yet used in apparel at present. In order to perform the grafting, the following two methods were studied; one is to graft monomer uniformly in the fiber preventing homopolymerization of the monomer outside of the fiber, and the other to graft monomer only on the fiber surface. Using these methods, the following experiments were carried out and fairly good results as expected were obtained. (1) In the case of polyester fiber it was intended to make this more hydrophilic and fire-retardant. (2) Concerning to poly(vinyl chloride) fiber experiments were carried out to make the fiber more hydrophilic and simultaneously more heat-resistant. (3) In the case of polyethylene fiber, target was fire-retardance and heat-resistance. (author)

  11. Endovascular Revascularization of Hemodialysis Thrombosed Grafts with the Hydrodynamic Thrombectomy Catheter. Our 7-Year Experience

    Energy Technology Data Exchange (ETDEWEB)

    Bermudez, Patrícia, E-mail: pbermude@clinic.ub.es [Clinic Hospital of Barcelona, Vascular and Interventional Radiology Unit, Diagnostic Imaging Institute (Spain); Fontseré, Nestor, E-mail: fontsere@clinic.ub.es [Clinic Hospital of Barcelona, Vascular Access Unit, Nephrologic and Urologic Diseases Clinical Institute (Spain); Mestres, Gaspar, E-mail: gmestres@clinic.ub.es [Clinic Hospital of Barcelona, Cardiovascular Diseases Institute (Spain); García-Gámez, Andres, E-mail: garciagam@clinic.ub.es; Barrufet, Marta, E-mail: barrufet@clinic.ub.es; Burrel, Marta, E-mail: mburrel@clinic.ub.es; Gilabert, Rosa, E-mail: gilabert@clinic.ub.es; Gómez, Fernando, E-mail: fegomez@clinic.ub.es; Macho, Juan, E-mail: jmmacho@clinic.ub.es [Clinic Hospital of Barcelona, Vascular and Interventional Radiology Unit, Diagnostic Imaging Institute (Spain)

    2017-02-15

    PurposeTo evaluate the efficacy and safety of the hydrodynamic thrombectomy catheter (AngioJet DVX) in the salvage of thrombosed hemodialysis vascular grafts.Materials and MethodsA retrospective study was designed, including all patients with occluded arteriovenous grafts treated with the AngioJet system between 2007 and 2014 in our institution. Outcomes included technical success, clinical success, complications, and primary and secondary patencies. Procedural success was defined as angiographic confirmation of flow restoration, the presence of a pulsatile thrill along the graft, and successful resumption of at least one hemodialysis session. Primary and secondary patencies after first AVG thrombectomy were calculated with Kaplan–Meier curves. Cox regression was used to determine prognostic factors of primary patency after every thrombectomy episode.ResultsA total of 149 thrombectomies were performed in 68 grafts. After thrombectomy, endovascular treatment of one or more stenosis was performed in all cases. Technical success was 93% and clinical success was 86%. Complications occurred in 7 thrombectomies, most of them were minor except for one anastomosis rupture requiring surgery. Primary and secondary patencies were 52, 41, and 23 and 76, 68, and 57% at 3, 6 and 12 months, respectively. Independent prognostic factors of poor patency after every thrombectomy episode were the presence of residual thrombus (OR 1.831, P = 0.008) and time from last thrombosis (less than 1 month; and OR 7.116, P < 0.001).ConclusionPercutaneous mechanical thrombectomy with AngioJet is a safe technique with a high-clinical success rate. The presence of residual thrombus after thrombectomy and early re-occlusions are related to poorer results.

  12. PTFE grafts versus tunneled cuffed catheters for hemodialysis: which is the second choice when arteriovenous fistula is not feasible?

    Science.gov (United States)

    Donati, Gabriele; Cianciolo, Giuseppe; Mauro, Raffaella; Rucci, Paola; Scrivo, Anna; Marchetti, Antonio; Giampalma, Emanuela; Golfieri, Rita; Panicali, Laura; Iorio, Mario; Stella, Andrea; La Manna, Gaetano; Stefoni, Sergio

    2015-02-01

    Vascular access-related complications are still one of the leading causes of morbidity in hemodialysis patients. The aim of this study was to compare polytetrafluoroethylene (PTFE) grafts versus tunneled cuffed permanent catheters (TCCs) in terms of vascular access and patients' survival. An observational study was carried out with a 2-year follow-up. Eighty-seven chronic hemodialysis patients were enrolled: 31 with a PTFE graft as vascular access for hemodialysis versus 56 with a TCC. Patients' mean age was 63.8 ± 14.6 (grafts) versus 73.5 ± 11.3 years (TCCs), P = 0.001. Significantly more patients with TCC had atrial fibrillation than patients with grafts (30.3% versus 6.5%, P = 0.01). In an unadjusted Kaplan-Meier analysis, median TCC survival at 24 months was 5.4 months longer than that of PTFE grafts but not significantly (log-rank test = 1.3, P = ns). In a Cox regression analysis adjusted for age, gender, number of previous vascular accesses, diabetes, atrial fibrillation, smoking, and any complication, this lack of significant difference in survival of the vascular access between TCC and PTFE groups was confirmed and diabetes proved to be an independent risk factor for the survival of both vascular accesses considered (P = 0.02). In an unadjusted Kaplan-Meier analysis, a higher mortality was found in the TCC group than in the PTFE group at 24 months (log-rank test = 10.07, P PTFE grafts. When an arteriovenous fistula (AVF) is not possible, PTFE grafts can be considered the vascular access of second choice, whereas TCCs can be used when an AVF or PTFE graft are not feasible or as a bridge to AVF or PTFE graft creation. Copyright © 2014 International Center for Artificial Organs and Transplantation and Wiley Periodicals, Inc.

  13. Interventional recanalization of artificial arteriovenous fistula and graft for hemodialysis: angioplasty and pulsed-spray thrombolysis with Urokinase

    International Nuclear Information System (INIS)

    Shin, Sung Wook; Do, Young Soo; Park, Hong Seok and others

    1998-01-01

    To evaluate the effectiveness of percutaneous transluminal angioplasty (PTA) and pul-sed-spray pharmaco-mechanical thrombolysis (PSPMT) using urokinase for the management of insufficient hemodialysis access. Between September 1996 and May 1998, 21 insufficient hemodialysis accesses were treated in 16 patients(3 artificial arteriovenous fistulae, AVF; and 13 arteriovenous graft, AVG). PTA and PSPMT were performed in 6 and 15 cases, respectively, and success and long-term patency rates were evaluated. The overall success rate of PTA and PSPMT for insufficient hemodialysis access was 76. 2%(16/21). The success rates of PTA and PSPMT were 83.3%(5/6) and 73.3%(11/15), respectively. The primary patency rates of PSPMT were 69±12.8% at 6 months and 38±18.6% at 12 months. One of the two initially successful PTAs had been patent for 7 months, and the second PTA was performed at that time due to venous stenosis. The other was patent for 15 months throughout the follow-up period. PTA and PSPMT are effective primary methods for the treatment of insufficient hemodialysis access;success and patency rates were high, and the procedures can be performed repeatedly.=20

  14. SANS and SAXS Study of Block and Graft Copolymers Containing Natural and Synthetic Rubbers

    Science.gov (United States)

    Hasegawa, H.

    2008-03-01

    Small-angle neutron scattering (SANS) and small-angle X-ray scattering (SAXS) are excellent techniques to study nano-scale concentration fluctuations in the two-component polymer systems such as block and graft copolymers and polymer blends. The miscibility, phase transitions, microphase-separated structures and interface thicknesses were investigated by SANS and SAXS for the block and graft copolymers, which at least contain natural or synthetic rubber as one component.

  15. Laccase-Mediated Grafting on Biopolymers and Synthetic Polymers

    NARCIS (Netherlands)

    Slagman, Sjoerd; Zuilhof, Han; Franssen, Maurice C.R.

    2018-01-01

    Laccase-mediated grafting on lignocelluloses has gained considerable attention as an environmentally benign method to covalently modify wood, paper and cork. In recent decades this technique has also been employed to modify fibres with a polysaccharide backbone, such as cellulose or chitosan, to

  16. Convenient synthetic method of starch/lactic acid graft copolymer ...

    Indian Academy of Sciences (India)

    Copolymer of starch grafted with lactic acid (LA) could be directly prepared by reaction of cornstarch with lactic acid and with sodium hydroxide (NaOH) as the catalyst. The structure of starch/LA copolymer was characterized by IR, XRD, SEM and 1H-NMR. The effects of NaOH concentration, ratios of starch and LA, reaction ...

  17. Treatment of hemodialysis vascular access arteriovenous graft failure by percutaneous intervention

    NARCIS (Netherlands)

    Planken, Robrecht Nils; van Kesteren, Floortje; Reekers, Jim A.

    2014-01-01

    A patent vascular access is the lifeline of end-stage renal disease patients depending on hemodialysis treatment. Once a functioning vascular access has been established, maintaining its patency is of utmost importance. During the last decades percutaneous techniques became increasingly important

  18. The manufacture of synthetic non-sintered and degradable bone grafting substitutes.

    Science.gov (United States)

    Gerike, W; Bienengräber, V; Henkel, K-O; Bayerlein, T; Proff, P; Gedrange, T; Gerber, Th

    2006-02-01

    A new synthetic bone grafting substitute (NanoBone, ARTOSS GmbH, Germany) is presented. This is produced by a new technique, the sol-gel-method. This bone grafting substitute consists of nanocrystalline hydroxyapatite (HA) and nanostructured silica (SiO2). By achieving a highly porous structure good osteoconductivity can be seen. In addition, the material will be completely biodegraded and new own bone is formed. It has been demonstrated that NanoBone is biodegraded by osteoclasts in a manner comparable to the natural bone remodelling process.

  19. Diagnostic value of color Doppler ultrasonography and MDCT angiography in complications of hemodialysis fistulas and grafts

    Energy Technology Data Exchange (ETDEWEB)

    Cansu, Aysegul, E-mail: drcansu@gmail.com [Department of Radiology, Karadeniz Technical University, School of Medicine, Farabi Hospital, 61080 Trabzon (Turkey); Soyturk, Mehmet; Ozturk, Mehmet Halil; Kul, Sibel [Department of Radiology, Karadeniz Technical University, School of Medicine, Farabi Hospital, 61080 Trabzon (Turkey); Pulathan, Zerrin [Department of Cardiovascular Surgery, Karadeniz Technical University, School of Medicine, Farabi Hospital, 61080 Trabzon (Turkey); Dinc, Hasan [Department of Radiology, Karadeniz Technical University, School of Medicine, Farabi Hospital, 61080 Trabzon (Turkey)

    2013-09-15

    Purpose: The purpose of the study was to compare the diagnostic value of color Doppler ultrasonography (CDUS) and multidetector computed tomography (MDCT) angiography against that of digital subtraction angiography (DSA) or surgery in the evaluation of failing hemodialysis arteriovenous fistulas (AVFs). Materials and methods: CDUS and MDCT angiography were performed with 41 patients (24 men, 17 women; mean age 55.8) with dysfunctional hemodialysis fistulas. The presence of stenosis, thrombosis, aneurysm, pseudoaneurysm and seroma were recorded. The sensitivity, specificity, positive and negative predictive values (PPV and NPV) and accuracy of CDUS and MDCT angiography were calculated both individually and in combination for the detection of vascular segments with significant stenosis, thrombosis, aneurysms, pseudoaneurysms, perivascular complications and stenosis subgroups. Results: Sixty-four segmental lesions were diagnosed by DSA or surgery. Sensitivity, specificity, PPV, NPV and accuracy of CDUS for all vascular tree lesions were 85.9%, 99.2%, 96.4%, 96.7% and 94.5%, respectively. For MDCT angiography the figures were 96.8%, 99.6%, 98.4%, 99.2% and 98.5%, respectively. When both tests were used in combination, sensitivity, specificity, PPV, NPV and accuracy for all vascular tree lesions rose to 100%. Conclusion: Combined use of MDCT and CDUS for diagnosis of AVF dysfunctions is of equivalent value to surgery or DSA, a gold standard technique.

  20. Anterior cruciate ligament reconstruction with synthetic grafts. A review of literature

    Science.gov (United States)

    Ventura, Alberto; Terzaghi, Clara; Borgo, Enrico; Albisetti, Walter

    2010-01-01

    Anterior cruciate ligament (ACL) rupture, one of the most common knee injuries in sports, results in anteroposterior laxity, which often leads to an unstable knee. Traditional ACL reconstruction is performed with autograft; disadvantages of this technique are donor site morbidity and a long rehabilitation period. In the 1980s, artificial ligaments became an attractive alternative to biological grafts. The initial enthusiasm surrounding their introduction stemmed from their lack of donor morbidity, their abundant supply and significant strength, immediate loading and reduced postoperative rehabilitation. Synthetic grafts made of different materials such as carbon fibers, polypropylene, Dacron and polyester have been utilised either as a prosthesis or as an augmentation for a biological ACL graft substitute. Nevertheless, every material presented serious drawbacks: cross-infections, immunological responses, breakage, debris dispersion leading to synovitis, chronic effusions, recurrent instability and knee osteoarthritis. Recently, a resurgence of interest in the use of synthetic prostheses has occurred and studies regarding new artificial grafts have been reported. Although many experimental studies have been made and much effort has been put forth, currently no ideal prosthesis mimicking natural human tissue has been found. PMID:20157811

  1. Full-thickness skin graft vs. synthetic mesh in the repair of giant incisional hernia: a randomized controlled multicenter study.

    Science.gov (United States)

    Clay, L; Stark, B; Gunnarsson, U; Strigård, K

    2018-04-01

    Repair of large incisional hernias includes the implantation of a synthetic mesh, but this may lead to pain, stiffness, infection and enterocutaneous fistulae. Autologous full-thickness skin graft as on-lay reinforcement has been tested in eight high-risk patients in a proof-of-concept study, with satisfactory results. In this multicenter randomized study, the use of skin graft was compared to synthetic mesh in giant ventral hernia repair. Non-smoking patients with a ventral hernia > 10 cm wide were randomized to repair using an on-lay autologous full-thickness skin graft or a synthetic mesh. The primary endpoint was surgical site complications during the first 3 months. A secondary endpoint was patient comfort. Fifty-three patients were included. Clinical evaluation was performed at a 3-month follow-up appointment. There were fewer patients in the skin graft group reporting discomfort: 3 (13%) vs. 12 (43%) (p = 0.016). Skin graft patients had less pain and a better general improvement. No difference was seen regarding seroma; 13 (54%) vs. 13 (46%), or subcutaneous wound infection; 5 (20%) vs. 7 (25%). One recurrence appeared in each group. Three patients in the skin graft group and two in the synthetic mesh group were admitted to the intensive care unit. No difference was seen for the primary endpoint short-term surgical complication. Full-thickness skin graft appears to be a reliable material for ventral hernia repair producing no more complications than when using synthetic mesh. Patients repaired with a skin graft have less subjective abdominal wall symptoms.

  2. Better primary stability with porous titanium particles than with bone particles in cemented impaction grafting: An in vitro study in synthetic acetabula

    NARCIS (Netherlands)

    Walschot, L.H.B.; Aquarius, R.; Schreurs, B.W.; Buma, P.; Verdonschot, Nicolaas Jacobus Joseph

    2013-01-01

    Aims Impaction bone grafting creates new bone stock after hip joint replacement. Utilizing a synthetic bone substitute instead of bone might increase primary stability and is not associated with graft shortage and pathogen transmission. This study compares the initial stability of a graft layer of

  3. Immobilization of a bone and cartilage stimulating peptide to a synthetic bone graft.

    Science.gov (United States)

    Wang, Vivian; Misra, Gauri; Amsden, Brian

    2008-05-01

    A synthetic peptide fragment of human collagen type I (BCSP-1) was linked to the surface of a commercially available ceramic in an effort to improve the properties of the bone graft substitute to accelerate local healing. BCSP-1 was covalently immobilized on the surface of the ceramic via the linkers 3-aminopropyl-triethoxysilane (APTES) and suberic acid bis-N-hydroxysuccinimide ester (DSS). The chosen chemistry was non-cytotoxic. A rat calvaria cell assay using alkaline phosphatase (ALP) as an osteoblast differentiation marker, showed that modifying the surface of the ceramic was enough to enhance ALP activity, although the total cell population on the surface decreased. A significant increase in ALP activity/cell was noted with serum albumin bound to the surface, however, the BCSP-1 bound surface exhibited an even greater ALP activity that showed a surface concentration dependent trend. An optimal BCSP-1 surface density in the range of 0.87-2.24 nmol/cm2 elicited the maximum ALP activity/cell at day 6 of culture. The peptide bound ceramic generated an ALP activity/cell that was roughly 3-fold higher than the non-modified ceramic and 2-fold higher than the APTES-grafted ceramic.

  4. In vivo analysis of biocompatibility and vascularization of the synthetic bone grafting substitute NanoBone.

    Science.gov (United States)

    Abshagen, K; Schrodi, I; Gerber, T; Vollmar, B

    2009-11-01

    One of the major challenges in the application of bone substitutes is adequate vascularization and biocompatibility of the implant. Thus, the temporal course of neovascularization and the microvascular inflammatory response of implants of NanoBone (fully synthetic nanocrystalline bone grafting material) were studied in vivo by using the mouse dorsal skinfold chamber model. Angiogenesis, microhemodynamics, and leukocyte-endothelial cell interaction were analyzed repetitively after implantation in the center and in the border zone of the implant up to 15 days. Both NanoBone granules and plates exhibited high biocompatibility comparable to that of cancellous bone, as indicated by a lack of venular leukocyte activation after implantation. In both synthetic NanoBone groups, signs of angiogenesis could be observed even at day 5 after implantation, whereas granules showed higher functional vessel density compared with NanoBone plates. The angiogenic response of the cancellous bone was markedly accelerated in the center of the implant tissue. Histologically, implant tissue showed an ingrowth of vascularized fibrous tissue into the material combined with an increased number of foreign-body giant cells. In conclusion, NanoBone, particularly in granular form, showed high biocompatibility and high angiogenic response, thus improving the healing of bone defects. Our results underline that, beside the composition and nanostructure, the macrostructure is also of importance for the incorporation of the biomaterial by the host tissue. (c) 2008 Wiley Periodicals, Inc.

  5. A randomized controlled trial and cost-effectiveness analysis of early cannulation arteriovenous grafts versus tunneled central venous catheters in patients requiring urgent vascular access for hemodialysis.

    Science.gov (United States)

    Aitken, Emma; Thomson, Peter; Bainbridge, Leigh; Kasthuri, Ram; Mohr, Belinda; Kingsmore, David

    2017-03-01

    Early cannulation arteriovenous grafts (ecAVGs) are proposed as an alternative to tunneled central venous catheters (TCVCs) in patients requiring immediate vascular access for hemodialysis (HD). We compared bacteremia rates in patients treated with ecAVG and TCVC. The study randomized 121 adult patients requiring urgent vascular access for HD in a 1:1 fashion to receive an ecAVG with or without (+/-) an arteriovenous fistula (AVF; n = 60) or TCVC+/-AVF (n = 61). Patients were excluded if they had active systemic sepsis, no anatomically suitable vessels, or an anticipated life expectancy vascular access for HD. The strategy also proved to be cost-neutral. Crown Copyright © 2016. Published by Elsevier Inc. All rights reserved.

  6. Indium-111-labeled leukocyte scintigraphy in hemodialysis access-site infection

    International Nuclear Information System (INIS)

    Palestro, C.J.; Vega, A.; Kim, C.K.; Vallabhajosula, S.; Goldsmith, S.J.

    1990-01-01

    Bacterial sepsis, a significant complication of chronic hemodialysis, is generally the result of infection at the vascular access site. We retrospectively reviewed the utility of indium-111-(111In) labeled autologous leukocyte scintigraphy in 26 patients (30 scans) with synthetic vascular grafts, on chronic hemodialysis, in whom hemodialysis access site infection was a diagnostic consideration. Leukocyte scintigraphy correctly identified all fifteen access-site infections; there was one false-positive study, for an overall sensitivity and specificity of 100% and 93%, respectively. Of particular significance is the fact that in nine (60%) of the fifteen access-site infections, physical examination was normal. Our data indicate that 111In-labeled leukocyte scintigraphy is a useful procedure for the diagnosis of hemodialysis access-site infection, and it is especially valuable when physical examination of the access site is normal

  7. Long-term results of PTFE grafts.

    Science.gov (United States)

    Hedin, Ulf

    2015-01-01

    Vascular surgeons are essential in "lifeline" creation for hemodialysis patients and should be the central player in any multidisciplinary access service together with nephrologists, dialysis staff and interventional radiology. In this position, access surgeons are involved in complicated clinical decision making regarding primary and secondary access selection, which throughout the last decade has been largely aided, and influenced, by national and international guidelines as well as other initiatives. These recommendations, unanimously and appropriately, advocate the placement of native fistulas over synthetic grafts (the majority grafts from expanded polytetrafluoroethylene, ePTFE, herein referred to as PTFE) based on the superiority of fistulas with respect to complications such as infections and thrombosis. Nevertheless, the use of PTFE grafts for hemodialysis access is an accepted and firmly established alternative to native fistulas where data today reveal unwanted consequences to overinterpretation of established guidelines such as increased catheter use. This information highlights a need for an adjustment of access selection strategies based on patient-centered algorithms. Here, available results on PTFE graft performance in hemodialysis access is recapitulated, with respect to both conventional grafts and technical modifications, and conclude with a modified approach to primary access selection.

  8. Evaluation of bone response to synthetic bone grafting material treated with argon-based atmospheric pressure plasma

    Energy Technology Data Exchange (ETDEWEB)

    Beutel, Bryan G., E-mail: bryanbeutel@gmail.com; Danna, Natalie R.; Gangolli, Riddhi; Granato, Rodrigo; Manne, Lakshmiprada; Tovar, Nick; Coelho, Paulo G.

    2014-12-01

    Bone graft materials are utilized to stimulate healing of bone defects or enhance osseointegration of implants. In order to augment these capabilities, various surface modification techniques, including atmospheric pressure plasma (APP) surface treatment, have been developed. This in vivo study sought to assess the effect of APP surface treatment on degradation and osseointegration of Synthograft™, a beta-tricalcium phosphate (β-TCP) synthetic bone graft. The experimental (APP-treated) grafts were subjected to APP treatment with argon for a period of 60 s. Physicochemical characterization was performed by environmental scanning electron microscopy, surface energy (SE), and x-ray photoelectron spectroscopy analyses both before and after APP treatment. Two APP-treated and two untreated grafts were surgically implanted into four critical-size calvarial defects in each of ten New Zealand white rabbits. The defect samples were explanted after four weeks, underwent histological analysis, and the percentages of bone, soft tissue, and remaining graft material were quantified by image thresholding. Material characterization showed no differences in particle surface morphology and that the APP-treated group presented significantly higher SE along with higher amounts of the base material chemical elements on it surface. Review of defect composition showed that APP treatment did not increase bone formation or reduce the amount of soft tissue filling the defect when compared to untreated material. Histologic cross-sections demonstrated osteoblastic cell lines, osteoid deposition, and neovascularization in both groups. Ultimately, argon-based APP treatment did not enhance the osseointegration or degradation of the β-TCP graft. Future investigations should evaluate the utility of gases other than argon to enhance osseointegration through APP treatment. - Highlights: • Degradation/osseointegration of bone graft treated with argon-based APP is studied. • APP treatment did

  9. The improved biological response of shark tooth bioapatites in a comparative in vitro study with synthetic and bovine bone grafts.

    Science.gov (United States)

    López-Álvarez, M; Pérez-Davila, S; Rodríguez-Valencia, C; González, P; Serra, J

    2016-06-07

    Autologous bone is considered to be the gold standard for bone tissue regeneration, providing more highly efficient functional responses compared to synthetic materials, and avoiding the rejection risks of allogenic grafts. However, it presents limitations for certain types of surgery due to its high resorption levels and donor site morbidity. Different biphasic synthetic composites, based onnon-apatitic calcium phosphates enriched with apatitic phases-such as hydroxyapatite, and bioderived bone grafts of bovine and porcine origin-are proposed as lower resorption materials due to their higher crystalline structure. The present work proposes two new sources of bioapatites for bone filler applications obtained from the dentine and enameloid of shark teeth, respectively. These bioapatites each present a characteristic apatite-based composition and additional enrichments of specific trace elements, such as magnesium and fluorine, with proven roles in bone metabolism. Their processing and physicochemical characterization (SEM, FT-Raman and XRD) is presented, together with an in vitro evaluation of osteogenic activity compared to a commercial bovine mineralized matrix and synthetic HA/β TCP grafts. The results proved the globular morphology (0.5-1.5 μm) and porosity (~50 μm and ~0.5-1 μm) of shark dentine bioapatites with biphasic composition: apatitic (hydroxyapatite and apatite-(CaF)), non-apatitic (whitlockite), and an apatitic phase (fluorapatite), organized in oriented crystals in enameloid bioapatites. An evaluation of the pre-osteoblast MC3T3-E1 morphology revealed the colonization of pores in dentine bioapatites and an aligned cell growth in the oriented enameloid crystals. A higher proliferation (p  aligned fluorapatite crystals of enameloid bioapatites in promoting greater osteogenic activity was confirmed with a significantly increased ALP synthesis (p  <  0.01) compared to the commercial grafts.

  10. Evaluation of bone response to synthetic bone grafting material treated with argon-based atmospheric pressure plasma.

    Science.gov (United States)

    Beutel, Bryan G; Danna, Natalie R; Gangolli, Riddhi; Granato, Rodrigo; Manne, Lakshmiprada; Tovar, Nick; Coelho, Paulo G

    2014-12-01

    Bone graft materials are utilized to stimulate healing of bone defects or enhance osseointegration of implants. In order to augment these capabilities, various surface modification techniques, including atmospheric pressure plasma (APP) surface treatment, have been developed. This in vivo study sought to assess the effect of APP surface treatment on degradation and osseointegration of Synthograft™, a beta-tricalcium phosphate (β-TCP) synthetic bone graft. The experimental (APP-treated) grafts were subjected to APP treatment with argon for a period of 60s. Physicochemical characterization was performed by environmental scanning electron microscopy, surface energy (SE), and x-ray photoelectron spectroscopy analyses both before and after APP treatment. Two APP-treated and two untreated grafts were surgically implanted into four critical-size calvarial defects in each of ten New Zealand white rabbits. The defect samples were explanted after four weeks, underwent histological analysis, and the percentages of bone, soft tissue, and remaining graft material were quantified by image thresholding. Material characterization showed no differences in particle surface morphology and that the APP-treated group presented significantly higher SE along with higher amounts of the base material chemical elements on it surface. Review of defect composition showed that APP treatment did not increase bone formation or reduce the amount of soft tissue filling the defect when compared to untreated material. Histologic cross-sections demonstrated osteoblastic cell lines, osteoid deposition, and neovascularization in both groups. Ultimately, argon-based APP treatment did not enhance the osseointegration or degradation of the β-TCP graft. Future investigations should evaluate the utility of gases other than argon to enhance osseointegration through APP treatment. Copyright © 2014 Elsevier B.V. All rights reserved.

  11. Outcomes of Prosthetic Hemodialysis Grafts after Deployment of Bare Metal versus Covered Stents at the Venous Anastomosis

    International Nuclear Information System (INIS)

    Kim, Charles Y.; Tandberg, Daniel J.; Rosenberg, Michael D.; Miller, Michael J.; Suhocki, Paul V.; Smith, Tony P.

    2012-01-01

    Purpose: To compare postintervention patency rates after deployment of bare metal versus covered stents across the venous anastomosis of prosthetic arteriovenous (AV) grafts. Methods: Review of our procedural database over a 6 year period revealed 377 procedures involving stent deployment in an AV access circuit. After applying strict inclusion criteria, our study group consisted of 61 stent deployments in 58 patients (median age 58 years, 25 men, 33 women) across the venous anastomosis of an upper extremity AV graft circuit that had never been previously stented. Both patent and thrombosed AV access circuits were retrospectively analyzed. Within the bare metal stent group, 20 of 32 AV grafts were thrombosed at initial presentation compared to 18 of 29 AV grafts in the covered stent group. Results: Thirty-two bare metal stents and 29 covered stents were deployed across the venous anastomosis. The 3, 6, and 12 months primary access patency rates for bare metal stents were not significantly different than for covered stents: 50, 41, and 22 % compared to 59, 52, and 29 %, respectively (p = 0.21). The secondary patency rates were also not significantly different: 78, 78, and 68 % for bare metal stents compared to 76, 69, and 61 % for covered stents, respectively (p = 0.85). However, covered stents demonstrated a higher primary stent patency rate than bare metal stents: 100, 85, and 70 % compared to 75, 67, and 49 % at 3, 6, and 12 months (p < 0.01). Conclusion: The primary and secondary access patency rates after deployment of bare metal versus covered stents at the venous anastomosis were not significantly different. However, bare metal stents developed in-stent stenoses significantly sooner.

  12. Results of Stent Graft Placement to Treat Cephalic Arch Stenosis in Hemodialysis Patients with Dysfunctional Brachiocephalic Arteriovenous Fistulas.

    Science.gov (United States)

    Jones, Robert G; Willis, Andrew P; Tullett, Karen; Riley, Peter L

    2017-10-01

    To determine effectiveness of the VIABAHN (W.L. Gore & Associates, Flagstaff, Arizona) stent graft to treat cephalic arch stenosis in patients with dysfunctional brachiocephalic arteriovenous fistulas after inadequate venoplasty response. Between 2012 and 2015, patients with failed venoplasty of symptomatic cephalic arch stenosis received a VIABAHN stent graft. Follow-up venography was performed at approximately 3, 6, and 12 months. Data were retrospectively analyzed with patency estimated using Kaplan-Meier and log-rank methodology. There were 39 patients included. Technical and clinical success was 100%. Primary target lesion patency was 85% (95% confidence interval [CI], 69%-93%), 67% (95% CI, 50%-80%), and 42% (95% CI, 25%-57%) at 3, 6, and 12 months. There was no significant difference in patency with regard to sex or age (P = .8 and P = .6, respectively). Primary assisted patency was 95% (95% CI, 82%-99%) at 3, 6, and 12 months. Access circuit primary patency was 85% (95% CI, 69%-93%), 67% (95% CI, 50%-80%), and 42% (95% CI, 25%-57%) at 3, 6, and 12 months. There was no significant difference in patency between patients with the stent graft as the first treatment episode in the cephalic arch and those that had previous intervention at this site (P = .98). There were 48 repeat venoplasty procedures performed in the cephalic arch to maintain patency, including 7 repeat VIABAHN insertions. No complications were encountered. The VIABAHN stent graft is a safe, effective, and durable device for treating cephalic arch stenosis when venoplasty fails. Crown Copyright © 2017. Published by Elsevier Inc. All rights reserved.

  13. Alveolar Ridge Preservation Using a Novel Synthetic Grafting Material: A Case with Two-Year Follow-Up

    Directory of Open Access Journals (Sweden)

    Peter Fairbairn

    2018-01-01

    Full Text Available This case report highlights the use of a novel in situ hardening synthetic (alloplastic, resorbable, bone grafting material composed of beta tricalcium phosphate and calcium sulfate, for alveolar ridge preservation. A 35-year-old female patient was referred by her general dentist for extraction of the mandibular right first molar and rehabilitation of the site with a dental implant. The nonrestorable tooth was “atraumatically” extracted without raising a flap, and the socket was immediately grafted with the synthetic biomaterial and covered with a hemostatic fleece. No membrane was used, and the site was left uncovered without obtaining primary closure, in order to heal by secondary intention. After 12 weeks, the architecture of the ridge was preserved, and clinical observation revealed excellent soft tissue healing without loss of attached gingiva. At reentry for placement of the implant, a bone core biopsy was obtained, and primary implant stability was measured by final seating torque and resonance frequency analysis. Histological analysis revealed pronounced bone regeneration while high levels of primary implant stability were recorded. The implant was successfully loaded 12 weeks after placement. Clinical and radiological follow-up examination at two years revealed stable and successful results regarding biological, functional, and esthetic parameters.

  14. Alveolar Ridge Preservation Using a Novel Synthetic Grafting Material: A Case with Two-Year Follow-Up.

    Science.gov (United States)

    Fairbairn, Peter; Leventis, Minas; Mangham, Chas; Horowitz, Robert

    2018-01-01

    This case report highlights the use of a novel in situ hardening synthetic (alloplastic), resorbable, bone grafting material composed of beta tricalcium phosphate and calcium sulfate, for alveolar ridge preservation. A 35-year-old female patient was referred by her general dentist for extraction of the mandibular right first molar and rehabilitation of the site with a dental implant. The nonrestorable tooth was "atraumatically" extracted without raising a flap, and the socket was immediately grafted with the synthetic biomaterial and covered with a hemostatic fleece. No membrane was used, and the site was left uncovered without obtaining primary closure, in order to heal by secondary intention. After 12 weeks, the architecture of the ridge was preserved, and clinical observation revealed excellent soft tissue healing without loss of attached gingiva. At reentry for placement of the implant, a bone core biopsy was obtained, and primary implant stability was measured by final seating torque and resonance frequency analysis. Histological analysis revealed pronounced bone regeneration while high levels of primary implant stability were recorded. The implant was successfully loaded 12 weeks after placement. Clinical and radiological follow-up examination at two years revealed stable and successful results regarding biological, functional, and esthetic parameters.

  15. Stent graft placement for dysfunctional arteriovenous grafts

    Energy Technology Data Exchange (ETDEWEB)

    Jeon, Gyeong Sik [Dept. of Radiology, CHA Bundang Medical Center, College of Medicine, CHA University, Seongnam (Korea, Republic of); Shin, Byung Seok; Ohm, Joon Young; Ahn, Moon Sang [Chungnam National University Hospital, Daejeon (Korea, Republic of)

    2015-07-15

    This study aimed to evaluate the usefulness and outcomes of stent graft use in dysfunctional arteriovenous grafts. Eleven patients who underwent stent graft placement for a dysfunctional hemodialysis graft were included in this retrospective study. Expanded polytetrafluoroethylene covered stent grafts were placed at the venous anastomosis site in case of pseudoaneurysm, venous laceration, elastic recoil or residual restenosis despite the repeated angioplasty. The patency of the arteriovenous graft was evaluated using Kaplan-Meier analysis. Primary and secondary mean patency was 363 days and 741 days. Primary patency at 3, 6, and 12 months was 82%, 73%, and 32%, respectively. Secondary patency at the 3, 6, 12, 24, and 36 months was improved to 91%, 82%, 82%, 50%, and 25%, respectively. Fractures of the stent graft were observed in 2 patients, but had no effect on the patency. Stent graft placement in dysfunctional arteriovenous graft is useful and effective in prolonging graft patency.

  16. Gene expression analysis of skin grafts and cultured keratinocytes using synthetic RNA normalization reveals insights into differentiation and growth control.

    Science.gov (United States)

    Katayama, Shintaro; Skoog, Tiina; Jouhilahti, Eeva-Mari; Siitonen, H Annika; Nuutila, Kristo; Tervaniemi, Mari H; Vuola, Jyrki; Johnsson, Anna; Lönnerberg, Peter; Linnarsson, Sten; Elomaa, Outi; Kankuri, Esko; Kere, Juha

    2015-06-25

    Keratinocytes (KCs) are the most frequent cells in the epidermis, and they are often isolated and cultured in vitro to study the molecular biology of the skin. Cultured primary cells and various immortalized cells have been frequently used as skin models but their comparability to intact skin has been questioned. Moreover, when analyzing KC transcriptomes, fluctuation of polyA+ RNA content during the KCs' lifecycle has been omitted. We performed STRT RNA sequencing on 10 ng samples of total RNA from three different sample types: i) epidermal tissue (split-thickness skin grafts), ii) cultured primary KCs, and iii) HaCaT cell line. We observed significant variation in cellular polyA+ RNA content between tissue and cell culture samples of KCs. The use of synthetic RNAs and SAMstrt in normalization enabled comparison of gene expression levels in the highly heterogenous samples and facilitated discovery of differences between the tissue samples and cultured cells. The transcriptome analysis sensitively revealed genes involved in KC differentiation in skin grafts and cell cycle regulation related genes in cultured KCs and emphasized the fluctuation of transcription factors and non-coding RNAs associated to sample types. The epidermal keratinocytes derived from tissue and cell culture samples showed highly different polyA+ RNA contents. The use of SAMstrt and synthetic RNA based normalization allowed the comparison between tissue and cell culture samples and thus proved to be valuable tools for RNA-seq analysis with translational approach. Transciptomics revealed clear difference both between tissue and cell culture samples and between primary KCs and immortalized HaCaT cells.

  17. Three-year results following regenerative periodontal surgery of advanced intrabony defects with enamel matrix derivative alone or combined with a synthetic bone graft.

    Science.gov (United States)

    Hoffmann, Thomas; Al-Machot, Elyan; Meyle, Jörg; Jervøe-Storm, Pia-Merete; Jepsen, Søren

    2016-03-01

    This study aims to compare the clinical outcomes of a combination of enamel matrix derivatives (EMD) and a synthetic bone graft (biphasic calcium phosphate) with EMD alone in wide and deep one- and two-wall intrabony defects 36 months after treatment. Thirty patients with chronic periodontitis and one wide (≥ 2 mm) and deep (≥ 4 mm) intrabony defect had been recruited in three centres in Germany. During surgery, defects were randomly assigned to EMD/synthetic bone graft (SBG) (test) or EMD (control). Assessments at baseline, after 6, 12 and 36 months, included bone sounding, relative clinical attachment levels, probing pocket depths and recessions. After 36 months, defects in both groups were significantly improved (p regenerative modalities could be maintained over a period of 3 years. The combination of EMD with SBG did not show any advantage compared to the use of EMD alone.

  18. The effect of patient age on bone formation using a fully synthetic nanocrystalline bone augmentation material in maxillary sinus grafting.

    Science.gov (United States)

    Wolf, Michael; Wurm, Alexander; Heinemann, Friedhelm; Gerber, Thomas; Reichert, Christoph; Jäger, Andreas; Götz, Werner

    2014-01-01

    Maxillary sinus floor augmentation is a treatment that has been proposed for patients in whom the alveolar bone height is insufficient. This procedure is commonly used in patients aged 40 to 70 years and older. However, little information exists whether the factor of age might influence the outcome of augmentation procedures. The aim of this study was to investigate whether the patient's age has an effect on bone formation and incorporation in maxillary sinus floor augmentation procedures. A fully synthetic nanocrystalline bone augmentation material (NanoBone, Artoss) was used for sinus floor augmentation in patients with a subantral vertical bone height of at least 3 mm and maximum of 7 mm. After 7 months healing time, biopsy specimens were taken and were divided into two groups according to the patient's age. Exclusion criteria were poor general health (eg, severe renal/and or liver disease), history of a radiotherapy in the head region, chemotherapy at the time of surgical procedure, noncompensated diabetes mellitus, symptoms of a maxillary sinus disease, active periodontal or systemic diseases, smoking, and poor oral hygiene. Histologic analyses with hematoxylin-eosin stain were performed. Multinucleated osteoclast-like cells were identified by histochemical staining (tartrate-resistant acid phosphatase [TRAP]). Quantitative and age-dependent assessment of bone formation, residual bone grafting material, and soft tissue formation following sinus augmentation was performed using histomorphometric analysis and the Bonferroni adjustment of the Student t test. Twenty biopsy specimens from 17 patients were taken and divided into two groups according to age (group 1: 41 to 52 years; group 2: 66 to 71 years) containing 10 specimens each, which were analyzed in triplicate resulting in a total of 30 specimens per group. A regeneration process with varying amounts of newly formed bone surrounded by marrow-like tissue was present in all augmented regions. No signs of

  19. Histologic Evaluation of Critical Size Defect Healing With Natural and Synthetic Bone Grafts in the Pigeon ( Columba livia ) Ulna.

    Science.gov (United States)

    Tunio, Ahmed; Jalila, Abu; Goh, Yong Meng; Shameha-Intan; Shanthi, Ganabadi

    2015-06-01

    Fracture and bone segment loss are major clinical problems in birds. Achieving bone formation and clinical union in a fracture case is important for the survival of the bird. To evaluate the efficacy of bone grafts for defect healing in birds, 2 different bone grafts were investigated in the healing of a bone defect in 24 healthy pigeons ( Columba livia ). In each bird, a 1-cm critical size defect (CSD) was created in the left ulna, and the fracture was stabilized with external skeletal fixation (ESF). A graft of hydroxyapatite (HA) alone (n = 12 birds) or demineralized bone matrix (DBM) combined with HA (n = 12 birds) was implanted in the CSD. The CSD healing was evaluated at 3 endpoints: 3, 6, and 12 weeks after surgery. Four birds were euthanatized at each endpoint from each treatment group, and bone graft healing in the ulna CSD was evaluated by histologic examination. The CSD and graft implants were evaluated for quality of union, cortex development, and bone graft incorporation. Results showed no graft rejection in any bird, and all birds had connective tissue formation in the defect because of the bone graft application. These results suggest that bone defect healing can be achieved by a combination of osteoinductive and osteoconductive bone graft materials for clinical union and new bone regeneration in birds. The combination of DBM and HA resulted in a better quality bone graft (P < .05) than did HA alone, but there was no significant differences in cortex development or bone graft incorporation at 3, 6, or 12 weeks. From the results of this study, we conclude that HA bone grafts, alone or in combination with DBM, with external skeletal fixation is suitable and safe for bone defect and fracture treatment in pigeons.

  20. Home hemodialysis

    DEFF Research Database (Denmark)

    Agar, John W; Perkins, Anthony; Heaf, James G

    2015-01-01

    We describe the infrastructure that is necessary for hemodialysis in the home focusing on physical requirements, the organization of plumbing and water, and the key features that should guide the selection of machines that are suitable for home use.......We describe the infrastructure that is necessary for hemodialysis in the home focusing on physical requirements, the organization of plumbing and water, and the key features that should guide the selection of machines that are suitable for home use....

  1. Synthetic

    Directory of Open Access Journals (Sweden)

    Anna Maria Manferdini

    2010-06-01

    Full Text Available Traditionally materials have been associated with a series of physical properties that can be used as inputs to production and manufacturing. Recently we witnessed an interest in materials considered not only as ‘true matter’, but also as new breeds where geometry, texture, tooling and finish are able to provoke new sensations when they are applied to a substance. These artificial materials can be described as synthetic because they are the outcome of various qualities that are not necessarily true to the original matter, but they are the combination of two or more parts, whether by design or by natural processes. The aim of this paper is to investigate the potential of architectural surfaces to produce effects through the invention of new breeds of artificial matter, using micro-scale details derived from Nature as an inspiration.

  2. Comparing frozen saphenous vein with Gore-tex in vascular access for chronic hemodialysis.

    Science.gov (United States)

    Mousavi, Seyed Reza; Moatamedi, Mohammad Reza Kalantar; Me Akbari, Mohamad

    2011-10-01

    Performing chronic hemodialysis in patients suffering from end-stage renal disease needs a suitable vascular access like arteriovenous fistula in the upper limbs and bridge fistula in the upper or lower limbs, and also use of permanent and temporary catheters. The purpose of this study is to compare frozen saphenous vein versus using synthetic Gore-tex vascular graft for A-V fistula. In the prospective randomized study, 70 patients needing for dialysis access were randomly divided into two groups. We performed the frozen saphenous vein A-V fistula in the test group and the Gore-tex fistula in the control group. An assessment included function criteria (fistula thrill and murmur) and complications (infection and thrombosis) in planned intervals. At the end of the follow-up period, the flow rates of all fistulas were assessed by Doppler sonography. The data were compared. Comparing the function criteria (fistula murmur and thrill) and the flow rate of the test group (frozen saphenous A-V fistula) and the control group (Gore-tex method) showed no significant difference and also no significant difference between two groups in thrombosis. Infection rate of the Gore-tex method was significantly high (p Gore-tex arteriovenous graft in some aspects. © 2011 The Authors; Hemodialysis International © 2011 International Society for Hemodialysis.

  3. Injectable synthetic bone graft substitute combined with core decompression in the treatment of advanced osteonecrosis of the femoral head: A 5-year follow-up.

    Science.gov (United States)

    Yu, Pei-An; Peng, Kuo-Ti; Huang, Tsan-Weng; Hsu, Robert Wen-Wei; Hsu, Wei-Hsiu; Lee, Mel S

    2015-01-01

    Osteonecrosis of the femoral head can lead to destruction of the hip joint and disabling arthritis in young adults, if left untreated. Among the salvage procedures, core decompression combined with bone graft substitutes is a viable option for joint preservation. The purpose of this study was to review the outcomes of using synthetic bone graft substitute (calcium sulfate and calcium phosphate) for the treatment of late-stage osteonecrosis of the femoral head. From November 2008 to May 2009, 19 hips in 18 patients with osteonecrosis of the femoral head [6 hips in Association Research Circulation Osseous (ARCO) stage IIC and 13 hips in stage IIIA] were treated with core decompression combined with PRO-DENSE™ (Injectable Regenerative Graft). The average age of the patients at the time of surgery was 48 years (range 25-67 years). Twelve patients (13 hips) overused alcohol, four patients (4 hips) were idiopathic, one patient (1 hip) used corticosteroids, and one patient (1 hip) was post-traumatic. The clinical failure was defined as conversion to total hip arthroplasty or progression in head collapse. At the conclusion of the study, 3 in the 6 stage IIC hips and 8 in the 13 stage IIIA hips were converted to total hip arthroplasty in an average of 8.5 months (range 4-30 months) postoperatively. Advanced collapse of the femoral head awaiting for total hip arthroplasty was observed in the other six hips. Of the 19 hips, only 2 hips (10.5%) survived without further collapse in the 5-year follow-up. This resulted in 89.5% failure rate with early resorption of the grafting in an average of 5.3 months. Core decompression combined with an injectable calcium sulfate and calcium phosphate composite graft (PRO-DENSE) were associated high failure rates in the early postoperative period. It is not recommended for the treatment of ARCO stage IIC and IIIA osteonecrosis of the femoral head.

  4. Indium-111-labeled leukocyte scan in detection of synthetic vascular graft infection: The effect of antibiotic treatment

    International Nuclear Information System (INIS)

    Chung, C.J.; Hicklin, O.A.; Payan, J.M.; Gordon, L.

    1991-01-01

    To determine the sensitivity and specificity of the indium-111-( 111 In) labeled leukocyte scan for prosthetic vascular graft infection in patients treated with antibiotic therapy, a retrospective study was performed. Of 41 consecutive 111 In-labeled leukocyte scans performed to evaluate possible vascular graft infection, 23 scans were performed in patients treated with antibiotics. The average duration of antibiotic therapy was 21 days. Twelve positive and 11 negative scans for graft infection were found. By surgical and autopsy correlation of all positive cases, and clinical correlation (of all negative cases), there were 10 true-positive, 11 true-negative, 2 false-positive, and no false-negative scans for graft infections, for an overall sensitivity of 100% and specificity of 85%

  5. Novel therapies for hemodialysis vascular access dysfunction: fact or fiction!

    Science.gov (United States)

    Roy-Chaudhury, Prabir; Kelly, Burnett S; Melhem, Murad; Zhang, Jianhua; Li, Jinsong; Desai, Pankaj; Munda, Rino; Heffelfinger, Sue C

    2005-01-01

    Hemodialysis vascular access dysfunction is a major cause of morbidity in the hemodialysis population and contributes significantly to the overall cost of end-stage renal disease programs. At a histological level, most hemodialysis vascular access dysfunction (in both native arteriovenous fistulae and PTFE dialysis access grafts) is due to venous stenosis and thrombosis, secondary to venous neointimal hyperplasia. However, despite a wealth of experimental and clinical data on the use of novel therapeutic interventions that target neointimal hyperplasia in the setting of coronary artery disease, there are unfortunately no effective therapeutic interventions for hemodialysis vascular access dysfunction at the present time. This is particularly unfortunate, since neointimal hyperplasia in the setting of hemodialysis vascular access fistulae and grafts could be the ideal clinical model to test novel therapeutic interventions for neointimal hyperplasia. Copyright 2005 S. Karger AG, Basel.

  6. Osteomyelitis of the First Metatarsal Head Treated With Joint-Preserving Surgery and a Synthetic Resorbable Bone Graft Substitute: A Case Report.

    Science.gov (United States)

    Anagnostakos, Konstantinos; Koch, Katrin

    2018-04-11

    Managing infections of the first metatarsophalangeal joint can be demanding because many patients present with late-stage infection and partial or total amputation of the first ray or the phalanx could be necessary. We describe such a patient who was successfully treated with a calcium-based resorbable bone substitute that preserved the first metatarsophalangeal joint. A 38-year-old female presented to our department with a foot infection. Examination revealed a methicillin-susceptible Staphylococcus aureus infection of the first metatarsophalangeal joint. The histopathologic findings confirmed active osteomyelitis of the first metatarsal head. The metatarsophalangeal joint was debrided with open synovectomy, the metatarsal head was curetted, and the bone defect was filled with 2 mL of a synthetic bone graft substitute. Two years later, she reported no problems with function or pain, the joint had full range of motion, and she had no local or systemic signs of infection. The most recent radiographs revealed no damage to the first metatarsophalangeal joint. A synthetic bone graft substitute can be a good alternative for treating forefoot infections when the soft tissues are intact and the bone defect is not so large that partial or full amputation is necessary. Copyright © 2017 The American College of Foot and Ankle Surgeons. Published by Elsevier Inc. All rights reserved.

  7. Core Decompression with Synthetic Grafting as a Joint Preservation Strategy in Humeral Avascular Necrosis Due to Sickle Cell Anemia: A Case Report.

    Science.gov (United States)

    Steffensmeier, Andrew M; Kirkham, Karen; Wiemann, John M

    2016-01-01

    Avascular necrosis (AVN) of the femoral or humeral heads in patients with sickle cell anemia is a common and painful condition. There is currently no gold standard treatment protocol for this condition. Typically, the pain is managed with narcotics and activity restriction until there has been collapse of the subchondral bone with a degree of arthrosis sufficient to warrant total joint arthroplasty. This method entails prolonged pain for the patient and decreases the ability to function occupationally and recreationally. A 51-year-old African-American woman with a history of sickle cell anemia presented for the evaluation of significant bilateral shoulder pain that was confirmed to be AVN via radiographs and magnetic resonance imaging of both her humeral heads without joint collapse. She tried and failed conservative management with physical therapy and optimization of sickle cell treatment with pain medications for years, so she desired surgical management. Arthroscopically assisted core decompression of her humeral heads with synthetic grafting was performed in an attempt at joint preservation. This report demonstrates a technique of staged decompression of necrotic bone in the bilateral humeral heads with synthetic bone grafting to determine if this could function as a joint preservation strategy. This procedure was considered successful to alleviate the patients' pain in both of her arms. The application of this procedure is significant because it could be used in various future medical joint preservation cases for a wide range of patients.

  8. Association Between Prior Peripherally Inserted Central Catheters and Lack of Functioning Arteriovenous Fistulas: A Case-Control Study in Hemodialysis Patients

    Science.gov (United States)

    Ters, Mireille El; Schears, Gregory J.; Taler, Sandra J.; Williams, Amy W.; Albright, Robert C.; Jenson, Bernice M.; Mahon, Amy L.; Stockland, Andrew H.; Misra, Sanjay; Nyberg, Scott L.; Rule, Andrew D.; Hogan, Marie C.

    2013-01-01

    Background Although an arteriovenous fistula (AVF) is the hemodialysis access of choice, its prevalence continues to be lower than recommended in the United States. We assessed the association between past peripherally inserted central catheters (PICCs) and lack of functioning AVFs. Study Design Case-control study. Participants & Setting Prevalent hemodialysis population in 7 Mayo Clinic outpatient hemodialysis units. Cases were without functioning AVFs and controls were with functioning AVFs on January 31, 2011. Predictors History of PICCs. Outcomes Lack of functioning AVFs. Results On January 31, 2011, a total of 425 patients were receiving maintenance hemodialysis, of whom 282 were included in this study. Of these, 120 (42.5%; cases) were dialyzing through a tunneled dialysis catheter or synthetic arteriovenous graft and 162 (57.5%; controls) had a functioning AVF. PICC use was evaluated in both groups and identified in 30% of hemodialysis patients, with 54% of these placed after dialysis therapy initiation. Cases were more likely to be women (52.5% vs 33.3% in the control group; P = 0.001), with smaller mean vein (4.9 vs 5.8 mm; P PICC was identified in 53 (44.2%) cases, but only 32 (19.7%) controls (P PICC use and lack of a functioning AVF (OR, 3.2; 95% CI, 1.9–5.5; P PICCs are commonly placed in patients with end-stage renal disease and are a strong independent risk factor for lack of functioning AVFs. PMID:22704142

  9. Immunological challenges associated with artificial skin grafts: available solutions and stem cells in future design of synthetic skin.

    Science.gov (United States)

    Dixit, Saurabh; Baganizi, Dieudonné R; Sahu, Rajnish; Dosunmu, Ejowke; Chaudhari, Atul; Vig, Komal; Pillai, Shreekumar R; Singh, Shree R; Dennis, Vida A

    2017-01-01

    The repair or replacement of damaged skins is still an important, challenging public health problem. Immune acceptance and long-term survival of skin grafts represent the major problem to overcome in grafting given that in most situations autografts cannot be used. The emergence of artificial skin substitutes provides alternative treatment with the capacity to reduce the dependency on the increasing demand of cadaver skin grafts. Over the years, considerable research efforts have focused on strategies for skin repair or permanent skin graft transplantations. Available skin substitutes include pre- or post-transplantation treatments of donor cells, stem cell-based therapies, and skin equivalents composed of bio-engineered acellular or cellular skin substitutes. However, skin substitutes are still prone to immunological rejection, and as such, there is currently no skin substitute available to overcome this phenomenon. This review focuses on the mechanisms of skin rejection and tolerance induction and outlines in detail current available strategies and alternatives that may allow achieving full-thickness skin replacement and repair.

  10. Early in-situ cellularization of a supramolecular vascular graft is modified by synthetic stromal cell-derived factor-1α derived peptides.

    Science.gov (United States)

    Muylaert, Dimitri E P; van Almen, Geert C; Talacua, Hanna; Fledderus, Joost O; Kluin, Jolanda; Hendrikse, Simone I S; van Dongen, Joost L J; Sijbesma, Eline; Bosman, Anton W; Mes, Tristan; Thakkar, Shraddha H; Smits, Anthal I P M; Bouten, Carlijn V C; Dankers, Patricia Y W; Verhaar, Marianne C

    2016-01-01

    In an in-situ approach towards tissue engineered cardiovascular replacement grafts, cell-free scaffolds are implanted that engage in endogenous tissue formation. Bioactive molecules can be incorporated into such grafts to facilitate cellular recruitment. Stromal cell derived factor 1α (SDF1α) is a powerful chemoattractant of lymphocytes, monocytes and progenitor cells and plays an important role in cellular signaling and tissue repair. Short SDF1α-peptides derived from its receptor-activating domain are capable of activating the SDF1α-specific receptor CXCR4. Here, we show that SDF1α-derived peptides can be chemically modified with a supramolecular four-fold hydrogen bonding ureido-pyrimidinone (UPy) moiety, that allows for the convenient incorporation of the UPy-SDF1α-derived peptides into a UPy-modified polymer scaffold. We hypothesized that a UPy-modified material bioactivated with these UPy-SDF1α-derived peptides can retain and stimulate circulating cells in an anti-inflammatory, pro-tissue formation signaling environment. First, the early recruitment of human peripheral blood mononuclear cells to the scaffolds was analyzed in vitro in a custom-made mesofluidic device applying physiological pulsatile fluid flow. Preferential adhesion of lymphocytes with reduced expression of inflammatory factors TNFα, MCP1 and lymphocyte activation marker CD25 was found in the bioactivated scaffolds, indicating a reduction in inflammatory signaling. As a proof of concept, in-vivo implantation of the bioactivated scaffolds as rat abdominal aorta interposition grafts showed increased cellularity by CD68+ cells after 7 days. These results indicate that a completely synthetic, cell-free biomaterial can attract and stimulate specific leukocyte populations through supramolecular incorporation of short bioactive SDF1α derived peptides. Copyright © 2015 Elsevier Ltd. All rights reserved.

  11. Comparison of in vitro and in vivo bioactivity: cuttlefish-bone-derived hydroxyapatite and synthetic hydroxyapatite granules as a bone graft substitute.

    Science.gov (United States)

    Kim, Beom-Su; Kang, Hyo Jin; Yang, Sun-Sik; Lee, Jun

    2014-04-01

    Bone reconstruction in clinical settings often requires bone substitutes. Hydroxyapatite (HAp) is a widely used bone substitute due to its osteoconductive properties and bone bonding ability. The aim of this study was to evaluate HAp granules derived from cuttlefish bone (CB-HAp) as a substitute biomaterial for bone grafts. In this study, HAp granules were prepared from raw CB by using a hydrothermal reaction. The formation of HAp from CB was confirmed by scanning electron microscopy and x-ray diffraction analysis. The bioactivity of the CB-HAp granules was evaluated both in vitro and in vivo. Our results show that CB-HAp is non-toxic and that CB-HAp granules supported improved cell adhesion, proliferation and differentiation compared to stoichiometric synthetic HAp granules. Furthermore, in vivo bone defect healing experiments show that the formation of bone with CB-HAp is higher than that with pure HAp. These results show that CB-HAp granules have excellent potential for use as a bone graft material.

  12. Osseointegration of dental implants in 3D-printed synthetic onlay grafts customized according to bone metabolic activity in recipient site.

    Science.gov (United States)

    Tamimi, Faleh; Torres, Jesus; Al-Abedalla, Khadijeh; Lopez-Cabarcos, Enrique; Alkhraisat, Mohammad H; Bassett, David C; Gbureck, Uwe; Barralet, Jake E

    2014-07-01

    Onlay grafts made of monolithic microporous monetite bioresorbable bioceramics have the capacity to conduct bone augmentation. However, there is heterogeneity in the graft behaviour in vivo that seems to correlate with the host anatomy. In this study, we sought to investigate the metabolic activity of the regenerated bone in monolithic monetite onlays by using positron emission tomography-computed tomography (PET-CT) in rats. This information was used to optimize the design of monetite onlays with different macroporous architecture that were then fabricated using a 3D-printing technique. In vivo, bone augmentation was attempted with these customized onlays in rabbits. PET-CT findings demonstrated that bone metabolism in the calvarial bone showed higher activity in the inferior and lateral areas of the onlays. Histological observations revealed higher bone volume (up to 47%), less heterogeneity and more implant osseointegration (up to 38%) in the augmented bone with the customized monetite onlays. Our results demonstrated for the first time that it is possible to achieve osseointegration of dental implants in bone augmented with 3D-printed synthetic onlays. It was also observed that designing the macropore geometry according to the bone metabolic activity was a key parameter in increasing the volume of bone augmented within monetite onlays. Copyright © 2014 Elsevier Ltd. All rights reserved.

  13. Sequential Use of Hyperbaric Oxygen, Synthetic Skin Substitute and Skin Grafting in the Treatment of a Refractory Vasculitic Ulcer.

    Science.gov (United States)

    Akcali, Gökhan; Uzun, Günalp; Yapici, Abdül Kerim; Yildiz, Şenol

    2013-12-01

    Cutaneous leukocytoclastic vasculitis (CLCV) is a disorder characterized by the inflammation of the small vessels of the skin. CLCV may cause recurrent, drug-resistant, non-healing ulcers. Herein, we present a patient with a recalcitrant ulcer caused by CLCV, who was successfully treated with hyperbaric oxygen therapy and skin grafting. There is not any particular therapy/product that will heal all type of wounds. We can achieve better results provided that wound care products and advanced treatments are used at the right time.

  14. Equilibrium shift in solution: molecular shape recognition and precipitation of a synthetic double helix using helicene-grafted silica nanoparticles.

    Science.gov (United States)

    Miyagawa, Masamichi; Ichinose, Wataru; Yamaguchi, Masahiko

    2014-01-27

    Chiral silica nanoparticles (70 nm) grafted with (P)-helicene recognized the molecular shape of double helix and random coil (P)-ethynylhelicene oligomers in solution. A mixture of the (P)-nanoparticles and double helix precipitated much faster than a mixture of the (P)-nanoparticles and random coil, and the precipitate contained only the double helix. The mixture of the (P)-nanoparticles and (P)-ethynylhelicene pentamer reversibly dispersed in trifluoromethylbenzene upon heating at 70 °C and precipitated upon cooling at 25 °C. When a 10:90 equilibrium mixture of the double helix and random coil in solution was treated with the (P)-nanoparticles, the double helix was precipitated in 53% yield and was accompanied by equilibrium shift. Copyright © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  15. Change in Vascular Access and Hospitalization Risk in Long-Term Hemodialysis Patients

    OpenAIRE

    Lacson, Eduardo; Wang, Weiling; Lazarus, J. Michael; Hakim, Raymond M.

    2010-01-01

    Background and objectives: Conversion from central venous catheters to a graft or a fistula is associated with lower mortality risk in long-term hemodialysis (HD) patients; however, a similar association with hospitalization risk remains to be elucidated.

  16. Engineered vascularized bone grafts

    OpenAIRE

    Tsigkou, Olga; Pomerantseva, Irina; Spencer, Joel A.; Redondo, Patricia A.; Hart, Alison R.; O’Doherty, Elisabeth; Lin, Yunfeng; Friedrich, Claudia C.; Daheron, Laurence; Lin, Charles P.; Sundback, Cathryn A.; Vacanti, Joseph P.; Neville, Craig

    2010-01-01

    Clinical protocols utilize bone marrow to seed synthetic and decellularized allogeneic bone grafts for enhancement of scaffold remodeling and fusion. Marrow-derived cytokines induce host neovascularization at the graft surface, but hypoxic conditions cause cell death at the core. Addition of cellular components that generate an extensive primitive plexus-like vascular network that would perfuse the entire scaffold upon anastomosis could potentially yield significantly higher-quality grafts. W...

  17. Standardized Definitions for Hemodialysis Vascular Access

    OpenAIRE

    Lee, Timmy; Mokrzycki, Michele; Moist, Louise; Maya, Ivan; Vazquez, Miguel; Lok, Charmaine

    2011-01-01

    Vascular access dysfunction is one of the leading causes of morbidity and mortality among end-stage renal disease patients 1,2. Vascular access dysfunction exists in all 3 types of available accesses: arteriovenous fistulas, arteriovenous grafts, and tunneled catheters. In order to improve clinical research and outcomes in hemodialysis access dysfunction, the development of a multidisciplinary network of collaborative investigators with various areas of expertise, and common standards for ter...

  18. Addition of a Synthetically Fabricated Osteoinductive Biphasic Calcium Phosphate Bone Graft to BMP2 Improves New Bone Formation.

    Science.gov (United States)

    Zhang, Yufeng; Yang, Shuang; Zhou, Wei; Fu, Hang; Qian, Li; Miron, Richard J

    2016-12-01

    time was observed for collagen scaffolds up to 14 days. The osteoinductive properties of BMP2 may further be enhanced by its combination with a novel synthetically fabricated osteoinductive BCP scaffold. Future clinical testing is required to further assess these preliminary findings. © 2015 Wiley Periodicals, Inc.

  19. Early in-situ cellularization of a supramolecular vascular graft is modified by synthetic stromal cell-derived factor-1α derived peptides

    NARCIS (Netherlands)

    Muylaert, Dimitri E. P.; van Almen, Geert C.; Talacua, Hanna; Fledderus, Joost O.; Kluin, Jolanda; Hendrikse, Simone I. S.; van Dongen, Joost L. J.; Sijbesma, Eline; Bosman, Anton W.; Mes, Tristan; Thakkar, Shraddha H.; Smits, Anthal I. P. M.; Bouten, Carlijn V. C.; Dankers, Patricia Y. W.; Verhaar, Marianne C.

    2016-01-01

    In an in-situ approach towards tissue engineered cardiovascular replacement grafts, cell-free scaffolds are implanted that engage in endogenous tissue formation. Bioactive molecules can be incorporated into such grafts to facilitate cellular recruitment. Stromal cell derived factor 1α (SDF1α) is a

  20. Early in-situ cellularization of a supramolecular vascular graft is modified by synthetic stromal cell-derived factor-1α derived peptides

    NARCIS (Netherlands)

    Muylaert, Dimitri E P; van Almen, Geert C; Talacua, Hanna; Fledderus, Joost O; Kluin, Jolanda; Hendrikse, Simone I S; van Dongen, Joost L J; Sijbesma, Eline; Bosman, Anton W; Mes, Tristan; Thakkar, Shraddha H; Smits, Anthal I P M; Bouten, Carlijn V C; Dankers, Patricia Y W; Verhaar, Marianne C

    In an in-situ approach towards tissue engineered cardiovascular replacement grafts, cell-free scaffolds are implanted that engage in endogenous tissue formation. Bioactive molecules can be incorporated into such grafts to facilitate cellular recruitment. Stromal cell derived factor 1α (SDF1α) is a

  1. Treatment Methods for Kidney Failure: Hemodialysis

    Science.gov (United States)

    ... Choosing a Treatment Treatment Options - Comparison Chart Hemodialysis Hemodialysis Dose & Adequacy Eating & Nutrition for Hemodialysis Peritoneal Dialysis Peritoneal Dialysis: Dose & Adequacy ...

  2. Hemodialysis membranes for acute and chronic renal insufficiency.

    Science.gov (United States)

    Yu, Jin-Gang; Yu, Lin-Yan; Jiang, Xin-Yu; Chen, Xiao-Qing; Tao, Li-Jian; Jiao, Fei-Peng

    2013-08-01

    As an incomplete renal replacement for the patients with either acute or chronic renal failure, membrane-based hemodialysis therapy is progressing rapidly. However, the mortality and morbidity remain unacceptably high. Much effort has been put into improving the biocompatibility of the hemodialysis membranes. To effectively remove small solutes and 'middle molecules' in compact cartridges, the hydraulic and permselective properties of the hemodialysis membranes have also been deeply investigated. An overview of recent progress of different kinds of hemodialysis membranes and their preparation technology, as well as their modification techniques, is presented. The advantages and deficiencies of many synthetic membranes, including cellulose, cellulose acetate (CA), chitosan (CS), polysulfone (PS), poly(ether sulfone) (PES), polyacrylonitrile (PAN), ethylene-vinyl alcohol copolymer (EVOH), poly (methyl methacrylate) (PMMA) and poly(vinyl alcohol) (PVA), etc. are elaborated upon.

  3. Hemodialysis access -- self care

    Science.gov (United States)

    ... hemodialysis. Taking good care of your access helps make it last longer. Prevent Infection in Your Access Keep your access clean. Wash the access with soap and water every day to decrease your risk ...

  4. Particle size of bone graft and method of impaction affect initial stability of cemented cups: human cadaveric and synthetic pelvic specimen studies.

    NARCIS (Netherlands)

    Bolder, S.B.T.; Schreurs, B.W.; Verdonschot, N.J.J.; Unen, J. van; Gardeniers, J.W.M.; Slooff, T.J.J.H.

    2003-01-01

    We determined the effect of bone graft particle size and impaction technique on the initial stability of cemented acetabular cups. First, acetabular reconstructions were performed in human cadaveric pelvic bones in which type 2 AAOS cavitary defects were created. Reconstructions were made with small

  5. Recurrent white thrombi formation in hemodialysis tubing: a case report.

    Science.gov (United States)

    Sathe, Kiran P; Yeo, Wee-Song; Liu, Isaac Desheng; Ekambaram, Sudha; Azar, Mohammed; Yap, Hui-Kim; Ng, Kar-Hui

    2015-01-15

    While the appearance of red clots in the dialyzer is a common phenomenon in every hemodialysis unit, the occurrence of white thrombi in the tubing is relatively rare. We describe an adolescent male with recurrent white thrombi formation in the hemodialysis tubing. This patient had chronic renal failure from focal segmental glomerulosclerosis, but was no longer nephrotic at the time of the thrombi formation. He had a history of recurrent thrombosis of his vascular access. However, no pro-thrombotic risk factors could be identified. White particulate matter, measuring 1 to 3mm in size, and adherent to the arterial and venous blood tubing lines was found during the rinse back of a hemodialysis session. This was associated with a 60% decrease in his platelet count. Light microscopic examination of the deposits revealed the presence of platelet aggregates. He subsequently developed thrombosis of his arteriovenous graft six hours later. The white thrombi recurred at the next dialysis session, as well as six months later. These episodes occurred regardless of the type of dialysis machine or tubing, and appeared to resolve with an increase in heparin dose. Recurrent white thrombi formation can occur in the hemodialysis tubing of a patient with no identifiable pro-thrombotic factors. The white thrombi may be a harbinger of arteriovenous graft thrombosis and may be prevented by an increase in heparin dose.

  6. Medial support by fibula bone graft in angular stable plate fixation of proximal humeral fractures: an in vitro study with synthetic bone.

    Science.gov (United States)

    Osterhoff, Georg; Baumgartner, Daniel; Favre, Philippe; Wanner, Guido A; Gerber, Hans; Simmen, Hans-Peter; Werner, Clément M L

    2011-07-01

    Failure to achieve stable fixation with medial support in proximal humeral fractures can result in varus malalignment and cut-through of the proximal screws. The purpose of this study was to investigate the influence of an intramedullary fibula bone graft on the biomechanical properties of proximal humeral fractures stabilized by angular stable plate fixation in a bone model under cyclic loading. Two fixation techniques were tested in 20 composite analog humeri models. In group F- (n = 10), fractures were fixed by an anatomically formed locking plate system. In group F+ (n = 10), the same fixation system was used with an additional fibular graft model with a length of 6 cm inserted in an intramedullary manner. Active abduction was simulated for 400 cycles by use of a recently established testing setup. Fragment gap distance was measured, and thereby, intercyclic motion, fragment migration, and residual plastic deformation were determined. The addition of a fibular graft to the fixation plate led to 5 times lower intercyclic motion, 2 times lower fragment migration, and 2 times less residual plastic deformation. Neither screw pullout, cut-through, nor implant failure was observed. Medial support with an intramedullary fibular graft in an angular stable fixation of the proximal humerus in vitro increases overall stiffness of the bone-implant construct and reduces migration of the humeral head fragment. This technique might provide a useful tool in the treatment of displaced proximal humeral fractures, especially when there is medial comminution. Copyright © 2011 Journal of Shoulder and Elbow Surgery Board of Trustees. Published by Mosby, Inc. All rights reserved.

  7. Biochemical changes on the repair of surgical bone defects grafted with biphasic synthetic micro-granular HA + β-tricalcium phosphate induced by laser and LED phototherapies assessed by Raman spectroscopy

    Science.gov (United States)

    Pinheiro, Antonio Luiz B.; Soares, Luiz Guilherme P.; Marques, Aparecida Maria C.; Silveira, Landulfo

    2016-03-01

    This work aimed the assessment of the biochemical changes during bone mineralization induced by laser and LED irradiation in an animal model of bone repair using a spectral model based on Raman spectroscopy. Six groups were studied: Clot, Laser (λ780 nm, 70 mW), LED (λ850 nm +/- 10 nm, 150 mW), Biomaterial (biphasic synthetic microgranular hydroxyapatite (HA) + β-tricalcium phosphate), Laser + Biomaterial and LED + Biomaterial. When indicated, defects were further irradiated at 48 h interval during 2 wks, 20 J/cm2 per session. At 15th and 30th days, femurs were dissected and spectra of the defects were collected. Raman spectra were submitted to a model to estimate the relative amount of collagen, phosphate HA and carbonate HA, by using spectra of pure collagen, biomaterial and basal bone, respectively. At 15th days, the use of biomaterial associated to phototherapy reduced the collagen formation, whereas the amount of carbonate HA was not different in all groups. The phosphate HA was higher in the groups that received biomaterial grafts. At 30th days, it was observed an increase of collagen for the group Laser + Biomaterial, and a reduction in the carbonate HA for the LED + Biomaterial. The phosphate HA was higher for the groups LED + Biomaterial and Laser + Biomaterial, while decreased for the group Biomaterial. These results indicated that the use of Laser and LED phototherapies improved the repair of bone defects grafted with the biomaterial by increasing the collagen deposition and phosphate HA.

  8. Hemodialysis removal of norfloxacin.

    Science.gov (United States)

    Lau, A H; Tang, I; Fitzloff, J; Jain, R

    1994-01-01

    The effect of hemodialysis on norfloxacin removal was evaluated in 7 patients. Single 800-mg doses of the drug were given to the subjects prior to dialysis using cuprophan hollow fiber dialyzers. Arterial and venous sample pairs were obtained at hourly intervals during treatment. Norfloxacin plasma concentrations were determined by HPLC. The mean hemodialysis clearance and extraction ratio were 38.84 +/- 10.92 ml/min and 0.19 +/- 0.06, respectively. Small differences in these parameters were observed between dialyzers with different surface areas (p > 0.05) and also between treatments using different blood flow rates (p > 0.05). Since a relatively small amount of norfloxacin is removed by hemodialysis, dosage adjustment is not necessary to compensate for the extracorporeal removal.

  9. Sulfonated hydrocarbon graft architectures for cation exchange membranes

    DEFF Research Database (Denmark)

    Nielsen, Mads Møller; Jankova Atanasova, Katja; Hvilsted, Søren

    2013-01-01

    A synthetic strategy to hydrocarbon graft architectures prepared from a commercial polysulfone and aimed as ion exchange membrane material is proposed. Polystyrene is grafted from a polysulfone macroinitiator by atom transfer radical polymerization, and subsequently sulfonated with acetyl sulfate...

  10. Patency rates and complications of Exxcel yarn-wrapped polytetrafluoroethylene grafts versus Gore-tex stretch polytetrafluoroethylene grafts: a prospective study.

    Science.gov (United States)

    Ko, Po-Jen; Hsieh, Hung-Chang; Chu, Jaw-Ji; Lin, Pyng Jing; Liu, Yun-Hen

    2004-01-01

    Polytetrafluoroethylene (PTFE) has long been used for hemodialysis access when there is no suitable superficial vein. We conducted a prospective randomized study to compare two PTFE grafts; the stretch Gore-tex graft and the Exxcel graft. Between May 2000 and February 2001, PTFE grafts were implanted for hemodialysis access in the upper extremities of 94 consecutive patients with end-stage renal disease. Graft selection was randomized, with patients receiving either a Gore-tex or an Exxcel graft. All grafts were monitored for signs of thrombosis or other complications. Graft survival was analyzed using a life-table analysis and the log-rank test was applied to compare graft patency. The primary patency rates 1 and 2 years after implantation were 51% and 36% for the Exxcel grafts, and 71% and 45% for the Gore-tex grafts, respectively. The difference between the two groups was not significant at any time. The incidence of complications needing further surgical management was 8.2% in the Exxcel group and 6.7% in the Gore-tex group, without a significant difference. Exxcel grafts or Gore-tex stretch grafts can be used for dialysis access with similar expected outcomes for up to 2 years, despite the differences in their outer surface design. The yarn-wrapped design does not appear to enhance the graft patency and we found no remarkable difference.

  11. Future of home hemodialysis.

    Science.gov (United States)

    Friedman, E A

    1977-01-01

    An attempt to prophesy the future of home hemodialysis is based on anticipated near and long term technological improvements. Dialysis treatments will become shorter, due to pressure filtration, while extracting molecules in the 300 to 3000 dalton weight range through more permeable membranes. Portable and wearable dialysis systems will increase patient mobility. By the 21st century, implantable bionic kidneys and perfect host tolerance to renal allografts and xenografts will relegate home hemodialysis to history texts. A non-surgical definitive treatment for uremia is envisioned in the colonization of the human bowel with nitrogenn recycling bacteria.

  12. Aberrant soluble epoxide hydrolase and oxylipin levels in a porcine arteriovenous graft stenosis model.

    Science.gov (United States)

    Terry, Christi M; Carlson, Mary L; He, Yuxia; Ulu, Arzu; Morisseau, Christophe; Blumenthal, Donald K; Hammock, Bruce D; Cheung, Alfred K

    2014-01-01

    Synthetic arteriovenous grafts (AVGs) used for hemodialysis frequently fail due to the development of neointimal hyperplasia (NH) at the vein-graft anastomosis. Inflammation and smooth-muscle cell (SMC) and myofibroblast proliferation and migration likely play an important role in the pathogenesis of NH. Epoxyeicosatrienoic acids (EETs), the products of the catabolism of arachidonic acid by cytochrome P450 enzymes, possess anti-inflammatory, antiproliferative, antimigratory and vasodilatory properties that should reduce NH. The degradation of vasculoprotective EETs is catalyzed by the enzyme, soluble epoxide hydrolase (sEH). sEH upregulation may thus contribute to NH development by the enhanced removal of vasculoprotective EETs. In this study, sEH, cytochrome P450 and EETs were examined after AVG placement in a porcine model to explore their potential roles in AVG stenosis. Increased sEH protein expression, decreased P450 epoxygenase activity and dysregulation of 5 oxylipin mediators were observed in the graft-venous anastomotic tissues when compared to control veins. Pharmacological inhibitors of sEH decreased the growth factor-induced migration of SMCs and fibroblasts, although they had no significant effect on the proliferation of these cells. These results provide insights on epoxide biology in vascular disorders and a rationale for the development of novel pharmacotherapeutic strategies to prevent AVG failure due to NH and stenosis. © 2014 S. Karger AG, Basel.

  13. An unusual case of fistula formation and thrombosis between arteriovenous graft and a native vein

    Directory of Open Access Journals (Sweden)

    Young Sub Kim

    2016-03-01

    Full Text Available Arteriovenous graft for hemodialysis vascular access is a widely used technique with many advantages. However, it has crucial complications with graft thrombosis and infection. We recently experienced an unusual case of arteriovenous graft complication involving graft thrombosis related to fistula formation between the graft and the natural vein with infection. We diagnosed this condition using Doppler ultrasound and computed tomography angiography. Successful surgical treatment including partial graft excision and creation of a secondary arteriovenous fistula using an inadvertently dilated cephalic vein was performed. The dialysis unit staff should keep this condition in mind and try to prevent this complication.

  14. A comparative clinico-radiographic study of guided tissue regeneration with bioresorbable membrane and a composite synthetic bone graft for the treatment of periodontal osseous defects

    Directory of Open Access Journals (Sweden)

    Sumedha Srivastava

    2015-01-01

    Full Text Available Aim: The aim was to evaluate the bonefill in periodontal osseous defects with the help of guided tissue regeneration, bioresorbable membrane (PerioCol + bone graft (Grabio Glascera in combination and with bonegraft (Grabio Glascera alone. Materials and Methods: The study involved total 30 sites in systemically healthy 19 patients. The parameters for evaluation includes plaque index sulcus bleeding index with one or more periodontal osseous defects having (i probing depth (PD of ≥ 5 mm (ii clinical attachment loss (CAL of ≥ 5 mm and (iii ≥3 mm of radiographic periodontal osseous defect (iv bonefill (v crestal bone loss (vi defect resolution. The study involved the three wall and two wall defects which should be either located interproximally or involving the furcation area. The statistical analysis was done using Statistical Package for Social Sciences, the Wilcoxon signed rank statistic W + for Mann-Whitney U-test. Results: The net gain in PD and CAL after 6 months for Group I ([PerioCol] + [Grabio Glascera] and Group II (Grabio Glascera was 3.94 ± 1.81 mm, 3.57 ± 2.21 mm and 3.94 ± 1.81, 3.57 ± 2.21 mm, respectively. The results of the study for Group I and Group II with regards to mean net bonefill, was 3.25 ± 2.32 (58% mm and 5.14 ± 3.84 (40.26 ± 19.14% mm, crestal bone loss − 0.25 ± 0.68 mm and − 0.79 ± 1.19 mm. Defect resolution 3.50 ± 2.34 mm and 5.93 ± 4.01 mm, respectively. Conclusion: On comparing both the groups together after 6 months of therapy, the results were equally effective for combination of graft and membrane versus bone graft alone since no statistical significant difference was seen between above parameters for both the groups. Thus, both the treatment modalities are comparable and equally effective.

  15. Clinical trial and in-vitro study comparing the efficacy of treating bony lesions with allografts versus synthetic or highly-processed xenogeneic bone grafts

    DEFF Research Database (Denmark)

    Kubosch, Eva Johanna; Bernstein, Anke; Wolf, Laura

    2016-01-01

    BACKGROUND: Our study aim was to compare allogeneic cancellous bone (ACB) and synthetic or highly-processed xenogeneic bone substitutes (SBS) in the treatment of skeletal defects in orthopedic surgery. METHODS: 232 patients treated for bony lesions with ACB (n = 116) or SBS (n = 116) within a 10......-year time period were included in this case-control study. Furthermore, both materials were seeded with human osteoblasts (hOB, n = 10) and analyzed by histology, for viability (AlamarBlue®) and protein expression activity (Luminex®). RESULTS: The complication rate was 14.2 %, proportion of defects....... Histological examination revealed similar bone structures, whereas cell remnants were apparent only in the allografts. Both materials were biocompatible in-vitro, and seeded with human osteoblasts. The cells remained vital over the 3-week culture period and produced microscopically typical bone matrix. We...

  16. Depression in hemodialysis patients

    International Nuclear Information System (INIS)

    Anees, M.; Barki, H.; Masood, M.

    2008-01-01

    To measure the frequency of depression and its risk factors in patients under going hemodialysis. It is a cross-sectional prospective study conducted at Hemodialysis unit of Shalamar Hospital and Shaikh Zayed Hospital, Lahore from 1/sup st/ January 2006 to 30/sup th/ April 2006. All patients getting regular hemodialysis for more than three months were included. Beck's Depression Inventory- II (BDI-II; adapted in Urdu) was administered on all the patients who were able to read or understand it. Blood sample were drawn at the same time for routine hematological, biochemical parameters and viral markers (Anti HCV and HbsAg). Diagnosis was made as per Diagnostic and Statistical Manual of Mental Disorders, fourth edition (DSM IV) for correlation of psychological variables with clinical, hematological and biochemical parameters. Eighty nine patients were enrolled which included fifty two (58.4%) were male and seventy seven (86.5%) were married. Major causes of renal failure were diabetes, hypertension and chronic glomerulonephrotis. Duration of dialysis was from 03 to 49 months with mean of 19.64 +- 11.7 months. Severity of depression was categorized in to mild, moderate and severe on the basis of BDI score. Majority of the patients fifty (56.1%) were moderately to severely depressed and there was no gender difference in the prevalence of depression. Majority of patients undergoing hemodialysis were depressed. Major risk factors for depression were marital status, illiteracy, number of children, socioeconomic factors, gender, hypertension and hypoalbuminemia. Patients with anemia, hyponatremia and hyperkalemia had suicidal tendency. Patients with hepatitis C and disturbed liver function have strong correlation with psychological parameters. (author)

  17. Development of a one-step approach for the reconstruction of full thickness skin defects using minced split thickness skin grafts and biodegradable synthetic scaffolds as a dermal substitute.

    Science.gov (United States)

    Sharma, Kavita; Bullock, Anthony; Ralston, David; MacNeil, Sheila

    2014-08-01

    Tissue engineering has progressed in delivering laboratory-expanded keratinocytes to the clinic; however the production of a suitable alternative to a skin graft, containing both epidermis and dermis still remains a challenge. To develop a one-step approach to wound reconstruction using finely minced split thickness skin and a biodegradable synthetic dermal substitute. This was explored in vitro using scalpel diced pieces of split thickness human skin combined with synthetic electrospun polylactide (PLA) scaffolds. To aid the spreading of tissue, 1% methylcellulose was used and platelet releasate was examined for its effect on cellular outgrowth from tissue explants. The outcome parameters included the metabolic activity of the migrating cells and their ability to produce collagen. Cell presence and migration on the scaffolds were assessed using fluorescence microscopy and SEM. Cells were identified as keratinocytes by immunostaining for pan-cytokeratin. Collagen deposition was quantified by using Sirius red. Skin cells migrated along the fibers of the scaffold and formed new collagen. 1% methylcellulose improved the tissue handling properties of the minced skin. Platelet releasate did not stimulate the migration of skin cells along scaffold fibers. Immunohistochemistry and SEM confirmed the presence of both epithelial and stromal cells in the new tissue. We describe the first key steps in the production of a skin substitute to be assembled in theatre eliminating the need for cell culture. Whilst further experiments are needed to develop this technique it can be a useful addition to armamentarium of the reconstructive surgeon. Copyright © 2013 Elsevier Ltd and ISBI. All rights reserved.

  18. Nosocomial infective endocarditis in Hemodialysis

    International Nuclear Information System (INIS)

    Bhat, A.W.; Solangi, S.; Murtada, O.

    2002-01-01

    There is an increased risk of infective endocarditis catheterization usedfor Hemodialysis. We report a case of a young man who had endocarditissecondary to the use of a permanent jugular catheter for hemodialysis. Bloodcultures were repeatedly negative, but vegetations were seen on the tricuspidvalve on echocardiography. A high index of suspicion is recommended for thisserious complication. (author)

  19. Pulmonary gas exchange during hemodialysis.

    Science.gov (United States)

    Bouffard, Y; Viale, J P; Annat, G; Guillaume, C; Percival, C; Bertrand, O; Motin, J

    1986-12-01

    Pulmonary gas exchange was continuously measured in 13 mechanically ventilated patients during 24 hemodialyses for acute renal failure. Minute-ventilation was maintained constant by controlled ventilation and gas exchange was continuously measured by a mass-spectrometer system. Three groups were compared: a cuprophan membrane with an acetate dialysate; a polyacrilonitrile membrane (PAN) with an acetate dialysate; and PAN with a bicarbonate dialysate. Arterial PO2 and the O2 alveolar-arterial gradient were the same regardless of the membrane used. [H+] mildly decreased with all dialysates used. Arterial PCO2 decreased only with the acetate dialysate. O2 consumption increased, up to 20 +/- 5% of the initial values during hemodialysis, and remained increased during the two hours following the hemodialysis. Respiratory exchange ratio was lower after than before the hemodialysis. the maintenance of a constant minute ventilation prevented hemodialysis induced hypoxemia. VO2 increased during hemodialysis.

  20. Solar-assisted hemodialysis.

    Science.gov (United States)

    Agar, John W M; Perkins, Anthony; Tjipto, Alwie

    2012-02-01

    Hemodialysis resource use-especially water and power, smarter processing and reuse of postdialysis waste, and improved ecosensitive building design, insulation, and space use-all need much closer attention. Regarding power, as supply diminishes and costs rise, alternative power augmentation for dialysis services becomes attractive. The first 12 months of a solar-assisted dialysis program in southeastern Australia is reported. A 24-m(2), 3-kWh rated solar array and inverter-total cost of A$16,219-has solar-assisted the dialysis-related power needs of a four-chair home hemodialysis training service. All array-created, grid-donated power and all grid-drawn power to the four hemodialysis machines and minireverse osmosis plant pairings are separately metered. After the grid-drawn and array-generated kilowatt hours have been billed and reimbursed at their respective commercial rates, financial viability, including capital repayment, can be assessed. From July of 2010 to July of 2011, the four combined equipment pairings used 4166.5 kWh, 9% more than the array-generated 3811.0 kWh. Power consumption at 26.7 c/kWh cost A$1145.79. Array-generated power reimbursements at 23.5 c/kWh were A$895.59. Power costs were, thus, reduced by 76.5%. As new reimbursement rates (60 c/kWh) take effect, system reimbursements will more than double, allowing both free power and potential capital pay down over 7.7 years. With expected array life of ∼30 years, free power and an income stream should accrue in the second and third operative decades. Solar-assisted power is feasible and cost-effective. Dialysis services should assess their local solar conditions and determine whether this ecosensitive power option might suit their circumstance.

  1. Fifty years of hemodialysis access literature: The fifty most cited publications in the medical literature.

    Science.gov (United States)

    Skripochnik, Edvard; O'Connor, David J; Trestman, Eric B; Lipsitz, Evan C; Scher, Larry A

    2018-02-01

    Objectives The modern era of hemodialysis access surgery began with the publication in 1966 by Brescia et al. describing the use of a surgically created arteriovenous fistula. Since then, the number of patients on chronic hemodialysis and the number of publications dealing with hemodialysis access have steadily increased. We have chronicled the increase in publications in the medical literature dealing with hemodialysis access by evaluating the characteristics of the 50 most cited articles. Methods We queried the Science Citation Index from the years 1960-2014. Articles were selected based on a subject search and were ranked according to the number of times they were cited in the medical literature. Results The 50 most frequently cited articles were selected for further analysis and the number of annual publications was tracked. The landmark publication by Dr Brescia et al. was unequivocally the most cited article dealing with hemodialysis access (1109 citations). The subject matter of the papers included AV fistula and graft (9), hemodialysis catheter (9), complications and outcomes (24), and other topics (8). Most articles were published in nephrology journals (33), with fewer in surgery (7), medicine (7), and radiology (3) journals. Of the 17 journals represented, Kidney International was the clear leader, publishing 18 articles. There has been an exponential rise in the frequency of publications regarding dialysis access with 42 of 50 analyzed papers being authored after 1990. Conclusion As the number of patients on hemodialysis has increased dramatically over the past five decades, there has been a commensurate increase in the overall number of publications related to hemodialysis access.

  2. Music for Hemodialysis patients

    DEFF Research Database (Denmark)

    Gross, B; Ketema Wassie, F; Agnholt, Hanne

    by alarms given by the machine during dialysis. The musical genre used in the study was well suited for patients undergoing first-time dialysis, as 80% (n=16) of the patients were pleased with the music. Although this is only a preliminary study with a limited number of patients, it shows an indication......Music for hemodialysis patients Background Patients starting a new regimen of dialysis often experience anxiety and other psychological disturbances. They struggle with the unknown situation, feelings of uncertainty and on top of that, a high level of sophisticated technological equipment. Music...... is known from literature to influence and dampen anxiety and tension and has been used for millennia in the treatment of illness. Here we report a study on the influence of music on patients undergoing dialysis and whether music has a potential for lowering discomfort in patients during first-time dialysis...

  3. Effectiveness of beraprost sodium in maintaining vascular access patency in patients on hemodialysis.

    Science.gov (United States)

    Kim, Miyeon; Kim, Ji Ung; Kim, So Mi; Kim, HyunWoo

    2017-07-01

    Hemodialysis vascular access dysfunction, mostly attributed to neointimal hyperplasia, is a major cause of morbidity and hospitalization in patients on hemodialysis. It has been reported that prostaglandin I 2 has pleiotropic effects including anti-platelet, vasodilating, anti-inflammatory, and anti-atherogenic properties. In addition, several studies have shown that prostaglandin I 2 can inhibit neointimal formation after vascular injury. This study aimed to investigate the effects of beraprost sodium, an oral synthetic analog of prostaglandin I 2 , on vascular access patency in patients on hemodialysis who experienced primary hemodialysis vascular access failure. Fifty-five patients with end-stage renal disease who were on hemodialysis were prospectively selected for this study. Twenty-three patients were assigned to be treated with 120 µg/day of beraprost sodium, while remaining patients (n = 32) were assigned to a control group. The primary outcome was primary unassisted vascular access patency at 2 years. The incidence of primary unassisted patency at 2 years was 83% in the beraprost sodium group and 38% in the control group (p = 0.001). Analysis of covariables indicated that this effect occurred mainly as a result of beraprost sodium administration. No life-threatening adverse event or severe bleeding was recorded in any of the groups. Our data indicated that an oral prostaglandin I 2 analog, beraprost sodium, is effective and safe for the maintenance of vascular access patency in patients on hemodialysis with primary vascular access failure.

  4. Dietary Guidelines for Adults Starting on Hemodialysis

    Science.gov (United States)

    ... 38 ounces of oral fluid. Reference: ESHA “Food Processor” nutrition software, version 8.5.0 The National ... for specific treatment recommendations. Print Email Read related articles Nutrition and Hemodialysis The Buttonhole Technique Hemodialysis Catheters: ...

  5. Adolescent External Iliac Artery Trauma: Recurrent Aneurysmal Dilatation of an Iliofemoral Saphenous Vein Graft Treated by Stent-Grafting

    International Nuclear Information System (INIS)

    Lenton, James; Davies, John; Homer-Vanniasinkam, S.; McPherson, Simon

    2008-01-01

    An adolescent male sustained a severe penetrating injury to the external iliac artery. Emergency surgical revascularization was with a reversed long saphenous vein interposition graft. The primary graft and the subsequent revision graft both became aneurysmal. The second graft aneurysm was successfully excluded by endovascular stent-grafts with medium-term primary patency. A venous graft was used initially rather than a synthetic graft to reduce the risk of infection and the potential problems from future growth. Aneurysmal dilatation of venous grafts in children and adolescents is a rare but recognized complication. To the best of our knowledge, exclusion of these aneurysms with stent-grafts has not been previously reported in the adolescent population.

  6. Vascular access hemorrhages contribute to deaths among hemodialysis patients.

    Science.gov (United States)

    Ellingson, Katherine D; Palekar, Rakhee S; Lucero, Cynthia A; Kurkjian, Katherine M; Chai, Shua J; Schlossberg, Dana S; Vincenti, Donna M; Fink, Jeffrey C; Davies-Cole, John O; Magri, Julie M; Arduino, Matthew J; Patel, Priti R

    2012-09-01

    In 2007 the Maryland Medical Examiner noted a potential cluster of fatal vascular access hemorrhages among hemodialysis patients, many of whom died outside of a health-care setting. To examine the epidemiology of fatal vascular access hemorrhages, we conducted a retrospective case review in District of Columbia, Maryland, and Virginia from January 2000 to July 2007 and a case-control study. Records from the Medical Examiner and Centers for Medicare and Medicaid Services were reviewed, from which 88 patients were identified as fatal vascular access hemorrhage cases. To assess risk factors, a subset of 20 cases from Maryland was compared to 38 controls randomly selected among hemodialysis patients who died from non-vascular access hemorrhage causes at the same Maryland facilities. Of the 88 confirmed cases, 55% hemorrhaged from arteriovenous grafts, 24% from arteriovenous fistulas, and 21% from central venous catheters. Of 82 case-patients with known location of hemorrhage, 78% occurred at home or in a nursing home. In the case-control analysis, statistically significant risk factors included the presence of an arteriovenous graft, access-related complications within 6 months of death, and hypertension; presence of a central venous catheter was significantly protective. Psychosocial factors and anticoagulant medications were not significant risk factors. Effective strategies to control vascular access hemorrhage in the home and further delineation of warning signs are needed.

  7. Patients on hemodialysis are better served by a proximal arteriovenous fistula for long-term venous access.

    LENUS (Irish Health Repository)

    Sultan, Sherif

    2012-11-01

    Patients with end-stage renal disease should have arteriovenous fistula (AVF) formation 3 to 6 months prior to commencing hemodialysis (HD). However, this is not always possible with strained health care resources. We aim to compare autologous proximal AVF (PAVF) with distal AVF (DAVF) in patients already on HD. Primary end point is 4-year functional primary. Secondary end point is freedom from major adverse clinical events (MACEs). From January 2003 to June 2009, out of 495 AVF formations, 179 (36%) patients were already on HD. These patients had 200 AVF formations (49 DAVF vs 151 PAVF) in arms in which no previous fistula had been formed. No synthetic graft was used. Four-year primary functional patency significantly improved with PAVF (68.9% ± SD 8.8%) compared to DAVF (7.3% ± SD 4.9%; P < .0001). Five-year freedom from MACE was 85% with PAVF compared to 40% with DAVF (P < .005). Proximal AVF bestows long-term functional access with fewer complications compared to DAVF for patients already on HD.

  8. Vascular access for hemodialysis: current perspectives

    Directory of Open Access Journals (Sweden)

    Santoro D

    2014-07-01

    Full Text Available Domenico Santoro,1 Filippo Benedetto,2 Placido Mondello,3 Narayana Pipitò,2 David Barillà,2 Francesco Spinelli,2 Carlo Alberto Ricciardi,1 Valeria Cernaro,1 Michele Buemi11Department of Clinical and Experimental Medicine, Unit of Nephrology, 2Unit of Vascular Surgery, 3Unit of Infectious Disease, University of Messina, ItalyAbstract: A well-functioning vascular access (VA is a mainstay to perform an efficient hemodialysis (HD procedure. There are three main types of access: native arteriovenous fistula (AVF, arteriovenous graft, and central venous catheter (CVC. AVF, described by Brescia and Cimino, remains the first choice for chronic HD. It is the best access for longevity and has the lowest association with morbidity and mortality, and for this reason AVF use is strongly recommended by guidelines from different countries. Once autogenous options have been exhausted, prosthetic fistulae become the second option of maintenance HD access alternatives. CVCs have become an important adjunct in maintaining patients on HD. The preferable locations for insertion are the internal jugular and femoral veins. The subclavian vein is considered the third choice because of the high risk of thrombosis. Complications associated with CVC insertion range from 5% to 19%. Since an increasing number of patients have implanted pacemakers and defibrillators, usually inserted via the subclavian vein and superior vena cava into the right heart, a careful assessment of risk and benefits should be taken. Infection is responsible for the removal of about 30%–60% of HD CVCs, and hospitalization rates are higher among patients with CVCs than among AVF ones. Proper VA maintenance requires integration of different professionals to create a VA team. This team should include a nephrologist, radiologist, vascular surgeon, infectious disease consultant, and members of the dialysis staff. They should provide their experience in order to give the best options to uremic

  9. Hemodialysis and water quality.

    Science.gov (United States)

    Coulliette, Angela D; Arduino, Matthew J

    2013-01-01

    Over 383,900 individuals in the U.S. undergo maintenance hemodialysis that exposes them to water, primarily in the form of dialysate. The quality of water and associated dialysis solutions have been implicated in adverse patient outcomes and is therefore critical. The Association for the Advancement of Medical Instrumentation has published both standards and recommended practices that address both water and the dialyzing solutions. Some of these recommendations have been adopted into Federal Regulations by the Centers for Medicare and Medicaid Services as part of the Conditions for Coverage, which includes limits on specific contaminants within water used for dialysis, dialysate, and substitution fluids. Chemical, bacterial, and endotoxin contaminants are health threats to dialysis patients, as shown by the continued episodic nature of outbreaks since the 1960s causing at least 592 cases and 16 deaths in the U.S. The importance of the dialysis water distribution system, current standards and recommendations, acceptable monitoring methods, a review of chemical, bacterial, and endotoxin outbreaks, and infection control programs are discussed. Published 2013. This article is a U.S. Government work and is in the public domain in the USA.

  10. [Ocular complications in chronic hemodialysis].

    Science.gov (United States)

    Voinea, L; Palamariu, M

    1997-01-01

    Ocular pathology at the patients with chronic hemodialysis improves important alterations of the anterior and posterior pole less studied up to the present time. We examined a group of ninety-six follow-up patients at Nephrology Clinical of "Carol Davila" Hospital between twenty one-seventy years old. The pathological aspects were related with: the value of biochemical constants (urea, calcium, phosphate), length of hemodialysis treat and arterial pressure. The most alterations of posterior pole were at the papilla (papillar edema, papillar uncolored and vascular alterations as a result of advanced atherosclerogenic processes and optical ischemic neuropathy, characteristics of these patients.

  11. Short-term Outcome of Coronary Artery Bypass Grafting in Patients ...

    African Journals Online (AJOL)

    Introduction: Coronary artery disease is a major cause of death in patients on maintenance hemodialysis (HD). The morbidity and mortality of coronary artery bypass grafting (CABG) for patients on chronic HD are reported to be high. In the present study, the outcome of CABG in a group of HD patients was examined.

  12. Transhepatic venous catheters for hemodialysis

    Directory of Open Access Journals (Sweden)

    Mohamed El Gharib

    2014-06-01

    Conclusion: Based on our findings, transhepatic hemodialysis catheters have proven to achieve good long-term functionality. A high level of maintenance is required to preserve patency, although this approach provides remarkably durable access for patients who have otherwise exhausted access options.

  13. Proteomic Investigations into Hemodialysis Therapy

    Science.gov (United States)

    Bonomini, Mario; Sirolli, Vittorio; Pieroni, Luisa; Felaco, Paolo; Amoroso, Luigi; Urbani, Andrea

    2015-01-01

    The retention of a number of solutes that may cause adverse biochemical/biological effects, called uremic toxins, characterizes uremic syndrome. Uremia therapy is based on renal replacement therapy, hemodialysis being the most commonly used modality. The membrane contained in the hemodialyzer represents the ultimate determinant of the success and quality of hemodialysis therapy. Membrane’s performance can be evaluated in terms of removal efficiency for unwanted solutes and excess fluid, and minimization of negative interactions between the membrane material and blood components that define the membrane’s bio(in)compatibility. Given the high concentration of plasma proteins and the complexity of structural functional relationships of this class of molecules, the performance of a membrane is highly influenced by its interaction with the plasma protein repertoire. Proteomic investigations have been increasingly applied to describe the protein uremic milieu, to compare the blood purification efficiency of different dialyzer membranes or different extracorporeal techniques, and to evaluate the adsorption of plasma proteins onto hemodialysis membranes. In this article, we aim to highlight investigations in the hemodialysis setting making use of recent developments in proteomic technologies. Examples are presented of why proteomics may be helpful to nephrology and may possibly affect future directions in renal research. PMID:26690416

  14. Proteomic Investigations into Hemodialysis Therapy

    Directory of Open Access Journals (Sweden)

    Mario Bonomini

    2015-12-01

    Full Text Available The retention of a number of solutes that may cause adverse biochemical/biological effects, called uremic toxins, characterizes uremic syndrome. Uremia therapy is based on renal replacement therapy, hemodialysis being the most commonly used modality. The membrane contained in the hemodialyzer represents the ultimate determinant of the success and quality of hemodialysis therapy. Membrane’s performance can be evaluated in terms of removal efficiency for unwanted solutes and excess fluid, and minimization of negative interactions between the membrane material and blood components that define the membrane’s bio(incompatibility. Given the high concentration of plasma proteins and the complexity of structural functional relationships of this class of molecules, the performance of a membrane is highly influenced by its interaction with the plasma protein repertoire. Proteomic investigations have been increasingly applied to describe the protein uremic milieu, to compare the blood purification efficiency of different dialyzer membranes or different extracorporeal techniques, and to evaluate the adsorption of plasma proteins onto hemodialysis membranes. In this article, we aim to highlight investigations in the hemodialysis setting making use of recent developments in proteomic technologies. Examples are presented of why proteomics may be helpful to nephrology and may possibly affect future directions in renal research.

  15. [Surgical management of limb prosthetic vascular graft exposure].

    Science.gov (United States)

    Wu, Hao; Wu, Wei-wei; Bai, Ming; Zeng, Rong; Song, Xiao-jun; Chen, Yu; Liu, Chang-wei

    2012-12-01

    To investigate the risk factors and surgical management of limb prosthetic vascular graft exposure. The clinical data of 17 patients suffering from limb prosthetic vascular graft exposure in Peking Union Medical College Hospital from August 2006 to December 2011 were retrospectively analyzed. Among 17 cases, 5 suffered from prosthetic vascular graft exposure after vascular bypass for the lower limb ischemia, whereas 12 were affected after the artificial graft arteriovenous fistula construction in the upper limbs for hemodialysis. The surgical procedures mainly included the local debridement as well as the local flap and transferred muscle-cutaneous flap reconstruction to preserve the prosthetic vascular graft. All 17 patients underwent local flap or muscle-cutaneous flap coverage procedure. After the surgery, the prosthetic vascular graft was successfully salvaged in 14 cases. The total successful rate was 82.4%. The surgery failed in three patients, in whom the prosthetic vascular grafts were finally removed. Local flap and transferred muscle-cutaneous flap reconstruction is an effective surgical management to salvage the exposed grafts.

  16. Computerized tomographic evaluation of aortic prosthetic graft complications

    International Nuclear Information System (INIS)

    Kay, D.; Kalmar, J.A.

    1985-01-01

    Computerized tomography has been found to be an accurate and sensitive method of diagnosing complications of synthetic aortic grafts. Complications in this series of four cases included aortoesophageal fistula, aortoduodenal fistula, pseudoaneurysm, and retroperitoneal hematoma. 6 references, 5 figures

  17. Hemodialysis in children: general practical guidelines.

    Science.gov (United States)

    Fischbach, M; Edefonti, A; Schröder, C; Watson, A

    2005-08-01

    Over the past 20 years children have benefited from major improvements in both technology and clinical management of dialysis. Morbidity during dialysis sessions has decreased with seizures being exceptional and hypotensive episodes rare. Pain and discomfort have been reduced with the use of chronic internal jugular venous catheters and anesthetic creams for fistula puncture. Non-invasive technologies to assess patient target dry weight and access flow can significantly reduce patient morbidity and health care costs. The development of urea kinetic modeling enables calculation of the dialysis dose delivery, Kt/V, and an indirect assessment of the intake. Nutritional assessment and support are of major importance for the growing child. Even if the validity of these "urea only" data is questioned, their analysis provides information useful for follow-up. Newer machines provide more precise control of ultrafiltration by volumetric assessment and continuous blood volume monitoring during dialysis sessions. Buffered bicarbonate solutions are now standard and more biocompatible synthetic membranes and specific small size material dialyzers and tubing have been developed for young infants. More recently, the concept of "ultrapure" dialysate, i.e. free from microbiological contamination and endotoxins, has developed. This will enable the use of hemodiafiltration, especially with the on-line option, which has many theoretical advantages and should be considered in the case of maximum/optimum dialysis need. Although the optimum dialysis dose requirement for children remains uncertain, reports of longer duration and/or daily dialysis show they are more effective for phosphate control than conventional hemodialysis and should be considered at least for some high-risk patients with cardiovascular impairment. In children hemodialysis has to be individualized and viewed as an "integrated therapy" considering their long-term exposure to chronic renal failure treatment. Dialysis is

  18. Changes in Plasma Copeptin Levels during Hemodialysis : Are the Physiological Stimuli Active in Hemodialysis Patients?

    NARCIS (Netherlands)

    Ettema, Esmee M.; Kuipers, Johanna; Assa, Solmaz; Bakker, Stephan J. L.; Groen, Henk; Westerhuis, Ralf; Gaillard, Carlo A. J. M.; Gansevoort, Ron T.; Franssen, Casper F. M.

    2015-01-01

    Objectives Plasma levels of copeptin, a surrogate marker for the vasoconstrictor hormone arginine vasopressin (AVP), are increased in hemodialysis patients. Presently, it is unknown what drives copeptin levels in hemodialysis patients. We investigated whether the established physiological stimuli

  19. Recent progress on the design and applications of polysaccharide-based graft copolymer hydrogels as adsorbents for wastewater purification

    CSIR Research Space (South Africa)

    Mittal, Hemant

    2016-05-01

    Full Text Available as emulsifiers and thickeners. In their natural form, gum polysaccharides have poor mechanical and physical properties; therefore, they are frequently modified with various synthetic monomers such as acrylamide and acrylic acid using graft copolymerization. Graft...

  20. The Effect of Frequent Hemodialysis on Nutrition and Body Composition: Frequent Hemodialysis Network Trial

    OpenAIRE

    Kaysen, George A.; Greene, Tom; Larive, Brett; Mehta, Ravindra, L.; Lindsay, Robert; Depner, Tom A.; Hall, Yoshio N.; Daugirdas, John T.; Chertow, Glenn M.

    2012-01-01

    We investigated the effects of frequency of hemodialysis on nutritional status by analyzing the data in the Frequent Hemodialysis Network Trial. We compared changes in albumin, body weight and composition among 245 patients randomized to 6- or 3-times per week in-center hemodialysis (Daily Trial) and 87 patients randomized to 6-times per week nocturnal or 3-times per week conventional hemodialysis, performed largely at home (Nocturnal Trial). In the Daily Trial, there were no significant diff...

  1. Increased Cerebral Water Content in Hemodialysis Patients

    OpenAIRE

    Reetz, Kathrin; Abbas, Zaheer; Eitner, Frank; Gross, Theresa; Schulz, Jörg Bernhard; Floege, Jürgen; Shah, N. J.; Costa, Ana Sofia; Gras, Vincent; Tiffin-Richards, Frances; Mirzazade, Shahram; Holschbach, Bernhard; Frank, Rolf Dario; Vassiliadou, Athina; Krüger, Thilo

    2015-01-01

    Little information is available on the impact of hemodialysis on cerebral water homeostasis and its distribution in chronic kidney disease. We used a neuropsychological test battery, structural magnetic resonance imaging (MRI) and a novel technique for quantitative measurement of localized water content using 3T MRI to investigate ten hemodialysis patients (HD) on a dialysis-free day and after hemodialysis (2.4±2.2 hours), and a matched healthy control group with the same time interval. Neuro...

  2. Tuberculosis in children undergoing hemodialysis

    Directory of Open Access Journals (Sweden)

    Gargah Tahar

    2010-04-01

    Full Text Available Gargah Tahar1, Goucha-Louzir Rim2, Lakhoua Mohamed Rachid11Department of Pediatric Nephrology, 2Department of Nephrology, Charles Nicolle Hospital, Tunis, TunisiaAbstract: Tuberculosis (TB remains a public health problem in Tunisia. Its incidence is higher in immunocompromised hosts than in the general population. In children and during hemodialysis, TB is characterized by the frequency of extrapulmonary localizations and diagnostic difficulties. The aim of this retrospective study is to evaluate the incidence of TB in Tunisian children undergoing hemodialysis and to determine its clinical features as well as the results of chemotherapy.Method: This retrospective study includes seven TB children among 112 children on hemodialysis at the pediatric nephrology department in Charles Nicolle Hospital from 2002 to 2008. The diagnosis of TB was established by a combination of clinical, radiological, biochemical, microbiological, and histological examinations. Treatment with anti-TB drugs, the results of therapy, and the outcome of patients were noted.Results: There were four girls and three boys aged 10 to 16 years (mean, 13 years. They had been on hemodialysis for 2 to 5 years (mean, 3 years. Noted clinical features were weight loss and fever in five cases, chest pain in one case, cervical lymph node in one case, and spinal pain in one case. The organ systems involved were pleural in two cases, pulmonary in one case, peritoneal in one case, cervical lymphatic in one case, and spinal in one case. One patient was treated empirically with a good response. Diagnosis was made by isolation of mycobacterium TB in three cases, by specific histological signs observed in a lymph node biopsy in one case, in peritoneal biopsy in one case, and in discovertebral biopsy in one case. In the remaining patient, the clinical and radiological presentations were compatible with pulmonary TB. All patients received four anti-TB drugs: isoniazid, rifampicin, pyrazinamide

  3. Comparative study of impact of hemodialysis and renal transplantation on cognitive functions in ESRD patients.

    Science.gov (United States)

    Anwar, Waleed; Ezzat, Haitham; Mohab, Amr

    2015-01-01

    Cognitive impairment is defined as a newly appeared deficit in at least two areas of cognitive functions, including disturbances in memory, executive functioning, attention or speed of information processing, perceptual motor abilities, or language. Cognitive impairment is highly prevalent in ESRD patients when compared with the general population. It has also been associated with a decreased quality of life. Cognitive functions in patients with ESRD showed improvement with dialysis and renal transplantation. These findings illustrate the potential importance of evaluating and comparing the effects of hemodialysis and transplantation regarding cognitive performance and thus quality of life in ESRD patients and normal subjects. This study was carried out in 100 patients (50 ESRD patients on regular hemodialysis for at least 6 months and 50 post-transplant patients who had maintained successful kidney graft for at least 3 months). All patients underwent laboratory and psychometric scoring tests, including trail making test part A, trail making test part B, digit span, and mini-mental state examination. Thirty healthy adults matched by age and sex served as a control group. The results showed significant differences in cognitive function tests results between transplant and hemodialysis patients (P0.05). Renal transplantation as a modality of treatment, in ESRD patients, is superior to hemodialysis in terms of cognitive performance improvement. Copyright © 2015 Sociedad Española de Nefrología. Published by Elsevier España, S.L.U. All rights reserved.

  4. Endovascular stent-graft exclusion of aortic dissection combined with renal failure

    International Nuclear Information System (INIS)

    Feng Xiang; Jing Zaiping; Yuan Weijie; Bao Junmin; Zhao Zhiqing; Zhao Jun; Lu Qingsheng

    2003-01-01

    Objective: To investigate the indications and peri-operative management of endovascular graft exclusion of aortic dissection combined with renal failure. Methods: Endovascular graft exclusion for Stanford B type thoracic aortic dissection had been preformed on 136 patients including two complicated with renal failure. Hemodialysis was preformed before operation with the fluid infusion controlled during the operation and bed-side hemodialysis after the operation for the latter. Results: All the 2 cases with renal failure complication were successfully carried out, and the peri-operative metabolism and circulation were kept on smoothly. Conclusions: Under good peri-operative management, patients having aortic dissection combined with renal failure could receive the endovascular graft exclusion of aortic dissection safely

  5. FDA Regulatory Perspectives for Studies on Hemodialysis Vascular Access.

    Science.gov (United States)

    Hurst, Frank P; Lee, Robert E; Thompson, Aliza M; Pullin, Brian D; Silverstein, Douglas M

    2018-03-07

    In an effort to foster innovation and new product development, the American Society of Nephrology and the US Food and Drug Administration partnered to form the Kidney Health Initiative in 2012. Part of the Kidney Health Initiative's mission is to foster development of therapies by creating a collaborative environment where the US Food and Drug Administration and the greater nephrology community can interact to optimize product evaluation. This particular Kidney Health Initiative project focused on products related to hemodialysis vascular access, with the goal of clarifying appropriate trial end points that could subsequently inform clinical, regulatory, and coverage decisions. Both the lack of common definitions and the lack of consensus on trial end points have been viewed as barriers to innovation in this area. Toward this end, the Kidney Health Initiative convened teams of expert stakeholders to address these issues for each major vascular access category (arteriovenous grafts, arteriovenous fistulas, and central venous catheters), and each team provided recommendations. This commentary provides an overview of the US Food and Drug Administration centers that regulate hemodialysis vascular access and certain laws and regulations that affect these products as well as our perspectives on some of the issues raised and end points proposed by the Kidney Health Initiative teams. The standardized definitions and clinical trial end points proposed by the teams represent an important step forward to improve innovation in this area. Copyright © 2018 by the American Society of Nephrology.

  6. Hemodialysis in Asia.

    Science.gov (United States)

    Prasad, Narayan; Jha, Vivekanand

    2015-12-01

    Asia is the largest, most populous and most heterogeneous continent in the world. The number of patients with end-stage renal disease is growing rapidly in Asia. A fully informed report on the status of dialysis therapies including hemodialysis (HD) is limited by the lack of systematic registries. Available data suggest remarkable heterogeneities, with some countries like Taiwan, Japan and Korea exhibiting well-established HD systems, high prevalence and universal access to all patients, while low- and low-middle income countries are unable to provide HD to eligible patients because of high cost and poor healthcare systems. Many Asian countries have unregulated dialysis units, with poor standards of delivery, quality control and outcome reporting. This leads to high mortality due to preventable complications like infections. Modeling data suggest that at least 2.9 million people need dialysis in Asia, which represents a gap in availability of dialysis to the tune of -66%. The population is projected to grow rapidly in the coming years. Several countries are expanding access to HD. Innovative modifications in dialysis practice are being made to optimize outcomes. It is important to develop robust systems of documentation and outcome reporting to evaluate the effects of such changes. HD needs to develop in conjunction with effective preventive programs and improvement of health systems. The practice of HD in Asia is growing and evolving. Rapid expansion will improve the currently dismal access to care for large sections of the population. Quality issues need to be addressed if the full benefit of this therapy is to reach the population. Developed countries of Asia can provide substantial messages to developing economies. HD programs must develop in conjunction with prevention efforts. (1) While developed Western and Asian countries provide end-stage renal disease patients full access to HD, healthcare systems from South and South-East Asia can offer access to HD only

  7. [The Carboclip, a new, atraumatic vascular access for hemodialysis].

    Science.gov (United States)

    Bonnaud, P; Jehenne, G; Man, N K

    1994-01-01

    The Carboclip is a no-needle vascular access device made of an inverted Titanium body. The horizontal bar of 6 mm inner diameter is connected with artery and vein via a vascular graft. The vertical body houses an elastic plug in which is inserted a double canula diving in the blood stream for extracorporeal blood circulation (EBC). The body is wrapped by a flange made of microporous biocarbon in which the subcutaneous fibroblast will growth, forming an antimicrobial barrier and fixing the port to the skin. We report our experience on 30 devices implanted in 30 sheep with 26 extracorporeal circulation simulating hemodialysis. The results demonstrate good tightness of the plug as well at rest as during EBC procedure, sufficient blood flow rate of about 400 ml/min, and benefits of the microporous carbon flange.

  8. Urea biosensor for hemodialysis monitoring

    Science.gov (United States)

    Glass, R.S.

    1999-01-12

    This research discloses an electrochemical sensor capable of detecting and quantifying urea in fluids resulting from hemodialysis procedures. The sensor is based upon measurement of the pH change produced in an aqueous environment by the products of the enzyme-catalyzed hydrolysis of urea. The sensor may be fabricated using methods amenable to mass fabrication, resulting in low-cost sensors and thus providing the potential for disposable use. In a typical application, the sensor could be used in treatment centers, in conjunction with an appropriate electronics/computer system, in order to determine the hemodialysis endpoint. The sensor can also be utilized to allow at-home testing to determine if dialysis was necessary. Such a home monitor is similar, in principle, to devices used for blood glucose testing by diabetics, and would require a blood droplet sample by using a finger prick. 9 figs.

  9. Optimizing lithium dosing in hemodialysis

    DEFF Research Database (Denmark)

    Bjarnason, N H; Munkner, R; Kampmann, J P

    2006-01-01

    We studied a 62-year-old female hemodialysis patient during initiation and maintenance of lithium carbonate therapy. Three different methods were applied to estimate the regimen: a scenario based on volume of distribution (V(d)), a scenario based on glomerular filtration rate (GFR), and a scenari...... immediately postdialysis. Further observations are necessary to obtain robust long-term safety data and to optimize the monitoring schedule....

  10. Annual Iron Loss Associated with Hemodialysis.

    Science.gov (United States)

    Tsukamoto, Tatsuo; Matsubara, Takayuki; Akashi, Yuka; Kondo, Morihiro; Yanagita, Motoko

    2016-01-01

    In order to keep up the optimal iron status in chronic hemodialysis patients, it is important to know how much iron is lost due to hemodialysis. Residual blood associated with the hemodialysis procedure together with blood sampling inevitably causes the loss of iron in chronic hemodialysis patients. Recent advances in hemodialysis techniques might have reduced this complication. In this cross-sectional study, we directly measured total iron loss by hemodialysis. Two hundred thirty-nine patients who received chronic hemodialysis at Otowa Memorial Hospital were enrolled; 65.7% of patients were men, and mean age was 67 ± 6.4 years (mean ± SD) and 43.2% were diabetic. Residual blood in blood tubing set and dialyzer after rinse back with saline was collected and homogenized. The iron content including free, protein-bound and heme iron was measured using an atomic absorption spectrometry. The mean iron content in residual blood was 1,247.3 ± 796.2 µg (mean ± SD) and the median was 1,002 µg (95% CI 377.6-3,461.6 µg), indicating 160.8 mg (95% CI 58.9-540.0 mg) iron loss annually when hemodialysis was performed 156 times a year. Fifty milliliter whole blood for monthly blood test and another 2 ml of whole blood lost by paracentesis at every dialysis session contains 228.6 and 118.9 mg iron at 11 g/dl hemoglobin, respectively. Therefore, an annual total iron loss due to hemodialysis comes to 508.3 mg (95% CI 406.4-887.5 mg). Five hundred milligram of annual iron supplementation might be sufficient to maintain iron status in hemodialysis patients, which is less than the dose recommended as 1,000-2,000 mg a year. Further study will be required to verify this iron supplementation dosage with recent hemodialysis procedure. © 2016 S. Karger AG, Basel.

  11. Role of graft oversizing in the fixation strength of barbed endovascular grafts.

    Science.gov (United States)

    Kratzberg, Jarin A; Golzarian, Jafar; Raghavan, Madhavan L

    2009-06-01

    The role of endovascular graft oversizing on risk of distal graft migration following endovascular aneurysm repair for abdominal aortic aneurysm is poorly understood. A controlled in vitro investigation of the role of oversizing in graft-aorta attachment strength for endovascular grafts (EVGs) with barbs was performed. Barbed stent grafts (N = 20) with controlled graft oversizing varying from 4-45% were fabricated while maintaining other design variables unchanged. A flow loop with physiological flow characteristics and a biosynthetic aortic aneurysm phantom (synthetic aneurysm model with a bovine aortic neck) were developed. The stent grafts were deployed into the aortic neck of the bio-synthetic aortic aneurysm phantom under realistic flow conditions. Computed tomography imaging of the graft-aorta complex was used to document attachment characteristics such as graft apposition, number of barbs penetrated, and penetration depth and angle. The strength of graft attachment to the aortic neck was assessed using mechanical pullout testing. Stent grafts were categorized into four groups based on oversizing: 4-10%; 11-20%; 21-30%; and greater than 30% oversizing. Pullout force, a measure of post-deployment fixation strength was not different between 4-10% (6.23 +/- 1.90 N), 11-20% (6.25 +/- 1.84 N) and 20-30% (5.85 +/- 1.89 N) groups, but significantly lower for the group with greater than 30% oversizing (3.67 +/- 1.41 N). Increasing oversizing caused a proportional decrease in the number of barbs penetrating the aortic wall (correlation = -0.83). Of the 14 barbs available in the stent graft, 89% of the barbs (12.5 of 14 on average) penetrated the aortic wall in the 4-10% oversizing group while only 38% (5.25 of 14) did for the greater than 30% group (P barb penetration were found to be positively correlated to pullout force. Greater than 30% graft oversizing affects both barb penetration and graft apposition adversely resulting in a low pullout force in this in vitro

  12. Valproic acid toxicokinetics : Serial hemodialysis and hemoperfusion

    NARCIS (Netherlands)

    Franssen, EJF; van Essen, GG; Portman, AT; Go, G; Stegeman, CA; Uges, DRA

    The toxicity and pharmacokinetic properties of a drug determine whether hemodialysis and/or hemoperfusion are indicated in acute intoxications. Valproic acid is considered unremovable by hemodialysis because of the high protein binding of 90%-95%. A 27-year-old male with a history of seizures was

  13. Clearance and synthesis rates of beta 2-microglobulin in patients undergoing hemodialysis and in normal subjects

    International Nuclear Information System (INIS)

    Floege, J.; Bartsch, A.; Schulze, M.; Shaldon, S.; Koch, K.M.; Smeby, L.C.

    1991-01-01

    Retention of β 2-microglobulin in patients undergoing hemodialysis is associated with a β 2-microglobulin-derived amyloidosis. Removal of β 2-microglobulin by renal replacement therapy has been proposed for the prevention of this amyloidosis. Currently, however, data on the β 2-microglobulin synthesis rate in patients undergoing hemodialysis are scarce, and consequently it remains speculative how much removal would be necessary to counterbalance synthesis. The plasma kinetics of iodine 131-labeled β 2-microglobulin were therefore examined in 11 patients with anuria who were undergoing long-term hemodialysis. Five healthy persons served as controls. Kinetic modeling of the plasma curves showed that the data fitted a two-pool model (r2 greater than 0.96) consisting of a rapid 2 to 4 hour distribution phase followed by a less steep curve, described by the plasma (metabolic) clearance (Clp). Synthetic rates were calculated from Clp and the β 2-microglobulin steady state plasma concentration (plus β 2-microglobulin removal during hemodialysis in the case of high flux hemodialysis). The results showed a significantly higher Clp in normal controls as compared with patients undergoing hemodialysis (65.5 ± 12.8 ml/min (mean ± SD) versus 3.4 ± 0.7 ml/min). In contrast, the β 2-microglobulin synthesis rate in the patient group (3.10 ± 0.79 mg/kg/day) was not significantly different from that of normal controls (2.40 ± 0.67 mg/kg/day), which was due to markedly elevated β 2-microglobulin plasma concentrations in the patients (37.6 ± 14.1 mg/L vs 1.92 ± 0.27 mg/L). These findings suggest that the presence of end-stage renal disease does not have a significant impact on the beta 2-microglobulin generation rate

  14. Synthetic Cannabinoids

    Directory of Open Access Journals (Sweden)

    Aslihan Okan Ibiloglu

    2017-09-01

    Full Text Available Synthetic cannabinoids which is a subgroup of cannabinoids are commonly used for recreational drug use throughout the whole world. Although both marijuana and synthetic cannabinoids stimulate the same receptors, cannabinoid receptor 1 (CB1 and cannabinoid receptor 2 (CB2, studies have shown that synthetic cannabinoids are much more potent than marijuana. The longer use of synthetic cannabinoids can cause severe physical and psychological symptoms that might even result in death, similar to many known illicit drugs. Main treatment options mostly involve symptom management and supportive care. The aim of this article is to discuss clinical and pharmacological properties of the increasingly used synthetic cannabinoids. [Psikiyatride Guncel Yaklasimlar - Current Approaches in Psychiatry 2017; 9(3.000: 317-328

  15. Arteriovenous Fistula Maturation in Prevalent Hemodialysis Patients in the United States: A National Study.

    Science.gov (United States)

    Woodside, Kenneth J; Bell, Sarah; Mukhopadhyay, Purna; Repeck, Kaitlyn J; Robinson, Ian T; Eckard, Ashley R; Dasmunshi, Sudipta; Plattner, Brett W; Pearson, Jeffrey; Schaubel, Douglas E; Pisoni, Ronald L; Saran, Rajiv

    2018-02-08

    Arteriovenous fistulas (AVFs) are the preferred form of hemodialysis vascular access, but maturation failures occur frequently, often resulting in prolonged catheter use. We sought to characterize AVF maturation in a national sample of prevalent hemodialysis patients in the United States. Nonconcurrent observational cohort study. Prevalent hemodialysis patients having had at least 1 new AVF placed during 2013, as identified using Medicare claims data in the US Renal Data System. Demographics, geographic location, dialysis vintage, comorbid conditions. Successful maturation following placement defined by subsequent use identified using monthly CROWNWeb data. AVF maturation rates were compared across strata of predictors. Patients were followed up until the earliest evidence of death, AVF maturation, or the end of 2014. In the study period, 45,087 new AVFs were placed in 39,820 prevalent hemodialysis patients. No evidence of use was identified for 36.2% of AVFs. Only 54.7% of AVFs were used within 4 months of placement, with maturation rates varying considerably across end-stage renal disease (ESRD) networks. Older age was associated with lower AVF maturation rates. Female sex, black race, some comorbid conditions (cardiovascular disease, peripheral artery disease, diabetes, needing assistance, or institutionalized status), dialysis vintage longer than 1 year, and catheter or arteriovenous graft use at ESRD incidence were also associated with lower rates of successful AVF maturation. In contrast, hypertension and prior AVF placement at ESRD incidence were associated with higher rates of successful AVF maturation. This study relies on administrative data, with monthly recording of access use. We identified numerous associations between AVF maturation and patient-level factors in a recent national sample of US hemodialysis patients. After accounting for these patient factors, we observed substantial differences in AVF maturation across some ESRD networks, indicating a

  16. Kinked Graft and Anastomotic Stenosis-Induced Hemolytic Anemia Requiring Reoperation.

    Science.gov (United States)

    Kitahara, Hiroto; Yoshitake, Akihiro; Hachiya, Takashi; Okamoto, Kazuma; Kawaguchi, Shinji; Shimizu, Hideyuki

    2016-01-01

    We report a case of hemolytic anemia caused initially by narrowing of a proximal anastomotic site and subsequently by a kinked prosthetic graft after total aortic arch replacement. A 55-year-old man was diagnosed with acute type A aortic dissection by computed tomography (CT). After total aortic arch replacement, hemolytic anemia and renal dysfunction developed. CT detected narrowing of proximal anastomotic site of the graft. Removing the graft and ascending aortic replacement resolved the signs of hemolytic anemia. However, 50 days after the surgery, severe hemolytic anemia developed again. CT revealed a sharply kinked graft. Total arch replacement was again performed to resect the kinked graft. He was discharged on the 24th postoperative day without hemodialysis. Copyright © 2016 Elsevier Inc. All rights reserved.

  17. Less Than Total Excision of Infected Prosthetic PTFE Graft Does Not Increase the Risk of Reinfection.

    Science.gov (United States)

    Sgroi, Michael D; Kirkpatrick, Vincent E; Resnick, Karen A; Williams, Russell A; Wilson, Samuel E; Gordon, Ian L

    2015-01-01

    Traditional treatment of infected polytetrafluoroethylene (PTFE) grafts consist of removal of the entire prosthesis. Closure of the native vessels may compromise vascular patency. We examined the outcomes for patients in whom a PTFE remnant of an infected graft was retained on the vessel. We reviewed the operating room log from 2000 to 2011 and identified all patients who had partial removal of an infected PTFE graft used for hemodialysis or peripheral bypass. These patients were examined for subsequent complications. Twenty-seven patients underwent 30 partial graft excisions with mean follow-up of 27 months. A total of 17% (5 of 30) of the partial graft resection procedures resulted in complications. Of 48 total remnants left behind at the arterial or venous anastomoses, reinfection occurred in 15%. Leaving a well-incorporated small 1-to 5-mm PTFE remnant at the arterial or venous anastomoses can be performed safely with a low risk of complications. © The Author(s) 2015.

  18. Bone grafting: An overview

    Directory of Open Access Journals (Sweden)

    D. O. Joshi

    2010-08-01

    Full Text Available Bone grafting is the process by which bone is transferred from a source (donor to site (recipient. Due to trauma from accidents by speedy vehicles, falling down from height or gunshot injury particularly in human being, acquired or developmental diseases like rickets, congenital defects like abnormal bone development, wearing out because of age and overuse; lead to bone loss and to replace the loss we need the bone grafting. Osteogenesis, osteoinduction, osteoconduction, mechanical supports are the four basic mechanisms of bone graft. Bone graft can be harvested from the iliac crest, proximal tibia, proximal humerus, proximal femur, ribs and sternum. An ideal bone graft material is biologically inert, source of osteogenic, act as a mechanical support, readily available, easily adaptable in terms of size, shape, length and replaced by the host bone. Except blood, bone is grafted with greater frequency. Bone graft indicated for variety of orthopedic abnormalities, comminuted fractures, delayed unions, non-unions, arthrodesis and osteomyelitis. Bone graft can be harvested from the iliac crest, proximal tibia, proximal humerus, proximal femur, ribs and sternum. By adopting different procedure of graft preservation its antigenicity can be minimized. The concept of bone banking for obtaining bone grafts and implants is very useful for clinical application. Absolute stability require for successful incorporation. Ideal bone graft must possess osteogenic, osteoinductive and osteocon-ductive properties. Cancellous bone graft is superior to cortical bone graft. Usually autologous cancellous bone graft are used as fresh grafts where as allografts are employed as an alloimplant. None of the available type of bone grafts possesses all these properties therefore, a single type of graft cannot be recomm-ended for all types of orthopedic abnormalities. Bone grafts and implants can be selected as per clinical problems, the equipments available and preference of

  19. Optimizing lithium dosing in hemodialysis

    DEFF Research Database (Denmark)

    Bjarnason, N H; Munkner, R; Kampmann, J P

    2006-01-01

    in which we developed an algorithm based on a 2-compartment distribution without elimination. The GFR estimate led to plasma concentrations 3-4 times lower than those anticipated. In contrast, the estimates based on V(d) and the algorithm derived from pharmacokinetic modeling led to comparable loading dose...... estimates. Furthermore, the maintenance dose estimated from the central compartment (V1) led to plasma concentrations within the therapeutic range. Thus, a regimen where 12.2 mmol lithium was given after each hemodialysis session resulted in stable between-dialysis plasma lithium concentrations...

  20. Synthetic oils

    Science.gov (United States)

    Hatton, R. E.

    1973-01-01

    Synthetic lubricants are discussed by chemical class and their general strengths and weaknesses in terms of lubrication properties are analyzed. Comparative ratings are given for 14 chemical classes and are used as a guide for lubricant selection. The effects of chemical structure on the properties of the lubricant are described with special emphasis on thermal stability. The diversity of synthetic lubricants which is provided by the wide range of properties permits many applications, some of which are reported.

  1. Transabdominal sacrocolpopexy with autologous rectus fascia graft.

    Science.gov (United States)

    Abraham, Nitya; Quirouet, Adrienne; Goldman, Howard B

    2016-08-01

    Extrusion and infection are potential postoperative complications when using synthetic mesh for abdominal sacrocolpopexy. Long-term follow-up in the Colpopexy and Urinary Reduction Efforts (CARE) trial revealed an estimated 9.9 % risk of mesh extrusion. There are 26 reports of spondylodiscitis after sacrocolpopexy with synthetic mesh. These surgical risks may be decreased by using autologous fascia. To date, there have been no reports of extrusion or spondylodiscitis after using autologous fascia for sacrocolpopexy. This video demonstrates transabdominal sacrocolpopexy with an autologous rectus fascia graft. A 76-year-old woman with symptomatic stage 3 prolapse also had a history of diverticulitis and sigmoid abscess requiring sigmoid colectomy with end colostomy and incidental left ureteral transection with subsequent left nephrostomy tube placement. She presented for colostomy reversal, ureteral reimplantation, and prolapse repair. Given the need for concomitant colon and ureteral reconstruction, the risk of infection was potentially higher if synthetic mesh were used. The patient therefore underwent transabdominal sacrocolpopexy with autologous rectus fascia graft. At 4 months' follow-up the patient reported resolution of her symptoms and on examination she had no pelvic organ prolapse. Transabdominal sacrocolpopexy using autologous rectus fascia graft is a feasible option, especially in cases in which infection and synthetic mesh extrusion risks are potentially higher.

  2. Efficacy of interferon for chronic hepatitis C virus-related hepatitis in kidney transplant candidates on hemodialysis: results after transplantation.

    Science.gov (United States)

    Casanovas-Taltavull, T; Baliellas, C; Benasco, C; Serrano, T T; Casanova, A; Pérez, J L; Guerrero, L; González, M T; Andres, E; Gil-Vernet, S; Casais, L A

    2001-04-01

    Interferon-alpha (IFN) may have undesirable effects on a functioning graft. The aim of this study was to evaluate IFN treatment in kidney transplant candidates during the hemodialysis period as well as the results after transplantation. A total of 29 noncirrhotic hemodialysis patients with chronic hepatitis C virus (HCV) infection (based on long-term rise in ALT, HCV serology, HCV RNA by polymerase chain reaction methods, and histological evidence) were included. Tolerability to IFN treatment, pre- and posttransplantation therapeutic results, and long-term outcome were recorded. IFN regimen consisted of 3 million units (MU) times per week after hemodialysis sessions for 6 months, followed by 1.5 MU after each hemodialysis session for an additional 6 months. All patients gave informed consent for participation. IFN therapy was fairly well tolerated. Adverse effects due to IFN toxicity, renal disease, or causes related to the immunological properties of IFN were observed in 24% of patients. At the end of treatment, ALT had normalized in 23/28 patients (82.1%), and HCV RNA had cleared in 23/28 patients (82.1%). During follow-up, HCV RNA was persistently negative in 18 patients (64%, including transplant recipients). A total of 14 patients (nine HCV RNA-negative) received a kidney transplant. Mean follow-up after the procedure was 41 +/- 28 months. In all, 12 patients had a functioning graft, one had acute vascular rejection, and one died of carcinoma. All transplanted patients maintained normal ALT levels, and eight remained HCV RNA-negative. Treatment results in our study population were better than those observed in the general population. The long-term response achieved, which was maintained after transplantation, supports the use of IFN for HCV hepatitis in kidney transplant candidates under hemodialysis.

  3. [Dementia and hemodialysis (author's transl)].

    Science.gov (United States)

    Bustamante Bustamante, J; Suliman Jabary, N; Jimeno Carruez, A; Palencia García, A

    1979-01-25

    The authors present a 60-year-old patient undergoing periodic hemodialysis who, 3 years after beginning the treatment, developed a clinical picture consisting of disturbances of language, motor dispraxia, loss of memory and concentration, irritability, great change of personality, myoclonias and asterixis. This led progressively to a total loss of motor coordination, including speech. He died 5 months later in a state of dementia, psychosis and incontinence of sphincters. The symptomatology increased after hemodialysis sessions. The normal analytical studies carried out in these cases (electrocardiogram, electromyography, complete roentgenologic study) and also Zn, Cu, and ceruloplasmin measurements were normal. The electroencephalogram showed only a slow tracing with delta waves. Various etiopathogenic possibilities are commented on, as for example alterations in the dialysis water, the use of detergents in cleaning the artificial kidney, a syndrome of imbalance, a decrease in the body potassium and poisoning caused by certain metals such as tin, zinc and aluminium or by drugs which contain benzodiazepine derivatives. The authors conclude that the picture corresponds to a metabolic encephalopathy.

  4. Grafting and curing

    International Nuclear Information System (INIS)

    Garnett, J.L.; Loo-Teck Ng; Visay Viengkhou

    1998-01-01

    Progress in radiation grafting and curing is briefly reviewed. The two processes are shown to be mechanistically related. The parameters influencing yields are examined particularly for grafting. For ionising radiation grafting systems (EB and gamma ray) these include solvents, substrate and monomer structure, dose and dose-rate, temperature and more recently role of additives. In addition, for UV grafting, the significance of photoinitiators is discussed. Current applications of radiation grafting and curing are outlined. The recent development of photoinitiator free grafting and curing is examined as well as the potential for the new excimer laser sources. The future application of both grafting and curing is considered, especially the significance of the occurrence of concurrent grafting during cure and its relevance in environmental considerations

  5. Serum trypsin inhibitory capacity in hemodialysis patients

    International Nuclear Information System (INIS)

    Hashemi, Mohammad; Mehrabifar, Hamid; Homayooni, Fatemeh; Naderi, Mohammad; Montazerifar, Farzaneh; Ghavami, Saeid

    2009-01-01

    It has been established that overproduction of reactive oxygen species (ROS) occurs during hemodialysis causing oxidation of proteins. Alpha-1-antitrypsin is the major circulating anti-protease which contains methionine in the active site. The aim of the present study was to measure the level of serum trypsin inhibitory capacity (sTIC) in hemodialysis patients. This case-control study was performed in 52 hemodialysis patients and 49 healthy controls. sTIC was measured by enzymatic assay. The sTIC was significantly (P< 0.001) lower in hemodialysis patients (1.87 + - 0.67 micron mol/min/mL) than healthy controls (2.83 + - 0.44 micron mol/min/L). Reduction of sTIC may be due to the oxidation of methionine residue in the reactive site of alpha-1 antitrypsin. (author)

  6. Dissecting aortic aneurysm in maintenance hemodialysis patients

    Directory of Open Access Journals (Sweden)

    Ounissi M

    2009-01-01

    Full Text Available The dissecting aortic aneurysm (DAA is a rare pathology that may result in fatal outcome. We report follow up of three cases of DAA patients undergoing maintenance hemo-dialysis who were managed conservatively.

  7. Synthetic environments

    Science.gov (United States)

    Lukes, George E.; Cain, Joel M.

    1996-02-01

    The Advanced Distributed Simulation (ADS) Synthetic Environments Program seeks to create robust virtual worlds from operational terrain and environmental data sources of sufficient fidelity and currency to interact with the real world. While some applications can be met by direct exploitation of standard digital terrain data, more demanding applications -- particularly those support operations 'close to the ground' -- are well-served by emerging capabilities for 'value-adding' by the user working with controlled imagery. For users to rigorously refine and exploit controlled imagery within functionally different workstations they must have a shared framework to allow interoperability within and between these environments in terms of passing image and object coordinates and other information using a variety of validated sensor models. The Synthetic Environments Program is now being expanded to address rapid construction of virtual worlds with research initiatives in digital mapping, softcopy workstations, and cartographic image understanding. The Synthetic Environments Program is also participating in a joint initiative for a sensor model applications programer's interface (API) to ensure that a common controlled imagery exploitation framework is available to all researchers, developers and users. This presentation provides an introduction to ADS and the associated requirements for synthetic environments to support synthetic theaters of war. It provides a technical rationale for exploring applications of image understanding technology to automated cartography in support of ADS and related programs benefitting from automated analysis of mapping, earth resources and reconnaissance imagery. And it provides an overview and status of the joint initiative for a sensor model API.

  8. Hemodialysis patients' perceptions of home hemodialysis and self-care.

    Science.gov (United States)

    Visaya, Marie Angela

    2010-01-01

    Home hemodialysis (HHD) is an optimal option for patients requiring renal replacement therapy. It has been noted through research that this type of therapy is more cost-effective than in-centre therapies, and the benefits to patients are well documented (Harwood & Leitch, 2006). As stated by the Ministry of Health and Long-Term Care (MoHLTC), a total of 40% of renal failure patients are expected to do home dialysis (either peritoneal dialysis or HHD) by the year 2010 (Kashani & Motiwala, 2007). Even though the literature indicates that the numbers of those doing home dialysis are declining every year, there is no evidence to demonstrate why the numbers are declining. A quantitative cross-sectional descriptive study was conducted using the Patient Perception Survey and the Jo Pre-Training Assessment Tool (JPAT) to assess in-centre hemodialysis patients' perceptions regarding home dialysis, as well as their self-care ability. The two frameworks utilized were the Theory of Planned Behavior and Orem's Theory of Self-Care. According to the Theory of Planned Behavior, the 26 patients out of 49 who had positive perceptions regarding home dialysis would be expected to participate in home dialysis. However, according to the patients' responses to the domains within the JPAT, only eight out of the 26 would be considered suitable to participate in home dialysis. Only two of the domains, communication and social support, were found to be significantly related to patients'perceptions regarding home dialysis. Health care professionals need to implement interventions that incorporate assessment of communication and social support when addressing home dialysis therapy with a patient with end-stage renal disease (ESRD).

  9. Bone grafts in dentistry

    Directory of Open Access Journals (Sweden)

    Prasanna Kumar

    2013-01-01

    Full Text Available Bone grafts are used as a filler and scaffold to facilitate bone formation and promote wound healing. These grafts are bioresorbable and have no antigen-antibody reaction. These bone grafts act as a mineral reservoir which induces new bone formation.

  10. Hemodialysis vascular access options after failed Brescia-Cimino arteriovenous fistula

    Directory of Open Access Journals (Sweden)

    Aneesh Srivastava

    2011-01-01

    Full Text Available The survival of patients on long-term hemodialysis has improved. End-stage renal disease patients now need maintenance of their vascular access for much longer periods. Arteriovenous fistulae formed at the wrist are the first choice for this purpose, but, in many patients, these fistulae fail over time or are not feasible because of thrombosed veins. We searched the Pubmed database to evaluate the various options of vascular access in this group of patients based on the published literature. It is quite evident that, whenever possible, autogenous fistulae should be preferred over prosthetic grafts. Use of upper arm cephalic and basilic veins with transpositions wherever required can enhance autogenous fistula options to a large extent. Upper arm grafts should be used when no autogenous fistula is possible. Lower limb and body wall fistula sites are to be considered at the end, when all options in both upper limbs are exhausted.

  11. Modification of polyetherurethane for biomedical application by radiation induced grafting. II. Water sorption, surface properties, and protein adsorption of grafted films

    International Nuclear Information System (INIS)

    Jansen, B.; Ellinghorst, G.

    1984-01-01

    A series of polyetherurethane films grafted by means of gamma radiation with hydrophilic or reactive monomers (2-hydroxyethyl methacrylate, 2,3-epoxypropyl methacrylate, 2,3-dihydroxypropyl methacrylate, and acrylamide) and partially chemically modified were subjected to various physico-chemical investigation methods involving water sorption, contact angle, and protein adsorption measurements. From contact angle data the interfacial free energy gamma sw between grafted films and water was calculated. It was found that the water uptake of grafted films increases with grafting yield or, in the case of grafted and afterwards chemically modified films, with reaction yield; the diffusion coefficient of water in the modified films also increases with grafting yield. Contact angle studies revealed all grafted films to have surfaces more hydrophilic than the ungrafted trunk polymer. The degree of hydrophilicity--especially of HEMA-grafted films--strongly depends on grafting conditions. For some grafted samples with high surface hydrophilicity very low interfacial free energies approaching zero were measured. The study of the competitive adsorption of bovine serum albumin, gamma-globulin, and fibrinogen from a synthetic protein solution onto modified films showed that the adsorption of albumin increases markedly with increasing grafting yields, whereas the fibrinogen and gamma-globulin adsorption only slightly increases. A correlation between interfacial free energy and protein adsorption in the sense of the minimum interfacial free energy hypothesis was found only for samples with grafting yields below 5%. At higher grafting yields the increased surface area complicates the analysis

  12. An unusual case of an irretrievable hemodialysis catheter in a patient with end stage renal disease.

    Science.gov (United States)

    Ghahremani-Ghajar, Mehrdad; Jin, Anna; Borghei, Peyman; Chen, Joline L T

    2018-01-01

    Hemodialysis catheters are associated with higher risks of complications compared to arteriovenous fistulas and grafts. Some common complications of dialysis catheters include infection, thrombus formation, central venous stenosis, and mechanical dysfunction. Rarely, catheters can become firmly adhered to a vessel wall. Catheter adhesion is a serious complication that can impact the delivery of safe and effective dialysis to affected patients. Adherent catheters commonly present insidiously with no overt diagnostic signs and symptoms or antecedent catheter malfunction. Prognosis is variable, but can be potentially fatal depending on the severity of adhesion, and sequelae of complications. There are no standardized methods of therapy and treatment strategies are anecdotally reported by interventional radiology, vascular, and cardiothoracic surgery. We hereby describe a case of hemodialysis catheter that has become firmly embedded within the superior vena cava wall. We review the available literature on the epidemiology, risk factors, long-term sequelae, and known management strategies of adherent catheters. The development of preventative measures will be of great importance given serious complications and limited treatment options. Clinical awareness and understanding of this rare condition is imperative to the prevention and management of adherent catheters. © 2017 International Society for Hemodialysis.

  13. Dynamic, nondestructive imaging of a bioengineered vascular graft endothelium.

    Directory of Open Access Journals (Sweden)

    Bryce M Whited

    Full Text Available Bioengineering of vascular grafts holds great potential to address the shortcomings associated with autologous and conventional synthetic vascular grafts used for small diameter grafting procedures. Lumen endothelialization of bioengineered vascular grafts is essential to provide an antithrombogenic graft surface to ensure long-term patency after implantation. Conventional methods used to assess endothelialization in vitro typically involve periodic harvesting of the graft for histological sectioning and staining of the lumen. Endpoint testing methods such as these are effective but do not provide real-time information of endothelial cells in their intact microenvironment, rather only a single time point measurement of endothelium development. Therefore, nondestructive methods are needed to provide dynamic information of graft endothelialization and endothelium maturation in vitro. To address this need, we have developed a nondestructive fiber optic based (FOB imaging method that is capable of dynamic assessment of graft endothelialization without disturbing the graft housed in a bioreactor. In this study we demonstrate the capability of the FOB imaging method to quantify electrospun vascular graft endothelialization, EC detachment, and apoptosis in a nondestructive manner. The electrospun scaffold fiber diameter of the graft lumen was systematically varied and the FOB imaging system was used to noninvasively quantify the affect of topography on graft endothelialization over a 7-day period. Additionally, results demonstrated that the FOB imaging method had a greater imaging penetration depth than that of two-photon microscopy. This imaging method is a powerful tool to optimize vascular grafts and bioreactor conditions in vitro, and can be further adapted to monitor endothelium maturation and response to fluid flow bioreactor preconditioning.

  14. Rosuvastatin in diabetic hemodialysis patients

    DEFF Research Database (Denmark)

    Holdaas, Hallvard; Holme, Ingar; Schmieder, Roland E

    2011-01-01

    group had more hemorrhagic strokes than the placebo group (12 versus two strokes, respectively; HR, 5.21; 95% CI 1.17 to 23.27). Rosuvastatin treatment significantly reduced the rates of cardiac events by 32% among patients with diabetes (HR 0.68; 95% CI 0.51 to 0.90). In conclusion, among hemodialysis...... for cardiac events. Assignment to rosuvastatin associated with a nonsignificant 16.2% reduction in risk for the AURORA trial's composite primary endpoint of cardiac death, nonfatal MI, or fatal or nonfatal stroke (HR 0.84; 95% CI 0.65 to 1.07). There was no difference in overall stroke, but the rosuvastatin...

  15. Synthetic Rutile

    International Nuclear Information System (INIS)

    Burastero, J.

    1975-01-01

    This work is about the laboratory scale investigation of the conditions in the rutile synthetic production from one me nita in Aguas Dulces reservoir. The iron mineral is chlorinated and volatilized selectively leaving a residue enriched in titanium dioxide which can be used as a substitute of rutile mineral

  16. Influence of Frequent Nocturnal Home Hemodialysis on Food Preference

    NARCIS (Netherlands)

    Ipema, Karin; Franssen, Casper; van der Schans, Cees; Smit, Lianne; Noordman, Sabine; Haisma, Hinke

    Objective: Dialysis patients frequently report a change of taste that is reversible after renal transplantation, suggesting that uremic toxins may negatively influence taste. Currently, frequent nocturnal home hemodialysis (NHHD) is the most effective method of hemodialysis, and is associated with

  17. Experience with the GENIUS hemodialysis system.

    Science.gov (United States)

    Fassbinder, Winfried

    2003-01-01

    The late B. Tersteegen devised a clever way to combine the advantages of a closed tank hemodialysis system with the efficacy and bacteriological safety of a single-pass system. The Teerstegen equipment is now marketed as the GENIUS hemodialysis system. For each treatment, fresh dialysis fluid is prepared according to the physician's prescription by mixing sterile ingredients (electrolytes and glucose) with preheated ultrapure water. The total amount of dialysis fluid is put into a thermally insulated glass tank (volume 75 l) of the hemodialysis machine. The filling and emptying process is completely automated. An UV radiator is used for desinfection. Due to a consequent hygienic concept, the system operates with an almost sterile and usually pyrogen-free dialysis fluid. During treatment, fresh dialysis fluid is taken from the top of the system, and the used dialysate is returned to the bottom. There is a sharp interface between the fresh and used dialysis fluids because of a small difference in temperature (1 degrees C). True volumetric ultrafiltration control is simply achieved; ultrafiltration rates between 100 and 1,000 ml/h can be selected as considered appropriate by the physician. We cultured more than 2,000 dialysate specimens to examine bacterial contamination, and found either no bacterial growth at all (in the vast majority of the cases) or less than 1 CFU/ml dialysate. We have utilized the GENIUS system since 1994. Meanwhile, more than 40,000 treatments have been performed in our center. Biochemical results of the first 19 stable hemodialysis patients (mean age 66 years, range 45-82), who had been treated with conventional hemodialysis systems for at least 6 months (range 6-157) before changing to GENIUS, were evaluated. We observed an increase of mean serum albumin concentration from 4.1 (+/-0.4 SD) g/dl to 4.8 (+/-0.3) g/dl (p < 0.01) within 6 months. Most patients reported improved well-being. Of these 19 patients, 18 preferred further treatment with

  18. What Is Known and Unknown About Twice-Weekly Hemodialysis

    OpenAIRE

    Obi, Yoshitsugu; Eriguchi, Rieko; Ou, Shuo-Ming; Rhee, Connie M.; Kalantar-Zadeh, Kamyar

    2015-01-01

    © 2015 S. Karger AG, Basel. Background: The 2006 Kidney Disease Outcomes Quality Initiative guidelines suggest twice-weekly or incremental hemodialysis for patients with substantial residual kidney function (RKF). However, in most affluent nations de novo and abrupt transition to thrice-weekly hemodialysis is routinely prescribed for all dialysis-naïve patients regardless of their RKF. We review historical developments in hemodialysis therapy initiation and revisit twice-weekly hemodialysis a...

  19. Hemodialysis

    Science.gov (United States)

    ... protein intake and limit the amount of potassium, phosphorus, sodium, and fluid in their diet. Patients with ... Can dialysis patients travel? Yes. Dialysis centers are located in every part of the United States and ...

  20. Pulmonary Hypertension Among End-Stage Renal Failure Patients Following Hemodialysis Access Thrombectomy

    International Nuclear Information System (INIS)

    Harp, Richard J.; Stavropoulos, S. William; Wasserstein, Alan G.; Clark, Timothy W.I.

    2005-01-01

    Purpose: Percutaneous hemodialysis thrombectomy causes subclinical pulmonary emboli without short-term clinical consequence; the long-term effects on the pulmonary arterial vasculature are unknown. We compared the prevalence of pulmonary hypertension between patients who underwent one or more hemodialysis access thrombectomy procedures with controls without prior thrombectomy.Methods: A retrospective case-control study was performed. Cases (n = 88) had undergone one or more hemodialysis graft thrombectomy procedures, with subsequent echocardiography during routine investigation of comorbid cardiovascular disease. Cases were compared with controls without end-stage renal disease (ESRD) (n = 100, group 1), and controls with ESRD but no prior thrombectomy procedures (n = 117, group 2). The presence and velocity of tricuspid regurgitation on echocardiography was used to determine the prevalence and grade of pulmonary hypertension; these were compared between cases and controls using the chi-square test and logistic regression.Results: The prevalence of pulmonary hypertension among cases was 52% (46/88), consisting of mild, moderate and severe in 26% (n = 23), 10% (n = 9) and 16% (n = 14), respectively. Prevalence of pulmonary hypertension among group 1 controls was 26% (26/100), consisting of mild, moderate and severe pulmonary hypertension in 14%, 5% and 7%, respectively. Cases had 2.7 times greater odds of having pulmonary hypertension than group 1 controls (p = 0.002). The prevalence of pulmonary hypertension among group 2 controls was 42% (49/117), consisting of mild, moderate and severe pulmonary arterial hypertension in 25% (n = 49), 10% (n = 12) and 4% (n = 5), respectively. Cases were slightly more likely to have pulmonary hypertension than group 2 controls (OR = 1.5), although this failed to reach statistical significance (p = 0.14).Conclusion: Prior hemodialysis access thrombectomy does not appear to be a risk factor for pulmonary arterial hypertension

  1. The Effect of Frequent Hemodialysis on Nutrition and Body Composition: Frequent Hemodialysis Network Trial

    Science.gov (United States)

    Kaysen, George A.; Greene, Tom; Larive, Brett; Mehta, Ravindra, L.; Lindsay, Robert; Depner, Tom A.; Hall, Yoshio N.; Daugirdas, John T.; Chertow, Glenn M.

    2012-01-01

    We investigated the effects of frequency of hemodialysis on nutritional status by analyzing the data in the Frequent Hemodialysis Network Trial. We compared changes in albumin, body weight and composition among 245 patients randomized to 6- or 3-times per week in-center hemodialysis (Daily Trial) and 87 patients randomized to 6-times per week nocturnal or 3-times per week conventional hemodialysis, performed largely at home (Nocturnal Trial). In the Daily Trial, there were no significant differences between groups in changes in serum albumin or the equilibrated protein catabolic rate by 12 months. There was a significant relative decrease in pre-dialysis body weight of 1.5 ± 0.2 kg in the 6 times per week group at one month, but this significantly rebounded by 1.3 ± 0.5 kg over the remaining 11 months. Extracellular water decreased in the 6 times per week compared to the 3 per week hemodialysis group. There were no significant between-group differences in phase angle, intracellular water or body cell mass. In the Nocturnal Trial, there were no significant between-group differences in any study parameter. Any gain in “dry” body weight corresponded to increased adiposity rather than muscle mass but was not statistically significant. Thus, frequent in-center hemodialysis reduced extracellular water but did not increase serum albumin or body cell mass while frequent nocturnal hemodialysis yielded no net effect on parameters of nutritional status or body composition. PMID:22456602

  2. The cost of hemodialysis in a large hemodialysis center

    Directory of Open Access Journals (Sweden)

    Khalid Al Saran

    2012-01-01

    Full Text Available To assess the cost of hemodialysis (HD delivered at our center according to the treatment protocols based on the current Kidney Disease Outcome Quality Initiative (K/DOQI guidelines, we analyzed our cost data during the period from 1st of January 2007 to 30th of June 2010. The methods were used to determine both direct costs (related to dialysis treatment such as dialysis disposables, dialysis related drugs, medical personnel, out-patient medications, laboratory and other ancillary services and overhead costs (building, maintenance and engineering costs, housekeeping, and administrative personnel. During the study period, an average of 2,500 HD sessions per month were performed for 200 patients. The mean total cost per HD session was calculated as 297 US dollars (USD [1,114 Saudi Riyals (SR], and the mean total cost of dialysis per patient per year was 46,332 USD (173,784 SR. Direct costs contributed to 81.15% of the total cost from which the personnel cost represented 41.11% and dialysis disposables represented 13.64%, while medications (outpatient and intravenous dialysis related medications including albumin, erythropoiesis stimulating agents, iron and vitamin D3 accounted for 12.47% of the total cost. Our total cost level is well below the average cost in the industrialized countries.

  3. Severe Valproic Acid Intoxication Responding to Hemodialysis

    Directory of Open Access Journals (Sweden)

    Ali Ertuğ Arslanköylü

    2017-08-01

    Full Text Available Valproic acid is a commonly used antiepileptic drug which causes intoxication easily due to its narrow therapeutic window. Here, we present a child with valproic acid poisoning who responded to hemodialysis. A 14-year-old male patient with epilepsy and mental motor retardation was admitted to the pediatric intensive care unit due to valproic acid intoxication. Plasma valproic acid level was 710 µg/mL. The patient’s vital signs were stable and a decrease was observed in the valproic acid and ammonia levels with supportive treatment at the beginning. On the third day of the admission, hemodynamic and mental status of the patient deteriorated, plasma ammonia and lactate levels elevated, thus, we decided to perform hemodialysis. After hemodialysis, the patient’s hemodynamic status and mental function improved in conjunction with the reduction in valproic acid, ammonia and lactate levels. Thus he was transferred to the pediatric ward. Hemodialysis may be considered an effective treatment choice for severe valproic acid intoxication. Here, it was shown that hemodialysis may also be effective in patients with deteriorated general status under supportive treatment in the late phase of valproic acid intoxication.

  4. Home hemodialysis associated infection-The "Achilles' Heel" of intensive hemodialysis.

    Science.gov (United States)

    Poon, Clara K; Chan, Christopher T

    2017-04-01

    Home hemodialysis (HHD) is emerging as an important alternate renal replacement therapy. Although there are multiple clinical advantages with HHD, concerns surrounding increased risks of infection in this group of patients remain a major barrier to its implementation. In contrast to conventional hemodialysis, infection related complication represents the major morbidity in this mode of renal replacement therapy. Vascular access related infection is an important cause of infection in this population. Use of central vein catheters and buttonhole cannulation in HHD are important modifiable risk factors for HHD associated infection. Several preventive measures are suggested in the literature, which will require further prospective validation. © 2016 International Society for Hemodialysis.

  5. Massive hemorrhage due to hemodialysis-associated thrombocytopenia.

    Science.gov (United States)

    Vicks, S L; Gross, M L; Schmitt, G W

    1983-01-01

    Marked declines in platelet numbers were noted in association with hemodialysis. This resulted in gastrointestinal bleeding and the need for packed RBC and platelet transfusions. This hemodialysis-associated thrombocytopenia was ameliorated by changing the dialyzer in use. The gastrointestinal bleeding stopped and the need for platelet transfusions was obviated. The degree of platelet loss during hemodialysis is probably affected by the composition of the dialyzer membrane used as well as other factors. Hemodialysis-associated thrombocytopenia may be a contributing factor in the increased bleeding tendency noted in hemodialysis patients.

  6. Prevalence of fibromyalgia in hemodialysis patients.

    Science.gov (United States)

    Samimagham, Hamidreza; Haghighi, Anousheh; Tayebi, Mehdi; Jenabi, Arya; Arabi, Mohsen; Kianmehr, Nahid

    2014-05-01

    This study sought to determine the prevalence of fibromyalgia syndrome and to identify whether fibromyalgia was associated with various clinical symptoms and laboratory parameters in hemodialysis patients. One hundred and forty-eight hemodialysis patients were examined for fibromyalgia symptoms according to the American College of Rheumatology criteria. Demographic characteristics, as well as causes of kidney failure, dialysis duration, and symptoms related to fibromyalgia were investigated. Of 148 patients, 18 (12.2%) were diagnosed with fibromyalgia. Patients with fibromyalgia had significantly poorer sleeping satisfaction than the control group (P = .02).The Beck Depression Inventory score was higher in 77.8% of the fibromyalgia patients than that in the control group (P = .006), but there was no significant difference in the anxiety score between the two groups (P = .86).In conclusion, there was a higher prevalence of fibromyalgia in hemodialysis patients than previously reported. Sleep disturbances and depression levels correlated with fibromyalgia.

  7. Hemodialysis in the Poisoned Patient

    Directory of Open Access Journals (Sweden)

    Megan Boysen-Osborn

    2017-09-01

    Full Text Available Audience: This classic team based learning (cTBL didactic is aimed for emergency medicine residents and fourth year medical students entering emergency medicine. Introduction: Over one million visits per year to United States (US emergency departments (ED are related to poisonings.1 Extracorporeal treatment (ECTR, specifically hemodialysis (HD, is one potential method to enhance elimination of certain drugs and their toxic metabolites.2-12 While HD may be life-saving in certain poisonings, it may have no effect on others and it carries associated risks and costs. It is essential that emergency physicians know the indications for HD in the poisoned patient. This cTBL reviews many poisonings which may be managed by HD. Objectives: By the end of this cTBL, the learner will: 1 recognize laboratory abnormalities related to toxic alcohol ingestion; 2 calculate an anion gap and osmolal gap; 3 know the characteristics of drugs that are good candidates for HD; 4 discuss the management of patients with toxic alcohol ingestions; 5 discuss the management of patients with salicylate overdose; 6 know the indications for HD in patients with overdoses of antiepileptic drugs; 7 discuss the management of patients with lithium toxicity. Method: This didactic session is a cTBL (classic team based learning.

  8. Home and medical center hemodialysis. Dollar comparison and payback period.

    Science.gov (United States)

    Delano, B G; Feinroth, M V; Feinroth, M; Friedman, E A

    1981-07-17

    Cost of home hemodialysis training was compared with that of continuing hemodialysis at a satellite medical center. The "payback period" was defined as the time after which higher home training and start-up charges equaled and were surpassed by the initially lower satellite charges. This period was 14.4 months. Total cost of home hemodialysis training and start-up at our institution was $15,149.32. Ambulatory medical center hemodialysis during the same period (3 1/2 months) was $6,853.58. Initially, therefore, the cost of home dialysis is $8,295.74 more. However, after 14.4 months, there is an equalization point subsequent to which home hemodialysis costs $7,472.40 less each year. For a subgroup of patients, those with malignant and severe systemic diseases with reduced survival with hemodialysis, home hemodialysis has no economic advantage.

  9. Osseous scintigraphy and auxiliary graft

    International Nuclear Information System (INIS)

    Khelifa, F.; Siles, S.; Puech, B.

    1992-01-01

    The scintigraphy could be a good way to survey the osseous graft: three cases are studied in which were recognized the presence of a graft, surinfection, graft lysis, pseudo-arthrosis, algodystrophy. 8 refs., 5 figs

  10. Meniscal allograft transplantation. Part 1: systematic review of graft biology, graft shrinkage, graft extrusion, graft sizing, and graft fixation.

    Science.gov (United States)

    Samitier, Gonzalo; Alentorn-Geli, Eduard; Taylor, Dean C; Rill, Brian; Lock, Terrence; Moutzouros, Vasilius; Kolowich, Patricia

    2015-01-01

    To provide a systematic review of the literature regarding five topics in meniscal allograft transplantation: graft biology, shrinkage, extrusion, sizing, and fixation. A systematic literature search was conducted using the PubMed (MEDLINE), ScienceDirect, and EBSCO-CINAHL databases. Articles were classified only in one topic, but information contained could be reported into other topics. Information was classified according to type of study (animal, in vitro human, and in vivo human) and level of evidence (for in vivo human studies). Sixty-two studies were finally included: 30 biology, 3 graft shrinkage, 11 graft extrusion, 17 graft size, and 6 graft fixation (some studies were categorized in more than one topic). These studies corresponded to 22 animal studies, 22 in vitro human studies, and 23 in vivo human studies (7 level II, 10 level III, and 6 level IV). The principal conclusions were as follows: (a) Donor cells decrease after MAT and grafts are repopulated with host cells form synovium; (b) graft preservation alters collagen network (deep freezing) and causes cell apoptosis with loss of viable cells (cryopreservation); (c) graft shrinkage occurs mainly in lyophilized and gamma-irradiated grafts (less with cryopreservation); (d) graft extrusion is common but has no clinical/functional implications; (e) overall, MRI is not superior to plain radiograph for graft sizing; (f) graft width size matching is more important than length size matching; (g) height appears to be the most important factor influencing meniscal size; (h) bone fixation better restores contact mechanics than suture fixation, but there are no differences for pullout strength or functional results; and (i) suture fixation has more risk of graft extrusion compared to bone fixation. Systematic review of level II-IV studies, Level IV.

  11. Synthetic Cannabinoids.

    Science.gov (United States)

    Mills, Brooke; Yepes, Andres; Nugent, Kenneth

    2015-07-01

    Synthetic cannabinoids (SCBs), also known under the brand names of "Spice," "K2," "herbal incense," "Cloud 9," "Mojo" and many others, are becoming a large public health concern due not only to their increasing use but also to their unpredictable toxicity and abuse potential. There are many types of SCBs, each having a unique binding affinity for cannabinoid receptors. Although both Δ-tetrahydrocannabinol (THC) and SCBs stimulate the same receptors, cannabinoid receptor 1 (CB1) and cannabinoid receptor 2 (CB2), studies have shown that SCBs are associated with higher rates of toxicity and hospital admissions than is natural cannabis. This is likely due to SCBs being direct agonists of the cannabinoid receptors, whereas THC is a partial agonist. Furthermore, the different chemical structures of SCBs found in Spice or K2 may interact in unpredictable ways to elicit previously unknown, and the commercial products may have unknown contaminants. The largest group of users is men in their 20s who participate in polydrug use. The most common reported toxicities with SCB use based on studies using Texas Poison Control records are tachycardia, agitation and irritability, drowsiness, hallucinations, delusions, hypertension, nausea, confusion, dizziness, vertigo and chest pain. Acute kidney injury has also been strongly associated with SCB use. Treatment mostly involves symptom management and supportive care. More research is needed to identify which contaminants are typically found in synthetic marijuana and to understand the interactions between different SBCs to better predict adverse health outcomes.

  12. Advances in radiation grafting

    International Nuclear Information System (INIS)

    Hegazy, El-Sayed A.; AbdEl-Rehim, H.A.; Kamal, H.; Kandeel, K.A.

    2001-01-01

    Graft copolymerization is an attractive means for modifying base polymers because grafting frequently results in the superposition of properties relating to the backbone and pendent chains. Among the various methods for initiating the grafting reaction, ionizing radiation is the cleanest and most versatile method of grafting available. Ion-exchange membranes play an important role in modern technology, especially in separation and purification of materials. The search for improved membrane composition has considered almost every available polymeric material because of its great practical importance. Grafting of polymers with a mixture of monomers is important since different types of chains containing different functional groups are included. A great deal is focused on the waste treatment of heavy and toxic metals from wastewater because of the severe problems of environmental pollution. Functionalized polymers suitable for metal adsorption with their reactive functional groups such as carboxylic and pyridine groups suitable for waste treatment were prepared by radiation grafting method. More reactive chelating groups were further introduced to the grafted copolymer through its functional groups by chemical treatments with suitable reagents. The advances of radiation grafting and possible uses are briefly discussed

  13. Calcar bone graft

    Energy Technology Data Exchange (ETDEWEB)

    Bargar, W.L.; Paul, H.A.; Merritt, K.; Sharkey, N.

    1986-01-01

    A canine model was developed to investigate the use of an autogeneic iliac bone graft to treat the calcar deficiency commonly found at the time of revision surgery for femoral component loosening. Five large male mixed-breed dogs had bilateral total hip arthroplasty staged at three-month intervals, and were sacrificed at six months. Prior to cementing the femoral component, an experimental calcar defect was made, and a bicortical iliac bone graft was fashioned to fill the defect. Serial roentgenograms showed the grafts had united with no resorption. Technetium-99 bone scans showed more uptake at three months than at six months in the graft region. Disulfine blue injection indicated all grafts were perfused at both three and six months. Thin section histology, fluorochromes, and microradiographs confirmed graft viability in all dogs. Semiquantitative grading of the fluorochromes indicated new bone deposition in 20%-50% of each graft at three months and 50%-80% at six months. Although the calcar bone graft was uniformly successful in this canine study, the clinical application of this technique should be evaluated by long-term results in humans.

  14. Advances in radiation grafting

    Science.gov (United States)

    Hegazy, El-Sayed A.; AbdEl-Rehim, H. A.; Kamal, H.; Kandeel, K. A.

    2001-12-01

    Graft copolymerization is an attractive means for modifying base polymers because grafting frequently results in the superposition of properties relating to the backbone and pendent chains. Among the various methods for initiating the grafting reaction, ionizing radiation is the cleanest and most versatile method of grafting available. Ion-exchange membranes play an important role in modern technology, especially in separation and purification of materials. The search for improved membrane composition has considered almost every available polymeric material because of its great practical importance. Grafting of polymers with a mixture of monomers is important since different types of chains containing different functional groups are included. A great deal is focused on the waste treatment of heavy and toxic metals from wastewater because of the severe problems of environmental pollution. Functionalized polymers suitable for metal adsorption with their reactive functional groups such as carboxylic and pyridine groups suitable for waste treatment were prepared by radiation grafting method. More reactive chelating groups were further introduced to the grafted copolymer through its functional groups by chemical treatments with suitable reagents. The advances of radiation grafting and possible uses are briefly discussed.

  15. PRESCRIPTION AND ADEQUACY OF HEMODIALYSIS

    Directory of Open Access Journals (Sweden)

    I Gde Raka Widiana

    2013-10-01

    Full Text Available Normal 0 false false false IN X-NONE X-NONE MicrosoftInternetExplorer4 Physiologically, uremic syndrome is a pollutional phenomenone of body fluid caused by uremic substance retention due to failing kidney. Hemodialysis (HD is a substitution therapy to replace native kidney to filter out the toxic substances. The clearance capacity can be measured using urea kinetic modeling, where urea is used as a marker. Prescription of HD will produced prescribed KT/V, namely the amount of HD doses given. On the other hand delivered KT/V is real clearance effect occurred in the body. Each component of dialysis machine can be adjusted to produce adequate delivered KT/V. This KT/V has also to be adjusted with weekly frequency of HD and residual function of the native kidney. Value of KT/V in each HD session according the consensus has to be attained in order the patient live a better life longer /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;}

  16. Technical aspects of home hemodialysis

    Directory of Open Access Journals (Sweden)

    Alhomayeed B

    2009-01-01

    Full Text Available Home hemodialysis (HHD has proved to be a useful form of renal replacement therapy. The economic advantage of HHD is well established and interest in it is renewed. Once it has been decided to establish a HHD program, a well developed strategic plan is required. This should address financial and logistical issues and establish policies that will address responsi-bilities of both patients and HD centers. The recruitment of patients is facilitated by ensuring that all incident patients have early access to an education program describing all forms of renal replacement therapy that the regional renal program provides. Patients and members of the pre-dialysis education program should understand the selection process criteria in advance. Once the assessment is completed and the patient agrees to the proceedings, a plan of action should be esta-blished for enrolling the patient into the program and initiating training. Patients′ education pro-gram should take into consideration principles of adult learning. When choosing dialysis equip-ment for home use, the needs and preferences of the patients should be respected. As a rule of thumb, the equipment should be simple to use, yet still provide adequate and reliable therapy. De-ciding where to set up and position the HHD equipment is important. Installation of HHD ma-chine at home requires a continuous supply of accessories. Before establishing a HHD program, commitment of the dialysis center to provide and maintain the infrastructure of the program is mandatory. The estimated patients suitable for HHD are less than 15% of all prospective dialysis patients. Generally, those who are have greatly improved quality of life and by using modalities such as nocturnal and daily dialysis can have improved physical well-being with considerable potential cost savings.

  17. Synthetic Botany.

    Science.gov (United States)

    Boehm, Christian R; Pollak, Bernardo; Purswani, Nuri; Patron, Nicola; Haseloff, Jim

    2017-07-05

    Plants are attractive platforms for synthetic biology and metabolic engineering. Plants' modular and plastic body plans, capacity for photosynthesis, extensive secondary metabolism, and agronomic systems for large-scale production make them ideal targets for genetic reprogramming. However, efforts in this area have been constrained by slow growth, long life cycles, the requirement for specialized facilities, a paucity of efficient tools for genetic manipulation, and the complexity of multicellularity. There is a need for better experimental and theoretical frameworks to understand the way genetic networks, cellular populations, and tissue-wide physical processes interact at different scales. We highlight new approaches to the DNA-based manipulation of plants and the use of advanced quantitative imaging techniques in simple plant models such as Marchantia polymorpha. These offer the prospects of improved understanding of plant dynamics and new approaches to rational engineering of plant traits. Copyright © 2017 Cold Spring Harbor Laboratory Press; all rights reserved.

  18. Synthetic Brainbows

    KAUST Repository

    Wan, Y.

    2013-06-01

    Brainbow is a genetic engineering technique that randomly colorizes cells. Biological samples processed with this technique and imaged with confocal microscopy have distinctive colors for individual cells. Complex cellular structures can then be easily visualized. However, the complexity of the Brainbow technique limits its applications. In practice, most confocal microscopy scans use different florescence staining with typically at most three distinct cellular structures. These structures are often packed and obscure each other in rendered images making analysis difficult. In this paper, we leverage a process known as GPU framebuffer feedback loops to synthesize Brainbow-like images. In addition, we incorporate ID shuffing and Monte-Carlo sampling into our technique, so that it can be applied to single-channel confocal microscopy data. The synthesized Brainbow images are presented to domain experts with positive feedback. A user survey demonstrates that our synthetic Brainbow technique improves visualizations of volume data with complex structures for biologists.

  19. Diffusive Silicon Nanopore Membranes for Hemodialysis Applications.

    Directory of Open Access Journals (Sweden)

    Steven Kim

    Full Text Available Hemodialysis using hollow-fiber membranes provides life-sustaining treatment for nearly 2 million patients worldwide with end stage renal disease (ESRD. However, patients on hemodialysis have worse long-term outcomes compared to kidney transplant or other chronic illnesses. Additionally, the underlying membrane technology of polymer hollow-fiber membranes has not fundamentally changed in over four decades. Therefore, we have proposed a fundamentally different approach using microelectromechanical systems (MEMS fabrication techniques to create thin-flat sheets of silicon-based membranes for implantable or portable hemodialysis applications. The silicon nanopore membranes (SNM have biomimetic slit-pore geometry and uniform pores size distribution that allow for exceptional permeability and selectivity. A quantitative diffusion model identified structural limits to diffusive solute transport and motivated a new microfabrication technique to create SNM with enhanced diffusive transport. We performed in vitro testing and extracorporeal testing in pigs on prototype membranes with an effective surface area of 2.52 cm2 and 2.02 cm2, respectively. The diffusive clearance was a two-fold improvement in with the new microfabrication technique and was consistent with our mathematical model. These results establish the feasibility of using SNM for hemodialysis applications with additional scale-up.

  20. Intravenous iron supplementation in children on hemodialysis.

    NARCIS (Netherlands)

    Leijn, E.; Monnens, L.A.H.; Cornelissen, E.A.M.

    2004-01-01

    BACKGROUND: Children with end-stage renal disease (ESRD) on hemodialysis (HD) are often absolute or functional iron deficient. There is little experience in treating these children with intravenous (i.v.) iron-sucrose. In this prospective study, different i.v. iron-sucrose doses were tested in

  1. On pressure: volume relations in hemodialysis

    NARCIS (Netherlands)

    E.H.Y. Ie (Eric)

    2005-01-01

    textabstractChapter 1 is a brief introduction to several aspects of cardiovascular pressure-volume relations in dialysis patients. The aims of the thesis are presented. In Chapter 2, an overview is presented of circulatory physiology in hemodialysis (HD) patients. Volume withdrawal by

  2. Multiple Hemodialysis Access Failures Due to Recurrent ...

    African Journals Online (AJOL)

    Introduction: The most common complication of permanent hemodialysis (HD) vascular access is thrombosis, with some cases being related to a hypercoagulable state. Antiphospholipid antibody syndrome (APAS) is a cause of increased thrombotic tendency, and this may complicate the management of such patients on ...

  3. Use of hemodialysis in meprobamate overdosage.

    Science.gov (United States)

    Lobo, P I; Spyker, D; Surratt, P; Westervelt, F B

    1977-02-01

    A case of meprobamate overdosage successfully treated with hemodialysis is described. The patient was admitted 4 hours after an overdosage of meprobamate (30-40 g) deeply unconscious, hypotensive, in respiratory failure and with a serum meprobamate level of 50 mg/100 ml. Hemodialysis was instituted using a Gambro parallel flow dialyzer and a portable re-circulating dialyzate delivery system (Redy, CCi Life Systems). Meprobamate removal with hemodialysis was 672+/-167 mg/hr with a corresponding clearance of 61.97+/-9.9 ml/min. Drug removal with forced diuresis was 177+/-23.4 mg/hr. Metabolic degradation of the drug was approximately 482 mg/hr with a plasma disappearance rate of 5.2%/hr. No drug could be detected in the dialyzate fluid after its passage through the Redy re-circulating dialyzate system. Because of the rapidity of metabolic degradation of meprobamate, we feel that hemodialysis should be reserved for severe clinical intoxication and either compromised normal excretory routes or progressive clinical deterioration.

  4. Sterilization of heparinized cuprophan hemodialysis membranes

    NARCIS (Netherlands)

    ten Hoopen, Hermina W.M.; Hinrichs, W.L.J.; Hinrichs, W.L.J.; Engbers, G.H.M.; Feijen, Jan

    1996-01-01

    The effects of sterilization of dry heparinized Cuprophan hemodialysis membranes by means of ethylene oxide (EtO) exposure, gamma irradiation, or steam on the anticoagulant activity and chemical characteristics of immobilized heparin and the permeability of the membrane were investigated.

  5. Subjective sleep efficiency of hemodialysis patients

    NARCIS (Netherlands)

    Koch, B.C.P.; Nagtegaal, J.E.; Hagen, E.C.; van Dorp, W.Th.; Boringa, J.B.S.; Kerkhof, G.A.; ter Wee, P.M.

    2008-01-01

    Background: Sleep disturbances have a major influence on quality of life. A commonly used measure of sleep disturbances is sleep efficiency. The purpose of this study was to investigate the prevalence of decreased subjective sleep efficiency in hemodialysis patients. An additional goal was to

  6. [Home hemodialysis and peritoneal dialysis compared].

    Science.gov (United States)

    Piccoli, Giorgina Barbara; Ferraresi, Martina; Caputo, Flavia; Quarello, Francesco; Viganò, Maria Rosa; Mascia, Franco; Gesualdo, Loreto

    2012-01-01

    The evolution of home dialysis marked the main steps in the progress of renal replacement therapy. From the origins when home hemodialysis was often the only alternative to death, to the advent and widespread use of peritoneal dialysis, the dream of kidney transplant as a solution to all problems (at least in the young), and ultimately the profound social and organizational changes that have led to a drastic reduction of home hemodialysis, we arrive at the present with the rediscovery of the clinical, rehabilitative and economic advantages of home dialysis. Seven experts from five different centers with different expertise in home dialysis report their opinions on the future of home dialysis in a ''noncontroversial controversy''. Beyond the sterile competition between peritoneal dialysis and home hemodialysis, the shared opinion is that the two methods may complement each other, allowing a tailored treatment for each patient and a tailored organization in each setting. The organizational solutions are many; the authors underline the importance of longer survival and better rehabilitation, and the ethical need of offering each patient a choice among all available treatments. Add to this the importance of dedicated educational programs targeted to physicians, nurses and patients alike and focused on self-care and patient empowerment. A new generation of dialysis machines, easier technical solutions, and financial incentives may strengthen motivations and simplify problems; all these elements may in the near future be combined in a joint effort to increase peritoneal dialysis and revive home hemodialysis in Italy.

  7. Erectile Dysfunction in Males on Hemodialysis

    International Nuclear Information System (INIS)

    Haider, E.; Iftikhar, R.; Ghazanfar, A.; Afzal, M.; Mir, A. W.; Mansoor, K.; Taj, R.; Samiullah, R.

    2013-01-01

    Objective: The determine the frequency of erectile dysfunction in males on hemodialysis. Study Design: Descriptive study. Place and duration: Hemodialysis unit, Combined Military Hospital Kharian from October 2011 to April 2012. Patients and Methods: A total of 150 married male patients of end stage renal disease (ESRD) on hemodialysis were included in the study. Patients with cognitive and/or communication deficits and on hemodialysis for less than 06 months were excluded from the study. Erectile dysfunction (ED) was assessed using International Index of Erectile Function-5 (IIEF-5). Frequency of erectile dysfunction (ED) was analyzed using Statistical Package for Social Sciences (SPSS) version 17. Results: Mean age of the patients were 52.89 = 8.25 years. Mean duration of hemodialysis was 34 +- 9.62 months. The underlying etiology of end stage renal disease were diabetic nephropathy 69(46%), hypertensive nephropathy 51(34%), obstructive nephropathy 18(12%), glomerulonephritis 9(6%), autosomal polycystic kidney disease 3(2%). Mean IIEF-5 score was 13.29 +- 6.38. The frequency of erectile dysfunction was 74%. The majority of the patients, 73(48.7%) had moderate erectile dysfunction, while 24 (16%) had severe and 14 (9.3%) had mild erectile dysfunction. Out of total 150 patients enrolled, 39 (26%) patients had no erectile dysfunction. Conclusion: ED is a highly prevalent problem in men with ESRD. Physicians are urged to recognize the high prevalence of erection problems in men with ESRD and proactively question all patients regarding their sexual function. This will not only improve the recognition of this condition among these patients but also improve the quality of life after adequate treatment. (author)

  8. Survival analysis of patients on maintenance hemodialysis

    Directory of Open Access Journals (Sweden)

    A Chandrashekar

    2014-01-01

    Full Text Available Despite the continuous improvement of dialysis technology and pharmacological treatment, mortality rates for dialysis patients are still high. A 2-year prospective study was conducted at a tertiary care hospital to determine the factors influencing survival among patients on maintenance hemodialysis. 96 patients with end-stage renal disease surviving more than 3 months on hemodialysis (8-12 h/week were studied. Follow-up was censored at the time of death or at the end of 2-year study period, whichever occurred first. Of the 96 patients studied (mean age 49.74 ± 14.55 years, 75% male and 44.7% diabetics, 19 died with an estimated mortality rate of 19.8%. On an age-adjusted multivariate analysis, female gender and hypokalemia independently predicted mortality. In Cox analyses, patient survival was associated with delivered dialysis dose (single pool Kt/V, hazard ratio [HR] =0.01, P = 0.016, frequency of hemodialysis (HR = 3.81, P = 0.05 and serum albumin (HR = 0.24, P = 0.005. There was no significant difference between diabetes and non-diabetes in relation to death (Relative Risk = 1.109; 95% CI = 0.49-2.48, P = 0.803. This study revealed that mortality among hemodialysis patients remained high, mostly due to sepsis and ischemic heart disease. Patient survival was better with higher dialysis dose, increased frequency of dialysis and adequate serum albumin level. Efforts at minimizing infectious complications, preventing cardiovascular events and improving nutrition should increase survival among hemodialysis patients.

  9. Thyroid hormone concentrations in dialysate during hemodialysis in children

    International Nuclear Information System (INIS)

    Waters, W.; Bulla, M.; Buschsieweke, U.; Kutzim, H.; Koeln Univ.

    1981-01-01

    Thyroxine (T4) concentration in dialysate in the course of hemodialysis was determined in 15 children. Concentrations were measured by a modified radioimmunoassay. During hemodialysis there was a slight increase in T4 concentration. At the end of hemodialysis T4 concentration was about 50% higher than soon after the onset of hemodialysis. The loss of T4 into dialysate during hemodialysis was 19.2 μg; the loss of T3 was less than 75 ng. The amount of the daily loss of thyroid hormones into dialysate was found to be in the range of normal urinary excretion. The lowering of serum thyroid hormone concentrations in children on hemodialysis cannot be explained by the loss of these hormones into dialysate. (orig.) [de

  10. Drug disposition model of radiolabeled etelcalcetide in patients with chronic kidney disease and secondary hyperparathyroidism on hemodialysis.

    Science.gov (United States)

    Wu, Liviawati; Melhem, Murad; Subramanian, Raju; Wu, Benjamin

    2017-02-01

    Etelcalcetide (AMG 416) is an allosteric activator of the calcium-sensing receptor for treatment of secondary hyperparathyroidism in patients with chronic kidney disease (CKD) on hemodialysis. To characterize the time course of etelcalcetide in different matrices (plasma, dialysate, urine, and feces), a drug disposition model was developed. Nonlinear mixed-effect modeling was used to describe data from six adults with CKD on hemodialysis who received a single intravenous dose of [ 14 C]etelcalcetide (10 mg; 710 nCi) after hemodialysis (study NCT02054572). A three-compartment model with the following attributes adequately described the observed concentration-time profiles of etelcalcetide in the different matrices: biotransformation in the central compartment; elimination in dialysate, urine, and feces; and a nonspecific elimination process. The terminal half-life of total C-14 in plasma was approximately 56 days. The ratio of conjugation-deconjugation rate constants between etelcalcetide and biotransformed products was 11.3. Simulations showed that three hemodialysis sessions per week for 52 weeks would contribute to 60.1% of the total clearance of etelcalcetide following single-dose intravenous etelcalcetide administration. Minimal amounts were eliminated in urine (2.5%) and feces (5.7%), whereas nonspecific elimination accounted for 31.2% of total elimination. In addition to removal of etelcalcetide, ~10% of small-molecular weight biotransformed products was estimated to have been removed through hemodialysis and in urine. This model provided a quantitative approach to describe biotransformation, distribution, and elimination of etelcalcetide, a unique synthetic D-amino acid peptide, in the relevant patient population.

  11. Changes in Plasma Copeptin Levels during Hemodialysis: Are the Physiological Stimuli Active in Hemodialysis Patients?

    Directory of Open Access Journals (Sweden)

    Esmée M Ettema

    Full Text Available Plasma levels of copeptin, a surrogate marker for the vasoconstrictor hormone arginine vasopressin (AVP, are increased in hemodialysis patients. Presently, it is unknown what drives copeptin levels in hemodialysis patients. We investigated whether the established physiological stimuli for copeptin release, i.e. plasma osmolality, blood volume and mean arterial pressure (MAP, are operational in hemodialysis patients.One hundred and eight prevalent, stable hemodialysis patients on a thrice-weekly dialysis schedule were studied during hemodialysis with constant ultrafiltration rate and dialysate conductivity in this observational study. Plasma levels of copeptin, sodium, MAP, and blood volume were measured before, during and after hemodialysis. Multivariate analysis was used to determine the association between copeptin (dependent variable and the physiological stimuli plasma sodium, MAP, excess weight as well as NT-pro-BNP immediately prior to dialysis and between copeptin and changes of plasma sodium, MAP and blood volume with correction for age, sex and diabetes during dialysis treatment.Patients were 63 ± 15.6 years old and 65% were male. Median dialysis vintage was 1.6 years (IQR 0.7-4.0. Twenty-three percent of the patients had diabetes and 82% had hypertension. Median predialysis copeptin levels were 141.5 pmol/L (IQR 91.0-244.8 pmol/L. Neither predialysis plasma sodium levels, nor NT-proBNP levels, nor MAP were associated with predialysis copeptin levels. During hemodialysis, copeptin levels rose significantly (p<0.01 to 163.0 pmol/L (96.0-296.0 pmol/L. Decreases in blood volume and MAP were associated with increases in copeptin levels during dialysis, whereas there was no significant association between the change in plasma sodium levels and the change in copeptin levels.Plasma copeptin levels are elevated predialysis and increase further during hemodialysis. Volume stimuli, i.e. decreases in MAP and blood volume, rather than osmotic

  12. Bone Graft Alternatives

    Science.gov (United States)

    ... spinal deformity, or who have some types of disc herniations. In certain types of spinal fusion, bone grafts ... Specialist SEARCH Download Brochure ENGLISH Related Treatments Cervical Disc Herniation Fusion Lumbar Disc Herniation {1} ##LOC[OK]## {1} ## ...

  13. Melting graft wound syndrome

    Directory of Open Access Journals (Sweden)

    Shiou-Mei Chen

    2017-09-01

    Full Text Available Melting graft wound syndrome is characterized by progressive epidermal loss from a previously well-taken skin graft, healed burn, or donor site. It may result in considerable morbidity and require prolonged treatment. We report a 23-year-old flame-burned patient with second- to third-degree burns involving more than 70% of the total body surface area, whose condition was complicated with septic shock. The patient presented with erosions and ulcers occurring on previously well-taken skin graft recipient sites over both legs and progressive epidermal loss on donor sites over the back. The patient's presentation was compatible with the diagnosis of melting graft wound syndrome, and we successfully treated the patient with debridement and supportive treatment.

  14. 21 CFR 876.5860 - High permeability hemodialysis system.

    Science.gov (United States)

    2010-04-01

    ..., hematocrit, urea, etc.). (3) The high permeability hemodialysis system accessories include, but are not..., hematocrit, and blood recirculation monitors). (b) Classification. Class II. The special controls for this...

  15. Percutaneous Creation of Bare Intervascular Tunnels for Salvage of Thrombosed Hemodialysis Fistulas Without Recanalizable Outflow

    Energy Technology Data Exchange (ETDEWEB)

    Chen, Matt Chiung-Yu, E-mail: jjychen@gmail.com [Yuan’s General Hospital, Department of Interventional Radiology (China); Wang, Yen-Chi [E-Da Hospital, Department of Radiology (China); Weng, Mei-Jui [Kaohsiung Veterans General Hospital, Department of Radiology (China)

    2015-08-15

    PurposeThis study aimed to retrospectively assess the efficacy of a bare intervascular tunnel for salvage of a thrombosed hemodialysis fistula. We examined the clinical outcomes and provided follow-up images of the bare intervascular tunnel.Materials and MethodsEight thrombosed fistulas lacked available recanalizable outflow veins were included in this study. These fistulas were salvaged by re-directing access site flow to a new outflow vein through a percutaneously created intervascular tunnel without stent graft placement. The post-intervention primary and secondary access patency rates were calculated using the Kaplan–Meier method.ResultsThe procedural and clinical success rates were 100 %. Post-intervention primary and secondary access patency at 300 days were 18.7 ± 15.8 and 87.5 ± 11.7 %, respectively. The mean follow-up period was 218.7 days (range 10–368 days). One patient died of acute myocardial infarction 10 days after the procedure. No other major complications were observed. Minor complications, such as swelling, ecchymosis, and pain around the tunnel, occurred in all of the patients.ConclusionsPercutaneous creation of a bare intervascular tunnel is a treatment option for thrombosed hemodialysis fistulas without recanalizable outflow in selected patients.

  16. Preventing infections in patients undergoing hemodialysis.

    Science.gov (United States)

    Kallen, Alexander J; Arduino, Matthew J; Patel, Priti R

    2010-06-01

    Infections continue to be a major cause of morbidity and mortality in patients with end-stage renal disease. While rates of all-cause hospitalization of prevalent end-stage renal disease patients receiving hemodialysis reported by the United States Renal Data System fell from 1993 to 2007, rates of hospitalization for infections rose by 26%. Developing a better understanding of the reasons for this rise and employing strategies to reverse it have become a priority for patients, providers and regulatory agencies in the USA. In addition, recent episodes of transmission of bloodborne hepatitis viruses in outpatient healthcare facilities, including hemodialysis centers, related to suboptimal infection control and injection safety practices, have raised concerns about patient safety. In this article, we review many of the current infection control challenges facing outpatient dialysis centers and discuss recommended infection control policies and practices aimed at combating these challenges.

  17. Severe metabolic alkalosis in a hemodialysis patient.

    Science.gov (United States)

    Huber, Lu; Gennari, F John

    2011-07-01

    We present a patient with end-stage kidney disease receiving hemodialysis therapy who developed severe metabolic alkalosis secondary to vomiting. This case illustrates the important differences in pathogenesis, diagnosis, and management of this common acid-base disorder in patients without kidney function. The diagnostic approach and management strategy for metabolic alkalosis are discussed, highlighting the special issues to be considered in dialysis patients. Copyright © 2011 National Kidney Foundation, Inc. Published by Elsevier Inc. All rights reserved.

  18. Use of dynamometry in hemodialysis patients

    Directory of Open Access Journals (Sweden)

    Ingrid Denise Karpenko Wilman

    2017-05-01

    Full Text Available Introduction: Dynamometry is a cheap, simple and easily reproduced method to assess muscle strength (MS, which, like other processes of obtaining measurements, displays high sensitivity and specificity for the early detection of any change in the nutritional status. Objectives: To evaluate factors concerning the reduction in MS in patients undergoing hemodialysis (HD. Methods: A single center, crosssectional study was carried out. The following clinical variables were analyzed: sex, age, blood pressure, weight, significant weight loss within the last 36 months, body mass index (BMI, weight gain in between dialysis sessions, hemodialysis treatment time, diabetes, energy and protein intake. Other factors taken into account were: laboratory findings (hemoglobin, hepatogram, electrolyte panel, calcium test, phosphate test, lipid profile, protein analysis, transferrin saturation and hand grip strength (before and after dialysis, on both arms measured through dynamometry. The patients' muscle strength values were compared to those of healthy subjects. Values below the 10th percentile were regarded as abnormal. Mean, median, standard deviation as well as the X2 and the Student's t tests were considered where applicable. A p<0.05 constituted a significant value. Results: There were 73 patients included in this study and 47.95% of them showed low MS with significant strength loss on the arm having the vascular access when compared to the other arm (p 0.00019. A longer hemodialysis treatment time (p 0.026 and a lower BMI (p 0.046 were found to be the two variables with the highest impact on MS. Conclusions: Muscle strength loss in patients undergoing hemodialysis is very common and is associated with a longer HD treatment time and a lower BMI.

  19. Intradialytic Exercise Programs for Hemodialysis Patients

    OpenAIRE

    Jung, Tae-Du; Park, Sun-Hee

    2011-01-01

    Although it is widely accepted that exercise is beneficial in patients with end-stage renal disease as in the general population, it is not easy to incorporate exercise programs into routine clinical practice. This review aimed to investigate the beneficial effects of exercise during hemodialysis and also to introduce various intradialytic exercise programs and their advantages as a first step in combining exercise programs into clinical practice. Aerobic and resistance exercise are beneficia...

  20. Increased cerebral water content in hemodialysis patients.

    Directory of Open Access Journals (Sweden)

    Kathrin Reetz

    Full Text Available Little information is available on the impact of hemodialysis on cerebral water homeostasis and its distribution in chronic kidney disease. We used a neuropsychological test battery, structural magnetic resonance imaging (MRI and a novel technique for quantitative measurement of localized water content using 3T MRI to investigate ten hemodialysis patients (HD on a dialysis-free day and after hemodialysis (2.4±2.2 hours, and a matched healthy control group with the same time interval. Neuropsychological testing revealed mainly attentional and executive cognitive dysfunction in HD. Voxel-based-morphometry showed only marginal alterations in the right inferior medial temporal lobe white matter in HD compared to controls. Marked increases in global brain water content were found in the white matter, specifically in parietal areas, in HD patients compared to controls. Although the global water content in the gray matter did not differ between the two groups, regional increases of brain water content in particular in parieto-temporal gray matter areas were observed in HD patients. No relevant brain hydration changes were revealed before and after hemodialysis. Whereas longer duration of dialysis vintage was associated with increased water content in parieto-temporal-occipital regions, lower intradialytic weight changes were negatively correlated with brain water content in these areas in HD patients. Worse cognitive performance on an attention task correlated with increased hydration in frontal white matter. In conclusion, long-term HD is associated with altered brain tissue water homeostasis mainly in parietal white matter regions, whereas the attentional domain in the cognitive dysfunction profile in HD could be linked to increased frontal white matter water content.

  1. Increased cerebral water content in hemodialysis patients.

    Science.gov (United States)

    Reetz, Kathrin; Abbas, Zaheer; Costa, Ana Sofia; Gras, Vincent; Tiffin-Richards, Frances; Mirzazade, Shahram; Holschbach, Bernhard; Frank, Rolf Dario; Vassiliadou, Athina; Krüger, Thilo; Eitner, Frank; Gross, Theresa; Schulz, Jörg Bernhard; Floege, Jürgen; Shah, Nadim Jon

    2015-01-01

    Little information is available on the impact of hemodialysis on cerebral water homeostasis and its distribution in chronic kidney disease. We used a neuropsychological test battery, structural magnetic resonance imaging (MRI) and a novel technique for quantitative measurement of localized water content using 3T MRI to investigate ten hemodialysis patients (HD) on a dialysis-free day and after hemodialysis (2.4±2.2 hours), and a matched healthy control group with the same time interval. Neuropsychological testing revealed mainly attentional and executive cognitive dysfunction in HD. Voxel-based-morphometry showed only marginal alterations in the right inferior medial temporal lobe white matter in HD compared to controls. Marked increases in global brain water content were found in the white matter, specifically in parietal areas, in HD patients compared to controls. Although the global water content in the gray matter did not differ between the two groups, regional increases of brain water content in particular in parieto-temporal gray matter areas were observed in HD patients. No relevant brain hydration changes were revealed before and after hemodialysis. Whereas longer duration of dialysis vintage was associated with increased water content in parieto-temporal-occipital regions, lower intradialytic weight changes were negatively correlated with brain water content in these areas in HD patients. Worse cognitive performance on an attention task correlated with increased hydration in frontal white matter. In conclusion, long-term HD is associated with altered brain tissue water homeostasis mainly in parietal white matter regions, whereas the attentional domain in the cognitive dysfunction profile in HD could be linked to increased frontal white matter water content.

  2. What Is Known and Unknown About Twice-Weekly Hemodialysis.

    Science.gov (United States)

    Obi, Yoshitsugu; Eriguchi, Rieko; Ou, Shuo-Ming; Rhee, Connie M; Kalantar-Zadeh, Kamyar

    2015-01-01

    The 2006 Kidney Disease Outcomes Quality Initiative guidelines suggest twice-weekly or incremental hemodialysis for patients with substantial residual kidney function (RKF). However, in most affluent nations de novo and abrupt transition to thrice-weekly hemodialysis is routinely prescribed for all dialysis-naïve patients regardless of their RKF. We review historical developments in hemodialysis therapy initiation and revisit twice-weekly hemodialysis as an individualized, incremental treatment especially upon first transitioning to hemodialysis therapy. In the 1960's, hemodialysis treatment was first offered as a life-sustaining treatment in the form of long sessions (≥10 hours) administered every 5 to 7 days. Twice- and then thrice-weekly treatment regimens were subsequently developed to prevent uremic symptoms on a long-term basis. The thrice-weekly regimen has since become the 'standard of care' despite a lack of comparative studies. Some clinical studies have shown benefits of high hemodialysis dose by more frequent or longer treatment times mainly among patients with limited or no RKF. Conversely, in selected patients with higher levels of RKF and particularly higher urine volume, incremental or twice-weekly hemodialysis may preserve RKF and vascular access longer without compromising clinical outcomes. Proposed criteria for twice-weekly hemodialysis include urine output >500 ml/day, limited interdialytic weight gain, smaller body size relative to RKF, and favorable nutritional status, quality of life, and comorbidity profile. Incremental hemodialysis including twice-weekly regimens may be safe and cost-effective treatment regimens that provide better quality of life for incident dialysis patients who have substantial RKF. These proposed criteria may guide incremental hemodialysis frequency and warrant future randomized controlled trials. © 2015 S. Karger AG, Basel.

  3. Convenient synthetic method of starch/lactic acid graft copolymer ...

    Indian Academy of Sciences (India)

    is a potentially useful and completely biodegradable material for biodegradable plastics because of its nontoxic, low cost and its natural abundance which can be obtained from many crops including corn, wheat, rice, potato and so on (Tester and Karkallas 2002). Therefore, modification of starch, physi- cally and chemically ...

  4. Convenient synthetic method of starch/lactic acid graft copolymer ...

    Indian Academy of Sciences (India)

    Cho and Lee 2002; Zhai et al 2002; Fanta et al 2004) can improve the ... aliphatic polyester (Sang et al 1997; Choi et al 1999; Dubois et al 1999) are a .... Chemical shift /ppm. 5.50. 5.40 4.59. 3.60~3.40. (A). DMSO. Figure 4. 1H-NMR spectra of cornstarch (A) and starch/LA copolymer (B). HO. OH. CH3. O. O. H. O. HO. H. OH.

  5. Axillobifemoral bypass grafting

    Directory of Open Access Journals (Sweden)

    Davidović Lazar B.

    2004-01-01

    Full Text Available INTRODUCTION Axillo-femoral bypass (AxF means connecting the axillar and femoral artery with the graft that is placed subcutaneously [1]. Usually, this graft is connected with contralateral femoral artery via one accessory subcutaneous graft, and this connection is known as axillobifemoral bypass (AxFF. This extra-anatomic procedure is an alternative method to the standard reconstruction of aortoiliac region when there are contraindications for general or local reasons. OBJECTIVE The objective of this paper is to show early and late results of AxFF bypass grafting as well as to show the indications for AxFF bypass. METHODS The sample consisted of 37 patients. The procedure was performed in 28 patients who suffered from aortoiliac occlusive disease and who were at high risk due to the comorbidity- in one patient with the rupture of juxtarenal aneurysm of abdominal aorta; in five patients with aortoenteric fistula, in two patients with iatrogenic lesion of abdominal aorta and in one female patient with anus preternaturalis definitivus who was treated for rectovaginal fistula. Donor's right axillary artery was used in 26 cases (70.3%, and donor's left axillary artery was used in 9 cases (29.7%. Dacron graft was used in 34 patients and Polytetrafluo-roethlylene graft was used in three patients. Simultaneously, profundo-plastic was done in four patients and femoro-popliteal bypass was performed in three patients. In five patients who suffered from aortoenteric fistula, simultaneous intervention of gastrointerstinal system has been done, x2 test was used for statistical evaluation and life table method was used for verification of late graft patency. RESULTS The rate of early postoperative mortality was 13.5%. The causes of death were: sepsis -1, MOFS - 3, and infarct myocardium -1. The mean follow up period was 40.1 months, ranging from six months to 17 years. During the follow up period, an early graft thrombosis was identified in two and late graft

  6. Comparison of Hemoglobin Levels Before and After Hemodialysis and Their Effects on Erythropoietin Dosing and Cost

    OpenAIRE

    Sagheb; Fallahzadeh; Moaref; Fallahzadeh; Dormanesh

    2016-01-01

    Background Hemoglobin levels measured after hemodialysis, as compared to hemoglobin levels measured before hemodialysis, are suggested to be a more accurate reflection of the hemoglobin levels between hemodialysis sessions, and to be a better reference point for adjusting erythropoietin dosing. Objectives The aim of this study was to compare the hemoglobin levels before and after hemodialysis, to calculate the required erythropoie...

  7. Vitamin D deficiency in hemodialysis patients

    Directory of Open Access Journals (Sweden)

    Beena Bansal

    2012-01-01

    Full Text Available Background : Vitamin D [(25(OHD] deficiency and insufficiency is common in patients with chronic kidney disease (CKD. 25(OHD has been found to have beneficial effects on bone, cardiovascular and immune functions. There are little data about vitamin D levels in Indian patients on dialysis. This study was undertaken to determine the vitamin D status of Indian CKD patients on hemodialysis. Materials and Methods : We included 45 patients on maintenance hemodialysis coming to Medanta, Medicity, Gurgaon. 25(OHD levels were measured with radioimmunoassay (Diasorin method and parathyroid hormone (PTH was measured using electrochemiluminiscence immunoassay (ECLIA. Results : The mean age of patients was 55 ± 13 years. 32/45 (71% were males. 23/45 (51% were diabetics. The median duration of hemodialysis was 5.5 months (range 1-74 months. 33/45 (74% patients were on thrice weekly hemodialysis. The mean level of vitamin D was 10.14 ± 8.7 ng/ml. Majority of the patients [43/45 (95.5%] were either vitamin D deficient or had insufficient levels. 40/45 (88.9% were vitamin D deficient (levels <20 ng/ml; of these, 29/40 (64.4% had severe vitamin D deficiency (levels <10 ng/ml and 3/45 (6.7% had insufficient levels (20-30 ng/ml of vitamin D. Only 2/45 (4.4% patients had normal levels of vitamin D. 23/45 (51% of patients were receiving calcitriol. The mean levels of serum calcium, phosphorus, alkaline phosphatase, and albumin were 8.8 ± 0.64 mg/dl, 5.0 ± 0.7 mg/dl, 126 ± 10.3 IU/l and 3.6 ± 0.62 g/dl, respectively. PTH levels ranged from 37 to 1066 pg/ml, and the median was 195.8 pg/ml. There was a weak correlation between 25(OHD levels and weight, sex, hemoglobin, albumin, alkaline phosphatase, and presence of diabetes. There was, however, no correlation with duration of dialysis or PTH levels. Conclusion : Vitamin D deficiency and insufficiency are universal in our hemodialysis patients, with severe vitamin D deficiency in two-third of patients.

  8. Non invasive assessment of liver fibrosis in chronic hemodialysis ...

    African Journals Online (AJOL)

    The liver biopsy has long been the "gold standard" for assessing liver fibrosis in patients with hepatitis C. It's an invasive procedure which is associated with an elevated bleeding, especially in chronic hemodialysis patients. Main goal is to assess liver fibrosis in chronic hemodialysis with HCV by Fibroscan and by biological ...

  9. Occluded hemodialysis shunts: Dutch multicenter experience with the hydrolyser catheter

    NARCIS (Netherlands)

    Overbosch, E. H.; Pattynama, P. M.; Aarts, H. J.; Schultze Kool, L. J.; Hermans, J.; Reekers, J. A.

    1996-01-01

    PURPOSE: To evaluate mechanical thrombectomy of occluded hemodialysis access shunts with a recently developed hydrodynamic device. MATERIALS AND METHODS: Sixty-five thrombosed hemodialysis access shunts were treated in 49 patients. The shunts were of three types: Brescia-Cimino fistulas (24

  10. Hemodialysis, plea of availability versus adequecy gezira experience

    African Journals Online (AJOL)

    ... two to three times per week and \\or increase the duration of hemodialysis session, increase blood flow rate and dialysate flow rate. Moreover, decrease the number of patients on regular hemodialysis by encouraging the patients to take the other renal replacement therapy (peritoneal dialysis and renal transplantations).

  11. Complications of grafts used in female pelvic floor reconstruction: Mesh erosion and extrusion

    Directory of Open Access Journals (Sweden)

    Tanya M Nazemi

    2007-01-01

    Full Text Available Introduction: Various grafts have been used in the treatment of urinary incontinence and pelvic prolapse. Autologous materials such as muscle and fascia were first utilized to provide additional anatomic support to the periurethral and pelvic tissues; however, attempts to minimize the invasiveness of the procedures have led to the use of synthetic materials. Complications such as infection and erosion or extrusion associated with these materials may be troublesome to manage. We review the literature and describe a brief overview of grafts used in pelvic floor reconstruction and focus on the management complications specifically related to synthetic materials. Materials and Methods: We performed a comprehensive review of the literature on grafts used in pelvic floor surgery using MEDLINE and resources cited in those peer-reviewed manuscripts. The results are presented. Results: Biologic materials provide adequate cure rates but have associated downfalls including potential complications from harvesting, variable tissue quality and cost. The use of synthetic materials as an alternative graft in pelvic floor repairs has become a popular option. Of all synthetic materials, the type I macroporous polypropylene meshes have demonstrated superiority in terms of efficacy and fewer complication rates due to their structure and composition. Erosion and extrusion of mesh are common and troublesome complications that may be managed conservatively with observation with or without local hormone therapy, with transvaginal debridement or with surgical exploration and total mesh excision, dependent upon the location of the mesh and the mesh type utilized. Conclusions: The ideal graft would provide structural integrity and durability with minimal adverse reaction by the host tissue. Biologic materials in general tend to have fewer associated complications, however, the risks of harvesting, variable integrity of allografts, availability and high cost has led to the

  12. Composite vascular grafts with high cell infiltration by co-electrospinning

    Energy Technology Data Exchange (ETDEWEB)

    Tan, Zhikai, E-mail: tanzk@hnu.edu.cn; Wang, Hongjie; Gao, Xiangkai; Liu, Tong; Tan, Yongjun

    2016-10-01

    There is an increasing demand for functional small-diameter vascular grafts (diameter < 6 mm) to be used in clinical arterial replacement. An ideal vascular graft should have appropriate biomechanical properties and be biocompatible. Electrospinning has become a popular polymer processing technique for vascular tissue engineering, but the grafts fabricated by electrospinning often have relatively small pores and low porosity, which limit cell infiltration into scaffolds and hinder the regeneration and remodeling of grafts. In the present study, we aimed to develop an efficient method to prepare electrospun composite vascular grafts comprising natural and synthetic materials. We fabricated grafts made of polycaprolactone, gelatin, and polyvinyl alcohol (PVA) by co-electrospinning, and the scaffolds were further functionalized by immobilizing heparin on them. The PVA fibers degraded rapidly in vivo and generated electrospun scaffolds with high porosity, which significantly enhanced cell proliferation and infiltration. The mechanical properties of the grafts are suitable for use in artery replacement. Heparin functionalization of the grafts yielded a good antithrombogenic effect, which was demonstrated in platelet adhesion tests. Moreover, in vitro and in vivo results demonstrated that the heparin release from the grafts enhanced the growth of endothelial cells, which is important for the endothelium of implanted grafts. The results of this study indicate that our method is effective and controllable for the fabrication of vascular grafts that meet the clinical requirements for blood vessel transplantation. - Highlights: • This study indicate an effective method for the fabrication of vascular grafts that meet the clinical requirements. • Co-electrospinning were used to fabricate grafts made of polycaprolactone (PCL), gelatin (GT), and polyvinyl alcohol (PVA). • PVA was used to create large pores within the hybrid scaffolds, thereby enhancing cell infiltration

  13. Intraarterial 9-beta-methyl carbacyclin improves canine polytetrafluoroethylene graft patency

    International Nuclear Information System (INIS)

    Dacey, L.J.; Hees, P.S.; Cronenwett, J.L.

    1988-01-01

    This study examined the effect of 9-beta-methyl carbacyclin, a synthetic, stable prostacyclin analog, on canine polytetrafluoroethylene (PTFE) graft patency. Twenty-five dogs had 4 mm x 7 cm PTFE grafts implanted bilaterally into the femoral arteries. A subcutaneous infusion pump was used to deliver either saline solution (control) or 9-beta-methyl carbacyclin (Ciprostine) at 100 (CARB-100) or 200 ng/kg/min (CARB-200) through a femoral artery branch just proximal to one of the femoral grafts, with the contralateral graft serving as a noninfused control. Graft-platelet deposition (with 111 In-labeled platelets) was measured between the fifth and seventh days, with patency determined on the seventh day. Dogs were classified as aggregators (AGG [+]) if the preoperative epinephrine-enhanced sodium arachidonate platelet aggregation was greater than 20%. CARB-200 infusion significantly improved ipsilateral graft patency (80%) compared with noninfused grafts (50%, p less than 0.05), or grafts in control and CARB-100 dogs (43%, p less than 0.05). Anastomotic platelet deposition was decreased bilaterally in CARB-200 dogs by 45% to 59% compared with CARB-100 and control dogs (p less than 0.05). With the exception of grafts infused with CARB-200, AGG (+) dogs had significantly lower graft patency (26%) than nonaggregator AGG (-) dogs (71%, p less than 0.01). CARB-200 infusion significantly improved graft patency in AGG (+) dogs (71%), compared with control and CARB-100-infused grafts (19%, p less than 0.025). Intra-arterial 9-beta-methyl carbacyclin improved early PTFE graft patency and inhibited platelet deposition in a severe canine model, independent of baseline platelet aggregation status, which also had an important effect on graft patency

  14. Graft polymerization of vinyl acetate onto starch. Saponification to starch-g-poly(vinyl alcohol)

    International Nuclear Information System (INIS)

    Fanta, G.F.; Burr, R.C.; Doane, W.M.; Russell, C.R.

    1979-01-01

    Graft polymerizations of vinyl acetate onto granular cornstarch were initiated by cobalt-60 irradiation of starch-monomer-water mixtures, and ungrafted poly(vinyl acetate) was separated from the graft copolymer by benzene extraction. Conversions of monomer to polymer were quantitative at a radiation dose of 1.0 Mrad. Over half of the polymer was present as ungrafted poly(vinyl acetate) (grafting efficiency less than 50%), and the graft copolymer contained only 34% grafted synthetic polymer (34% add-on). Lower irradiation doses produced lower conversions of monomer to polymer and gave graft copolymers with lower % add-on. Addition of minor amounts of acrylamide, methyl acrylate, and methacrylic acid as comonomers produced only small increases in % add-on and grafting efficency. Grafting efficiency was increased to 70% when a monomer mixture containing about 10% methyl methacrylate was used. Grafting efficiency could be increased to over 90% if the graft polymerization of vinyl acetate--methyl methacrylate was carried out near 0 0 C; although conversion of monomers to polymer was low and grafted polymer contained 40 to 50% poly(methyl methacrylate). Selected graft copolymers were treated with methanolic sodium hydroxide to convert starch-g-poly(vinyl acetate) to starch-g-poly(vinyl alcohol). The molecular weight of the poly(vinyl alcohol) moiety was about 30,000. The solubility of starch-g-poly(vinyl alcohol) in hot water was less than 50; however, solubility could be increased by substituting either acid-modified or hypochlorite-oxidized for unmodified starch in the graft polymerization reaction. Vinyl acetate was also graft polymerized onto acid-modified starch which had been dispersed and partially solubilized by heating in water. A total irradiation dose of either 1.0 or 0.5 Mrad gave starch-g-poly

  15. Composite vascular grafts with high cell infiltration by co-electrospinning

    International Nuclear Information System (INIS)

    Tan, Zhikai; Wang, Hongjie; Gao, Xiangkai; Liu, Tong; Tan, Yongjun

    2016-01-01

    There is an increasing demand for functional small-diameter vascular grafts (diameter < 6 mm) to be used in clinical arterial replacement. An ideal vascular graft should have appropriate biomechanical properties and be biocompatible. Electrospinning has become a popular polymer processing technique for vascular tissue engineering, but the grafts fabricated by electrospinning often have relatively small pores and low porosity, which limit cell infiltration into scaffolds and hinder the regeneration and remodeling of grafts. In the present study, we aimed to develop an efficient method to prepare electrospun composite vascular grafts comprising natural and synthetic materials. We fabricated grafts made of polycaprolactone, gelatin, and polyvinyl alcohol (PVA) by co-electrospinning, and the scaffolds were further functionalized by immobilizing heparin on them. The PVA fibers degraded rapidly in vivo and generated electrospun scaffolds with high porosity, which significantly enhanced cell proliferation and infiltration. The mechanical properties of the grafts are suitable for use in artery replacement. Heparin functionalization of the grafts yielded a good antithrombogenic effect, which was demonstrated in platelet adhesion tests. Moreover, in vitro and in vivo results demonstrated that the heparin release from the grafts enhanced the growth of endothelial cells, which is important for the endothelium of implanted grafts. The results of this study indicate that our method is effective and controllable for the fabrication of vascular grafts that meet the clinical requirements for blood vessel transplantation. - Highlights: • This study indicate an effective method for the fabrication of vascular grafts that meet the clinical requirements. • Co-electrospinning were used to fabricate grafts made of polycaprolactone (PCL), gelatin (GT), and polyvinyl alcohol (PVA). • PVA was used to create large pores within the hybrid scaffolds, thereby enhancing cell infiltration

  16. Composite vascular grafts with high cell infiltration by co-electrospinning.

    Science.gov (United States)

    Tan, Zhikai; Wang, Hongjie; Gao, Xiangkai; Liu, Tong; Tan, Yongjun

    2016-10-01

    There is an increasing demand for functional small-diameter vascular grafts (diameterElectrospinning has become a popular polymer processing technique for vascular tissue engineering, but the grafts fabricated by electrospinning often have relatively small pores and low porosity, which limit cell infiltration into scaffolds and hinder the regeneration and remodeling of grafts. In the present study, we aimed to develop an efficient method to prepare electrospun composite vascular grafts comprising natural and synthetic materials. We fabricated grafts made of polycaprolactone, gelatin, and polyvinyl alcohol (PVA) by co-electrospinning, and the scaffolds were further functionalized by immobilizing heparin on them. The PVA fibers degraded rapidly in vivo and generated electrospun scaffolds with high porosity, which significantly enhanced cell proliferation and infiltration. The mechanical properties of the grafts are suitable for use in artery replacement. Heparin functionalization of the grafts yielded a good antithrombogenic effect, which was demonstrated in platelet adhesion tests. Moreover, in vitro and in vivo results demonstrated that the heparin release from the grafts enhanced the growth of endothelial cells, which is important for the endothelium of implanted grafts. The results of this study indicate that our method is effective and controllable for the fabrication of vascular grafts that meet the clinical requirements for blood vessel transplantation. Copyright © 2016 Elsevier B.V. All rights reserved.

  17. Grafts for Ridge Preservation

    Science.gov (United States)

    Jamjoom, Amal; Cohen, Robert E.

    2015-01-01

    Alveolar ridge bone resorption is a biologic phenomenon that occurs following tooth extraction and cannot be prevented. This paper reviews the vertical and horizontal ridge dimensional changes that are associated with tooth extraction. It also provides an overview of the advantages of ridge preservation as well as grafting materials. A Medline search among English language papers was performed in March 2015 using alveolar ridge preservation, ridge augmentation, and various graft types as search terms. Additional papers were considered following the preliminary review of the initial search that were relevant to alveolar ridge preservation. The literature suggests that ridge preservation methods and augmentation techniques are available to minimize and restore available bone. Numerous grafting materials, such as autografts, allografts, xenografts, and alloplasts, currently are used for ridge preservation. Other materials, such as growth factors, also can be used to enhance biologic outcome. PMID:26262646

  18. [Chickenpox, burns and grafts].

    Science.gov (United States)

    Rojas Zegers, J; Fidel Avendaño, L

    1979-01-01

    An outbreak of chickenpox that occurred at the Burns Repair Surgery Unit, Department of Children's Surgery, Hospital R. del Río, between June and November, 1975, is reported. 27 cases of burned children were studied, including analysis of correlations of the stages and outcome of the disease (varicela), the trauma (burns) and the graft (repair surgery). As a result, the authors emphasize the following findings: 1. Burns and their repair are not aggravating factors for varicella. In a small number of cases the exanthema looked more confluent in the graft surgical areas and in the first degree burns healing spontaneously. 2. Usually there was an uneventful outcome of graft repair surgery on a varicella patient, either during the incubation period, the acme or the convalescence. 3. The fact that the outmost intensity of secondary viremia of varicella occurs before the onset of exanthemia, that is, during the late incubation period, is confirmed.

  19. Arteriovenous shunt graft ulceration with sinus and graft epithelialization

    Directory of Open Access Journals (Sweden)

    Pooja Singhal

    2015-03-01

    Full Text Available Arteriovenous fistula and grafts are used as access sites for patients with chronic kidney disease and are prone for complications. Stent grafts are used to treat access site complications. We report a rare and unusual finding of epithelialization of the sinus tract and the lumen of a polytetrafluoroethylene graft, following ulceration of the overlying skin.

  20. Designing a model to minimize inequities in hemodialysis facilities distribution

    Directory of Open Access Journals (Sweden)

    Teresa M. Salgado

    2011-11-01

    Full Text Available Portugal has an uneven, city-centered bias in the distribution of hemodialysis centers found to contribute to health care inequities. A model has been developed with the aim of minimizing access inequity through the identification of the best possible localization of new hemodialysis facilities. The model was designed under the assumption that individuals from different geographic areas, ceteris paribus, present the same likelihood of requiring hemodialysis in the future. Distances to reach the closest hemodialysis facility were calculated for every municipality lacking one. Regions were scored by aggregating weights of the “individual burden”, defined as the burden for an individual living in a region lacking a hemodialysis center to reach one as often as needed, and the “population burden”, defined as the burden for the total population living in such a region. The model revealed that the average travelling distance for inhabitants in municipalities without a hemodialysis center is 32 km and that 145,551 inhabitants (1.5% live more than 60 min away from a hemodialysis center, while 1,393,770 (13.8% live 30-60 min away. Multivariate analysis showed that the current localization of hemodialysis facilities is associated with major urban areas. The model developed recommends 12 locations for establishing hemodialysis centers that would result in drastically reduced travel for 34 other municipalities, leaving only six (34,800 people with over 60 min of travel. The application of this model should facilitate the planning of future hemodialysis services as it takes into consideration the potential impact of travel time for individuals in need of dialysis, as well as the logistic arrangements required to transport all patients with end-stage renal disease. The model is applicable in any country and health care planners can opt to weigh these two elements differently in the model according to their priorities.

  1. Graft nephrectomy: The SGPGI experience

    OpenAIRE

    Nand Kishore Arvind; Aneesh Srivastava; Anant Kumar; Subodh K Das

    2002-01-01

    Background: Graft nephrectomy is often considered a hazardous procedure with high morbidity and occasional mortality, and this may pose a technical challenge. The aim of this study was to evaluate the indications, etiology and complications following graft nephrectomy. Materials and Methods: From 1988 to 2001, among total of 1,019 live related renal transplants carried at our center, 46 underwent graft nephrectomy. Patients were divided into 2 groups depending on timing of graft re-mova...

  2. Endovascular management of renal transplant dysfunction secondary to hemodynamic effects related to ipsilateral femoral arteriovenous graft

    Science.gov (United States)

    Salsamendi, Jason; Pereira, Keith; Quintana, David; Bleicher, Drew; Tabbara, Marwan; Goldstein, Michael; Narayanan, Govindarajan

    2016-01-01

    Hemodialysis access options become complex in long-term treatment for patients with renal disease, while awaiting renal transplantation (RT). Once upper extremity sites are exhausted, lower extremities are used. RT is preferably in the contralateral iliac fossa, rarely ipsilateral. In current literature, RT dysfunction secondary to the hemodynamic effects of an ipsilateral femoral arteriovenous graft (AVG) has been rarely described. To our knowledge, AVG ligation is the only published technique for hemodynamic correction of an ipsilateral AVG. We present a simple, potentially reversible endovascular approach to manage the hemodynamic effects of an AVG, without potentially permanently losing future AVG access. PMID:26899147

  3. Haemodynamics in axillobifemoral bypass grafts

    NARCIS (Netherlands)

    C.H. Wittens

    1992-01-01

    textabstractThis thesis is based on four publications on the subject of graft configuration and haemodynamics in axillobifemoral bypass grafts: 1. A clinical evaluation of 17 patients with axillobifemoral bypass graft operations, performed for various indications. Two important observations were

  4. Acrylonitrile grafted to PVDF

    Energy Technology Data Exchange (ETDEWEB)

    Yang, Jin; Eitouni, Hany Basam

    2015-03-31

    PVDF-g-PAN has been synthesized by grafting polyacrylonitrile onto polyvinylidene fluoride using an ATRP/AGET method. The novel polymer is ionically conducive and has much more flexibility than PVDF alone, making it especially useful either as a binder in battery cell electrodes or as a polymer electrolyte in a battery cell.

  5. Aortic Graft Infection Secondary to Iatrogenic Transcolonic Graft Malposition.

    Science.gov (United States)

    Blank, Jacqueline J; Rothstein, Abby E; Lee, Cheong Jun; Malinowski, Michael J; Lewis, Brian D; Ridolfi, Timothy J; Otterson, Mary F

    2018-01-01

    Aortic graft infections are a rare but devastating complication of aortic revascularization. Often infections occur due to contamination at the time of surgery. Iatrogenic misplacement of the limbs of an aortobifemoral graft is exceedingly rare, and principles of evaluation and treatment are not well defined. We report 2 cases of aortobifemoral bypass graft malposition through the colon. Case 1 is a 54-year-old male who underwent aortobifemoral bypass grafting for acute limb ischemia. He had previously undergone a partial sigmoid colectomy for diverticulitis. Approximately 6 months after vascular surgery, he presented with an occult graft infection. Preoperative imaging and intraoperative findings were consistent with graft placement through the sigmoid colon. Case 2 is a 60-year-old male who underwent aortobifemoral bypass grafting due to a nonhealing wound after toe amputation. His postoperative course was complicated by pneumonia, bacteremia thought to be secondary to the pneumonia, general malaise, and persistent fevers. Approximately 10 weeks after the vascular surgery, he presented with imaging and intraoperative findings of graft malposition through the cecum. Aortic graft infection is usually caused by surgical contamination and presents as an indolent infection. Case 1 presented as such; Case 2 presented more acutely. Both grafts were iatrogenically misplaced through the colon at the index operation. The patients underwent extra-anatomic bypass and graft explantation and subsequently recovered.

  6. Functional Status of Patients on Maintenance Hemodialysis

    Directory of Open Access Journals (Sweden)

    Akash Nabil

    1999-01-01

    Full Text Available Factors associated with physical well being were examined in adults with end-stage renal disease (ESRD in two large hemodialysis units of the Royal Medical Services in Jordan. Utilizing the Karnofski scale we measured the functional status of 200 Patients who had been on maintenance hemodialysis for at least 12 months. A Marnofski scale of less than 70 incidents frank disability (Inability to perform routine living activities without assistance, in addition current vocational status was assessed as well as any existing comorbid conditions. The mean age of the study group was 45.2 years (range 16 to 70 and included 108 (54% males and 92 (46% females, there were 39 (19.5% diabetic patients and 27 (13.5% patients were receiving erythropoietin (EPO. The mean hematocrit of the entire group was 27.8%. As measured by Karnofski scale, 64 (32% of the patients were unable to perform routine living activity without assistance; dependence on wheelchair was reported by 9 (4.5% patients. The mean comorbidity index of patients who scored less than 70 on the Karnofski scale was 1.5 compared to 0.7 for those who scored at least 70 on the same scale (p< 0.001. Analysis of factors showed that age and diabetes mellitus affected functional status. Of the laboratory variables measured, only serum albumin concentration correlated significant with Karnofski scale. Fourteen (21.8% of the patients who scored below 70, had serum albumin concentration above 40g/L compared to 66 (48.5% of the patients who scored at least 70 on the Karnofski scale (p< 0.001. We conclude that a significant proportion of patients on maintenance hemodialysis is functionally disabled. The elderly, diabetics, patients with high co-morbidity index and those with low serum albumin are most likely to have poor functional status.

  7. Biofeedback systems and adaptive control hemodialysis treatment

    Directory of Open Access Journals (Sweden)

    Azar Ahmad

    2008-01-01

    Full Text Available On-line monitoring devices to control functions such as volume, body temperature, and ultrafiltration, were considered more toys than real tools for routine clinical application. However, bio-feedback blood volume controlled hemodialysis (HD is now possible in routine dialysis, allowing the delivery of a more physiologically acceptable treatment. This system has proved to reduce the incidence of intra-HD hypotension episodes significantly. Ionic dialysance and the patient′s plasma conductivity can be calculated easily from on-line measurements at two different steps of dialysate conductivity. A bio-feedback system has been devised to calculate the patient′s plasma conductivity and modulate the conductivity of the dialysate continuously in order to achieve a desired end-dialysis patient plasma conductivity corresponding to a desired end-dialysis plasma sodium concentration. Another bio-feedback system can control the body tempe-rature by measuring it at the arterial and venous lines of the extra-corporeal circuit, and then modulating the dialysate temperature in order to stabilize the patients′ temperature at constant values that result in improved intra-HD cardiovascular stability. The module can also be used to quantify vascular access recirculation. Finally, the simultaneous computer control of ultrafiltration has proven the most effective means for automatic blood pressure stabilization during hemo-dialysis treatment. The application of fuzzy logic in the blood-pressure-guided biofeedback con-trol of ultrafiltration during hemodialysis is able to minimize HD-induced hypotension. In con-clusion, online monitoring and adaptive control of the patient during the dialysis session using the bio-feedback systems is expected to render the process of renal replacement therapy more physiological and less eventful.

  8. Supporting hemodialysis patients: A phenomenological study.

    Science.gov (United States)

    Shahgholian, Nahid; Yousefi, Hojatollah

    2015-01-01

    Chronic renal disease and hemodialysis cause numerous psychological, social, cultural, and spiritual challenges for both patients and their families. Overcoming these challenges is possible only through providing holistic support for the patients. Today, despite the support provided by family and professional caregivers for the patients, patients still express dissatisfaction with the support provided and believe it to be inadequate. In fact, patients and family caregivers and healthcare practitioners seem to have different understandings of the notion of support. Thus, the researcher decided to examine the concept of support from the viewpoint of hemodialysis patients. This descriptive phenomenological research was conducted on 17 patients with end-stage renal disease (ESRD) who were undergoing hemodialysis. Purposive sampling was performed and continued until data saturation. Data were collected through 30-60 min unstructured interviews and analyzed using Colaizzi's method. From the analysis of data, 4 themes (psychological support, accompaniment, social support, and spiritual support) and 11 sub-themes were obtained. Psychological support consisted of two sub-themes of psychological support by healthcare practitioners and emotional support by family and relatives. Accompaniment included three sub-themes of assistance in transportation, providing and using medicine, and daily activities. Social support was identified with four sub-themes of promotion of the society's understanding of the patients' condition, improvement of communication with others, the need for employment, and independence. Spiritual support was identified with two sub-themes of the need for faith and trust in God or Imams and the need to resolve spiritual contradictions. The results showed that from the viewpoint of the participants, the concept of support consisted of psychological support, social support, accompanying the patient, and spiritual support. Hence, it can be concluded that this

  9. VUV modification promotes endothelial cell proliferation on PTFE vascular grafts

    Science.gov (United States)

    Cezeaux, J. L.; Romoser, C. E.; Benson, R. S.; Buck, C. K.; Sackman, J. E.

    1998-05-01

    Small diameter (⩽6 mm ID ) synthetic vascular grafts, used as lower-limb vessel replacements in patients without suitable autologous saphenous veins, have a failure rate of 53% after 4 yr. Graft failure is due to thrombosis and intimal hyperplasia, an increase in smooth muscle cells in the lumen of the vessel which leads to progressive closing and ultimate occlusion of the vessel. In an effort to increase patency rates of synthetic grafts, investigators have seeded vascular grafts with endothelial cells prior to implantation in an attempt to control both thrombosis and smooth muscle proliferation. This technique has been successful for the development of an endothelial monolayer in animal trials, but has met with limited success in humans. The hydrophobicity, low surface energy, and weak electrical charge of expanded polytetrafluoroethylene (ePTFE) provides conditions which are not optimal for endothelial cell attachment. The purpose of this study is to evaluate the effect of vacuum ultraviolet (VUV) modification of ePTFE on endothelial cell adhesion and proliferation. Pieces of ePTFE graft material were exposed to 10, 20 or 40 W VUV radiation for 10, 20 or 40 min using a UV excimer lamp. Prior to cell adhesion and proliferation experiments, the grafts pieces were autoclaved and cut into pledgets. Half of the pledgets were precoated with fibronectin ( 20 μg/ml). Cell adhesion was measured by seeding 3H-thymidine labeled human umbilical vein endothelial cells (HUVEC) onto the pledgets for 60 min. The pledgets were then washed and the remaining radioactivity assayed using scintillation counting. For the cell proliferation experiments, pledgets were seeded with unlabeled HUVEC which were allowed to adhere to the graft material for 18 h. The cells were then exposed to 3H-thymidine ( 1 μCi/ml) for approximately 48 h and then washed to remove any unincorporated 3H-thymidine. Incorporation of 3H-thymidine was measured using scintillation counting. Four replicate

  10. Assessment of Bonelike (registered) graft with a resorbable matrix using an animal model

    International Nuclear Information System (INIS)

    Lobato, J.V.; Hussain, N. Sooraj; Botelho, C.M.; Mauricio, A.C.; Afonso, A.; Ali, N.; Santos, J.D.

    2006-01-01

    Synthetic bone grafts have been developed to provide an alternative to autografts and allografts. Bonelike (registered) is a patented synthetic osteoconductive bone graft that mimics the mineral composition of natural bone. In the present preliminary animal studies a user-friendly version of synthetic bone graft Bonelike (registered) have been developed by using a resorbable matrix, Floseal (registered) , as a vehicle and raloxifene hydrochloride as a therapeutic molecule, that is known to decrease osteoclast activity and therefore enhanced bone formation. From histological and scanning electron microscopy evaluations, the use of Bonelike (registered) associated with Floseal (registered) and raloxifene hydrochloride showed that new bone was rapidly apposed on implanted granules and also that the presence of the matrix and therapeutic molecule does not alter the proven highly osteoconductivity properties of Bonelike (registered) . Therefore, this association may be one step-forward for the clinical applications of Bonelike (registered) scaffolds since it is much more easy-to-handle when compared to granular materials

  11. Polysulfone Functionalized With Phosphonated Poly(pentafluorostyrene) Grafts for Potential Fuel Cell Applications

    DEFF Research Database (Denmark)

    Dimitrov, Ivaylo; Takamuku, Shogo; Jankova Atanasova, Katja

    2012-01-01

    A multi‐step synthetic strategy to polysulfone (PSU) grafted with phosphonated poly(pentafluorostyrene) (PFS) is developed. It involves controlled radical polymerization resulting in alkyne‐end functional PFS. The next step is the modification of PSU with a number of azide side groups. The grafti....... The proposed synthetic route opens the possibility to tune copolymers’ hydrophilic–hydrophobic balance to obtain membranes with an optimal balance between proton conductivity and mechanical properties.......A multi‐step synthetic strategy to polysulfone (PSU) grafted with phosphonated poly(pentafluorostyrene) (PFS) is developed. It involves controlled radical polymerization resulting in alkyne‐end functional PFS. The next step is the modification of PSU with a number of azide side groups. The grafting...

  12. Plant synthetic biology.

    Science.gov (United States)

    Liu, Wusheng; Stewart, C Neal

    2015-05-01

    Plant synthetic biology is an emerging field that combines engineering principles with plant biology toward the design and production of new devices. This emerging field should play an important role in future agriculture for traditional crop improvement, but also in enabling novel bioproduction in plants. In this review we discuss the design cycles of synthetic biology as well as key engineering principles, genetic parts, and computational tools that can be utilized in plant synthetic biology. Some pioneering examples are offered as a demonstration of how synthetic biology can be used to modify plants for specific purposes. These include synthetic sensors, synthetic metabolic pathways, and synthetic genomes. We also speculate about the future of synthetic biology of plants. Copyright © 2015 Elsevier Ltd. All rights reserved.

  13. The home hemodialysis hub: physical infrastructure and integrated governance structure.

    Science.gov (United States)

    Marshall, Mark R; Young, Bessie A; Fox, Sally J; Cleland, Calli J; Walker, Robert J; Masakane, Ikuto; Herold, Aaron M

    2015-04-01

    An effective home hemodialysis program critically depends on adequate hub facilities and support functions and on transparent and accountable organizational processes. The likelihood of optimal service delivery and patient care will be enhanced by fit-for-purpose facilities and implementation of a well-considered governance structure. In this article, we describe the required accommodation and infrastructure for a home hemodialysis program and a generic organizational structure that will support both patient-facing clinical activities and business processes. © 2015 International Society for Hemodialysis.

  14. Research work of radiation induced graft polymerization for synthesis and modification of polymer materials in CRICI

    Energy Technology Data Exchange (ETDEWEB)

    Hu Fumin; Ma Xueming [Chenguan Research Institute of Chemical Industry, Chengdu (China)

    2000-03-01

    The direct and post radiation induced graft polymerization had been studied in CRICI (Chenguan Research Institute of Chemical Industry). The method consists of irradiation of various polymer substrates in the presence (or absence) of monomers in a liquid, saturated vapour or gaseous and non-saturated vapour. 1. Grafting of functional monomers. --- It is possible to divide the grafting into two main approaches for synthesis of functional polymer materials. The first is grafting of monomers attached required functional group such as unsaturated carboxylic acid (acrylic and methacrylic acid), unsaturated nitrogen containing (alkali) base (vinylpyridine), monomers with hydrophilic unionized and polar groups (acrylamide, N-vinylpyrrolidone glycidylmethacrylate) and so on. The second is grafting of monomers capable of continuing chemical modification after graft polymerization. This approach essentially expands synthetic possibility of RGP for preparing functional polymers. 2. The effect of some salts on aqueous solution graft polymerization. The grafting of AA or AAm onto PE by direct or post radiation method in the presence of Mohr's salt or cupric nitrate was studied in detail. 3. Radiation induced graft polymerization by gaseous phase of monomers. This method consists of irradiation or preirradiation of various polymer substrates in the presence (or absence for preirradiation) of monomer in a gaseous of nonsaturated vapour state. (J.P.N.)

  15. Synthetic antifreeze peptide

    OpenAIRE

    1991-01-01

    A synthetic antifreeze peptide and a synthetic gene coding for the antifreeze peptide have been produced. The antifreeze peptide has a greater number of repeating amino acid sequences than is present in the native antifreeze peptides from winter flounder upon which the synthetic antifreeze peptide was modeled. Each repeating amino acid sequence has two polar amino acid residues which are spaced a controlled distance apart so that the antifreeze peptide may inhibit ice formation. The synthetic...

  16. [SYNTHETIC PEPTIDE VACCINES].

    Science.gov (United States)

    Sergeyev, O V; Barinsky, I F

    2016-01-01

    An update on the development and trials of synthetic peptide vaccines is reviewed. The review considers the successful examples of specific protection as a result of immunization with synthetic peptides using various protocols. The importance of conformation for the immunogenicity of the peptide is pointed out. An alternative strategy of the protection of the organism against the infection using synthetic peptides is suggested.

  17. Restless legs syndrome in hemodialysis patients

    Directory of Open Access Journals (Sweden)

    Shahram Rafie

    2016-01-01

    Full Text Available Restless legs syndrome (RLS is a neurological disorder characterized by uncomfortable sensation of paresthesia in legs that subsequently causes involuntary and continuous movement of the lower limbs, especially at rest. Its prevalence in hemodialysis is more than that in the general population. Different risk factors have been suggested for RLS. We studied the prevalence and risk factors of RLS in 137 hemodialysis patients followed up at our center. The patients completed at least three months on dialysis and fulfilled four criteria for the diagnosis of RLS. We compared the patients with and without RLS, and the odds ratios (ORs were estimated by the logistic regression models. The prevalence of RLS was 36.5% in the study patients. Among the variables, diabetes was the only predicting factor for the development of RLS. The diabetic patients may be afflicted with RLS 2.25 times more than the non-diabetics. Women developed severe RLS 5.23 times more than men. Neurodegeneration, decrease in dopamine level, higher total oxidant status, and neuropathy in diabetic patients may explain the RLS symptoms.

  18. Hyperhemocysteinemia and cardiovascular risks in hemodialysis patients

    Directory of Open Access Journals (Sweden)

    Sagheb Mohammad

    2010-01-01

    Full Text Available The risk of premature and progressive occlusive vascular disease is high in chronic uremic patients, and it accounts for more than 40% of the mortality in dialysis patients. End stage renal failure (ESRF patients exhibit elevated plasma homocystein levels, about four fold as much as those in the controls, and it is now considered as a causative factor for increased risk of cardiovascular death among these patients. The aim of this study was to evaluate the relationship of total plasma homocysteine level and echocardiographic abnormalities as a surrogate of cardiac disease outcome in hemodialysis patients. 123 adult patients on maintenance hemodialysis and having echocardiography done during January till November 2006 were enrolled in this cross-sectional study. Plasma homocysteine level was directly related to the presence of aortic regur-gitation r= 0.27 P= 0.009. There were negative correlations between ejection fraction (EF, left ventricular systolic dimension (LV.S (r= - 0.71, P= 0.0001, left ventricular diastolic dimension (LV.D (r= -0.23 p= 0.01 and age (r= - 0.021 P= 0.02. In conclusion we did not find the para-doxical reverse epidemiology in our patients and plasma total homocysteine level was in direct correlation with cardiac risk factors such as left ventricular mass index and aortic regurgitation.

  19. Amyloid osteoarthropathy in long term hemodialysis patients

    International Nuclear Information System (INIS)

    Orzincolo, C.; Cardona, P.; Vita, G.; Bedani, P.L.; Farinelli, A.; Scutellari, P.N.

    1988-01-01

    The accumulation of amyloid in the bone and joint system has recently been recognized as a peculiar disease in patients undergoing long-term hemodialysis (5 years at least), especially in those who use cuprophan membranes. The pathology of amyloidosis is characterized by deposits of amyloid (β microglobulin mainly) in the bone, in the synovia, and in pericapsular soft tissues. The skeleton of 46 long-term hemodialysis patients (19 males and 27 females) was studied by X-ray; bone and joint abnormalities due to amyloid deposition were observed in 45% of cases. The shoulder, hip, and wrist were the most frequently involved joints. Destructive spondyloarthorapathy was present in 15% of cases. The radiographic patterns of AOD are generally divided into axial and peripheral lesions. In the appendicular skeleton abnormalities include: well-defined lytic areas (geodes), pathologic fractures, marginal erosions, and particular soft tissue swelling. Destructive spondyloarthropathy is frequently present in the cervical spine (85% of our cases) and is characterized by narrowing of the invertebral space, marginal erosion, and subchondral bone sclerosis of the vertebral body

  20. [Delayed graft function: a frequent but still unsolved problem in renal transplantation].

    Science.gov (United States)

    Szwarc, Ilan; Garrigue, Valérie; Delmas, Sylvie; Deleuze, Sébastien; Chong, Guillaume; Mourad, Georges

    2005-12-01

    Delayed graft function (DGF) is a frequent and well-known complication of renal transplantation, which occurs in 30% of cadaver kidney allografts. It has an economic cost that is the result of prolonged patient hospitalization and the need for hemodialysis sessions; it also increases the risk of acute allograft rejection and may affect long-term graft survival. Lots of risk factors were identified, like donor hemodynamic compromise or prolonged cold ischemia time; however, incidence of DGF remains high due to the frequent use of marginal donors due to organ shortage. Recent advances in the pathophysiology of DGF point the importance of the ischemia-reperfusion injury mechanisms and some therapeutics that may reduce them are under investigation, like the use of new solutions to improve organ preservation and the use of some antioxidant and anti-inflammatory drugs.

  1. Periorbital fat grafting.

    Science.gov (United States)

    Massry, Guy G; Azizzadeh, Babak

    2013-02-01

    Periorbital aging is a multifactorial process involving volume loss (bone and soft tissue), tissue decent, and cutaneous degenerative changes. Traditional approaches to surgery on this area of the face have been subtractive in nature, focusing on excision of skin, muscle, and fat. This has frequently led to a gaunt or hollowed postoperative appearance. Contemporary aesthetic eyelid and periorbital rejuvenation has undergone a paradigm shift from an excisionally based surgical approach to one that prioritizes volume preservation and/or augmentation. The development of fat grafting to the eyelids and periorbita has given the eyelid surgeon a viable surgical alternative to prevent postoperative volume depletion, maintain the smooth transition of the lower eyelid to the cheek, and aid in restoring the youthful appearance desired after surgery. This article will focus of periorbital fat grafting and touch upon fat preservation techniques as primary restorative procedures or as surgical adjuncts. Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.

  2. Relationship of Hemodialysis Shift With Sleep Quality and Depression in Hemodialysis Patients.

    Science.gov (United States)

    Norozi Firoz, Masomeh; Shafipour, Vida; Jafari, Hedayat; Hosseini, Seyed Hamzeh; Yazdani-Charati, Jamshid

    2017-09-01

    This descriptive correlational study was aimed at determining the relationship of hemodialysis shift with sleep quality and depression in 310 hemodialysis patients. Demographic and Clinical Questionnaires, the Pittsburgh sleep quality index, and Beck's Depression Inventory were used to ascertain the aforementioned relationship. Among the patients, 59.6% reported poor sleep quality and 44.8% reported experiencing depression. Results show that these conditions were significantly related to many factors. Although dialysis shift was not significantly related to sleep quality and depression, sleep quality was found significantly associated with age, female gender, illiteracy, unemployment, residence in rural areas, diabetes, addiction to sedatives, and phosphorus levels. A significant relationship was also found between depression and phosphorus levels. Logistic regression predicted age, gender, illiteracy, unemployment, residence in rural areas, and addiction to sedatives as factors for poor sleep quality. A body mass index (BMI) above 30, decreased urea, and increased phosphorus were predicted as factors for increased depression.

  3. Vein grafting in fingertip replantations.

    Science.gov (United States)

    Yan, Hede; Jackson, William D; Songcharoen, Somjade; Akdemir, Ovunc; Li, Zhijie; Chen, Xinglong; Jiang, Liangfu; Gao, Weiyang

    2009-01-01

    In this retrospective study, the survival rates of fingertip replantation with and without vein grafting were evaluated along with their postoperative functional and cosmetic results. One hundred twenty-one-fingertip amputations were performed in 103 patients between September 2002 and July 2007. Thirty-four amputated fingertips were replanted without vein grafting, while 87 amputated fingertips were replanted with vein grafting for arterial and/or venous repairs. The overall survival rates of the replantations with and without vein grafting were 90% (78/87) and 85% (29/34), respectively. The survival rates were 88% (36/41) with venous repair, 93% (25/27) with arterial repair, and 89% (17/19) with both. Nineteen patients without vein grafting and 48 patients with vein grafting had a follow-up period of more than one year. Good cosmetic and functional outcomes were observed in both groups of patients. The results show that vein grafting is a reliable technique in fingertip replantations, showing no significant difference (P > 0.05) in survival between those with and without vein grafting. Furthermore, no significant difference (P > 0.05) in survival was found between cases with vein grafts for arterial and/or venous repairs. In fingertip replantations with vein grafting, favorable functional and esthetic results can be achieved without sacrificing replantation survival. (c) 2009 Wiley-Liss, Inc.

  4. Bioabsorbable bypass grafts biofunctionalised with RGD have enhanced biophysical properties and endothelialisation tested in vivo

    Directory of Open Access Journals (Sweden)

    Larisa V Antonova

    2016-05-01

    Full Text Available Small diameter arterial bypass grafts are considered as unmet clinical need since the current grafts have poor patency of 25% within 5 years. We have developed a 3D scaffold manufactured from natural and synthetic biodegradable polymers, poly(3-hydroxybutyrate-co-3-hydroxyvalerate (PHBV and poly(ε-caprolactone (PCL, respectively. Further to improve the biophysical properties as well as endothelialisation, the grafts were covalently conjugated with arginine-glycine-aspartic acid (RGD bioactive peptides. The biophysical properties as well as endothelialisation of PHBV/PCL and PCL 2 mm diameter bypass grafts were assessed with and without biofunctionalisation with RGD peptides in vitro and in vivo. Morphology of the grafts was assessed by scanning electron microscopy, whereas physico-mechanical properties were evaluated using a physiological circulating system equipped with a state of art ultrasound vascular wall tracking system. Endothelialisation of the grafts in vitro and in vivo were assessed using a cell viability assay and rat abdominal aorta replacement model, respectively. The biofunctionalisation with RGD bioactive peptides decreased mean fiber diameter and mean pore area in PHBV/PCL grafts; however, this was not the case for PCL grafts. Both PHBV/PCL and PCL grafts with RGD peptides had lower durability compared to those without; these durability values were similar to those of internal mammary artery. Modification of PHBV/PCL and PCL grafts with RGD peptides increased endothelial cell viability in vitro by a factor of 8 and enhanced the formation of an endothelial cell monolayer in vivo one month postimplantation. In conclusion, PHBV/PCL small-caliber graft can be a suitable 3D scaffold for the development of a tissue engineering arterial bypass graft.

  5. Noninvasive continuous monitoring of digital pulse waves during hemodialysis

    DEFF Research Database (Denmark)

    Burkert, Antje; Scholze, Alexandra; Tepel, Martin

    2009-01-01

    Intermittent hemodynamic instability during hemodialysis treatment is a frequent complication in patients with end-stage renal failure. A noninvasive method for continuous hemodynamic monitoring is needed. We used noninvasive digital photoplethysmography and an algorithm for continuous, investiga...

  6. Hepatitis C virus infection in hemodialysis patients in Maracaibo, Venezuela

    Directory of Open Access Journals (Sweden)

    Francisca Monsalve-Castillo

    2012-02-01

    Full Text Available Over a two year period, the incidence of hepatitis C virus (HCV infection was evaluated in 29 hemodialysis patients, aged between 15 and 75 years (mean ± SD: 45 ± 39.5 years, from the University Hospital Hemodyalisis Unit, Maracaibo, Zulia State, Venezuela. Anti-HCV antibodies were determined using a fourth generation ELISA (Innotest HCV Ab IV kit and positive blood samples were tested using a recombinant assay kit (Inno-LIA HCV Ab III, both kits from Innogenetics N.V., Belgium. The findings indicate a lack of HCV seroconversion in the hemodialysis patients over the study period, confirmed by the recombinant assay. Risk factors for HCV infection were 0.3270 (95% confidence interval: 0.01323-8.080 in patients undergoing hemodialysis. The findings suggest a lack of significant sources for HCV infection due to the preventive measures to avoid its transmission in the hemodialysis unit.

  7. Inpatient Dialysis Unit Project Development: Redesigning Acute Hemodialysis Care.

    Science.gov (United States)

    Day, Jennifer

    2017-01-01

    Executive leaders of an acute care hospital performed a market and financial analysis, and created a business plan to establish an inpatient hemodialysis unit operated by the hospital to provide safe, high-quality, evidence-based care to the population of individuals experiencing end stage renal disease (ESRD) within the community. The business plan included a SWOT (Strengths - Weaknesses - Opportunities - Threats) analysis to assess advantages of the hospital providing inpatient hemodialysis services versus outsourcing the services with a contracted agency. The results of the project were a newly constructed tandem hemodialysis room and an operational plan with clearly defined key performance indicators, process improvement initiatives, and financial goals. This article provides an overview of essential components of a business plan to guide the establishment of an inpatient hemodialysis unit. Copyright© by the American Nephrology Nurses Association.

  8. The Effect of High-Flux Hemodialysis on Hemoglobin Concentrations in Patients with CKD: Results of the MINOXIS Study

    Science.gov (United States)

    Schneider, Andreas; Drechsler, Christiane; Krane, Vera; Krieter, Detlef H.; Scharnagl, Hubert; Schneider, Markus P.; Wanner, Christoph

    2012-01-01

    Summary Background and objectives Hemodialysis treatment induces markers of inflammation and oxidative stress, which could affect hemoglobin levels and the response to erythropoietin use. This study sought to determine whether high-flux dialysis would help improve markers of renal anemia, inflammation, and oxidative stress compared with low-flux dialysis. Design, settings, participants, & measurements In a prospective, controlled study, 221 patients undergoing maintenance hemodialysis and receiving darbepoetin-alfa treatment (mean age, 66 years; 55% male) from 19 centers were screened in a 20-week run-in period of low-flux hemodialysis with a synthetic dialysis membrane. Thereafter, 166 patients were enrolled and randomly assigned to receive a synthetic high-flux membrane or to continue on low-flux dialysis for 52 weeks. Data on myeloperoxidase, oxidized LDL, high-sensitivity C-reactive protein, and the Malnutrition Inflammation Score were collected at baseline and after 52 weeks; routine laboratory data, such as hemoglobin, ferritin, and albumin, and the use of darbepoetin-alfa, were also measured in the run-in period. Results After 52 weeks, the low-flux and the high-flux groups did not differ with respect to hemoglobin (mean ± SD, 11.7±0.9 g/dl versus 11.7±1.1 g/dl; P=0.62) or use of darbepoetin-alfa (mean dosage ± SD, 29.8±24.8 μg/wk versus 26.0±31.1 μg/wk; P=0.85). Markers of inflammation, oxidative stress, or nutritional status also did not differ between groups. Conclusion Over 1 year, high-flux dialysis had no superior effects on hemoglobin levels or markers of inflammation, oxidative stress, and nutritional status. These data do not support the hypothesis that enhanced convective toxin removal would improve patient outcome. PMID:22096040

  9. Complications catheter-related infections in patients on hemodialysis (septic infections of patients on hemodialysis

    Directory of Open Access Journals (Sweden)

    Knežević Violeta

    2017-01-01

    Full Text Available Introduction: Hemodialysis catheters are used for quick establishing of an adequate vascular approach, when urgent hemodialysis is indicated in time of maturation of artery-vein fistula and in patients in whom all other vascular approach have been exhausted. Although the placement of the catheter provides the necessary vascular access, carries a risk of both local-infection exit site of a catheter, as well as systemic complications, including catheter-related infection, septic thrombophlebitis, endocarditis, and other metastatic infections such as lung abscess and brain, osteomyelitis and endophthalmitis. Cases series: We have presented a retrospective series of 5 cases of hemodialysis patients hospitalized at the Clinic of Nephrology and Clinical Immunology, of the Clinical Center of Vojvodina in the period of 2010 to 2017, which have developed different complications of catheter-related infections. Three patients diagnosed with spondylodiscitis and endocarditis in two. In one patient with native valve endocarditis, due to the appearance of other complications, there was a death, while the other patients had an adequate response to therapy. Conclusion: Early recognition of potential complications of catheter-related infections to more successful treatment of these patients.

  10. Glutathione and riboflavin status in supplemented patients undergoing home nocturnal hemodialysis versus standard hemodialysis.

    Science.gov (United States)

    Kannampuzha, Jovil; Donnelly, Sandra M; McFarlane, Philip A; Chan, Christopher T; House, James D; Pencharz, Paul B; Darling, Pauline B

    2010-05-01

    Patients on conventional hemodialysis (HD) have elevated markers of oxidative stress and chronic inflammation, which may contribute to a high prevalence of cardiovascular disease. Glutathione (GSH), an important intracellular antioxidant, requires cysteine as a rate-limiting amino acid for its synthesis and riboflavin for its regeneration. We aimed to examine whether erythrocyte GSH (eGSH) concentrations and riboflavin status are influenced by the increased dialysis dose provided to vitamin-supplemented patients receiving home nocturnal hemodialysis (HNHD) (6-8 hours/session, 5-7 nights/week) compared with patients on standard hemodialysis (SHD) (4 hours/session, 3 days/week). This was a cross-sectional comparative study involving 30 patients undergoing SHD or HNHD regimens and a group of 15 healthy control subjects (HC). We measured eGSH concentration by liquid chromatography-tandem mass spectrometry, riboflavin status by eGSH reductase activity coefficient (EGRAC) as well as plasma total cysteine (Cys) and total homocysteine (Hcy), vitamin C by high-performance liquid chromatography, and C-reactive protein (CRP) by standard method. Estimated dietary protein and energy intakes were determined by 3-day food records, and nutritional status was assessed by subjective global assessment (SGA). There were no significant differences among groups in eGSH concentration, EGRAC, dietary protein intake, and SGA score. SHD patients had significantly higher plasma Cys (P patients.

  11. Influence of combination hemodialysis/hemoperfusion against score of depression in regular hemodialysis patients

    Science.gov (United States)

    Permatasari, T. D.; Thamrin, A.; Hanum, H.

    2018-03-01

    Patients with chronic kidney disease, have a higher risk for psychological distress such as anxiety, depression and cognitive decline. Combination of Hemodialysis (HD)/hemoperfusion (HP) regularly able to eliminate uremic toxin with mild-to-large molecular weight better. HD/HP can remove metabolites, toxin, and pathogenic factors and regulate the water, electrolyte and acid-base balance to improve the quality of patient’s sleep and appetite also reduces itching of the skin, which in turn improve the quality and life expectancy. This research was a cross sectional research with a pre-experimental design conducted from July to September 2015 with 17 regular hemodialysis patients as samples. Inclusion criteria were regular hemodialysis patients and willingly participated in the research. The assessmentwas conducted using BDI to assess depression. To obtained the results, data were analyzed using T-Test and showed that that the average BDI score before the combination of HD/HP 18.59±9 to 8.18±2.83 after the combination (pdepression scores in patients with regular HD.

  12. Using skeletonised grafts for coronary artery bypass grafting.

    Science.gov (United States)

    Bawany, Faizan Imran; Khan, Muhammad Shahzeb; Khan, Asadullah; Kazi, Abdul Nafey; Naeem, Muhammed

    2014-05-01

    Coronary artery bypass graft surgery relieves angina symptoms and reduces mortality among ischaemic heart disease patients. It remains the gold standard for the treatment of multi-vessel and left main coronary artery disease. It is a well-known fact that internal mammary artery conduits have excellent and long-lasting patency when used for coronary artery bypass grafting. Its supremacy is largely because it prevents atherosclerosis. The old-style internal mammary artery bypass grafting, classically known as pedicle grafting, includes a circular rim of tissue around the graft. Bilateral pedicled internal mammary arteries, especially among diabetic patients, have been reported to cause complications in the sternum like sternal osteomyelitis. In many studies it has been reported that dissection of pedicled internal mammary artery can lead to sternal devascularisation which can lead to higher incidence of infections. Considering the higher incidence of deep sternal infections in patients with double pedicled arterial grafts, dissection of internal mammary artery in skeletonised manner was proposed. In this review, we outline the advantages of skeletonised grafting with respect to incidence of sternal infection, patency rates, blood flow, post-coronary artery bypass graft pain and the length of the graft.

  13. Recurrent white thrombi formation in hemodialysis tubing: a case report

    OpenAIRE

    Sathe, Kiran P; Yeo, Wee-Song; Liu, Isaac Desheng; Ekambaram, Sudha; Azar, Mohammed; Yap, Hui-Kim; Ng, Kar-Hui

    2015-01-01

    Background While the appearance of red clots in the dialyzer is a common phenomenon in every hemodialysis unit, the occurrence of white thrombi in the tubing is relatively rare. Case presentation We describe an adolescent male with recurrent white thrombi formation in the hemodialysis tubing. This patient had chronic renal failure from focal segmental glomerulosclerosis, but was no longer nephrotic at the time of the thrombi formation. He had a history of recurrent thrombosis of his vascular ...

  14. Metabolic acidosis and its association with nutritional status in hemodialysis.

    Science.gov (United States)

    de Oliveira, Claudia Maria Costa; Vidal, Caroline Lustosa da Costa; Cristino, Eurinice Fontenele; Pinheiro, Francisco Marto Leal; Kubrusly, Marcos

    2015-01-01

    Metabolic acidosis is a common problem in dialysis patients and plays an important role in the pathogenesis of protein-energy malnutrition in these patients. To assess the prevalence of metabolic acidosis in hemodialysis and search their association with nutritional status. A cross-sectional study was performed in hemodialysis patients at a single center. Nutritional status was assessed by anthropometric, biochemical and multifrequency bioelectrical impedance analysis. Metabolic acidosis was defined as serum bicarbonate (BIC) nutritional status, inflammation and bone disease.

  15. Skin Perfusion Pressure Is a Prognostic Factor in Hemodialysis Patients

    Directory of Open Access Journals (Sweden)

    Shingo Hatakeyama

    2012-01-01

    Full Text Available Peripheral arterial disease (PAD is common in hemodialysis patients and predicts a poor prognosis. We conducted a prospective cohort study to identify risk factors for PAD including skin perfusion pressure (SPP in hemodialysis patients. The cohort included 373 hemodialysis patients among 548 patients who received hemodialysis at Oyokyo Kidney Research Institute, Hirosaki, Japan from August 2008 to December 2010. The endpoints were lower limb survival (peripheral angioplasty or amputation events and overall survival of 2 years. Our results showed that <70 mmHg SPP was a poor prognosis for the lower limb survival and overall survival. We also identified age, history of cardiovascular disease, presence of diabetes mellitus, smoking history, and SPP < 70 mmHg as independent risk factors for lower limb survival and overall survival. Then, we constructed risk criteria using the significantly independent risk factors. We can clearly stratify lower limb survival and overall survival of the hemodialysis patients into 3 groups. Although the observation period is short, we conclude that SPP value has the potential to be a risk factor that predicts both lower limb survival and the prognosis of hemodialysis patients.

  16. [The Experience of Fluid Management in Hemodialysis Patients].

    Science.gov (United States)

    Kim, Yoonsoo; Kim, Miyoung

    2015-10-01

    The purpose of this study was to explore the experience of fluid management in hemodialysis patients by describing how they manage fluid intake and what affects fluid management. Purposive sampling yielded 11 patients who have received hemodialysis for one year or longer in one general hospital. Data were collected through in-depth interviews and analysed using Giorgi's phenomenological method. Data collection and analysis were performed concurrently. The findings regarding how hemodialysis patients manage fluid intake were classified into four constituents: 'recognizing the need for fluid control', 'observing the status of fluid accumulation', 'controlling fluid intake and output', 'getting used to fluid management'. The factors that affect fluid management of hemodialysis patients were revealed as 'willpower', 'change in the mindset', 'support system', and 'emotional state'. The study results show that hemodialysis patients manage fluid intake through food and exercise as well as interpersonal relationships. These findings suggest that strategies in the development of nursing interventions for hemodialysis patients should be directed at assisting them in familiarization with fluid management based on an understanding of their sociocultural contexts.

  17. Hemodialysis Key Features Mining and Patients Clustering Technologies

    Directory of Open Access Journals (Sweden)

    Tzu-Chuen Lu

    2012-01-01

    Full Text Available The kidneys are very vital organs. Failing kidneys lose their ability to filter out waste products, resulting in kidney disease. To extend or save the lives of patients with impaired kidney function, kidney replacement is typically utilized, such as hemodialysis. This work uses an entropy function to identify key features related to hemodialysis. By identifying these key features, one can determine whether a patient requires hemodialysis. This work uses these key features as dimensions in cluster analysis. The key features can effectively determine whether a patient requires hemodialysis. The proposed data mining scheme finds association rules of each cluster. Hidden rules for causing any kidney disease can therefore be identified. The contributions and key points of this paper are as follows. (1 This paper finds some key features that can be used to predict the patient who may has high probability to perform hemodialysis. (2 The proposed scheme applies k-means clustering algorithm with the key features to category the patients. (3 A data mining technique is used to find the association rules from each cluster. (4 The mined rules can be used to determine whether a patient requires hemodialysis.

  18. Micrografts: the "super" expansion graft.

    Science.gov (United States)

    Mardovin, W; Miller, S F; Eppinger, M; Finley, R K

    1992-01-01

    A novel technique for producing micronized skin grafts that was introduced in a paper presented at the 1990 ABA meeting was evaluated to quantify maximum expansion. Twenty Sprague-Dawley rats were divided into two groups representing 10:1 and 25:1 expanded micrograft ratios, respectively. Grafted sites in both groups were shown to heal better than those of the control group, and both grafted groups showed comparable healing at day 10.

  19. The Clinical and Economic Effect of Vascular Access Selection in Patients Initiating Hemodialysis with a Catheter.

    Science.gov (United States)

    Al-Balas, Alian; Lee, Timmy; Young, Carlton J; Kepes, Jeffrey A; Barker-Finkel, Jill; Allon, Michael

    2017-12-01

    Patients in the United States frequently initiate hemodialysis with a central venous catheter (CVC) and subsequently undergo placement of a new arteriovenous fistula (AVF) or arteriovenous graft (AVG). Little is known about the clinical and economic effects of initial vascular access choice. We identified 479 patients starting hemodialysis with a CVC at a large medical center (during 2004-2012) who subsequently had an AVF ( n =295) or AVG ( n =105) placed or no arteriovenous access (CVC group, n =71). Compared with patients receiving an AVG, those receiving an AVF had more frequent surgical access procedures per year (1.01 [95% confidence interval, 0.95 to 1.08] versus 0.62 [95% confidence interval, 0.55 to 0.70]; P access procedures per year. Patients receiving an AVF had a higher median annual cost (interquartile range) of surgical access procedures than those receiving an AVG ($4857 [$2523-$8835] versus $2819 [$1411-$4274]; P access procedures was similar in both groups. The AVF group had a higher median overall annual access-related cost than the AVG group ($10,642 [$5406-$19,878] versus $6810 [$3718-$13,651]; P =0.001) after controlling for patient age, sex, race, and diabetes. The CVC group had the highest median annual overall access-related cost ($28,709 [$11,793-$66,917]; P access-related procedures and complications is higher in patients who initially receive an AVF versus an AVG. Copyright © 2017 by the American Society of Nephrology.

  20. PPS-PEG surface coating to reduce thrombogenicity of small diameter ePTFE vascular grafts.

    Science.gov (United States)

    Karrer, L; Duwe, J; Zisch, A H; Khabiri, E; Cikirikcioglu, M; Napoli, A; Goessl, A; Schaffner, T; Hess, O M; Carrel, T; Kalangos, A; Hubbell, J A; Walpoth, B H

    2005-10-01

    Patency failure of small vascular synthetic grafts is still a major problem for coronary and peripheral revascularization. Thus, three new surface coatings of small synthetic grafts were tested in an acute pig model to evaluate their thrombogenicity (extracorporeal arterio-venous shunt) and in a chronic rat model to evaluate the tissue reaction they induced (subcutaneous implantation). In five domestic pigs (25-30 kg) an extracorporeal femoro-femoral arterio-venous shunt model was used. The study protocol included first a non-heparinized perfusion sequence followed by graft perfusion after 10,000 UI iv heparin. Grafts were perfused for 3 and 9 minutes. The following coatings were tested on ePTFE grafts: poly-propylene sulphide (PPS)--poly-ethylene glycol (PEG) (wet and dry applications) as well as carbon. Two sets of control were used, one dry and one wet (vehicle only). After perfusion grafts were examined by scanning electron microscopy for semi-quantitative assessment (score 0-3) of cellular and microthrombi deposition. To assess tissue compatibility, pieces of each material were implanted subcutaneously in 16 Wistar rats. At 2, 4, 8, 12 weeks four animals each were sacrificed for semi-quantitative (score 0-3) histologic evaluation of tissue reaction. In the pig model, cellular deposition and microthrombi formation increased over time. In non- heparinized animals, the coatings did not improve the surface characteristics, since they did not prevent microthrombi formation and cellular deposition. In heparinized animals, thrombogenicity was lowest in coated grafts,especially in PPS -PEG dry (pPPS-PEG dry, but this difference was not statistically significant vs.controls. In the rat model,no significant differences of the tissue reaction could be shown between materials. While all coatings failed to add any benefit for lowering tissue reaction, surface coating with PPS -PEG (dry application) reduced thrombogenicity significantly (in heparinized animals) and thus

  1. Outcome after VAC® therapy for infected bypass grafts in the lower limb.

    Science.gov (United States)

    Acosta, S; Monsen, C

    2012-09-01

    To assess the outcome of vacuum-assisted wound closure (VAC(®)) therapy for infected bypass grafts. A retrospective 7-year review of patient records from 2004 to 2011 of all patients receiving VAC(®) therapy for infected bypass grafts. Thirty-seven patients with 42 wounds and 45 infected bypass (28 synthetic) grafts received VAC(®) treatment. Two serious bleeding episodes from the suture lines occurred. The median VAC(®) therapy time was 20 days. The proportion of patent bypass grafts was 91% (41/45) at a median time of 3.5 months from the start of VAC(®) therapy. Five patients with seven bypasses had persistent infection or re-infection, and the total graft preservation rate was 76% (34/45). The median follow-up time was 15 months. The presence of two infected bypass grafts in one groin wound was associated with an increased major amputation rate (hazard ratio (HR) 7.4 [95% confidence interval (CI) 2.0-27.5]), and synthetic graft infection (HR 5.0 [95% CI 1.5-17.4]) and non-healed wound (HR 3.6 [95% CI 1.5-8.7]) were associated with mortality. VAC(®) therapy of infected bypass grafts was able to induce effective wound healing without compromising the early bypass function. Two infected synthetic bypasses in the wound were associated with the highest risk of adverse outcome. Copyright © 2012 European Society for Vascular Surgery. Published by Elsevier Ltd. All rights reserved.

  2. Environmental application of radiation grafting

    International Nuclear Information System (INIS)

    Tamada, Masao

    2007-01-01

    Adsorbent having high selectivity against a certain metal ion was synthesized by means of radiation-induced graft polymerization for the purpose of environmental application. The resulting adsorbents were utilized for the removal of toxic metal from scallop waste and the collection of uranium from seawater. As a novel application of grafting, the biodegradability of poly-hydroxybutylate was controlled by grafting. The biodegradability could be depressed by the graft chain and then recovered by external stimuli such as thermal and chemical treatments. (author)

  3. Management Strategies in Hemodialysis Vascular Access

    NARCIS (Netherlands)

    J. van der Linden (Joke)

    2006-01-01

    textabstractSince the introduction of the AV fistula and the use of interposition graft little improvement has been made in the vascular access field. Still, vascular access related complications, are one of the most important reasons for patient hospitalization, morbidity and even mortality

  4. Genistein Modified Polymer Blends for Hemodialysis Membranes

    Science.gov (United States)

    Chang, Teng; Kyu, Thein; Define, Linda; Alexander, Thomas

    2012-02-01

    A soybean-derived phytochemical called genistein was used as a modifying agent to polyether sulfone/polyvinyl pyrrolidone (PES/PVP) blends to produce multi-functional hemodialysis membranes. With the aid of phase diagrams of PES/PVP/genistein blends, asymmetric porous membranes were fabricated by coagulating in non-solvent. Both unmodified and genistein modified PES/PVP membranes were shown to be non-cytotoxic to the blood cells. Unmodified PES/PVP membranes were found to reduce reactive oxygen species (ROS) levels, whereas the genistein modified membranes exhibited suppression for ˜60% of the ROS levels. Also, the genistein modified membranes revealed significant suppression of pro-inflammatory cytokines: IL-1β, IL-6, and TNF-α. Moreover, addition of PVP to PES showed the reduced trend of platelet adhesion and then leveled off. However, the modified membranes exhibited suppression of platelet adhesion at low genistein loading, but beyond 15 wt%, the platelet adhesion level rised up.

  5. Intradialytic exercise programs for hemodialysis patients.

    Science.gov (United States)

    Jung, Tae-Du; Park, Sun-Hee

    2011-08-01

    Although it is widely accepted that exercise is beneficial in patients with end-stage renal disease as in the general population, it is not easy to incorporate exercise programs into routine clinical practice. This review aimed to investigate the beneficial effects of exercise during hemodialysis and also to introduce various intradialytic exercise programs and their advantages as a first step in combining exercise programs into clinical practice. Aerobic and resistance exercise are beneficial not only in improving physical functioning, including maximal oxygen uptake and muscle strength, but also in improving anthropometrics, nutritional status, hematological indexes, inflammatory cytokines, depression, and health-related quality of life. However, it is not clear whether the beneficial effects of exercise are limited to only relatively healthy dialysis patients. Therefore, the effects of individualized exercise programs for elderly patients or patients with comorbid conditions need to be studied further.

  6. Organization of a Regional Hemodialysis Center

    Directory of Open Access Journals (Sweden)

    D. G. Dantsiger

    2006-01-01

    Full Text Available The paper presents a concept of formation and development of interregional, regional, and equated centers, interregional specialized units set up on the basis of therapeutic-and-prophylactic institutions on the basis of a multileveled multistage health care system. Large multidisciplinary clinical hospital One (Novokuznetsk was used as an example to consider the mechanism of integration of innovation technology of organizing a specialized medical aid. Analysis of the needs of the region’s population for dialysis care for patients with acute and chronic renal failure has revealed the barest necessity of setting up a regional hemodyalisis center under a multidisciplinary clinical hospital. The setting up of a hemodialysis center substantially has quantitatively and qualitatively improved health care delivered to patients with acute and chronic renal failure.

  7. Urgent peritoneal dialysis or hemodialysis catheter dialysis.

    Science.gov (United States)

    Lok, Charmaine E

    2016-03-01

    Worldwide, there is a steady incident rate of patients with end-stage kidney disease (ESKD) who require renal replacement therapy. Of these patients, approximately one-third have an "unplanned" or "urgent" start to dialysis. This can be a very challenging situation where patients have either not had adequate time for education and decision making regarding dialysis modality and appropriate dialysis access, or a decision was made and plans were altered due to unforeseen circumstances. Despite such unplanned starts, clinicians must still consider the patient's ESKD "life-plan", which includes the best initial dialysis modality and access to suit the patient's individual goals and their medical, social, logistic, and facility circumstances. This paper will discuss the considerations of peritoneal dialysis and a peritoneal dialysis catheter access and hemodialysis and central venous catheter access in patients who require an urgent start to dialysis.

  8. Hemodialysis catheter implantation in the axillary vein by ultrasound guidance versus palpation or anatomical reference

    Directory of Open Access Journals (Sweden)

    Restrepo Valencia CA

    2013-10-01

    Full Text Available Cesar A Restrepo Valencia,1 Carlos A Buitrago Villa,1 Jose A Chacon Cardona21Internal Medicine, Nephrology, 2Epidemiology, Caldas University, Manizales, ColombiaBackground: We compared the results of four different methods of hemodialysis catheter insertion in the medial segment of the axillary vein: ultrasound guidance, palpation, anatomical reference, and prior transient catheter.Methods: All patients that required acute or chronic hemodialysis and for whom it was determined impossible or not recommended either to place a catheter in the internal jugular vein (for instance, those patients with a tracheostomy, or to practice arteriovenous fistula or graft; it was then essential to obtain an alternative vascular access. When the procedure of axillary vein catheter insertion was performed in the Renal Care Facility (RCF, ultrasound guidance was used, but in the intensive care unit (ICU, this resource was unavailable, so the palpation or anatomical reference technique was used.Results: Two nephrologists with experience in the technique performed 83 procedures during a period lasting 15 years and 8 months (from January 1997–August 2012: 41 by ultrasound guidance; 19 by anatomical references; 15 by palpation of the contiguous axillary artery; and 8 through a temporary axillary catheter previously placed. The ultrasound-guided patients had fewer punctures than other groups, but the value was not statistically significant. Arterial punctures were infrequent in all techniques. Analyzing all the procedure-related complications, such as hematoma, pneumothorax, brachial-plexus injury, as well as the reasons for catheter removal, no differences were observed among the groups. The functioning time was longer in the ultrasound-guided and previous catheter groups. In 15 years and 8 months of surveillance, no clinical or image evidence for axillary vein stenosis was found.Conclusion: The ultrasound guide makes the procedure of inserting catheters in the

  9. Effect of hemodialysis on protein synthesis.

    Science.gov (United States)

    Löfberg, E; Essén, P; McNurlan, M; Wernerman, J; Garlick, P; Anderstam, B; Bergström, J; Alvestrand, A

    2000-10-01

    Earlier studies have shown that hemodialysis (HD) treatment stimulates net protein catabolism. Several factors associated with HD affect protein catabolism, such as an inflammatory effect due to blood-membrane contact and loss of amino acids and glucose into the dialysate. We have studied protein synthesis in skeletal muscle of healthy volunteers (n = 9) before and after a single heparin-free HD. Protein synthesis (PS) was studied, using 2 independent techniques: the incorporation of labeled 2H5-phenylalanine into muscle protein, which gives a quantitative measure of the fractional synthesis rate of muscle proteins, and the concentration and size distribution of ribosomes, which gives a qualitative estimate of protein synthesis. Furthermore, free amino acid concentrations were determined in muscle and plasma. The rate of PS, expressed as the fractional synthesis rate, decreased by 13% during HD (p muscle free amino acid concentrations were determined at four time points; before and after the phenylalanine incorporation period, before dialysis and before and after the second incorporation period after dialysis. Immediately after dialysis, there was a decrease in plasma asparagine, histidine, alanine, taurine, valine and tryptophane. In muscle, no changes occurred except for a slight increase in leucine after dialysis. In blood, the glucose concentration decreased and the total amount of glucose lost to the dialysate was 21 +/- 3.0 g. In summary, one single hemodialysis treatment decreases fractional protein synthesis rate in skeletal muscle. The results demonstrate substantial losses of amino acids and glucose to the dialysate and decreased amino acid concentrations in plasma, but only minimal changes in the intracellular amino acid concentrations in muscle, suggesting that the decreased PS is caused not by lack of amino acid precursors at the site of the synthesis activity, but by other mechanisms.

  10. Analysis of urea distribution volume in hemodialysis.

    Science.gov (United States)

    Maduell, F; Sigüenza, F; Caridad, A; Miralles, F; Serrato, F

    1994-01-01

    According to the urea kinetic model it is considered that the urea distribution volume (V) is that of body water, and that it is distributed in only one compartment. Since the V value is different to measure, it is normal to use 58% of body weight, in spite of the fact that it may range from 35 to 75%. In this study, we have calculated the value of V by using an accurate method based on the total elimination of urea from the dialysate. We have studied the V, and also whether the different dialysis characteristics modify it. Thirty-five patients were included in this study, 19 men and 16 women, under a chronic hemodialysis programme. The dialysate was collected in a graduated tank, and the concentration of urea in plasma and in dialysate were determined every hour. Every patient received six dialysis sessions, changing the blood flow (250 or 350 ml/min), the ultrafiltration (0.5 or 1.5 l/h), membrane (cuprophane or polyacrylonitrile) and/or buffer (bicarbonate or acetate). At the end of the hemodialysis session, the V value ranged from 43 to 72% of body weight; nevertheless, this value was practically constant in every patient. The V value gradually increased throughout the dialysis session, 42.1 +/- 6.9% of body weight in the first hour, 50.7 +/- 7.5% in the second hour and 55.7 +/- 7.9% at the end of the dialysis session. The change of blood flow, ultrafiltration, membrane or buffer did not alter the results. The V value was significantly higher in men in comparison with women, 60.0 +/- 6.6% vs. 50.5 +/- 5.9% of body weight (p < 0.001).

  11. Acoustical bubble trapper applied to hemodialysis.

    Science.gov (United States)

    Palanchon, P; Birmelé, B; Tranquart, F

    2008-04-01

    Gaseous microemboli can arise in extracorporeal lines and devices such as dialysis machines. They are associated with severe pulmonary side effects in patients undergoing chronic hemodialysis sessions. The goal of this study was to develop a gaseous emboli trapper using ultrasound waves to remove any air bubble from the tubing system before they reach the patient. A homemade bubble trapper, developed in the laboratory, consists of a Perspex block containing a main channel connected to the tubing of a hemodialysis machine and a second subchannel positioned perpendicularly to the main one, used to trap the air microemboli. The microemboli flowing in the main channel were insonified through an acoustic window with an ultrasound wave, at a frequency of 500 kHz and with a maximal acoustic pressure of 500 kPa, generated by a single-element transducer positioned 3 cm away from the main flow. The radiation force induced by the ultrasound beam acts directly on the flowing air emboli, by pushing them into the subchannel. Two Doppler probes operating both at 2 MHz, connected to a DWL Doppler machine were placed before and after the bubble trapper to count sequentially the number of embolic events. The flow of the machine was varied between 200 mL/min and 500 mL/min. Depending on the flow velocity, the number of microembolic signals (MES) detected by the Doppler probes before and after the trapping system was identical and ranged from 5 to 150 MES/min in absence of the ultrasound irradiation. When the air bubble trapper was activated, a reduction of the number of MES, up to 70%, was achieved. Doppler recordings suggest that the circulating bubbles were either fragmented into smaller bubble fragments or directly got pushed into the second subchannel where they were collected. This simple approach using an ultrasound-based trapping system was shown to operate adequately with the current settings and can be used to filter air microemboli.

  12. Tough and Sustainable Graft Block Copolymer Thermoplastics

    Energy Technology Data Exchange (ETDEWEB)

    Zhang, Jiuyang; Li, Tuoqi; Mannion, Alexander M.; Schneiderman, Deborah K.; Hillmyer, Marc A.; Bates, Frank S. (UMM)

    2016-03-15

    Fully sustainable poly[HPMC-g-(PMVL-b-PLLA)] graft block copolymer thermoplastics were prepared from hydroxypropyl methylcellulose (HPMC), β-methyl-δ-valerolactone (MVL), and l-lactide (LLA) using a facile two-step sequential addition approach. In these materials, rubbery PMVL functions as a bridge between the semirigid HPMC backbone and the hard PLLA end blocks. This specific arrangement facilitates PLLA crystallization, which induces microphase separation and physical cross-linking. By changing the backbone molar mass or side chain composition, these thermoplastic materials can be easily tailored to access either plastic or elastomeric behavior. Moreover, the graft block architecture can be utilized to overcome the processing limitations inherent to linear block polymers. Good control over molar mass and composition enables the deliberate design of HPMC-g-(PMVL-b-PLLA) samples that are incapable of microphase separation in the melt state. These materials are characterized by relatively low zero shear viscosities in the melt state, an indication of easy processability. The simple and scalable synthetic procedure, use of inexpensive and renewable precursors, and exceptional rheological and mechanical properties make HPMC-g-(PMVL-b-PLLA) polymers attractive for a broad range of applications.

  13. Body Composition Monitor Assessing Malnutrition in the Hemodialysis Population Independently Predicts Mortality

    NARCIS (Netherlands)

    Rosenberger, Jaroslav; Kissova, Viera; Majernikova, Maria; Straussova, Zuzana; Boldizsar, Jan

    Objective: Malnutrition is a known predictor of mortality in the general and hemodialysis populations. However, diagnosing malnutrition in dialysis patients remains problematic. Body composition monitoring (BCM) is currently used mainly for assessing overhydratation in hemodialysis patients, but it

  14. Engineering the mechanical and biological properties of nanofibrous vascular grafts for in situ vascular tissue engineering.

    Science.gov (United States)

    Henry, Jeffrey J D; Yu, Jian; Wang, Aijun; Lee, Randall; Fang, Jun; Li, Song

    2017-08-17

    Synthetic small diameter vascular grafts have a high failure rate, and endothelialization is critical for preventing thrombosis and graft occlusion. A promising approach is in situ tissue engineering, whereby an acellular scaffold is implanted and provides stimulatory cues to guide the in situ remodeling into a functional blood vessel. An ideal scaffold should have sufficient binding sites for biomolecule immobilization and a mechanical property similar to native tissue. Here we developed a novel method to blend low molecular weight (LMW) elastic polymer during electrospinning process to increase conjugation sites and to improve the mechanical property of vascular grafts. LMW elastic polymer improved the elasticity of the scaffolds, and significantly increased the amount of heparin conjugated to the micro/nanofibrous scaffolds, which in turn increased the loading capacity of vascular endothelial growth factor (VEGF) and prolonged the release of VEGF. Vascular grafts were implanted into the carotid artery of rats to evaluate the in vivo performance. VEGF treatment significantly enhanced endothelium formation and the overall patency of vascular grafts. Heparin coating also increased cell infiltration into the electrospun grafts, thus increasing the production of collagen and elastin within the graft wall. This work demonstrates that LMW elastic polymer blending is an approach to engineer the mechanical and biological property of micro/nanofibrous vascular grafts for in situ vascular tissue engineering.

  15. In vitro mineralisation of grafted ePTFE membranes carrying carboxylate groups

    Directory of Open Access Journals (Sweden)

    Norsyahidah Mohd Hidzir

    2017-03-01

    Full Text Available In vitro mineralisation in simulated body fluid (SBF of synthetic polymers continues to be an important area of research as the outcomes cannot be predicted. This study evaluates a series of ePTFE membranes grafted with carboxylate-containing copolymers, specifically using acrylic acid and itaconic acid for grafting. The samples differ with regards to graft density, carboxylate density and polymer topology. The type and amount of mineral produced in 1.5 × SBF was dependent on the sample characteristics as evident from XPS, SEM/EDX, and FTIR spectroscopy. It was found that the graft density affects the mineral phases that form and that low graft density appear to cause co-precipitation of calcium carbonate and calcium phosphate. Linear and branched graft copolymer topology led to hydroxyapatite mineralisation whereas crosslinked graft copolymers resulted in formation of a mixture of calcium-phosphate phases. This study demonstrates that in vitro mineralisation outcomes for carboxylate-containing graft copolymers are complex. The findings of this study have implications for the design of bioactive coatings and are important for understanding the bone-biomaterial interface.

  16. The Association of Long-Functioning Hemodialysis Vascular Access with Prevalence of Left Ventricular Hypertrophy in Kidney Transplant Recipients

    Directory of Open Access Journals (Sweden)

    Aureliusz Kolonko

    2014-01-01

    Full Text Available Left ventricular hypertrophy (LVH is frequently observed in chronic dialysis patients and is also highly prevalent in kidney transplant recipients. This study evaluates the impact of long-functioning hemodialysis vascular access on LVH in single center cohort of kidney transplant recipients. 162 patients at 8.7 ± 1.8 years after kidney transplantation were enrolled. Echocardiography, carotid ultrasound, and assessment of pulse wave velocity were performed. LVH was defined based on left ventricular mass (LVM indexed for body surface area (BSA and height2.7. There were 67 patients with and 95 without patent vascular access. Both study groups were comparable with respect to gender, age, duration of dialysis therapy, and time after transplantation, kidney graft function, and cardiovascular comorbidities. Patients with patent vascular access were characterized by significantly elevated LVM and significantly greater percentage of LVH, based on LVMI/BSA (66.7 versus 48.4%, P=0.02. OR for LVH in patients with patent vascular access was 2.39 (1.19–4.76, P=0.01. Regression analyses confirmed an independent contribution of patent vascular access to higher LVM and increased prevalence of LVH. We concluded that long-lasting patent hemodialysis vascular access after kidney transplantation is associated with the increased prevalence of LVH in kidney transplant recipients.

  17. Suction blister grafting - Modifications for easy harvesting and grafting

    Directory of Open Access Journals (Sweden)

    2012-01-01

    Full Text Available Suction blister grafting is a simple modality of treatment of patients with resistant and stable vitiligo. But raising the blisters may be time consuming and transferring to the recipient site may be difficult as the graft is ultrathin. By doing some modifications we can make the technique simpler and easier. We can decrease the blister induction time by intradermal injection of saline, exposure to Wood′s lamp, intrablister injection of saline. By these methods we can decrease the blister induction time from 2-3 hrs to 45-90 minutes. After harvesting the graft, it can be transferred to the recipient area by taking the graft on a sterile glass slide, on the gloved finger, rolling the graft over a sterile syringe and then spreading on the recipient area, or taking on the sterile wrapper of paraffin dressing and then placing over the recipient area.

  18. [From synthetic biology to synthetic humankind].

    Science.gov (United States)

    Nouvel, Pascal

    2015-01-01

    In this paper, we propose an historical survey of the expression "synthetic biology" in order to identify its main philosophical components. The result of the analysis is then used to investigate the meaning of the notion of "synthetic man". It is shown that both notions share a common philosophical background that can be summed up by the short but meaningful assertion: "biology is technology". The analysis allows us to distinguish two notions that are often confused in transhumanist literature: the notion of synthetic man and the notion of renewed man. The consequences of this crucial distinction are discussed. Copyright © 2015 Académie des sciences. Published by Elsevier SAS. All rights reserved.

  19. Synthetic Cathinones ("Bath Salts")

    Science.gov (United States)

    ... cathinones? Behavioral therapy can be used to treat addiction to synthetic cathinones. Examples include: cognitive-behavioral therapy contingency management, or motivational incentives—providing rewards to ...

  20. Bone Grafts in Jaw Cysts- Hydroxyapatite & Allogenic Bone – A Comparative Study

    Directory of Open Access Journals (Sweden)

    Showkat Mamun

    2009-11-01

    Full Text Available Background: Auto bone is the gold standard in bone grafting. However, the morbidity and additional surgical time associated with its collection, as well as the limited supply, have stimulated the search for substitutes. Allograft is more limited than autograft because it yields more variable clinical results. Composite synthetic grafts offer an alternative because Hydroxyapatite is chemically identical to the inorganic matrix of living bones and it can be processed synthetically. The intent was to evaluate these two graft materials for clinical use and to provide an insight on the different grafting strategies to enhance bone formation. Objective: To find out the bone healing process and the prognostic value for the patient using hydroxyapatite alloplastic material and allogenic bone graft. Method: Total 28 patients were included in the study after the clinical and radiological evaluation where 14 cases were treated with allogenic-bone graft and rest 14 cases were treated with hydroxyapatite alloplastic material after enucleation of the cystic lesion in random manner. The integration of hydroxyapatite and allogenic bone was assessed with postoperative lesion diameter, trabecular pattern, histopathological and scintigraphic examination of the successful graft cases. Statistical analysis was carried out by ‘unpaired T test' and ‘Chi square' test. Result: The radiological, histopathological and scintigraphical outcome of the patients treated with hydroxyaptite granule bone graft were clinically and statistically superior in comparison with those who were treated with allogenic bone graft. Conclusion: This safe and osteoconductive hydroxyapatite appears suitable for filling bone defects and bone cavities, showing less resorption and a rapid osseous integration. Key words: Hydroxyapatite; allogenic bone; scintigraphy; radiology; histopathology.DOI: 10.3329/bsmmuj.v2i1.3707 BSMMU J 2009; 2(1: 25-30

  1. Osteoinductive potential of a novel biphasic calcium phosphate bone graft in comparison with autographs, xenografts, and DFDBA.

    Science.gov (United States)

    Miron, Richard J; Sculean, Anton; Shuang, Yang; Bosshardt, Dieter D; Gruber, Reinhard; Buser, Daniel; Chandad, Fatiha; Zhang, Yufeng

    2016-06-01

    Since the original description of osteoinduction in the early 20th century, the study and development of innovative biomaterials has emerged. Recently, novel synthetic bone grafts have been reported with potential to form ectopic bone in vivo. However, their full characterization in comparison with other leading bone grafts has not been investigated. The aim of this study was to determine the osteoinductive potential of bone grafts by comparing autogenous bone grafts, demineralized freeze-dried bone allografts (DFDBA), a commonly utilized natural bone mineral (NBM) from bovine origin (Bio-Oss), and a newly developed biphasic calcium phosphate (BCP). Grafts were compared in vitro for their ability to stimulate bone marrow stromal cell (BMSC) migration, proliferation, and differentiation as assessed by quantitative real-time PCR for genes coding for bone markers including Runx2, collagen I, and osteocalcin. Furthermore, bone grafts were implanted in the calf muscle of 12 beagle dogs to determine their potential to form ectopic bone in vivo. The in vitro results demonstrate that both autografts and DFDBA show potential for cell recruitment, whereas only autografts and BCP demonstrated the ability to differentiate BMSCs toward the osteoblast lineage. The in vivo ectopic bone model demonstrated that while NBM particles were not osteoinductive and autogenous bone grafts were resorbed quickly in vivo, ectopic bone formation was reported in DFDBA and in synthetic BCP grafts. The modifications in nanotopography and chemical composition of the newly developed BCP bone grafts significantly promoted ectopic bone formation confirming their osteoinductive potential. In conclusion, the results from this study provide evidence that synthetic bone grafts not only serve as a three-dimensional scaffold but are also able to promote osteoinduction. © 2015 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.

  2. 2,3-Diphosphoglyceric Acid Changes in Uremia and During Hemodialysis

    OpenAIRE

    Kang, Sung Kyew; Park, Sung Kwang

    1986-01-01

    The present study is an investigation of the mechanism of changes in erythrocyte 2,3-diphosphoglyceric acid (2,3-DPG) in patients with chronic renal failure during hemodialysis. The study was conducted on 7 Korean and 6 American patients on maintenance hemodialysis. The plasma pH of Korean patients was 7.31±0.02 before hemodialysis and 7.40±0.04 after hemodialysis (p

  3. The relationship between emotional intelligence and quality of life hemodialysis patients

    OpenAIRE

    Masoome Shahnavazi; Zohreh Parsa Yekta; Fatemeh Rigi; Mir Saeed Yekaninejad

    2016-01-01

    Hemodialysis treatment methods in patients with chronic kidney failure increase the life span of these patients, but hemodialysis affects all life aspects of patients and diminishes the quality of life patients. The aim of the study was to examine the relationship between emotional intelligence and quality of life for hemodialysis patients . This study was a descriptive – correlational research conducted in 2014 on 98 hemodialysis patients Referred to Hospitals of University Medical Sci...

  4. Vacuum-assisted closure therapy for vascular graft infection (Szilagyi grade III) in the groin-a 10-year multi-center experience.

    Science.gov (United States)

    Verma, Himanshu; Ktenidis, Kiriakos; George, Robbie K; Tripathi, Ramesh

    2015-06-01

    The aim of the study was to evaluate the benefit of vacuum-assisted closure (VAC) therapy in the management of deep, alloplastic graft infections (Szilagyi grade III) in the groin. From 2000 to 2009, we identified and included in our study 72 deep inguinal infections in 68 patients, involving native as well as synthetic graft or patch material. There were 29 early graft infections (infections (≥30 days after implantation). Among these, 17 cases involved native grafts/patches (12 grafts and 5 patches), while 55 cases involved non-native grafts/patches [26 polytetrafluorethylene (PTFE) grafts and 24 Dacron grafts (Haemashield, Meadox Medical, Boston Scientific Corporation, Natick, NY; Gelsoft graft, Vascutek, Inchinnan, Renfrewshire, Scotland, UK; Intervascular, Mahwah, NJ); INVISTA, and 5 Vascu-Guard(™) bovine pericardial patches; Synovis Surgical Innovation]. All patients were treated with multiple wound debridements, graft salvage, sartorius myoplasty, intravenous antibiotics and VAC therapy until thorough surface healing was achieved. Exclusion criteria were an alloplastic graft infection with proximal expansion above the inguinal ligament, blood culture positive for septicaemia or septic anastomotic herald or overt bleeding. Nine months after initiation of therapy, overall, graft/patch salvage was achieved in 61 of 72 (84·7%) cases. Of the native graft/patch group, infected graft material was replaced with an autogenous great saphenous vein graft or patch in four patients (23·5%). In the non-native group, vein or synthetic graft preservation without revision was achieved in 48 of 55 (87·3%) patients. The mean duration of VAC therapy was 16 ± 7·7 days, and postoperative mean hospital stay was 25·3 ± 8·5 days. In 23 of 72 (31·9%) cases, a secondary closure of the wound was achieved; in the other 49 cases, wound healing was achieved by meshed split-thickness skin grafting. Mean wound healing time for all wounds was 24·3 ± 12·5 days. Specific

  5. Knowledge and Practice of Hemodialysis Amongst Dialysis Nurses.

    Science.gov (United States)

    Manandhar, Dhiraj Narayan; Chhetri, Pramod Kumar; Poudel, Prakash; Baidya, Samir Keshari; Agrawaal, Krishna Kumar

    2017-01-01

    Dialysis nurses should have a good knowledge regarding hemodialysis treatment. The status of Nepalese dialysis nurses on this aspect is unknown. This study was done to assess the knowledge and practice on different aspects of the hemodialysis treatment. We distributed validated questionnaires to the participants in a biannual conference in Kathmandu on 24th September as most of the dialysis nurses attend the event. We calculated mean and standard deviation for continuous variables and frequencies and percentage for the responses and compared counseling with different parameters. Total 94 out of 116 participants who were giving care to dialysis patients were in the study. Total 39 (42%) received formal nursing training in hemodialysis and 71 (78%) respondents always counseled patients regarding fluid intake. A total of 37 (96%) trained nurses always counseled the importance of regular dialysis. Seventy-six (81.7%) respondents did counseling on vaccination against Hepatitis B. Counseling on vaccination against influenza and pneumococcus was 47 (50%). When comparing educational status, respondents below bachelor level did more frequent counseling than level above (P=0.03). All the respondents knew the importance of hand washing and BP monitoring during hemodialysis. Ninety-one (96.7%) respondents knew how to deal with BP changes during hemodialysis. Seventy-three (77.6%) respondents were very confident on managing complications. Only 31 (33%) respondents knew how to deal with patients on continuous ambulatory peritoneal dialysis. Dialysis nurses have knowledge on basic procedures of hemodialysis but there is a space for improvement in dealing with complications to provide quality service to hemodialysis patients.

  6. Bone grafting options in children.

    Science.gov (United States)

    Betz, Randal R; Lavelle, William F; Samdani, Amer F

    2010-08-01

    Retrospective review of the literature. To review the current literature as well as recent trends in bone grafting techniques available for children. The currently accepted gold standard in bone grafting for adolescent idiopathic scoliosis (AIS) is autogenous iliac crest. Due to questions concerning complications such as donor site pain, other options have been explored, including various allograft sources, demineralized bone matrix, and bone morphogenetic protein. A review of the current medical literature was completed and additional case examples are presented. A review of the literature reveals that up to 31% of patients have persistent pain at 2 years post surgery when autogenous iliac crest bone graft is harvested. Allograft supplementation of local autograft has been demonstrated in the literature to be as effective as autogenous iliac crest bone grafting in contributing to a successful posterior spinal fusion in patients with AIS. Modern demineralized bone matrix formulations have been found in both animal models as well as in a recent retrospective clinical review to contribute to a successful posterior spinal fusion in AIS. Bone morphogenetic protein has been shown to contribute to a successful posterior spinal fusion in complex pediatric spinal deformity patients. At 2 years follow-up, patients who underwent a posterior instrumented spinal fusion that was not augmented with any bone graft appear to have successful spinal fusions. Although autogenous iliac bone graft remains the benchmark to which bone grafting materials are compared, other options including the placement of no bone graft at all provides similar fusion rates in patients with AIS.

  7. Efficiency of acidemia correction on intermittent versus continuous hemodialysis in acute methanol poisoning

    Czech Academy of Sciences Publication Activity Database

    Zakharov, S.; Pelclová, D.; Navrátil, Tomáš; Běláček, J.; Latta, J.; Písař, M.; Rulíšek, J.; Lepš, J.; Zídek, P.; Kučera, C.; Boček, R.; Mazur, M.; Belik, Z.; Chalupa, J.; Talafa, V.; Kodras, K.; Nalos, D.; Sedlak, C.; Šenkyřík, M.; Šmíd, J.; Šálek, T.; Roberts, D. M.; Hovda, K. E.

    2017-01-01

    Roč. 55, č. 2 (2017), s. 123-132 ISSN 1556-3650 Institutional support: RVO:61388955 Keywords : Acidemia * continuous veno-venous hemodialysis * extended daily hemodialysis * intermittent hemodialysis * metabolic acidosis * methanol poisoning Subject RIV: CF - Physical ; Theoretical Chemistry OBOR OECD: Physical chemistry Impact factor: 3.677, year: 2016

  8. Efficiency of acidemia correction on intermittent versus continuous hemodialysis in acute methanol poisoning

    Czech Academy of Sciences Publication Activity Database

    Zakharov, S.; Pelclová, D.; Navrátil, Tomáš; Běláček, J.; Latta, J.; Písař, M.; Rulíšek, J.; Lepš, J.; Zídek, P.; Kučera, C.; Boček, R.; Mazur, M.; Belik, Z.; Chalupa, J.; Talafa, V.; Kodras, K.; Nalos, D.; Sedlak, C.; Šenkyřík, M.; Šmíd, J.; Šálek, T.; Roberts, D. M.; Hovda, K. E.

    2017-01-01

    Roč. 55, č. 2 (2017), s. 123 -132 ISSN 1556-3650 Institutional support: RVO:61388955 Keywords : Acidemia * continuous veno-venous hemodialysis * extended daily hemodialysis * intermittent hemodialysis * metabolic acidosis * methanol poisoning Subject RIV: CF - Physical ; Theoretical Chemistry OBOR OECD: Physical chemistry Impact factor: 3.677, year: 2016

  9. The Language of Coping: Understanding Filipino Geriatric Patients' Hemodialysis Lived Experiences

    Science.gov (United States)

    de Guzman, Allan B.; Chy, Mark Anthony S.; Concepcion, April Faye P.; Conferido, Alvin John C.; Coretico, Kristine I.

    2009-01-01

    The majority of patients with chronic kidney disease (CKD) are undergoing maintenance hemodialysis. Hemodialysis is a process of removing metabolic waste, other poisons, and excess fluids from the blood and replacing essential blood constituents through a dialysis machine. With hemodialysis causing stress not only to physical status but also to…

  10. Radiation grafting on natural films

    Science.gov (United States)

    Lacroix, M.; Khan, R.; Senna, M.; Sharmin, N.; Salmieri, S.; Safrany, A.

    2014-01-01

    Different methods of polymer grafting using gamma irradiation are reported in the present study for the preparation of newly functionalized biodegradable films, and some important properties related to their mechanical and barrier properties are described. Biodegradable films composed of zein and poly(vinyl alcohol) (PVA) were gamma-irradiated in presence of different ratios of acrylic acid (AAc) monomer for compatibilization purpose. Resulting grafted films (zein/PVA-g-AAc) had their puncture strength (PS=37-40 N mm-1) and puncture deformation (PD=6.5-9.8 mm) improved for 30% and 50% PVA in blend, with 5% AAc under 20 kGy. Methylcellulose (MC)-based films were irradiated in the presence of 2-hydroxyethyl methacrylate (HEMA) or silane, in order to determine the effect of monomer grafting on the mechanical properties of films. It was found that grafted films (MC-g-HEMA and MC-g-silane) using 35% monomer performed higher mechanical properties with PS values of 282-296 N mm-1 and PD of 5.0-5.5 mm under 10 kGy. Compatibilized polycaprolactone (PCL)/chitosan composites were developed via grafting silane in chitosan films. Resulting trilayer grafted composite film (PCL/chitosan-g-silane/PCL) presented superior tensile strength (TS=22 MPa) via possible improvement of interfacial adhesion (PCL/chitosan) when using 25% silane under 10 kGy. Finally, MC-based films containing crystalline nanocellulose (CNC) as a filling agent were prepared and irradiated in presence of trimethylolpropane trimethacrylate (TMPTMA) as a grafted plasticizer. Grafted films (MC-g-TMPTMA) presented superior mechanical properties with a TS of 47.9 MPa and a tensile modulus (TM) of 1792 MPa, possibly due to high yield formation of radicals to promote TMPTMA grafting during irradiation. The addition of CNC led to an additional improvement of the barrier properties, with a significant 25% reduction of water vapor permeability (WVP) of grafted films.

  11. Quantum synthetic aperture radar

    Science.gov (United States)

    Lanzagorta, Marco; Jitrik, Oliverio; Uhlmann, Jeffrey; Venegas-Andraca, Salvador E.

    2017-05-01

    Synthetic aperture radar (SAR) uses sensor motion to generate finer spatial resolution of a given target area. In this paper we explore the theoretical potential of quantum synthetic aperture quantum radar (QSAR). We provide theoretical analysis and simulation results which suggest that QSAR can provide improved detection performance over classical SAR in the high-noise low-brightness regime.

  12. Designing synthetic biology.

    Science.gov (United States)

    Agapakis, Christina M

    2014-03-21

    Synthetic biology is frequently defined as the application of engineering design principles to biology. Such principles are intended to streamline the practice of biological engineering, to shorten the time required to design, build, and test synthetic gene networks. This streamlining of iterative design cycles can facilitate the future construction of biological systems for a range of applications in the production of fuels, foods, materials, and medicines. The promise of these potential applications as well as the emphasis on design has prompted critical reflection on synthetic biology from design theorists and practicing designers from many fields, who can bring valuable perspectives to the discipline. While interdisciplinary connections between biologists and engineers have built synthetic biology via the science and the technology of biology, interdisciplinary collaboration with artists, designers, and social theorists can provide insight on the connections between technology and society. Such collaborations can open up new avenues and new principles for research and design, as well as shed new light on the challenging context-dependence-both biological and social-that face living technologies at many scales. This review is inspired by the session titled "Design and Synthetic Biology: Connecting People and Technology" at Synthetic Biology 6.0 and covers a range of literature on design practice in synthetic biology and beyond. Critical engagement with how design is used to shape the discipline opens up new possibilities for how we might design the future of synthetic biology.

  13. Mortality risk in hemodialysis patients with increased arterial stiffness is reduced by attainment of classical clinical performance measures

    DEFF Research Database (Denmark)

    Scholze, Alexandra; Thies, Christina; Cheikhalfraj, Mohamed

    2009-01-01

    We determined whether attainment of classical clinical performance measures for hemodialysis care improves survival in hemodialysis patients with increased arterial stiffness.......We determined whether attainment of classical clinical performance measures for hemodialysis care improves survival in hemodialysis patients with increased arterial stiffness....

  14. The Effect of the Type of Hemodialysis Buffer on the QTc Interval in Patients on Chronic Hemodialysis

    Directory of Open Access Journals (Sweden)

    Reza Hekmat

    2009-03-01

    Full Text Available Background: Identifying the sources of variation in QTc measurementsis important for preventing arrhythmias during and afterhemodialysis. The present study was designed to determine thecorrelation between the type of hemodialysis buffer and thechanges in QTc interval in patients on chronic hemodialysis.Methods: Fifty-nine patients on chronic hemodialysis whoreferred in winter 2007 to hemodialysis centers of Ghaem andHashemi Nejad hospitals, in Mashhad, Iran, were divided intotwo groups according to their last dialysate buffer: acetate orbicarbonate. Electrocardiography, arterial blood gas parameters,serum K+, Na+, ionized calcium, and albumin levels weremeasured prior to and after hemodialysis in all patients.Results: All arterial blood gas parameters and serum electrolytesconcentrations were increased except K+ levels that weresignificantly decreased with hemodialysis. PCO2 and QTc intervalswere slightly increased in all patients, however thisincrease was not statistically significant. We found that thetype of dialysate affected the QTc interval, HCO3, base excess,base excess of extra cellular fluid, and base bufferchanges with no effect on ionized calcium, pH, PCO2, andserum albumin concentration. QTc interval was prolonged byusing bicarbonate and shortened by using acetate dialysatebuffer. We found no correlation between the variations of QTcinterval and serum electrolytes or arterial blood gas parametersin either group.Conclusion: Bicarbonate buffer use in hemodialysis prolongedQTc interval and acetate buffer shortened it. This effectis independent of serum electrolytes and pH changes duringhemodialysis. The effect of bicarbonate buffer is probablydue to more tolerability of ultra filtration, more effectiveedema reduction and augmented body electro-conductivity.

  15. [Assessment of nutritional status in patients with chronic kidney disease on maintance hemodialysis].

    Science.gov (United States)

    Mikolašević, Ivana; Orlić, Lidija; Vidrih, Suzana; Poje, Berislav; Bubić, Ivan; Vujičić, Božidar; Rački, Sanjin

    2014-04-01

    It is well established that nutritional status is an important factor affecting the outcome and recovery from disease or injury. Assessment of nutritional status is an integral part of care for patients with chronic kidney disease, especially for those treated with dialysis procedures. According to available literature, 18%-80% of patients on dialysis have some form of nutritional deficiency. Furthermore, in patients treated with dialysis procedures there is a rule called 'reverse epidemiology', according which patients with better nutritional status have better survival rate. Therefore, nutritional assessment should detect malnutrition and rate the overall nutritional status of each patient through clinical data categories: medical history, physical examination, nutrition physical examination, psychosocial history, demographics, physical activity, and current medical/surgical issues. Consequently, the main aim of our study was to analyze the nutritional status of our patients treated with hemodialysis procedures. Another aim was to analyze the applicability of measuring skinfold by caliper as a method of nutritional status assessment. During a six-month period, we analyzed 129 patients (57.4% of men and 42.6% of women), mean age 68.1 ± 12.4 years, treated with hemodialysis procedures (24.8% of patients were treated with online hemodiafiltration and 75.2% with standard, conventional hemodialysis) as the method of choice of renal replacement therapy (RRT) for more than 6 months. All patients were dialyzed three times a week for four hours on biocompatible synthetic membranes. The patients treated with online hemodiafiltration were dialyzed on high-flux helixone membranes, while those treated with standard, conventional hemodialysis were dialyzed on polysulfone membranes and helixone low-flux membranes. The mean time of RRT was 71.2 ± 56.7 months. During the study period, in each patient we followed medical history, and clinical and laboratory parameters of

  16. Epidemiology, surveillance, and prevention of bloodstream infections in hemodialysis patients.

    Science.gov (United States)

    Patel, Priti R; Kallen, Alexander J; Arduino, Matthew J

    2010-09-01

    Infections cause significant morbidity and mortality in patients undergoing hemodialysis. Bloodstream infections (BSIs) are particularly problematic, accounting for a substantial number of hospitalizations in these patients. Hospitalizations for BSI and other vascular access infections appear to have increased dramatically in hemodialysis patients since 1993. These infections frequently are related to central venous catheter (CVC) use for dialysis access. Regional initiatives that have shown successful decreases in catheter-related BSIs in hospitalized patients have generated interest in replicating this success in outpatient hemodialysis populations. Several interventions have been effective in preventing BSIs in the hemodialysis setting. Avoiding the use of CVCs in favor of access types with lower associated BSI risk is among the most important. When CVCs are used, adherence to evidence-based catheter insertion and maintenance practices can positively influence BSI rates. In addition, facility-level surveillance to detect BSIs and stimulate examination of vascular access use and care practices is essential to a comprehensive approach to prevention. This article describes the current epidemiology of BSIs in hemodialysis patients and effective prevention strategies to decrease the incidence of these devastating infections.

  17. Longitudinal study of leptin levels in chronic hemodialysis patients

    Directory of Open Access Journals (Sweden)

    Averbukh Zhan

    2011-06-01

    Full Text Available Abstract Background The influence of serum leptin levels on nutritional status and survival in chronic hemodialysis patients remained to be elucidated. We conducted a prospective longitudinal study of leptin levels and nutritional parameters to determine whether changes of serum leptin levels modify nutritional status and survival in a cohort of prevalent hemodialysis patients. Methods Leptin, dietary energy and protein intake, biochemical markers of nutrition and body composition (anthropometry and bioimpedance analysis were measured at baseline and at 6, 12, 18 and 24 months following enrollment, in 101 prevalent hemodialysis patients (37% women with a mean age of 64.6 ± 11.5 years. Observation of this cohort was continued over 2 additional years. Changes in repeated measures were evaluated, with adjustment for baseline differences in demographic and clinical parameters. Results Significant reduction of leptin levels with time were observed (linear estimate: -2.5010 ± 0.57 ng/ml/2y; p Conclusions Thus leptin levels reflect fat mass depots, rather than independently contributing to uremic anorexia or modifying nutritional status and/or survival in chronic hemodialysis patients. The importance of such information is high if leptin is contemplated as a potential therapeutic target in hemodialysis patients.

  18. Increased bone fractures among elderly United States hemodialysis patients.

    Science.gov (United States)

    Wagner, John; Jhaveri, Kenar D; Rosen, Lisa; Sunday, Suzanne; Mathew, Anna T; Fishbane, Steven

    2014-01-01

    Fractures are an important cause of morbidity in hemodialysis patients. Multiple advances in the treatment of mineral and bone disease in hemodialysis patients have occurred. The purpose of this study was to determine whether the rate of fractures in hemodialysis patients has changed over time. We studied US Renal Data System (USRDS) datasets to determine the rates of hospitalized fractures among hemodialysis patients. The primary outcome was incidence of fractures requiring hospitalization. The fracture rate per 1000 person-years was calculated by year from 1992 to 2009. The first 90 days after initiating dialysis were excluded from analysis. The incidence of hip and vertebral fractures increased from 12.5 fractures per 1000 patient-years in 1992 to 25.3 per 1000 patient-years in 2004 (P fractures increased from 3.2 per 1000 patient-years in 1992 to 7.7 per 1000 patient-years in 2009 (P fracture rate was seen in white patients >65 years of age. After 2004, the incidence rate of these fractures stabilized and subtly declined, but did not decrease significantly. Fracture rates increased significantly in hemodialysis patients from 1992 to 2004, with most of the increase occurring in elderly white patients. Assessment of fracture risk and management in dialysis patients at greatest risk requires greater emphasis and further study.

  19. Evaluation of neopterin levels in patients undergoing hemodialysis.

    Science.gov (United States)

    Asci, Ali; Baydar, Terken; Cetinkaya, Ramazan; Dolgun, Anil; Sahin, Gonul

    2010-04-01

    Neopterin is a diagnostic or a prognostic biomarker for several pathologies including renal diseases. However, the association between neopterin status and causative main reasons such as diabetes and hypertension for renal disease remains unclear. The aim of the study was to evaluate neopterin levels in diabetes and hypertension patients treated with/without hemodialysis. According to primary renal disorders, the patients undergoing hemodialysis were classified into 4 groups as diabetic nephropathy, hypertensive nephropathy, reflux nephropathy or interstitial nephritis, and others. The controls consisted of healthy subjects, hypertensive subjects, and diabetic individuals without any renal disorder. In the study, both urinary and serum neopterin levels were measured using high performance liquid chromatography and enzyme-linked immunosorbant assay in patients undergoing regular hemodialysis therapy (n=71). The effects of the duration of hemodialysis and treatment of erythropoietin and/or iron on neopterin levels were also evaluated. Neopterin levels were found to be higher in hemodialysis patients than in the healthy controls (P<0.05). A significant difference in neopterin levels was also found between diabetic control patients and diabetic nephropathy patients (P<0.05). A similar significant difference was detected in neopterin levels between hypertensive patients with/without nephropathy (P<0.05). Neopterin may be an early critical marker for progression of nephropathy in diabetic and hypertensive patients in early stages.

  20. Osteoinduction of bone grafting materials for bone repair and regeneration.

    Science.gov (United States)

    García-Gareta, Elena; Coathup, Melanie J; Blunn, Gordon W

    2015-12-01

    Regeneration of bone defects caused by trauma, infection, tumours or inherent genetic disorders is a clinical challenge that usually necessitates bone grafting materials. Autologous bone or autograft is still considered the clinical "gold standard" and the most effective method for bone regeneration. However, limited bone supply and donor site morbidity are the most important disadvantages of autografting. Improved biomaterials are needed to match the performance of autograft as this is still superior to that of synthetic bone grafts. Osteoinductive materials would be the perfect candidates for achieving this task. The aim of this article is to review the different groups of bone substitutes in terms of their most recently reported osteoinductive properties. The different factors influencing osteoinductivity by biomaterials as well as the mechanisms behind this phenomenon are also presented, showing that it is very limited compared to osteoinductivity shown by bone morphogenetic proteins (BMPs). Therefore, a new term to describe osteoinductivity by biomaterials is proposed. Different strategies for adding osteoinductivity (BMPs, stem cells) to bone substitutes are also discussed. The overall objective of this paper is to gather the current knowledge on osteoinductivity of bone grafting materials for the effective development of new graft substitutes that enhance bone regeneration. Copyright © 2015 Elsevier Inc. All rights reserved.

  1. Graft intolerance syndrome requiring graft nephrectomy after late kidney graft failure: can it be predicted? A retrospective cohort study.

    Science.gov (United States)

    Bunthof, Kim L W; Verhoeks, Carmen M; van den Brand, Jan A J G; Hilbrands, Luuk B

    2018-02-01

    Graft nephrectomy is recommended in case of early graft failure. When the graft fails more than 3-6 months after transplantation, it is current practice to follow a wait-and-see policy. A common indication for graft removal is the graft intolerance syndrome. We aimed to create a risk prediction model for the occurrence of graft intolerance resulting in graft nephrectomy. We collected data of kidney transplantations performed in our center between 1980 and 2010 that failed at least 6 months after transplantation. We evaluated the association between baseline characteristics and the occurrence of graft nephrectomy because of graft intolerance using a competing risk regression model. Prognostic factors were included in a multivariate prediction model. In- and exclusion criteria were met in 288 cases. In 48 patients, the graft was removed because of graft intolerance. Donor age, the number of rejections, and shorter graft survival were predictive factors for graft nephrectomy because of the graft intolerance syndrome. These factors were included in a prediction rule. Using donor age, graft survival, and the number of rejections, clinicians can predict the need for graft nephrectomy with a reasonable accuracy. © 2017 Steunstichting ESOT.

  2. In vitro and ex vivo hemocompatibility of off-the-shelf modified poly(vinyl alcohol) vascular grafts

    OpenAIRE

    Cutiongco, Marie Francene A.; Anderson, Deirdre E. J.; Hinds, Monica T.; Yim, Evelyn K. F.

    2015-01-01

    Synthetic small diameter vascular grafts with mechanical properties of native arteries, resistance to thrombosis and capacity to stimulate in situ endothelialization are an unmet clinical need. Poly(vinyl alcohol) hydrogel (PVA) is an excellent candidate as a vascular graft due to its tunable mechanical properties. However, the hydrophilicity and bio-inertness of PVA prevents endothelialization in vivo. We hypothesize that the modification of PVA with biomolecules and topographies creates a h...

  3. Establishing Core Outcome Domains in Hemodialysis: Report of the Standardized Outcomes in Nephrology-Hemodialysis (SONG-HD) Consensus Workshop.

    Science.gov (United States)

    Tong, Allison; Manns, Braden; Hemmelgarn, Brenda; Wheeler, David C; Evangelidis, Nicole; Tugwell, Peter; Crowe, Sally; Van Biesen, Wim; Winkelmayer, Wolfgang C; O'Donoghue, Donal; Tam-Tham, Helen; Shen, Jenny I; Pinter, Jule; Larkins, Nicholas; Youssouf, Sajeda; Mandayam, Sreedhar; Ju, Angela; Craig, Jonathan C

    2017-01-01

    Evidence-informed decision making in clinical care and policy in nephrology is undermined by trials that selectively report a large number of heterogeneous outcomes, many of which are not patient centered. The Standardized Outcomes in Nephrology-Hemodialysis (SONG-HD) Initiative convened an international consensus workshop on November 7, 2015, to discuss the identification and implementation of a potential core outcome set for all trials in hemodialysis. The purpose of this article is to report qualitative analyses of the workshop discussions, describing the key aspects to consider when establishing core outcomes in trials involving patients on hemodialysis therapy. Key stakeholders including 8 patients/caregivers and 47 health professionals (nephrologists, policymakers, industry, and researchers) attended the workshop. Attendees suggested that identifying core outcomes required equitable stakeholder engagement to ensure relevance across patient populations, flexibility to consider evolving priorities over time, deconstruction of language and meaning for conceptual consistency and clarity, understanding of potential overlap and associations between outcomes, and an assessment of applicability to the range of interventions in hemodialysis. For implementation, they proposed that core outcomes must have simple, inexpensive, and validated outcome measures that could be used in clinical care (quality indicators) and trials (including pragmatic trials) and endorsement by regulatory agencies. Integrating these recommendations may foster acceptance and optimize the uptake and translation of core outcomes in hemodialysis, leading to more informative research, for better treatment and improved patient outcomes. Copyright © 2016 National Kidney Foundation, Inc. Published by Elsevier Inc. All rights reserved.

  4. Synthetic virology: engineering viruses for gene delivery.

    Science.gov (United States)

    Guenther, Caitlin M; Kuypers, Brianna E; Lam, Michael T; Robinson, Tawana M; Zhao, Julia; Suh, Junghae

    2014-01-01

    The success of gene therapy relies heavily on the performance of vectors that can effectively deliver transgenes to desired cell populations. As viruses have evolved to deliver genetic material into cells, a prolific area of research has emerged over the last several decades to leverage the innate properties of viruses as well as to engineer new features into them. Specifically, the field of synthetic virology aims to capitalize on knowledge accrued from fundamental virology research in order to design functionally enhanced gene delivery vectors. The enhanced viral vectors, or 'bionic' viruses, feature engineered components, or 'parts', that are natural (intrinsic to viruses or from other organisms) and synthetic (such as man-made polymers or inorganic nanoparticles). Various design strategies--rational, combinatorial, and pseudo-rational--have been pursued to create the hybrid viruses. The gene delivery vectors of the future will likely criss-cross the boundaries between natural and synthetic domains to harness the unique strengths afforded by the various functional parts that can be grafted onto virus capsids. Such research endeavors will further expand and enable enhanced control over the functional capacity of these nanoscale devices for biomedicine. © 2014 Wiley Periodicals, Inc.

  5. [Can the hemodialysis strategy influence the nutritional status of hemodialysis patients?].

    Science.gov (United States)

    Chazot, Charles

    2009-07-01

    Malnutrition is frequent in hemodialysis (HD) patients. The HEMO study has shown a progressive decline of nutritional markers, such as body weight, albuminemia and protein intake, in prevalent hemodialysis patients during a 3-year follow-up. In incident dialysis patients, nutritional status usually improves during the first year of HD treatment. Opposite to the HEMO findings, we have shown that nutritional stability was achieved during a 5 year follow-up with sequential long hour dialysis (3 x 6-8 hours/week). Energy and protein intakes are related to the dialysis dose. Moreover, several studies show the nutritional consequences of changing the dialysis prescriptions. The switch from conventional HD to short daily dialysis improves significantly protein and energy intake and albuminemia. Also, increasing treatment time increases significantly the body weight after several months. One of the hypothesis for this effect is that uremia-related middle molecules compromise the patient appetite. Increasing dialysis time or frequency may decrease the level or the time of exposition to these molecules. However, the beneficial effect of hemodiafiltration on HD patients' nutritional status is not spectacular. Another hypothesis is the role of extra-cellular fluid excess and its relationship with inflammation that is deleterious for nutrition. In conclusion, dialysis adequacy is a mandatory prerequisite when facing a malnourished HD patient. Increasing time or frequency must be part of the therapeutic thought in such situation.

  6. Transcaval Access for TAVR Across a Polyester Aortic Graft

    Science.gov (United States)

    Lederman, Robert J.; O’Neill, William W.; Greenbaum, Adam B.

    2015-01-01

    Transcaval access to the aorta allows transcatheter aortic valve replacement in patients without other good access options. The resulting aortocaval fistula is closed with a nitinol cardiac occluder device. There is no experience traversing a synthetic aortic graft to perform transcaval access and closure. We describe a patient who underwent successful traversal of a polyester aortic graft using radiofrequency energy applied from the tip of a guidewire, to allow retrograde transcatheter aortic valve replacement from a femoral vein, along with details of our technique. The patient did well and was discharged home after 3 days. There was residual aortocaval fistulous flow immediately after implantation of a polyester-seeded nitinol muscular ventricular septal defect occluder device, but this fistula spontaneously occluded within one month. PMID:25510917

  7. Graft nephrectomy: The SGPGI experience

    Directory of Open Access Journals (Sweden)

    Nand Kishore Arvind

    2002-01-01

    Full Text Available Background: Graft nephrectomy is often considered a hazardous procedure with high morbidity and occasional mortality, and this may pose a technical challenge. The aim of this study was to evaluate the indications, etiology and complications following graft nephrectomy. Materials and Methods: From 1988 to 2001, among total of 1,019 live related renal transplants carried at our center, 46 underwent graft nephrectomy. Patients were divided into 2 groups depending on timing of graft re-moval. The early group included 27 patients (within 2 months of transplantation while in late group (graft re-moval after 2 months of transplantation there were 19 patients. The 2 groups were compared in terms of indica-tion, etiology and complications. Results: In early group the indications for graft removal were acute rejection, thrombosis/infarction and hyper-acute rejection, while in late group the indications were pain, hematuria, fever, hypertension and infection along with chronic failure. Overall, the external iliac artery in-jury occurred in I and 4 patients in early and late group respectively. Major blood loss occurred in I and 6 pa-tients in early and late graft removal respectively. There were 2 deaths in early group due to ftdminant pneumoni-tis that progressed to sepsis and disseminated intravascu-lar coagulation. There were 9 major wound infections all in early group except in 2 patients of late group. Respira-tory infections occurred in 14 patients in early group and 1 in late group. In early group patients had CNS compli-cations in form of seizures, clinical depression and delusional psychosis in 12 patients. Conclusions: Our experience highlights the risk in-volved in graft nephrectomies. Severe acute rejection and thrombosis lead to early graft nephrectomies. Pain, hematuria, infection and hypertension in setting of chronic rejection are predominant causes for the delayed graft ne- phrectomies. Early graft nephrectomy, though technically easy, is

  8. Pharmacokinetics of amikacin during hemodialysis and peritoneal dialysis

    DEFF Research Database (Denmark)

    Regeur, L; Colding, H; Jensen, H

    1977-01-01

    The pharmacokinetics of amikacin were examined in six bilaterally nephrectomized patients undergoing hemodialysis and in four patients with a minimal residual renal function undergoing peritoneal dialysis. The mean elimination half-life before the dialysis was 86.5 h in the anephric patients and 44...... renal function. During hemodialysis the half-life decreased to less than 10% (5.6 h) of the pretreatment value. The effectiveness of peritoneal dialysis was less as the half-life decreased to only about 30% (17.9 h) of the pretreatment value. During the dialyses a significant correlation between...... the half-life of amikacin and the decrease in blood urea and serum creatinine was demonstrated. The pharmacokinetic data were used to make dosage regimen recommendations for the treatment of patients undergoing intermittent hemodialysis or peritoneal dialysis....

  9. Graft union formation in Douglas-fir.

    Science.gov (United States)

    D.L. Copes

    1969-01-01

    Greenhouse-grown Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) graft unions were examined between 2 and 84 days after grafting. Room temperature was maintained at 60-70 F throughout the growing season. In most respects grafts of Douglas-fir followed development patterns previously reported for spruce and pine grafts, but specific differences...

  10. Grafting compatibility between selected rootstocks and Tanzanian ...

    African Journals Online (AJOL)

    The grafted seedlings with graft union tied using grafting clips were healed in a dark chamber for three days and then in a transparent chamber for three days. The average temperature and relative humidity in both chambers were maintained at 21-30°C and 85-95 %, respectively. The grafted seedlings were hardened for ...

  11. Synthetic biological networks

    International Nuclear Information System (INIS)

    Archer, Eric; Süel, Gürol M

    2013-01-01

    Despite their obvious relationship and overlap, the field of physics is blessed with many insightful laws, while such laws are sadly absent in biology. Here we aim to discuss how the rise of a more recent field known as synthetic biology may allow us to more directly test hypotheses regarding the possible design principles of natural biological networks and systems. In particular, this review focuses on synthetic gene regulatory networks engineered to perform specific functions or exhibit particular dynamic behaviors. Advances in synthetic biology may set the stage to uncover the relationship of potential biological principles to those developed in physics. (review article)

  12. Synthetic Base Fluids

    Science.gov (United States)

    Brown, M.; Fotheringham, J. D.; Hoyes, T. J.; Mortier, R. M.; Orszulik, S. T.; Randles, S. J.; Stroud, P. M.

    The chemical nature and technology of the main synthetic lubricant base fluids is described, covering polyalphaolefins, alkylated aromatics, gas-to-liquid (GTL) base fluids, polybutenes, aliphatic diesters, polyolesters, polyalkylene glycols or PAGs and phosphate esters.Other synthetic lubricant base oils such as the silicones, borate esters, perfluoroethers and polyphenylene ethers are considered to have restricted applications due to either high cost or performance limitations and are not considered here.Each of the main synthetic base fluids is described for their chemical and physical properties, manufacture and production, their chemistry, key properties, applications and their implications when used in the environment.

  13. Electrocardiographic manifestations of hyperkalemia in hemodialysis patients

    Directory of Open Access Journals (Sweden)

    Nemati Eghlim

    2010-01-01

    Full Text Available This study was performed to evaluate whether any electrocardiogram (ECG para-meter can predict the presence of hyperkalemia in patients on maintenance hemodialysis (HD. In January 2006, we conducted a cross-sectional study of 80 stable patients with end-stage renal disease from four university-based HD units of Tehran, Iran, receiving conventional thrice-weekly HD. Pre-HD serum electrolyte values and conventional 12-lead ECG were obtained from each pa-tient. Bivariate linear regression was used for assessing relationship of the study variables with hyperkalemia (K + > 5.2 mg/dL. Multivariable logistic regression was used for evaluating inde-pendent relationship between decreased T wave duration (≤ 170 ms and other variables. Bivariate correlation analysis showed a significant inverse correlation between serum potassium concentration and T wave duration (P < 0.05. None of the patients with serum potassium of ≥ 5.6 mg/dL had T wave duration > 200 ms. Multivariate logistic analysis, after adjustment for other factors, also showed a significant relationship between decreased T wave duration (≤ 170 ms and hyper-kalemia. We conclude that although hyperkalemia does not induce the usual ECG changes in HD patients, decreased T wave duration was found to be a good indicator of this lethal condition.

  14. Hemodialysis using a valveless pulsatile blood pump.

    Science.gov (United States)

    Lee, Kyungsoo; Mun, Cho Hae; Lee, Sa Ram; Min, Byoung Goo; Yoo, Kyu Jae; Park, Yong Woo; Won, Yong Soon

    2008-01-01

    Research on pulsatile blood pumps for extracorporeal life support has been widely performed because of the proven advantageous effects of blood pulsation. However, studies on the use of pulsatile blood pumps for hemodialysis are limited, although available evidence demonstrates that pulsatile blood flow has a positive influence on dialysis outcome. Therefore, the authors designed a new pulsatile pump, which is characterized by minimal-occlusion of blood-containing tubing, no requirement for valves, and no blood flow regurgitation. In-vitro hemolysis tests were conducted using fresh bovine blood, and the normalized index of hemolysis was adopted to compare blood traumas induced by the devised pulsatile pump and a conventional roller pump. In addition, experimental hemodialyses with a canine renal failure model were performed using the devised pump. Normalized index of hemolysis levels obtained was much smaller for the devised pulse pump (45 +/- 21 mg/100 L) than for the roller pump (103 +/- 10 mg/100 L), and no technical problems were encountered during dialysis sessions. Blood and dialysate flow rates were maintained at predetermined values and molecular removal was satisfactory. Postdialysis urea and creatinine reduction ratios were 61.8% +/- 10.6% and 57.4% +/- 9.0%, respectively. Pulsatile flow has usually been generated using pulsatile devices containing valves, but the valves cause concern in terms of the clinical applications of these devices. However, the described pulsatile pump does not require valves, and yet no blood flow regurgitation was observed.

  15. Malnutrition predicting factors in hemodialysis patients.

    Science.gov (United States)

    Jahromi, Soodeh Razeghi; Hosseini, Saeed; Razeghi, Effat; Meysamie, Ali pasha; Sadrzadeh, Haleh

    2010-09-01

    Malnutrition is a predictor of increased mortality in chronic hemodialysis (HD) patients. Various factors may contribute to malnutrition in these patients including energy and protein intake, inflammation, and comorbidity. To determine the importance of these factors in malnutrition of chronic HD patients, we studied 112 chronic HD patients in two centers was evaluated with the Dialysis Malnutrition Score (DMS) and anthropometric and biochemical indices. Seventy six (67.8%) patients were classified as malnourished. According to DMS score, poor protein intake (r= -0.34, Penergy intake (r= - 0.18, Pmalnutrition in descending order of importance. Multiple regression analysis showed that only poor protein intake was the explanatory variable of anthropometric measurements decline including body mass index, triceps skin fold thick-ness, mid arm circumference, mid arm muscle circumference, fat free mass, fat mass, albumin, creatinine and transferrine. None of the mentioned factors predicted the decrease of biochemical markers. We conclude that the frequency of malnutrition is high in our population and poor protein intake is the primary contributing factor for this condition. Therefore, providing enough protein may be a simple and effective way in preventing malnutrition in these patients.

  16. Trace elements in renal disease and hemodialysis

    International Nuclear Information System (INIS)

    Miura, Yoshinori; Nakai, Keiko; Suwabe, Akira; Sera, Koichiro

    2002-01-01

    A number of considerations suggest that trace element disturbances might occur in patients with renal disease and in hemodialysis (HD) patients. Using particle induced X-ray emission, we demonstrated the relations between serum concentration, urinary excretion of the trace elements and creatinine clearance (Ccr) in randomized 50 patients. To estimate the effects of HD, we also observed the changes of these elements in serum and dialysis fluids during HD. Urinary silicon excretion decreased, and serum silicon concentration increased as Ccr decreased, with significant correlation (r=0.702, p<0.001 and r=0.676, p<0.0001, respectively). We also observed the increase of serum silicon, and the decrease of silicon in dialysis fluids during HD. These results suggested that reduced renal function and also dialysis contributed to silicon accumulation. Although serum selenium decreased significantly according to Ccr decrease (r=0.452, p<0.01), we could detect no change in urinary selenium excretion and no transfer during HD. Serum bromine and urinary excretion of bromine did not correlate to Ccr. However we observed a bromine transfer from the serum to the dialysis fluid that contributed to the serum bromine decrease in HD patients

  17. Association of leptin with hemodialysis-related muscle cramps: a cross-sectional study.

    Science.gov (United States)

    Hung, Chung-Ying; Chen, Yung-Liang; Chen, Chiou-Shya; Yang, Chwei-Shiun; Peng, Sheng-Jeng

    2009-01-01

    The mechanism of muscle cramp in hemodialysis patients is not well understood. Leptin, a middle molecule uremic toxin, is able to affect neuronal activity. This study aimed to determine the association between leptin and hemodialysis-related muscle cramps. A total of 79 hemodialysis patients were enrolled. The episodes of hemodialysis-related muscle cramps were recorded over a 28-day period. Serum levels of leptin were measured on the 15th day, a mid-week dialysis session. Frequent hemodialysis-related cramps were associated with old age and elevated serum leptin levels. The risk of frequent hemodialysis-related cramps increased with increasing tertiles of leptin concentration. This relationship remained significant after adjustment for age, mean ultrafiltration ratio, gender, body mass index, insulin, resistin, c-reactive protein, albumin, peripheral arterial disease, electrolytes, and beta(2)-microglobulin. Leptin levels are associated with frequent hemodialysis-related cramps. Further studies are necessary to elucidate the underlying mechanisms.

  18. Frequency of nursing care of vascular access in hemodialysis patients

    Directory of Open Access Journals (Sweden)

    Iman Taghizade Firoozjayi

    2016-03-01

    Full Text Available Background: Hemodialysis is a critical treatment method, which depends on the vascular access route. Lack of care for the vascular access route could diminish its efficiency in a short time. Regarding this, the present study aimed to evaluate the frequency of nursing care for vascular access route in the hemodialysis patients. Methods: This cross-sectional study was conducted on 20 nurses and 120 hemodialysis patients, who referred to the Hemodialysis Department of Shahid Beheshti Hospital, Babol, Iran, in 2015. The method of nursing care for vascular access route was evaluated using a researcher-made checklist. The data analysis was performed using the descriptive statistics in the SPSS version 16. Results: In total, 14 cases of nursing care were evaluated, in 100% of which all the caring steps, including wearing gloves and a mask, early bolus injections of heparin, washing the catheter tubing, frequent monitoring of blood pressure, rinsing the catheter tubing, returning the blood to the body after hemodialysis, and sterile covering of the puncture site, were observed. However, some of the other techniques, such as the care related to appropriate pump speed when starting the dialysis machine (81.66%, observance of the needle distance from fistula (75.83%, appropriate placement of catheter (75%, pressing the injection site (54.17%, blood pressure monitoring at the end of dialysis (50%, and change of the needle site between two sessions (27.5%, were not adhered to by the nurses. Conclusion: According to the results of this study, some of the nursing care steps, which are necessary in the beginning and end of the hemodialysis, were not accurately followed by the nurses. It is recommended that constant training courses be held for the nurses in this regard.

  19. Synthesis and Properties of Carbon Nanotube-Grafted Silica Nanoarchitecture-Reinforced Poly(Lactic Acid

    Directory of Open Access Journals (Sweden)

    Yao-Wen Hsu

    2017-07-01

    Full Text Available A novel nanoarchitecture-reinforced poly(lactic acid (PLA nanocomposite was prepared using multi-walled carbon nanotube (MWCNT-grafted silica nanohybrids as reinforcements. MWCNT-grafted silica nanohybrids were synthesized by the generation of silica nanoparticles on the MWCNT surface through the sol-gel technique. This synthetic method involves organo-modified MWCNTs that are dispersed in tetrahydrofuran, which incorporates tetraethoxysilane that undergoes an ultrasonic sol-gel process. Gelation yielded highly dispersed silica on the organo-modified MWCNTs. The structure and properties of the nanohybrids were established using 29Si nuclear magnetic resonance, Raman spectroscopy, wide-angle X-ray diffraction, thermogravimetric analysis, and transmission electron microscopy. The resulting MWCNT nanoarchitectures were covalently assembled into silica nanoparticles, which exhibited specific and controllable morphologies and were used to reinforce biodegradable PLA. The tensile strength and the heat deflection temperature (HDT of the PLA/MWCNT-grafted silica nanocomposites increased when the MWCNT-grafted silica was applied to the PLA matrix; by contrast, the surface resistivity of the PLA/MWCNT-grafted silica nanocomposites appeared to decline as the amount of MWCNT-grafted silica in the PLA matrix increased. Overall, the reinforcement of PLA using MWCNT-grafted silica nanoarchitectures was efficient and improved its mechanical properties, heat resistance, and electrical resistivity.

  20. Hydrophobic surface functionalization of lignocellulosic jute fabrics by enzymatic grafting of octadecylamine.

    Science.gov (United States)

    Dong, Aixue; Fan, Xuerong; Wang, Qiang; Yu, Yuanyuan; Cavaco-Paulo, Artur

    2015-08-01

    Enzymatic grafting of synthetic molecules onto lignins provides a mild and eco-friendly alternative for the functionalization of lignocellulosic materials. In this study, laccase-mediated grafting of octadecylamine (OA) onto lignin-rich jute fabrics was investigated for enhancing the surface hydrophobicity. First, the lignins in jute fabrics were isolated and analyzed in the macromolecular level by MALDI-TOF MS, (1)H NMR, (13)C NMR, and HSQC-NMR. Then, the surface of jute fabrics was characterized by FT-IR, XPS, and SEM. Subsequently, the nitrogen content of jute fabrics was determined by the micro-Kjeldahl method, and the grafting percentage (Gp) and grafting efficiency (GE) of the enzymatic reaction were calculated. Finally, the surface hydrophobicity of the jute fabrics was estimated by contact angle and wetting time measurements. The results indicate that the OA monomers were successfully grafted onto the lignin moieties on the jute fiber surface by laccase with Gp and GE values of 0.712% and 10.571%, respectively. Moreover, the modified jute fabrics via OA-grafting showed an increased wetting time of 18.5 min and a contact angle of 116.72°, indicating that the surface hydrophobicity of the jute fabrics increased after the enzymatic grafting modification with hydrophobic OA molecules. Copyright © 2015 Elsevier B.V. All rights reserved.

  1. Saphenous vein graft vs. radial artery graft searching for the best second coronary artery bypass graft

    Science.gov (United States)

    Al-Sabti, Hilal Ali; Al Kindi, Adil; Al-Rasadi, Khalid; Banerjee, Yajnavalka; Al-Hashmi, Khamis; Al-Hinai, Ali

    2013-01-01

    Coronary artery bypass grafting (CABG) was first used in the late 1960s. This revolutionary procedure created hope among ischemic heart disease patients. Multiple conduits are used and the golden standard is the left internal mammary artery to the left anterior descending artery. Although all approaches were advocated by doctors, the use of saphenous vein grafts became the leading approach used by the majority of cardiac surgeons in the 1970s. The radial artery graft was introduced at the same time but was not as prevalent due to complications. It was reintroduced into clinical practice in 1989. The procedure was not well received initially but it has since shown superiority in patency as well as long-term survival after CABG. This review provides a summary of characteristics, technical features and patency rates of the radial artery graft in comparison with venous conduits. Current studies and research into radial artery grafts and saphenous vein grafts for CABG are explored. However, more studies are required to verify the various findings of the positive effects of coronary artery bypass grafting with the help of radial arteries on mortality and long-lasting patency. PMID:24198449

  2. [Skin defect coverage with micro skin graft].

    Science.gov (United States)

    Gümüş, Nazim; Kaya, Yalçin; Karakaya, Sadik; Camci, Cemalettin

    2002-04-01

    The aim of this study is to coverage of the large skin defect with microskin graft. The wound coverage of the large skin defect may be difficult with auto skin graft. In these patients, split thickness skin graft may be used in a bloc shape or expanded skin graft shape and a stamp skin graft shape or expanded stamp skin graft shape. On the other hand, split thickness skin graft may be used as a micrograft shape after the mincing process, which reduces of the graft size in a few millimeters. In this study, 6 patients with skin defect was admitted in our clinic, and their skin defect was treated with micro skin graft. Expansion ratio was 1:15. Epithelialization on the wound surface was completed in 4 to 6 weeks and cobblestone appearance was observed after the wound coverage. Skin defect coverage with micrograft is an effective technique like the other skin graft coverage methods.

  3. Renal insufficiency and hemodialysis after radiotherapy of carcinoma colli

    International Nuclear Information System (INIS)

    Yoshioka, Tamotsu; Koike, Hidechika; Arima, Toshihisa; Fuchimoto, Sadayoshi

    1975-01-01

    Hemodialysis was performed in 2 cases of acute renal insufficiency after radiotherapy of carcinoma colli (Stage III of carcinoma colli). This experience was reported including discussion. One patient developed ileus and uremia approximately 6 months after radiotherapy (telecobalt 6000 R and radium 1800 mgh). The other complained of anuria and low fever approximately 3 years after radiotherapy (telecobalt 6000 R and radium 3800 mgh), which led to the presumption of post-renal urinary retention due to complete obstruction of the ureter. Both patients escaped from crisis by hemodialysis. (Kanao, N.)

  4. A case of scrub typhus requiring maintenance hemodialysis

    Directory of Open Access Journals (Sweden)

    Dae-Yeon Kim

    2013-12-01

    Full Text Available Renal failure caused by scrub typhus is known to be reversible. In most cases, renal function is almost fully restored after appropriate antibiotic treatment. A 71-year-old man was diagnosed with scrub typhus complicated by renal failure. A renal biopsy revealed histopathologic findings consistent with acute tubulointerstitial nephritis. Renal function did not improve 18 months after discharge and the patient required continuous hemodialysis. Although severe renal failure requiring dialysis is a rare complication of scrub typhus, we describe a case of scrub typhus requiring maintenance hemodialysis. To the best of our knowledge, this is the first such report.

  5. Large-Eddy Simulation of Flows Through a Novel Vascular Access Device for Hemodialysis Access

    Science.gov (United States)

    Obabko, Aleksandr; Tsyrulnykov, Eduard; Rainsberger, Robert; Torreira, Alvaro V.; Nagib, Hassan; Agarwal, Anil; Fischer, Paul F.

    2017-11-01

    The preferred vascular access in patients on hemodialysis (HD) is an arteriovenous (AV) fistula or graft. The majority of the HD patients in the US are dialyzed with an AV fistula where two needles are used for cannulation in most cases. However, this approach can be painfully invasive, extremely difficult to gain access in patients with challenging geometry of vascular access, and is often inadequate to provide optimal blood flow. This work attempts to address the shortcomings of the above procedure and introduces a novel cannulation device that allows less painful easy single access to difficult vessel geometries, and have a potential of improvement of overall increase in efficacy of HD and enhanced patient experience. We present the preliminary Nek5000 large-eddy simulations results of the flows through the device that employs a single 18-gauge needle for cannulation and is able to provide blood flow rates up to 600 ml/min. The range of flow rates and Reynolds numbers up to Re=2,600 are considered and blood recirculation rates are computed. This research used resources of the Argonne Leadership Computing Facility and was supported in part by the U.S. DOE Office of Science under Contract DE-AC02-06CH11357.

  6. Synthetic Biological Membrane (SBM)

    Data.gov (United States)

    National Aeronautics and Space Administration — The ultimate goal of the Synthetic Biological Membrane project is to develop a new type of membrane that will enable the wastewater treatment system required on...

  7. Analysis of 855 upper extremity fistulas created using a standard protocol: the role of graft extension to achieve functional status.

    Science.gov (United States)

    Allan, Bassan J; Perez, Enrique R; Tabbara, Marwan

    2013-06-01

    The Fistula First Breakthrough Initiative (FFBI) has been one of the most important national programs to help achieve considerable improvements in the care of patients on chronic hemodialysis. FFBI has helped place guidelines to push practitioners to reduce the use of tunneled central venous catheters and to increase the rate of arteriovenous fistula use in patients requiring chronic hemodialysis access. However, despite current guidelines, no specific protocols exist for the creation and management of autogenous arteriovenous fistulas and outcomes at most centers are below national benchmarks. In this study, we examine the effectiveness of a standard protocol used at our institution for the creation of autogenous upper extremity fistulas for hemodialysis access in achieving early cannulation and early removal of tunneled dialysis catheters. Our review encompasses 855 consecutive autogenous fistulas created over a 10-year period. Our findings suggest that the use of a standard protocol for creation and management of autogenous fistulas can help increase the rate of functional accesses over national benchmarks. Additionally, extension/conversion of malfunctioning fistulas to grafts appears to be an excellent method to expedite removal of a tunneled dialysis catheter with concomitant preservation of a fistula.

  8. Synthesis and characterization of polypyrrole grafted chitin

    Science.gov (United States)

    Ramaprasad, A. T.; Latha, D.; Rao, Vijayalakshmi

    2017-05-01

    Synthesis and characterization of chitin grafted with polypyrrole (PPy) is reported in this paper. Chitin is soaked in pyrrole solution of various concentrations for different time intervals and polymerized using ammonium peroxy disulphate (APS) as an initiator. Grafting percentage of polypyrrole onto chitin is calculated from weight of chitin before and after grafting. Grafting of polymer is further verified by dissolution studies. The grafted polymer samples are characterized by FTIR, UV-Vis absorption spectrum, XRD, DSC, TGA, AFM, SEM and conductivity studies.

  9. Hybridization with synthetic oligonucleotides

    Energy Technology Data Exchange (ETDEWEB)

    Szostak, J.W.; Stiles, J.I.; Tye, B.K.; Sherman, F.; Wu, R.

    1978-01-01

    Procedures are described for the use of synthetic oligonucleotides for Southern blot experiments and gene bank screening, and the effect of various mismatches on the efficiency of hybridization is demonstrated. The following topics are discussed: sensitivity vs. specificity, hybridization of a 12-mer to the lambda endolysin gene; hybridization of oligonucleotide probes to the E. coli lac operator; hybridization of synthetic probes to the CYC1 gene of yeast; and cloning eucaryotic genes. (HLW)

  10. Mammalian Synthetic Biology

    OpenAIRE

    Martella, Andrea; Pollard, Steven M; Dai, Junbiao; Cai, Yizhi

    2016-01-01

    The enabling technologies of synthetic biology are opening up new opportunities for engineering and enhancement of mammalian cells. This will stimulate diverse applications in many life science sectors such as regenerative medicine, development of biosensing cell lines, therapeutic protein production, and generation of new synthetic genetic regulatory circuits. Harnessing the full potential of these new engineering-based approaches requires the design and assembly of large DNA constructs-pote...

  11. [Incremental approach to hemodialysis: twice a week, or once weekly hemodialysis combined with low-protein low-phosphorus diet?].

    Science.gov (United States)

    Bolasco, Piergiorgio; Caria, Stefania; Egidi, Maria Francesca; Cupisti, Adamasco

    2015-01-01

    The start of dialysis treatment is a critical step in the care management of chronic renal failure patients. When hemodialysis is performed three times a week, rapid loss of kidney function and of urine volume output generally occur and this represents an unfavorable prognostic factor. Instead, reducing frequency of hemodialysis sessions, as well as peritoneal dialysis, can contribute to a lesser decrease of residual renal function. Unfortunately, the existing protocols for an incremental hemodialysis approach are not particularly common and they are generally limited to a twice a week hemodialysis schedule. In addition to clinical and economic reasons, an incremental approach to ESRD also contributes to better social and psychological adaptation by the patients to the dramatic change in living conditions linked to the maintenance dialysis treatment. In patients who have attitude for low-protein nutritional therapy, a once weekly dialysis schedule combined with low-protein, low-phosphorus, normal to high energy diet in the remaining six days of the week can be implemented in selected patients. In our experience, this kind of program produced important clinical results and reduction in costs and hospitalization. When compared with a three times a week dialysis schedule, a greater protection of residual renal function and of urine volume output, lower increase in 2 microglobulin, better control of phosphorus and less consumption of phosphate binders and erythropoietin were observed. Careful clinical monitoring and nutrition is essential for the safety and optimization of infrequent hemodialysis. Long-term follow-up analysis shows favorable effects on the overall survival. Furthermore, twice a week hemodialysis is not the only option for an incremental approach of dialysis commencing. In patients who have a good attitude for low-protein nutritional therapy, its arrangement with a program of once weekly dialysis represents a real and effective alternative.

  12. Bone Grafting: Sourcing, Timing, Strategies, and Alternatives.

    Science.gov (United States)

    Egol, Kenneth A; Nauth, Aaron; Lee, Mark; Pape, Hans-Christoph; Watson, J Tracy; Borrelli, Joseph

    2015-12-01

    Acute fractures, nonunions, and nonunions with bone defects or osteomyelitis often need bone graft to facilitate union. There are several factors to consider when it is determined that a bone graft is needed. These factors include the source of the bone graft (autograft vs. allograft), proper timing for placement of the bone graft, strategies to avoid further complications (particularly in the setting of osteomyelitis), and with the development of a variety of bone graft substitutes, whether alternatives to autograft are available and appropriate for the task at hand. Autograft bone has commonly been referred to as the "gold standard" of bone grafts, against which the efficacy of other grafts has been measured. The best timing for when to place a bone graft or substitute is also somewhat controversial, particularly after an open fracture or a potentially contaminated bed. The treatment of infected nonunions, particularly those that require a graft to facilitate healing, can be quite challenging. Typically, the infection is completely eradicated before placement of a bone graft, but achieving a sterile bed and the timing of a bone graft require strategic thinking and planning. This review outlines the benefits of autografts, the most suitable sites for harvesting bone grafts, the timing of bone graft procedures, the potential risks and benefits of grafting in the face of infection, and the currently available bone graft extenders.

  13. Air Pump-Assisted Graft Centration, Graft Edge Unfolding, and Graft Uncreasing in Young Donor Graft Pre-Descemet Endothelial Keratoplasty.

    Science.gov (United States)

    Jacob, Soosan; Narasimhan, Smita; Agarwal, Amar; Agarwal, Athiya; A I, Saijimol

    2017-08-01

    To assess an air pump-assisted technique for graft centration, graft edge unfolding, and graft uncreasing while performing pre-Descemet endothelial keratoplasty (PDEK) using young donor grafts. Continuous pressurized air infusion was used for graft centration, graft edge unfolding, and graft unwrinkling. Ten eyes of 10 patients underwent PDEK with donors aged below 40 years. In all eyes, the donor scrolled into tight scrolls. In all cases, the air pump-assisted technique was effective in positioning and centering the graft accurately and in straightening infolded graft edges and smoothing out graft creases and wrinkles. Endothelial cell loss was 38.6%. Postoperative best-corrected visual acuity at 6 months was 0.66 ± 0.25 in decimal equivalent. Continuous pressurized air infusion acted as a third hand providing a continuous pressure head that supported the graft and prevented graft dislocation as well as anterior chamber collapse during intraocular maneuvering. Adequate maneuvering space was available in all cases, and bleeding, if any, was tamponaded successfully in all cases. Although very young donor grafts may be used for PDEK, they are difficult to center and unroll completely before floating against host stroma. An air pump-assisted technique using continuous pressurized air infusion allows successful final graft positioning even with very young donor corneas. It thus makes surgery easier as several key steps are made easier to handle. It additionally helps in tamponading hemorrhage during peripheral iridectomy, increasing surgical space, preventing fluctuations in the anterior chamber depth, and promoting graft adherence.

  14. Costal Grafting in Mandibular Reconstruction.

    Science.gov (United States)

    Bachelet, Jean-Thomas; Bourlet, Jerôme; Château, Joseph; Jacquemart, Mathieu; Dufour, Clémence; Mojallal, Ali; Gleizal, Arnaud

    2015-11-01

    Reconstruction of mandibular bone defect is a common indication in craniomaxillofacial surgery, and free fibular flap is the gold standard for this indication. However, there are alternatives; nonvascular bone grafting is one of them, and we present the costal grafting for mandibular reconstruction, a classic technique that is reliable, efficient, and produced less morbidity than the technique of using composite free flaps. A 9-year retrospective review of 54 patients treated surgically for mandibular reconstruction was performed. The criterion mainly analyzed was graft survival. The surgical technique was described in detail. A total of 54 patients with mandibular bone defect were identified. Five symphysis, 46 corpus, and 20 ramus defects were considered. These patients underwent reconstruction by costal grafting, and the engrafting was successful in 92.6% of cases. Dental rehabilitation with dental implants was realized in 70% of cases. The approach described in this article allowed the authors to obtain good results with costal grafting for mandibular reconstruction and dental rehabilitation. Costal grafting is a good alternative for fibula free flap in specific indications. Reconstruction of mandibular bone defect is a common indication in craniomaxillofacial surgery. Since the 1980s, the gold standard for these defects is the use of free fibular flap.(1) In some cases, this technique is contradicted; the surgeon then has several possibilities for the use of free osteomyocutaneous flaps (iliac crest, scapula, and serrato-costal flaps).(2-8).

  15. Primary graft dysfunction.

    Science.gov (United States)

    Suzuki, Yoshikazu; Cantu, Edward; Christie, Jason D

    2013-06-01

    Primary graft dysfunction (PGD) is a syndrome encompassing a spectrum of mild to severe lung injury that occurs within the first 72 hours after lung transplantation. PGD is characterized by pulmonary edema with diffuse alveolar damage that manifests clinically as progressive hypoxemia with radiographic pulmonary infiltrates. In recent years, new knowledge has been generated on risks and mechanisms of PGD. Following ischemia and reperfusion, inflammatory and immunological injury-repair responses appear to be key controlling mechanisms. In addition, PGD has a significant impact on short- and long-term outcomes; therefore, the choice of donor organ is impacted by this potential adverse consequence. Improved methods of reducing PGD risk and efforts to safely expand the pool are being developed. Ex vivo lung perfusion is a strategy that may improve risk assessment and become a promising platform to implement treatment interventions to prevent PGD. This review details recent updates in the epidemiology, pathophysiology, molecular and genetic biomarkers, and state-of-the-art technical developments affecting PGD. Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.

  16. Alveolar ridge sockets preservation with bone grafting--review.

    Science.gov (United States)

    Allegrini, Sergio; Koening, Bruno; Allegrini, Marcia Rivellino Facci; Yoshimoto, Marcelo; Gedrange, Tomasz; Fanghaenel, Jochen; Lipski, Mariusz

    2008-01-01

    Alveolar bone seems to play a key role in providing support to the teeth, which are anchored to the bone by desmodontal fibers. The progressive alveolar bone resorption process occurs due to a loss of anatomic, biologic and mechanical factors. Mechanical stimulation of alveolar bone during mastication is crucial in keeping the teeth and underlying bone healthy. Tooth extraction leads to typical bone deficiency of ridge width and height of alveolar crest and reduces the possibility of placing screw titanium implants. When tooth extraction is necessary, trauma should be minimized during the procedure and bone preservation should receive careful attention. The literature has shown that early bone loss can be significantly reduced by socket grafting. The process of socket grafting requires an understanding of wound healing and an appreciation of the biological properties of the products available for socket grafting. Augmentative measures may, thus, be required to guarantee optimal prosthetic replacement of the lost tissue. Success or failure of augmentation procedures is dependent on revascularization and remodelling of the grafted bone into a vital, load bearing bone. In contrast to a visible three-dimensional change, the concept of remodelling refers to the internal turnover of bone, which is a coupled process where osteoclastic resorption and osteoblastic formation are more or less balanced. To restore alveolar bone loss and support efficient placement of dental implants, many different bone substitute such as autografts, allografts, xenografts, synthetic biomaterials and osteoactive agents have been proposed. In order to avoid harvesting an autograft, and thereby eliminating additional surgical procedures and risks, bone grafting materials and substitutes are alternative filler materials to be used for ridge augmentation. To present a literature review about biomaterials applicable in alveolar ridge sockets preservation to future implants insertion. The

  17. Prognostic value of bone- and vascular-derived molecular biomarkers in hemodialysis and renal transplant patients: a systematic review and meta-analysis.

    Science.gov (United States)

    Pichler, Gernot; Haller, Maria C; Kainz, Alexander; Wolf, Myles; Redon, Josep; Oberbauer, Rainer

    2017-09-01

    Patients undergoing hemodialysis and kidney graft recipients are high-risk populations for cardiovascular and all-cause mortality. Fibroblast growth factor 23 (FGF23), osteoprotegerin (OPG), RANK ligand, osteopontin (OPN), Klotho protein and bone morphogenetic protein-7 (BMP-7) are bone- and vascular-derived molecular biomarkers that have been shown to be associated with cardiovascular surrogate end points; however, currently available data on the prognostic value of these biomarkers is inconsistent. The aim of the present study was to conduct a systematic review and meta-analysis in order to summarize the available evidence on the association of molecular biomarkers with mortality in individuals undergoing hemodialysis and renal transplant patients. Two databases (MEDLINE and Embase) were systematically searched. Studies were eligible if the association of biomarker and mortality was reported as time-to-event data [hazard Ratio (HR)] or as effect size with a fixed time of follow-up [odds Ratio (OR)]. Abstracted HRs were converted onto a standard scale of effect and combined using a random effects model. From a total of 1170 studies identified in initial searches, 21 met the inclusion criteria. In hemodialysis patients, comparing the lower third with the upper third of baseline FGF23 distribution, pooled HRs (95% confidence intervals) were 1.94 (1.47, 2.56) for all-cause mortality and 2.4 (1.64, 3.51) for cardiovascular mortality. For the same comparison of baseline OPG distribution, pooled HRs were 1.8 (0.95, 3.39) for all-cause mortality and 2.53 (1.29, 4.94) for cardiovascular mortality. Reported risk estimates of RANK ligand, OPN, Klotho protein and BMP-7 were not suitable for pooling; however, only Klotho protein was significantly related to mortality. For kidney graft recipients, four studies that investigated the relationship of FGF23 and OPG with mortality were identified, all of which reported a significant association. In hemodialysis patients, FGF23 is a

  18. Food intake in patients on hemodialysis

    Directory of Open Access Journals (Sweden)

    Inaiana Marques Filizola Vaz

    2014-12-01

    Full Text Available Objective: To evaluate the intake of energy and nutrients by individuals on hemodialysis, following especific recommendations for this population and according to Food Guide for the Brazilian Population. Methods: A cross-sectional study, 118 adult patients, considered stable from, ten dialysis centers in Goiânia, Goiás. Dietary intake was estimated by six 24-hour recalls, and classified as adequate or inadequate, according to specific recommendations for individuals undergoing dialysis and that recommended for a healthy diet. A descriptive analysis was performed. Results: Average dietary intake of 2022.40 ± 283.70 kcal/day; 31.18 kcal/kg/day; 55.03 ± 4.20% carbohydrate; 30.23 ± 3.71% lipid, 1.18 ± 0.23 g protein/kg/day. Important prevalences of inadequacy were observed for the intake of calories (39.0%, protein (39.0% and other nutrients such as retinol (94.9%, saturated fat (87.3%, cholesterol (61,9%, iron (61.0%, potassium (60.2% and zinc (45.0%. Patients had a low intake of fruit food group (1.22 ± 0.89 servings and vegetables (1.76 ± 1.01 servings, dairy products (0.57 ± 0.43 servings and high intake of food group of oils and fats (3.45 ± 0.95 servings, sugars and sweets (1.55 ± 0.77 servings. Conclusion: Observed food consumption imbalance, characterized by excess of oils and fats, especially saturated oils and cholesterol, sugars and sweets, parallel to low intake of fruits and vegetables and dairy products. A considerable percentage of patients did not intake the minimum recommended of calories, protein, retinol, iron, zinc and potassium.

  19. Classification of bone scintigrams in hemodialysis patients

    International Nuclear Information System (INIS)

    Ishibashi, Kazunari; Miyamae, Tatsuya

    1985-01-01

    Bone scintigrams from a total of 75 hemodialysis patients using sup(99m)Tc-methylene-diphosphonate (MDP) were classified into two groups; Group I (56 patients) in which the uptake of the radioactivity appeared to be relatively high in the soft tissue and low in the bone, and Group II (19 patients) in which high uptake in the bone and low uptake in the soft tissue were observed. Patients in Group I were further classified into two subgroups; Group I sub(A) (articular type, 21 patients) which was characterized by relatively high uptake into the joint, and Group I sub(B) (reduction type, 35 patients) where uptake was faint in the whole region of the bone. The classification of patients in Group II was also performed; Group II sub(A) (spinal type, 14 patients) where high spinal uptake was observed, and Group II sub(B) (cranio-facial type, 5 patients) where high uptake into the cranio-facial region was observed. The results were compared with 146 subjects with normal bone scintigram in terms of the ratio of bone to soft tissue uptake (B/S ratio) for the cranial bone, jaw bone, lumbar vertebra and femoral bone, and the ratio of epiphysis to diaphysis uptake (E/D ratio) for the femoral bone. The B/S ratio was low in Group I and high in Group II for the bone studied, and the E/D ratio was markedly high in Group I sub(A). Histobiochemical examination indicated that patients in Group I sub(A) and Group II may have osteomalacia and secondary hyperparathyroidism, respectively. It was considered that the visual classification and semiquantitative study as described here were useful for evaluating the pathological condition of renal osteodystrophy. (author)

  20. Perceived illness intrusion among patients on hemodialysis

    International Nuclear Information System (INIS)

    Bapat, Usha; Kedlaya, Prashanth G; Gokulnath

    2009-01-01

    Dialysis therapy is extremely stressful as it interferes with all spheres of daily activities of the patients. This study is aimed at understanding the perceived illness intrusion among patients on hemodialysis (HD) and to find the association between illness intrusion and patient demo-graphics as well as duration of dialysis. A cross sectional study involving 90 patients with chronic kidney disease (CKD) stage V, on HD was performed during the period from 2005 to 2006. The subjects included were above 18 years of age, willing, stable and on dialysis for at least two months. Patients with psychiatric co-morbidity were excluded. A semi-structured interview schedule covering sociodemographics and a 13 item illness intrusion checklist covering the various aspects of life was carried out. The study patients were asked to rate the illness intrusion and the extent. The data were analyzed statistically. The mean age of the subjects was 50.28 + - 13.69 years, males were predominant (85%), 73% were married, 50% belonged to Hindu religion, 25% had pre-degree education, 25% were employed and 22% were housewives. About 40% and 38% of the study patients belonged to middle and upper socio-economic strata respectively; 86% had urban background and lived in nuclear families. The mean duration on dialysis was 24 + - 29.6 months. All the subjects reported illness intrusion to a lesser or greater extent in various areas including: health (44%), work (70%) finance (55%), diet (50%) sexual life (38%) and psychological status (25%). Illness had not intruded in areas of relationship with spouse (67%), friends (76%), family (79%), social (40%) and religious functions (72%). Statistically significant association was noted between illness intrusion and occupation (P= 0.02). (author)

  1. Perceived illness intrusion among patients on hemodialysis

    Directory of Open Access Journals (Sweden)

    Bapat Usha

    2009-01-01

    Full Text Available Dialysis therapy is extremely stressful as it interferes with all spheres of daily acti-vities of the patients. This study is aimed at understanding the perceived illness intrusion among pa-tients on hemodialysis (HD and to find the association between illness intrusion and patient demo-graphics as well as duration of dialysis. A cross sectional study involving 90 patients with chronic kidney disease (CKD stage V, on HD was performed during the period from 2005 to 2006. The subjects included were above 18 years of age, willing, stable and on dialysis for at least two months. Patients with psychiatric co-morbidity were excluded. A semi-structured interview schedule covering socio-demographics and a 13 item illness intrusion checklist covering the various aspects of life was ca-rried out. The study patients were asked to rate the illness intrusion and the extent. The data were ana-lyzed statistically. The mean age of the subjects was 50.28 ± 13.69 years, males were predominant (85%, 73% were married, 50% belonged to Hindu religion, 25% had pre-degree education, 25% were employed and 22% were housewives. About 40% and 38% of the study patients belonged to middle and upper socio-economic strata respectively; 86% had urban background and lived in nuclear fami-lies. The mean duration on dialysis was 24 ± 29.6 months. All the subjects reported illness intrusion to a lesser or greater extent in various areas including: health (44%, work (70% finance (55%, diet (50% sexual life (38% and psychological status (25%. Illness had not intruded in areas of rela-tionship with spouse (67%, friends (76%, family (79%, social (40% and religious functions (72%. Statistically significant association was noted between illness intrusion and occupation (P= 0.02.

  2. Sodium setpoint and gradient in bicarbonate hemodialysis.

    Science.gov (United States)

    Basile, Carlo; Libutti, Pasquale; Lisi, Piero; Vernaglione, Luigi; Casucci, Francesco; Losurdo, Nicola; Teutonico, Annalisa; Lomonte, Carlo

    2013-01-01

    The demonstration of an individual osmolar setpoint in hemodialysis (HD) is crucial to individualize dialysate sodium concentrations. Furthermore, the diffusive gradient between plasma and dialysate sodium is important in the "fine tuning" of the intradialytic sodium mass balance (MB). The design of this study included part A: a retrospective analysis of predialysis plasma sodium concentrations extracted from a 6-year database in our HD population (147 prevalent white anuric patients); and part B: study of intradialytic sodium kinetics in 48 patients undergoing one 4-hour bicarbonate HD session. Direct potentiometry with an ion-selective electrode was used for sodium measurements. Study part A: the mean number of plasma sodium measurements per patient was 16.06 ± 14.03 over a mean follow-up of 3.55 ± 1.76 years. The mean of the averaged plasma sodium concentrations was 136.7 ± 2.1 mmol/L, with a low mean intraindividual coefficient of variation (1.39 ± 0.4). Study part B: mean predialysis and postdialysis plasma sodium concentrations were 135.8 ± 0.9 and 138.0 ± 0.9 mmol/L (p<0.001). Mean inlet dialyzer sodium concentration was 138.7 ± 1.1 mmol/L; the hourly diffusion concentration gradients showed a statistically significant transfer from dialysate to plasma (Wilks ? <0.0001). A statistically significant relationship was found between sodium MB and diffusion gradient (p<0.02), and between sodium MB and ultrafiltration volume (p<0.01). A relatively "fixed" and individual osmolar setpoint in HD patients was shown for the first time in a long-term follow-up. A dialysate sodium concentration of 140 mmol/L determined a dialysate to plasma sodium gradient.

  3. Acute hemodialysis effects on doppler echocardiographic indices

    Directory of Open Access Journals (Sweden)

    Leila Abid

    2014-01-01

    Full Text Available Conventional echocardiographic (ECHO parameters of systolic and diastolic func-tion of the left ventricular (LV have been shown to be load dependent. However, the impact of pre-load reduction on tissue Doppler (TD parameters of LV function is incompletely understood. To evaluate the effect of a single hemodialysis (HD session on LV systolic and diastolic function using pulsed Doppler echocardiography and pulsed tissue Doppler imaging (TDI, we studied 81chronic HD patients (40 males; mean age 52.4 ± 16.4 years with these tools. ECHO parameters were obtained 30 min before and 30 min after HD. Fluid volume removed by HD was 1640 ± 730 cm [3] . HD led to reduction in LV end-diastolic volume (P <0.001, end-systolic volume (P <0.001, left atrium area (P <0.001, peak early (E-wave trans-mitral flow velocity (P <0.001, the ratio of early to late Doppler velocities of diastolic mitral inflow (P <0.001 and aortic time velocity integral (P <0.001. No significant change in peak S velocity of pulmonary vein flow after HD was noted. Early and late diastolic (E′ TDI velocities and the ratio of early to late TDI diastolic velocities (E′/A′ on the lateral side of the mitral annulus decreased signi-ficantly after HD (P = 0.013; P = 0.007 and P = 0.008, respectively. Velocity of flow progres-sion (Vp during diastole was not affected by pre-load reduction. Pulmonary artery systolic pressure and the diameter of the inferior vena cava decreased significantly (P <0.001 and P <0.001, respectively after HD. We conclude that most of the Doppler-derived indices of diastolic function are pre-load-dependent and velocity of flow progression was minimally affected by pre-load reduction in HD patients.

  4. Restless legs syndrome in patients on hemodialysis

    Directory of Open Access Journals (Sweden)

    Saleh Mohammad Yaser Salman

    2011-01-01

    Full Text Available Restless legs syndrome (RLS is common among dialysis patients, with a reported prevalence of 6-60%. The prevalence of RLS in Syrian patients on hemodialysis (HD is not known. The purpose of this study is to determine the prevalence of RLS in patients on regular HD, and to find the possible correlation between the presence of RLS and demographic, clinical, and biochemical factors. One hundred and twenty-three patients (male/female = 70/53, mean age = 41.95 ± 15.11 years on HD therapy at the Aleppo University Hospital were enrolled into the study. RLS was diagnosed based on criteria established by the International Restless Legs Syn-drome Study Group (IRLSSG. Data procured were compared between patients with and without RLS. Applying the IRLSSG criteria for the diagnosis, RLS was seen in 20.3% of the study pa-tients. No significant difference in age, gender, and intake of nicotine and caffeine was found between patients with and without the RLS. Similarly, there was no difference between the two groups in the duration of end-stage renal disease (ESRD, the period of dialysis dependence, dialysis adequacy, urea and creatinine levels, and the presence of anemia. The co-morbidities and the use of drugs also did not differ in the two groups. Our study suggests that the high prevalence of RLS among patients on HD requires careful attention and correct diagnosis can lead to better therapy and better quality of life. The pathogenesis of RLS is not clear and further studies are required to identify any possible cause as well as to discover the impact of this syndrome on sleep, quality of life, and possibly other complications such as cardiovasculare disease.

  5. Radiation grafting on natural films

    International Nuclear Information System (INIS)

    Lacroix, M.; Khan, R.; Senna, M.; Sharmin, N.; Salmieri, S.; Safrany, A.

    2014-01-01

    Different methods of polymer grafting using gamma irradiation are reported in the present study for the preparation of newly functionalized biodegradable films, and some important properties related to their mechanical and barrier properties are described. Biodegradable films composed of zein and poly(vinyl alcohol) (PVA) were gamma-irradiated in presence of different ratios of acrylic acid (AAc) monomer for compatibilization purpose. Resulting grafted films (zein/PVA-g-AAc) had their puncture strength (PS=37–40 N mm −1 ) and puncture deformation (PD=6.5–9.8 mm) improved for 30% and 50% PVA in blend, with 5% AAc under 20 kGy. Methylcellulose (MC)-based films were irradiated in the presence of 2-hydroxyethyl methacrylate (HEMA) or silane, in order to determine the effect of monomer grafting on the mechanical properties of films. It was found that grafted films (MC-g-HEMA and MC-g-silane) using 35% monomer performed higher mechanical properties with PS values of 282–296 N mm −1 and PD of 5.0–5.5 mm under 10 kGy. Compatibilized polycaprolactone (PCL)/chitosan composites were developed via grafting silane in chitosan films. Resulting trilayer grafted composite film (PCL/chitosan-g-silane/PCL) presented superior tensile strength (TS=22 MPa) via possible improvement of interfacial adhesion (PCL/chitosan) when using 25% silane under 10 kGy. Finally, MC-based films containing crystalline nanocellulose (CNC) as a filling agent were prepared and irradiated in presence of trimethylolpropane trimethacrylate (TMPTMA) as a grafted plasticizer. Grafted films (MC-g-TMPTMA) presented superior mechanical properties with a TS of 47.9 MPa and a tensile modulus (TM) of 1792 MPa, possibly due to high yield formation of radicals to promote TMPTMA grafting during irradiation. The addition of CNC led to an additional improvement of the barrier properties, with a significant 25% reduction of water vapor permeability (WVP) of grafted films. - Highlights: • Irradiation of zein

  6. Clusterin in kidney transplantation: novel biomarkers versus serum creatinine for early prediction of delayed graft function.

    Science.gov (United States)

    Pianta, Timothy J; Peake, Philip W; Pickering, John W; Kelleher, Michaela; Buckley, Nicholas A; Endre, Zoltan H

    2015-01-01

    Current methods for rapid detection of delayed graft function (DGF) after kidney transplantation are unreliable. Urinary clusterin is a biomarker of kidney injury but its utility for prediction of graft dysfunction is unknown. In a single-center, prospective cohort study of renal transplant recipients (N=81), urinary clusterin was measured serially between 4 hr and 7 days after transplantation. The utility of clusterin for prediction of DGF (hemodialysis within 7 days of transplantation) was compared with urinary interleukin (IL)-18, neutrophil gelatinase-associated lipocalin (NGAL), kidney injury molecule-1, serum creatinine, and clinical variables. At 4 hr after reperfusion, anuria was highly specific, but of low sensitivity for detection of DGF. At 4 hr, receiver operating characteristic analysis suggested that urinary clusterin, IL-18, kidney injury molecule-1, and NGAL concentration were predictive of DGF. After adjusting for preoperative clinical variables and anuria, clusterin and IL-18 independently enhanced the clinical model for prediction of DGF. Kidney injury molecule-1 only modestly improved the prediction of DGF, whereas NGAL, serum creatinine, and the creatinine reduction ratio did not improve on the clinical model. At 12 hr, the creatinine reduction ratio independently predicted DGF. Both urinary clusterin and IL-18 are useful biomarkers and may allow triaging of patients with DGF within 4 hr of transplantation. Relative performance of biomarkers for prediction of graft function is time-dependant. Early and frequent measurements of serum creatinine and calculation of the creatinine reduction ratio also predict DGF within 12 hr of reperfusion.

  7. Bioimpedance spectroscopy method to determine hypervolemia in maintenance hemodialysis patients

    OpenAIRE

    Merhametsiz, O; Oguz, EG; Yayar, O; Bektan, B; Canbakan, B; Ayli, D

    2015-01-01

    Background: Hypervolemia is a major risk factor for hypertension leading to cardiovascular diseases and also a frequent problem in maintenance hemodialysis (MHD) patients. Fluid overload (FO) can be determined by bioimpedance spectroscopy (BIS) which is a new, practical, and non-invasive method. We tried to determine FO by BIS in MHD patients and find out the relationship between FO and clinical features.

  8. Effect of hemodialysis on total antioxidant status of chronic renal ...

    African Journals Online (AJOL)

    Background: Renal failure is accompanied by oxidative stress, which is caused by enhanced production of reactive oxygen species and impaired antioxidant defense. Aim: To assess the effect of hemodialysis (by cellulose membrane dialyzer) on plasma total antioxidant status and lipid peroxidation of patients in chronic ...

  9. Estimated glomerular filtration rate at initiation of hemodialysis in a ...

    African Journals Online (AJOL)

    Background: Renal replacement therapy is indicated for patients with end-stage renal disease (ESRD). The glomerular filtration rate (GFR) of ESRD patients at initiation of hemodialysis vary depending on several factors including comorbidities, physicians' practice and geographical region amongst others. Aim: We ...

  10. Critical Evaluation of Blood Volume Measurements during Hemodialysis

    NARCIS (Netherlands)

    Dasselaar, Judith J.; van der Sande, Frank M.; Franssen, Casper F. M.

    2012-01-01

    Devices that continuously measure relative blood volume (RBV) changes during hemodialysis (HD) are increasingly used for the prevention of dialysis hypotension and fine-tuning of dry weight. However, RBV measurements are subject to various limitations. First, RBV devices provide information on

  11. Chronic pain in hemodialysis patients: Role of bone mineral ...

    African Journals Online (AJOL)

    ... lower calcium, lower 25(OH) D3 levels, higher parathyroid hormone (PTH) levels and experienced chronic pain (p< 0.001). Conclusion: Chronic pain is highly experienced in long-term hemodialysis patients. Malnutrition, high CRP and disturbed bone mineral metabolism are highly correlated with the incident of this pain.

  12. 21 CFR 876.5665 - Water purification system for hemodialysis.

    Science.gov (United States)

    2010-04-01

    ... dialysate. This generic type of device may include a water softener, sediment filter, carbon filter, and... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Water purification system for hemodialysis. 876... SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5665 Water...

  13. Vascular access complications and risk factors in hemodialysis ...

    African Journals Online (AJOL)

    Vascular access complications and risk factors in hemodialysis patients: A single center study. ... Stenosis was the most common risk factor for vascular failure as it occurred in (29%) of patients. ... Other risk factors for dialysis CRBSI include older age, low serum albumin, high BUN and decreasing the duration of dialysis.

  14. Sexual dysfunction in women with ESRD requiring hemodialysis

    NARCIS (Netherlands)

    Strippoli, G.F.; Vecchio, M.; Palmer, S.; De Berardis, G.; Craig, J.; Lucisano, G.; Johnson, D.; Pellegrini, F.; Nicolucci, A.; Sciancalepore, M.; Saglimbene, V.; Gargano, L.; Bonifati, C.; Ruospo, M.; Navaneethan, S.D.; Montinaro, V.; Stroumza, P.; Zsom, M.; Torok, M.; Celia, E.; Gelfman, R.; Bednarek-Skublewska, A.; Dulawa, J.; Graziano, G.; Gentile, G.; Ferrari, J.N.; Santoro, A.; Zucchelli, A.; Triolo, G.; Maffei, S.; Hegbrant, J.; Wollheim, C.; De Cosmo, S.; Manfreda, V.M.; Steiner, K.; et al.,

    2012-01-01

    BACKGROUND AND OBJECTIVES: The few existing studies of sexual dysfunction in women on hemodialysis are limited by small sample size. This large, cross-sectional study evaluated the prevalence and correlates of female sexual dysfunction in advanced kidney disease. DESIGN, SETTING, PARTICIPANTS,

  15. Hypercalcemia, inappropriate calcitriol levels, and tuberculosis on hemodialysis.

    Science.gov (United States)

    Peces, R; Pobes, A; Díaz-Corte, C; Gago, E

    2000-08-01

    We describe a female patient undergoing hemodialysis who developed tuberculosis, hypercalcemia, and inappropriately elevated calcitriol levels. These findings suggest ectopic production of calcitriol by tuberculous granulomas. Successful treatment of tuberculosis led to a substantial decrease in the levels of calcium and calcitriol.

  16. Left atrial calcification in a hemodialysis patient with cor triatriatum.

    Science.gov (United States)

    Peces, R; Pobes, A; Rodriguez, M; Simarro, C; Iglesias, G; Simarro, E

    2000-05-01

    Myocardial calcification is a rare manifestation of abnormal calcium metabolism seen in some patients with chronic renal failure. This report describes the transesophageal echocardiographic and spiral computed tomography (CT) findings in a young hemodialysis female with severe secondary hyperparathyroidism. These findings included calcification of the multiperforated membrane of a cor triatriatum and the wall of the left atrium.

  17. Implementation and Analysis of Hemodialysis in the Unit Operations Laboratory

    Science.gov (United States)

    Madihally, Sundararajan V.; Lewis, Randy S.

    2007-01-01

    To enhance bioengineering in the chemical engineering curriculum, a Unit Operations experiment simulating the hemodialysis of creatinine was implemented. The blood toxin creatinine was used for developing a more realistic dialysis experiment. A dialysis model is presented that allows students to assess the validity of model assumptions. This work…

  18. Effects of inspiratory muscle training in hemodialysis patients.

    Science.gov (United States)

    Silva, Vanessa Giendruczak da; Amaral, Carolina; Monteiro, Mariane Borba; Nascimento, Daniela Meirelles do; Boschetti, Jaqueline Regina

    2011-03-01

    Chronic kidney disease associated with hemodialysis can have a variety of musculoskeletal complications, in addition to repercussions in pulmonary function. To evaluate the effects of inspiratory muscle training on inspiratory muscle strength, pulmonary function, and functional capacity in patients with chronic kidney failure undergoing hemodialysis. Non-controlled clinical trial, comprising 15 individuals diagnosed with chronic kidney failure and undergoing hemodialysis. Maximum inspiratory (PImax) and expiratory (PEmax) pressures were assessed by use of pressure vacuum meter reading. Pulmonary function was assessed by use of spirometry. Functional capacity was assessed by use of walked distance and oxygen consumption obtained in the six-minute walk test (6MWT). For eight weeks, the inspiratory muscle training (IMT) protocol was applied during hemodialysis sessions, with load set to 40% of PImax and weekly frequency of three alternate days. A significant increase in the walked distance was observed after training (455.5 ± 98 versus 557.8 ± 121.0; p = 0.003). No statistically significant difference was observed in the other variables when comparing their pre- and posttraining values. The study showed no statistically significant difference in respiratory muscle strength, pulmonary function, and oxygen consumption. An increase in the walked distance was observed in the 6MWT.

  19. Numerical calculation of hemolysis levels in peripheral hemodialysis cannulas

    NARCIS (Netherlands)

    De Wachter, D; Verdonck, P

    Hemolysis in extracorporeal life support systems presents an underestimated problem. In this article, we investigate the hemolytic potential of peripheral hemodialysis cannulas numerically. An axisymmetrical finite element model of 3 cannula sizes was built (13G, 14G, and 16G) that was refined

  20. Metabolic syndrome in hemodialysis patients as a risk factor for new-onset diabetes mellitus after renal transplant: a prospective observational study

    Directory of Open Access Journals (Sweden)

    Bonet J

    2013-09-01

    Full Text Available Josep Bonet1, Albert Martinez-Castelao2, Beatriz Bayés11Department of Nephrology, Hospital Universitari Germans Trias i Pujol, Badalona, Spain; 2Department of Nephrology, Hospital Universitari de Bellvitge, IDIBELL, Hospitalet de Llobregat, Barcelona, SpainPurpose: Metabolic syndrome is a cluster of biochemical abnormalities including cardiovascular and diabetes risk factors. The development of diabetes mellitus after renal transplant represents a major posttransplant complication that may adversely affect graft/patient survival. The aim of this study was to assess the role of metabolic syndrome in patients on hemodialysis as a risk factor for the incidence of new-onset diabetes mellitus after renal transplant.Patients and methods: This was a prospective observational epidemiologic study carried out in adult nondiabetic patients undergoing chronic hemodialysis and on the renal transplant waiting list between November 2008 and April 2009. Patients were followed up from Visit 1 (baseline to 6 months after the renal transplant. The analysis of the role of metabolic syndrome in hemodialysis patients as a risk factor for the incidence of new-onset diabetes mellitus after renal transplant included the estimation of relative risk and its 95% confidence interval (CI.Results: A total of 383 evaluable patients were entered into the study (mean age, 52.7 years; male, 57.7%; Caucasian, 90.1%. The prevalence of metabolic syndrome on hemodialysis was 30.4% (95% CI, 25.8%–35.4%. Hypertension was the most prevalent criterion for metabolic syndrome (65.0%, followed by low levels of high-density lipoprotein cholesterol (52.7%, abdominal obesity (36.2%, hypertriglyceridemia (32.4%, and impaired glucose (8.9%. After the renal transplant, the prevalence of metabolic syndrome was still 25.8%. During the posttransplant period, the incidence of new-onset diabetes mellitus reached 13.0% (95% CI, 7.8%–20.6% and patients with pretransplant metabolic syndrome were 2

  1. Infective spondylodiscitis in patients on maintenance hemodialysis: a case series.

    Science.gov (United States)

    Lu, Yueh-An; Hsu, Hsiang-Hao; Kao, Huang-Kai; Lee, Chia-Hui; Lee, Shen-Yang; Chen, Guan-Hsing; Hung, Cheng-Chieh; Tian, Ya-Chung

    2017-11-01

    Infective spondylodiscitis is a rare disease. This case review describes the clinical course, risk factors, and outcomes of adult patients on maintenance hemodialysis who presented with infective spondylodiscitis at a single medical center in Taiwan. There were 18 cases (mean age: 64.9 ± 10.8 years) over more than 10 years. Analysis of underlying diseases indicated that 50% of patients had diabetes, 55.6% had hypertension, 55.6% had coronary artery disease, 22.2% had congestive heart failure, 22.2% had a cerebral vascular accident, 16.7% had liver cirrhosis, and 11.1% had malignancies. Sixty-one percent of patients had a degenerative spinal disease and the most common symptom was back pain (83.3%). A total of 38.9% of patients had leukocytosis, 99.4% had elevated levels of C-reactive protein, 78.6% had elevated erythrocyte sedimentation rates, and 55.6% had elevated levels of alkaline phosphatase. The average hemodialysis duration was 72.8 ± 87.5 months, and 8 patients (44.4%) started hemodialysis within 1 year prior to infective spondylodiscitis. Four patients (22.2%) had vascular access infection-associated spondylodiscitis. The lumbar region was the most common location of infection (77.8%), 44.4% of patients developed abscesses, and Staphylococci were the most common pathogen (38.9%). The mortality rate was 16.7%, all due to sepsis. Thirty-three percent of the survivors had recurrent infective spondylodiscitis within 1 year. Infective spondylodiscitis should be considered in hemodialysis patients who present with prolonged back pain with or without fever. Non-contrast MRI is an appropriate diagnostic tool for this condition. Vascular access infection increases the risk for infective spondylodiscitis in hemodialysis patients.

  2. Phosphate Kinetic Models in Hemodialysis: A Systematic Review.

    Science.gov (United States)

    Laursen, Sisse H; Vestergaard, Peter; Hejlesen, Ole K

    2018-01-01

    Understanding phosphate kinetics in dialysis patients is important for the prevention of hyperphosphatemia and related complications. One approach to gain new insights into phosphate behavior is physiologic modeling. Various models that describe and quantify intra- and/or interdialytic phosphate kinetics have been proposed, but there is a dearth of comprehensive comparisons of the available models. The objective of this analysis was to provide a systematic review of existing published models of phosphate metabolism in the setting of maintenance hemodialysis therapy. Systematic review. Hemodialysis patients. Studies published in peer-reviewed journals in English about phosphate kinetic modeling in the setting of hemodialysis therapy. Modeling equations from specific reviewed studies. Changes in plasma phosphate or serum phosphate concentrations. Of 1,964 nonduplicate studies evaluated, 11 were included, comprising 9 different phosphate models with 1-, 2-, 3-, or 4-compartment assumptions. Between 2 and 11 model parameters were included in the models studied. Quality scores of the studies using the Newcastle-Ottawa Scale ranged from 2 to 11 (scale, 0-14). 2 studies were considered low quality, 6 were considered medium quality, and 3 were considered high quality. Only English-language studies were included. Many parameters known to influence phosphate balance are not included in existing phosphate models that do not fully reflect the physiology of phosphate metabolism in the setting of hemodialysis. Moreover, models have not been sufficiently validated for their use as a tool to simulate phosphate kinetics in hemodialysis therapy. Copyright © 2017 National Kidney Foundation, Inc. Published by Elsevier Inc. All rights reserved.

  3. Nutritional knowledge in hemodialysis patients and nurses: focus on phosphorus.

    Science.gov (United States)

    Cupisti, Adamasco; Ferretti, Valerio; D'Alessandro, Claudia; Petrone, Isabella; Di Giorgio, Adriana; Meola, Mario; Panichi, Vincenzo; Conti, Paolo; Lippi, Alberto; Caprioli, Raffaele; Capitanini, Alessandro

    2012-11-01

    To assess the knowledge of adult hemodialysis patients and nurses working in dialysis units, specifically with regard to knowledge of phosphorus and other nutrients related to dietary management of end-stage renal disease. Cross-sectional cohort study. Hemodialysis unit. One hundred ninety-one hemodialysis patients and 105 dialysis nurses, as well as 86 control hospital employees who are not health professionals. Nutritional knowledge was assessed by a 25-item chronic kidney disease knowledge assessment tool for nutrition, which includes 15 questions on phosphorus and 10 questions on protein, sodium, and potassium knowledge. The scores obtained by patients were much lower than those of nurses (11.6 ± 3.9 vs. 16.0 ± 2.2, P Patients with phosphorus serum level >5.5 mg/dL showed chronic kidney disease knowledge assessment tool for nutrition scores similar to those of patients with a serum phosphorus level patients (38.4% ± 17.8% vs. 57.3% ± 19.9%, P nutritional knowledge of hemodialysis patients, although higher than the general population, is lower for phosphorus with respect to the other nutrients, such as protein, sodium, and potassium. This occurs even in patients with hyperphosphatemia or those taking phosphate binder medications. Nurses showed the best scores; however, improvement is necessary, especially with regard to knowledge of phosphorus. Training programs on nutrition for nurses and on information for patients should be implemented. They can contribute to achievement of a more effective control of phosphate balance, reduction of costs, and improvement of the quality of care for hemodialysis patients. Copyright © 2012 National Kidney Foundation, Inc. Published by Elsevier Inc. All rights reserved.

  4. TTV as A Risk Factor in Hemodialysis Process

    International Nuclear Information System (INIS)

    Ibrahim, I.M.

    2010-01-01

    The association of TTV (transfusion transmitted virus) with both cryptogenic chronic liver diseases and post-transfusion hepatitis has been reported. Hemodialysis patients are at high risk for viral hepatitis due to blood born viral agents. The few data available concerning TTV infection among hemodialysis patients shows a high prevalence. This study was conducted on one hundred patients with end-stage renal disease (ESRD). They were attending the hemodialysis (HD) unit of Naser institute for performing hemodialysis for the first time (as a control group) and the same patients after recurrent HD for at least six months of regular HD (as a HD patient group). Patients and controls were subjected to the following laboratory investigations; 1) TTV DNA detection by PCR. 2) HBs Ag by ELISA technique. 3) HCV Ab by ELISA technique. 4) Liver enzymes include ALT, AST and γGT. The study was done to detect TTV DNA by PCR in hemodialysis patients and to evaluate its clinical impacts, taking into account co-infection with other hepatitis viruses. The results of this work are:- 1- TTV is remarkably prevalent in HD patients. The prevalence of TTV infection in HD Egyptian patients was 45% and 9% in healthy volunteer from the same geographical area. 2- HCV was found to have highly significant association with HD patients while there was no association between HD patients and HBs Ag. 3- TTV infection was not found to be more prevalent in HD patients infected with HCV. 4- Abnormal liver enzymes were uncommon in HD patients infected with TTV alone, in contrast to patients with known hepatotropic viruses such as HCV. 5- TTV did not play a role in liver injury, but it might aggravate liver diseases caused by HCV.

  5. Radiation-Induced Graft Polymerization: Gamma Radiation and Electron Beam Technology for Materials Development

    International Nuclear Information System (INIS)

    Madrid, Jordan F.; Cabalar, Patrick Jay; Lopez, Girlie Eunice; Abad, Lucille V.

    2015-01-01

    The formation of functional hybrid materials by attaching polymer chains with advantageous tailored properties to the surface of a base polymer with desirable bulk character is an attractive application of graft copolymerization. Radiation-induced graft polymerization (RIGP) has been a popular approach for surface modification of polymers because of its merits over conventional chemical processes. RIGP, which proceeds primarily via free radical polymerization process, has the advantages such as simplicity, low cost, control over process and adjustment of the materials composition and structure. RIGP can be performed using either electron beam or gamma radiation and it can be applied to both synthetic and natural polymers. These merits make RIGP a popular research topic worldwide. Moreover, the materials synthesized and produced via RIGP has found applications, and were proposed to produce continuous impact, in the fields of medicine, agriculture, pollution remediation, rare earth and valuable metals recovery, fuel cell membrane synthesis and catalysis to name a few. From 2012 our group has performed electron beam and gamma radiation-induced graft polymerization of various monomers onto polymers of natural and synthetic origins (e.g. monomers - glycidyl methacrylate, styrene, acrylonitrile, N,N-dimethylaminoethyl methacrylate; base polymers – polyethylene/polypropylene nonwoven fabric, polypropylene nonwoven fabric pineapple fibers, cellulose nonwoven fabric microcrystalline cellulose). We tested these grafted materials for heavy metals (Pb, Ni, Cu) and organic molecule removal from aqueous solutions and E. coli activity (using reversible addition fragmentation chain transfer RAFT mediated grafting). The results clearly showed the success of materials modified via FIGP in these applications. Currently, we are studying the applications of grafted materials on treatment of waste waters from tanning industry, value addition to abaca nonwoven fabrics cell sheet

  6. 18F-FDG uptake in noninfected prosthetic vascular grafts: incidence, patterns, and changes over time.

    Science.gov (United States)

    Keidar, Zohar; Pirmisashvili, Natalia; Leiderman, Max; Nitecki, Samy; Israel, Ora

    2014-03-01

    (18)F-FDG PET/CT is of value in the diagnosis of prosthetic vascular graft infection, but potential pitfalls related to tracer uptake in noninfected implants have been described. The current study assesses the incidence and patterns of (18)F-FDG uptake over time in noninfected grafts, in relationship to prosthetic material and location. A 12-y PET/CT database was retrospectively searched for cancer patients with prosthetic vascular grafts. Data retrieved from patient files included graft location, material, and time from surgery. Images were reviewed by 2 nuclear medicine physicians in consensus, with the presence and patterns (focal, diffuse homogeneous, inhomogeneous) of increased (18)F-FDG uptake in grafts recorded. The mean standardized uptake value in grafts (SUV-G) and mediastinum (SUV-M) was measured. The ratio of SUV-G to SUV-M (SUV-G/SUV-M) was calculated for each graft. One hundred seven prostheses were identified in 102 studies in 43 cancer patients. Sixty-seven prostheses were made of Dacron, 33 of Gore-Tex, and 7 were native veins. No increased (18)F-FDG uptake was found in 9 grafts (native veins, 4; Gore-Tex, 3; Dacron, 2). There was diffuse homogeneous uptake in 68 and inhomogeneous uptake in 30 grafts. The homogeneous pattern was more prevalent in Gore-Tex whereas the inhomogeneous uptake was seen more in Dacron vascular grafts. None of the grafts demonstrated focal uptake. The SUV-G range was 0.4-6.3 (average, 1.9), and SUV-M range was 0.6-2.4 (average, 1.4). The intensity of uptake was significantly higher in Dacron (SUV-G = 2.35 and SUV-G/SUV-M = 1.72) than in Gore-Tex (SUV-G = 1.09, SUV-G/SUV-M = 0.91) and native vein grafts (SUV-G = 1.07, SUV-G/SUV-M = 0.75) (P < 0.005). Native vein grafts showed a significant decrease in (18)F-FDG uptake over time whereas synthetic grafts showed no change in intensity for a follow-up of up to 16 y. Diffuse (18)F-FDG uptake was found in 92% of noninfected vascular prostheses, more in Dacron grafts than with

  7. Synthetic guide star generation

    Science.gov (United States)

    Payne, Stephen A [Castro Valley, CA; Page, Ralph H [Castro Valley, CA; Ebbers, Christopher A [Livermore, CA; Beach, Raymond J [Livermore, CA

    2008-06-10

    A system for assisting in observing a celestial object and providing synthetic guide star generation. A lasing system provides radiation at a frequency at or near 938 nm and radiation at a frequency at or near 1583 nm. The lasing system includes a fiber laser operating between 880 nm and 960 nm and a fiber laser operating between 1524 nm and 1650 nm. A frequency-conversion system mixes the radiation and generates light at a frequency at or near 589 nm. A system directs the light at a frequency at or near 589 nm toward the celestial object and provides synthetic guide star generation.

  8. Synthetic Aperture Sequential Beamforming

    DEFF Research Database (Denmark)

    Kortbek, Jacob; Jensen, Jørgen Arendt; Gammelmark, Kim Løkke

    2008-01-01

    A synthetic aperture focusing (SAF) technique denoted Synthetic Aperture Sequential Beamforming (SASB) suitable for 2D and 3D imaging is presented. The technique differ from prior art of SAF in the sense that SAF is performed on pre-beamformed data contrary to channel data. The objective...... is stored. The second stage applies the focused image lines from the first stage as input data. The SASB method has been investigated using simulations in Field II and by off-line processing of data acquired with a commercial scanner. The performance of SASB with a static image object is compared with DRF...

  9. Results of Infrainguinal Bypass with a Composite Graft Combining Polytetrafluoroethylene and Vein Graft in Absence of Appropriate Saphenous Vein Graft.

    Science.gov (United States)

    Jin, Myung Jae; Park, Ui Jun; Kim, Hyoung Tae; Roh, Young-Nam

    2017-06-01

    Use of a composite graft combining a polytetrafluoroethylene graft with an autogenous vein is an option for limb salvage in the absence of an adequate single segment vein graft. We aimed to investigate the results of infrainguinal bypass with a composite graft. We retrospectively reviewed 11 infrainguinal arterial bypasses on 11 limbs which underwent surgery from March 2012 to November 2016. Critical limb ischemia was common (63.6%) indication of bypass surgery and most (90.9%) of the patients had history of failed previous treatment including endovascular treatment (36.4%) and bypass surgery (72.7%). At the 2 years after graft implantations, primary patency and amputation-free survival of below-knee bypasses using composite graft were 73% and 76%, respectively. Infrainguinal arterial bypasses with composite graft had an acceptable patency. In patients without other alternative conduits for revascularization, bypass with a composite graft can be an option.

  10. Plant grafting: new mechanisms, evolutionary implications

    Directory of Open Access Journals (Sweden)

    Eliezer E Goldschmidt

    2014-12-01

    Full Text Available Grafting, an old plant propagation practice, is still widely used with fruit trees and in recent decades also with vegetables. Taxonomic proximity is a general prerequisite for successful graft-take and long-term survival of the grafted, composite plant. However, the mechanisms underlying interspecific graft incompatibility are as yet insufficiently understood. Hormonal signals, auxin in particular, are believed to play an important role in the wound healing and vascular regeneration within the graft union zone. Long-distance protein, mRNA and small RNA graft-transmissible signals currently emerge as novel mechanisms which regulate nutritional and developmental root/top relations and may play a pivotal role in grafting physiology. Grafting also has significant pathogenic projections. On one hand, stock to scion mechanical contact enables the spread of diseases, even without a complete graft union. But, on the other hand, grafting onto resistant rootstocks serves as a principal tool in the management of fruit tree plagues and vegetable soil-borne diseases. The ‘graft hybrid’ historic controversy has not yet been resolved. Recent evidence suggests that epigenetic modification of DNA-methylation patterns may account for certain graft-transformation phenomena. Root grafting is a wide spread natural phenomenon; both intraspecific and interspecific root grafts have been recorded. Root grafts have an evolutionary role in the survival of storm-hit forest stands as well as in the spread of devastating diseases. A more fundamental evolutionary role is hinted by recent findings that demonstrate plastid and nuclear genome transfer between distinct Nicotiana species in the graft union zone, within a tissue culture system. This has led to the formation of alloploid cells that, under laboratory conditions, gave rise to a novel, alloploid Nicotiana species, indicating that natural grafts may play a role in plant speciation. under certain circumstances.

  11. Plant grafting: new mechanisms, evolutionary implications.

    Science.gov (United States)

    Goldschmidt, Eliezer E

    2014-01-01

    Grafting, an old plant propagation practice, is still widely used with fruit trees and in recent decades also with vegetables. Taxonomic proximity is a general prerequisite for successful graft-take and long-term survival of the grafted, composite plant. However, the mechanisms underlying interspecific graft incompatibility are as yet insufficiently understood. Hormonal signals, auxin in particular, are believed to play an important role in the wound healing and vascular regeneration within the graft union zone. Incomplete and convoluted vascular connections impede the vital upward and downward whole plant transfer routes. Long-distance protein, mRNA and small RNA graft-transmissible signals currently emerge as novel mechanisms which regulate nutritional and developmental root/top relations and may play a pivotal role in grafting physiology. Grafting also has significant pathogenic projections. On one hand, stock to scion mechanical contact enables the spread of diseases, even without a complete graft union. But, on the other hand, grafting onto resistant rootstocks serves as a principal tool in the management of fruit tree plagues and vegetable soil-borne diseases. The 'graft hybrid' historic controversy has not yet been resolved. Recent evidence suggests that epigenetic modification of DNA-methylation patterns may account for certain graft-transformation phenomena. Root grafting is a wide spread natural phenomenon; both intraspecific and interspecific root grafts have been recorded. Root grafts have an evolutionary role in the survival of storm-hit forest stands as well as in the spread of devastating diseases. A more fundamental evolutionary role is hinted by recent findings that demonstrate plastid and nuclear genome transfer between distinct Nicotiana species in the graft union zone, within a tissue culture system. This has led to the formation of alloploid cells that, under laboratory conditions, gave rise to a novel, alloploid Nicotiana species, indicating

  12. A numerical study on the effect of hematocrit on hemodynamic characteristics in arteriovenous graft

    Science.gov (United States)

    Kim, Ji Tae; Sung, Kun Hyuk; Ryou, Hong Sun

    2014-08-01

    Stenosis at an arteriovenous graft is related with the critical ranges of hemodynamic characteristics. Hematocrit has a significant effect on the blood viscosity. During hemodialysis, hematocrit is changed by the dialysis machine. The effect of hematocrit on hemodynamic characteristics is investigated by numerical study. A multiphase non-Newtonian blood model was used to analyze the changes of hematocrit. The hematocrit of blood flows at injection needle changed 40%, 50%, and 60%. As a result, the blood viscosity increased by about 6% point. Also, the high wall shear stress region (over 3 Pa) increased about 6% point when the hematocrit at the vein anastomosis increased by about 2% point. When the hematocrit increased by 4% at the vein anastomosis, an extremely high wall shear stress region (over 7.5 Pa) increased by 3 times. Thus, the variation of hematocrit should be predicted using a multiphase blood model to avoid the critical range of wall shear stress when hematocrit changes regionally.

  13. Clinical Performance of a Salivary Amylase Activity Monitor During Hemodialysis Treatment

    Directory of Open Access Journals (Sweden)

    Masaru Shimazaki

    2008-01-01

    Full Text Available The hemodialysis procedure is thought to be a physical stressor in the majority of hemodialyzed patients. Previous studies suggest that elevated salivary amylase level may correlate with increased plasma norepinephrine level under psychological and physical stress conditions. In this study, we investigated biological stress reactivity during hemodialysis treatment using salivary amylase activity as a biomarker. Seven patients (male/female = 5/2, age:67.7+ /− 5.9 years who had been receiving regular 4 h hemodialysis were recruited. Salivary amylase activity was measured using a portable analyzer every hour during the hemodialysis session. Salivary amylase activity was shown to be relatively stable and constant throughout hemodialysis, whereas there were significant changes in systolic blood pressure and pulse rate associated with blood volume reduction. Our results show that hemodialysis treatment per se dose not affect salivary amylase activity.

  14. EVALUATION OF NUTRITIONAL STATUS IN HEMODIALYSIS PATIENTS

    Directory of Open Access Journals (Sweden)

    Amel Harzallah

    2016-08-01

    Full Text Available Malnutrition is a common problem among hemodialysis patients. This factor leads to increased morbidity and mortality. This study evaluates the nutritional status of patients on dialysis and analyses the various parameters used for assessing malnutrition. It is a cross-sectional study of 35 patients aged 18 years and up who have undergone dialysis three days a week for more than a year. The following were analysed: overall subjective assessment technique, Body Mass Index, anthropometric data and biological parameters (serum albumin, serum cholesterol, rate of alkaline reserves and C-reactive protein levels with a dietary three-day survey. Analysis of food survey data was performed using the software Bilnut. The patients’ average age was 46.7 years with a sex ratio of 1.18. Average waist size was 92.7±16.68 cm. Average arm circumference was 27.2±5.6 cm and average calf circumference was 32.03±5.87 cm. Malnutrition was found in 48% of cases according to SGA. Average BMI was 24.4 kg/m2. It was less than 23 Kg/m2 in 48% of cases. Average serum albumin concentration was 33.6 g/l and average CRP level was 6.16 mg/l. The average energy intake (Kcal/Kg/day was 30.87±11.92 the day of dialysis, 27.98±9.31 on a resting day and 29.93±9.42 on another day and the average protein intake (g/kg/day was 1.02±0.44 the day of dialysis, 0.94±0.36 a resting day and 1.04±0.36 on the other day. Malnutrition was frequent among our patients. The assessment of nutritional status in patients on dialysis requires simultaneous combination of several clinical, biologic and dietetic markers. Dietary management is mainly based on food survey regularly established.

  15. A mechanical argument for the differential performance of coronary artery grafts.

    Science.gov (United States)

    Prim, David A; Zhou, Boran; Hartstone-Rose, Adam; Uline, Mark J; Shazly, Tarek; Eberth, John F

    2016-02-01

    Coronary artery bypass grafting (CABG) acutely disturbs the homeostatic state of the transplanted vessel making retention of graft patency dependent on chronic remodeling processes. The time course and extent to which remodeling restores vessel homeostasis will depend, in part, on the nature and magnitude of the mechanical disturbances induced upon transplantation. In this investigation, biaxial mechanical testing and histology were performed on the porcine left anterior descending artery (LAD) and analogs of common autografts, including the internal thoracic artery (ITA), radial artery (RA), great saphenous vein (GSV) and lateral saphenous vein (LSV). Experimental data were used to quantify the parameters of a structure-based constitutive model enabling prediction of the acute vessel mechanical response pre-transplantation and under coronary loading conditions. A novel metric Ξ was developed to quantify mechanical differences between each graft vessel in situ and the LAD in situ, while a second metric Ω compares the graft vessels in situ to their state under coronary loading. The relative values of these metrics among candidate autograft sources are consistent with vessel-specific variations in CABG clinical success rates with the ITA as the superior and GSV the inferior graft choices based on mechanical performance. This approach can be used to evaluate other candidate tissues for grafting or to aid in the development of synthetic and tissue engineered alternatives. Copyright © 2015 Elsevier Ltd. All rights reserved.

  16. Preparation and Grafting Functionalization of Self-Assembled Chitin Nanofiber Film

    Directory of Open Access Journals (Sweden)

    Jun-ichi Kadokawa

    2016-07-01

    Full Text Available Chitin is a representative biomass resource comparable to cellulose. Although considerable efforts have been devoted to extend novel applications to chitin, lack of solubility in water and common organic solvents causes difficulties in improving its processability and functionality. Ionic liquids have paid much attention as solvents for polysaccharides. However, little has been reported regarding the dissolution of chitin with ionic liquids. The author found that an ionic liquid, 1-allyl-3-methylimidazolium bromide (AMIMBr, dissolved chitin in concentrations up to ~4.8 wt % and the higher contents of chitin with AMIMBr gave ion gels. When the ion gel was soaked in methanol for the regeneration of chitin, followed by sonication, a chitin nanofiber dispersion was obtained. Filtration of the dispersion was subsequently carried out to give a chitin nanofiber film. A chitin nanofiber/poly(vinyl alcohol composite film was also obtained by co-regeneration approach. Chitin nanofiber-graft-synthetic polymer composite films were successfully prepared by surface-initiated graft polymerization technique. For example, the preparation of chitin nanofiber-graft-biodegradable polyester composite film was achieved by surface-initiated graft polymerization from the chitin nanofiber film. The similar procedure also gave chitin nanofiber-graft-polypeptide composite film. The surface-initiated graft atom transfer radical polymerization was conducted from a chitin macroinitiator film derived from the chitin nanofiber film.

  17. Vascularized osseous graft for scaphoid

    International Nuclear Information System (INIS)

    Mendez Daza, Carlos Hernan; Mathoulin, Cristophe

    2004-01-01

    The most commonly used technique for treatment of pseudo-arthrosis of the scaphoid is osteo-synthesis with Kirschnet wires and cortical sponge grafts. Results reported by different teams using this procedure show no more than 90% osseous consolidation, especially in cases where vascularisation of the proximal fragment of the scaphoid is compromised. Here we present a series of ten cases of pseudo-arthrosis of the scaphoid, treated using a new surgical technique involving a vascularized osseous graft of the distal radius. Using this procedure we obtained 100% consolidation, with no complications either during the procedure or immediately post-operatively. Patients returned to work in week 15 on average. In 4 cases we observed discomfort in the area of the scar, which was successfully treated using local cortisone injection. The results obtained are very similar to those seen in the literature on the different techniques for vascularized osseous grafts for pseudo-arthrosis of the scaphoid

  18. Vascular Reconstruction Technique Using a Tubular Graft for Leiomyosarcoma of the Inferior Vena Cava: A Case Report

    Directory of Open Access Journals (Sweden)

    C. Higutchi

    Full Text Available Objective/background: This study is a case report that addresses the key aspects of vascular reconstruction, as well as the intraoperative complications, postoperative morbidity, and possibility of adjunctive therapy. Methods: This article reports the case of a 46 year old female patient with a leiomyosarcoma located in the middle segment of the inferior vena cava (between the renal and hepatic veins who underwent surgical resection with vena cava reconstruction and insertion of a tubular graft made of a synthetic material. Results: This case report reveals that surgical resection of the tumor with the insertion of a smaller-caliber tubular graft provide better patency of the vena cava reconstruction, which was maintained for a year after surgery. In addition, the patient was asymptomatic for lower limb edema, despite having a local recurrence after one year. Surgical resection is the treatment of choice for leiomyosarcoma of the inferior vena cava (LIVC and is the only therapy that offers a chance of cure. Several surgical techniques are used for this condition, especially, reconstruction with a vascular graft using natural or synthetic materials. Conclusion: Due to the aggressiveness of the disease, this study suggests that surgical intervention used may have no influence on a patient's survival outcome. However, vascular reconstruction with a smaller-caliber tubular graft may yield a better prognosis for patients in terms of postoperative symptoms, such as edema and thrombosis. Keywords: Inferior vena cava, Leiomyosarcoma, Synthetic vascular grafting

  19. [Discussion on the building of post market risk analysis method in hemodialysis device].

    Science.gov (United States)

    Xu, Honglei; Peng, Xiaolong; Tian, Xiaojun; Wang, Peilian

    2014-09-01

    This paper discussed the building of post market risk analysis method in hemodialysis device from the point of government supervision. By proposing practical research methods for post market risk identification and estimation on hemodialysis device, providing technical guidance for government to put risk management of hemodialysis device into effect, and offering reference for enterprises to carry out post market risk evaluation on their products as well.

  20. What Are Synthetic Cannabinoids?

    Science.gov (United States)

    ... market and are intended to produce the same effects as illegal drugs. Some of these substances may have been around for years but have reentered the market in altered chemical forms, or due to renewed popularity. False Advertising Synthetic cannabinoid products are often labeled "not for ...

  1. Towards a synthetic chloroplast.

    Directory of Open Access Journals (Sweden)

    Christina M Agapakis

    2011-04-01

    Full Text Available The evolution of eukaryotic cells is widely agreed to have proceeded through a series of endosymbiotic events between larger cells and proteobacteria or cyanobacteria, leading to the formation of mitochondria or chloroplasts, respectively. Engineered endosymbiotic relationships between different species of cells are a valuable tool for synthetic biology, where engineered pathways based on two species could take advantage of the unique abilities of each mutualistic partner.We explored the possibility of using the photosynthetic bacterium Synechococcus elongatus PCC 7942 as a platform for studying evolutionary dynamics and for designing two-species synthetic biological systems. We observed that the cyanobacteria were relatively harmless to eukaryotic host cells compared to Escherichia coli when injected into the embryos of zebrafish, Danio rerio, or taken up by mammalian macrophages. In addition, when engineered with invasin from Yersinia pestis and listeriolysin O from Listeria monocytogenes, S. elongatus was able to invade cultured mammalian cells and divide inside macrophages.Our results show that it is possible to engineer photosynthetic bacteria to invade the cytoplasm of mammalian cells for further engineering and applications in synthetic biology. Engineered invasive but non-pathogenic or immunogenic photosynthetic bacteria have great potential as synthetic biological devices.

  2. Synthetic Metabolic Pathways

    DEFF Research Database (Denmark)

    topics, lists of the necessary materials and reagents, step-by-step, readily reproducible laboratory protocols, and tips on troubleshooting and avoiding known pitfalls. Authoritative and practical, Synthetic Metabolic Pathways: Methods and Protocols aims to ensure successful results in the further study...

  3. Synthetic growth reference charts

    NARCIS (Netherlands)

    Hermanussen, Michael; Stec, Karol; Aßmann, Christian; Meigen, Christof; Van Buuren, Stef

    2016-01-01

    Objectives: To reanalyze the between-population variance in height, weight, and body mass index (BMI), and to provide a globally applicable technique for generating synthetic growth reference charts. Methods: Using a baseline set of 196 female and 197 male growth studies published since 1831, common

  4. A formidable synthetic challenge

    Indian Academy of Sciences (India)

    Isolation and characterization of maoecrystal V, a C19 terpenoid, having potent and selective cytotoxicity towards HeLa cells was recently reported. Unusually complex pentacyclic molecular structure, presence of spirofused rings and several stereogenic centres posed a great synthetic challenge. In this short review, efforts ...

  5. Synthetic antiferromagnetic spintronics

    Science.gov (United States)

    Duine, R. A.; Lee, Kyung-Jin; Parkin, Stuart S. P.; Stiles, M. D.

    2018-03-01

    Spintronic and nanomagnetic devices often derive their functionality from layers of different materials and the interfaces between them. We discuss the opportunities that arise from synthetic antiferromagnets consisting of two or more ferromagnetic layers that are separated by metallic spacers or tunnel barriers and have antiparallel magnetizations.

  6. Crosslinked Radiation-Grafted Films

    Energy Technology Data Exchange (ETDEWEB)

    Slaski, M.; Brack, H.P.; Fischer, D. [Zuercher Hochschule Winterthur (Switzerland); Peter, G. [Zuercher Hochschule Winterthur (Switzerland); Wokaun, A.; Scherer, G.G.

    2004-03-01

    Radiation-grafted membranes prepared by using styrene (S) and divinyl benzene (DVB) as graft components and subsequent sulfonation can be applied as solid polymer electrolytes in fuel cells and other electrochemical devices. The use of DVB as crosslinker has an important influence on the ex-situ properties like swelling, ionic resistivity, mechanical properties, surface energy, and oxidative stability. DVB also influences gas crossover, polarization performance, and lifetime in the fuel cell application. In spite of this importance, the actual DVB content and its extent of reaction has not been well investigated. (author)

  7. Reconstruction of mandible with pedicle bone grafts.

    Science.gov (United States)

    Kowalik, S

    1980-02-01

    Three cases of pedicle bone grafts used to reconstruct the mandible are presented. The grafts were taken from the shoulder blade, rib and clavicle. In two patients partial and in one patient total mandibles were reconstructed. Good results were obtained.

  8. Evaluation of Replacement Grafts and Punch Grafts in the Treatment of Vitiligo

    Directory of Open Access Journals (Sweden)

    Singh Ajit Kumar

    1980-01-01

    Full Text Available Thirtycasesof vitiligo eachwithminimum of two lesions undent replacement graft and multiple punch grafts in one lesion each. Complications observed at the recipient site like infection and raised nigosed surface were significantly more in replacement grafts. Hypopigmentation of the graft was significantly more when the disease was progressive.

  9. Synthetic Plant Defense Elicitors

    Directory of Open Access Journals (Sweden)

    Yasemin eBektas

    2015-01-01

    Full Text Available To defend themselves against invading pathogens plants utilize a complex regulatory network that coordinates extensive transcriptional and metabolic reprogramming. Although many of the key players of this immunity-associated network are known, the details of its topology and dynamics are still poorly understood. As an alternative to forward and reverse genetic studies, chemical genetics-related approaches based on bioactive small molecules have gained substantial popularity in the analysis of biological pathways and networks. Use of such molecular probes can allow researchers to access biological space that was previously inaccessible to genetic analyses due to gene redundancy or lethality of mutations. Synthetic elicitors are small drug like molecules that induce plant defense responses, but are distinct from known natural elicitors of plant immunity. While the discovery of the some synthetic elicitors had already been reported in the 1970s, recent breakthroughs in combinatorial chemical synthesis now allow for inexpensive high-throughput screens for bioactive plant defense-inducing compounds. Along with powerful reverse genetics tools and resources available for model plants and crop systems, comprehensive collections of new synthetic elicitors will likely allow plant scientists to study the intricacies of plant defense signaling pathways and networks in an unparalleled fashion. As synthetic elicitors can protect crops from diseases, without the need to be directly toxic for pathogenic organisms, they may also serve as promising alternatives to conventional biocidal pesticides, which often are harmful for the environment, farmers and consumers. Here we are discussing various types of synthetic elicitors that have been used for studies on the plant immune system, their modes-of-action as well as their application in crop protection.

  10. Hepatitis C Is Less Aggressive in Hemodialysis Patients than in Nonuremic Patients

    Science.gov (United States)

    Trevizoli, Jose Eduardo; de Paula Menezes, Raissa; Ribeiro Velasco, Lara Franciele; Amorim, Regina; de Carvalho, Mauro Birche; Mendes, Liliana Sampaio; Neto, Columbano Junqueira; de Deus Macedo, José Roberto; de Assis, Francisco; Neves, Rocha

    2008-01-01

    Background and objectives: The severity of liver disease among hepatitis C patients on hemodialysis is controversial. The aim of this study was to compare the clinical, biochemical, and liver histologic characteristics of hepatitis C virus (HCV) in hemodialysis patients and in those with normal renal function. Design, setting, participants, & measurements: A case-control study was carried out with 36 HCV patients on hemodialysis and 37 HCV patients with normal renal function matched for gender, age at infection, and estimated time of infection. Results: HCV patients on hemodialysis had lower levels of alanina aminotransferase and lower viral load. Hepatic fibrosis was significantly higher in the patients with normal renal function (73%) than in hemodialysis patients (47.2%, P < 0.025); the same was observed for inflammatory activity (control group 59.5% versus hemodialysis patients 27.7%, P = 0.003). In addition, the risk of tissue inflammation was four times lower in hemodialysis patients (odds ratio = 0.23, P < 0.004), and severe inflammatory activity on biopsy was the only independent risk factor for fibrosis (P < 0.001). Conclusions: The lower biochemical and inflammatory activities observed in hemodialysis patients suggest that hemodialysis and uremia may have a protective role against progression of the disease caused by HCV. PMID:18650408

  11. Power injection of iodinated intravenous contrast material through acute and chronic hemodialysis catheters.

    Science.gov (United States)

    Hollander, Scott; Mojibian, Hamid; Emery, Michael; Tal, Michael G

    2012-01-01

    End-stage renal disease patients with hemodialysis catheters in need of contrast enhanced imaging studies often have limited peripheral venous access. In this study we aimed to determine pressures generated in hemodialysis catheters during power injection of computed tomography (CT) contrast media. Three different chronic hemodialysis catheters and two acute hemodialysis catheters were included in this study. All catheters were evaluated in vitro. A total volume of 120 cc of CT contrast material was injected at rate of 10 cc/s using a power injector. The catheters were connected to the power injector using a standard connecting tubing. Pressures were simultaneously measured in the power injector as well as in the hemodialysis catheters. The maximal measured pressures during injection in the power injector averaged 338 PSI (SD ± 8.7 PSI). The maximal measured pressure in the dialysis catheters ranged between 9.17 and 21.2 PSI. Pressures averaged 14.02 PSI (SD ± 3.34 PSI). The average pressure in the power injector was over 23 times higher than the pressure recorded at the hemodialysis catheter. None of the catheters ruptured or deformed during testing. Pressures measured in hemodialysis catheters during power injection are lower than currently believed and markedly lower than the pressures recorded in the power injector. Standard hemodialysis catheters are likely to be amenable to power contrast injection in hemodialysis patients who have limited venous access. In vivo studies are necessary to confirm these findings.

  12. Study of Serum Levels of Leptin, C-Reactive Protein and Nutritional Status in Hemodialysis Patients.

    Science.gov (United States)

    Montazerifar, Farzaneh; Karajibani, Mansour; Hassanpour, Zahra; Pourmofatteh, Mahla

    2015-08-01

    Leptin is secreted by adipose tissue and decreases appetite. However, the role of leptin in the pathogenesis of hemodialysis (HD)-related malnutrition has not been fully evaluated. The aim of study was to investigate the association between the serum leptin levels, serum C-reactive protein (CRP) levels, and nutritional status in hemodialysis patients. This analytical descriptive study included 45 hemodialysis patients and 40 healthy subjects. Biochemical parameters and serum leptin levels were measured. The nutritional status was evaluated using a food frequency questionnaire (FFQ) and the calculation of the body mass index (BMI). Serum leptin (P nutritional factors in hemodialysis patients.

  13. Adipokines and nutritional status for patients on maintenance hemodialysis.

    Science.gov (United States)

    Małgorzewicz, S; Aleksandrowicz-Wrona, E; Owczarzak, A; Debska-Slizień, A; Rutkowski, B; Łysiak-Szydłowska, W

    2010-09-01

    The aim of this study was to investigate the serum concentration of adipokines, such as leptin, adiponectin, and resistin, and assess its relation to nutritional and inflammatory parameters in both overweight and normal weight patients on maintenance hemodialysis. A total of 36 hemodialysis patients (27 M, 9 F; mean age 55.3 +/- 12 yr.) were examined and 23 additional healthy volunteers were recruited as the control group. The concentrations of leptin, leptin receptor, adiponectin, resistin, IL-6, TNFa and CRP were measured by ELISA. Assessment of nutritional status was determined by the levels of albumin, BMI, percentage of body fat (%F), lean body mass (LBM), and Subjective Global Assessment Score (SGA). According to the SGA 7-points score and the albumin level, 20 patients were of good nutritional status (6-7 points), while 16 patients were mildly malnourished (4-5 points). The concentrations of CRP, resistin, adiponectin, and TNFa were statistically higher in hemodialysis patients than in the control group (p pound 0.05). The adiponectin level was inversely correlated with %F (R Spearman=-0.3; p pound 0.05). The level of leptin was positively correlated with %F as well as with BMI and SGA scores (R Spearman=0.4; p pound 0.05). Although there was no significant difference in the nutritional status between the nonoverweight (BMI 18.5-24.99) and overweight (BMI (3)25.0) groups of patients, in the nonoverweight group there were 12 patients (54.5%) with signs of mild malnutrition compared to 4 malnourished patients (28.5%) in the overweight group. Nonoverweight patients presented significantly lower leptin concentration (12.7 vs 27.8 ug/l) and higher adiponectin level (38.9 vs 32.5 ng/ml) when compared to overweight patients. The levels of IL-6 and TNFa were higher in the nonoverweight group of patients. Overweight patients also had shorter durations of stay in the hemodialysis program (30.5 vs. 87.6 months). The results of our study indicate that lean hemodialysis

  14. Oral intradialytic nutritional supplement use and mortality in hemodialysis patients.

    Science.gov (United States)

    Weiner, Daniel E; Tighiouart, Hocine; Ladik, Vladimir; Meyer, Klemens B; Zager, Philip G; Johnson, Douglas S

    2014-02-01

    Hemodialysis patients have high mortality rates, potentially reflecting underlying comorbid conditions and ongoing catabolism. Intradialytic oral nutritional supplements may reduce this risk. Retrospective propensity-matched cohort. Maintenance hemodialysis patients treated at Dialysis Clinic Inc facilities who were initiated on a nutritional supplement protocol in September to October 2010 were matched using a propensity score to patients at facilities at which the protocol was not used. Prescription of the protocol, whereby hemodialysis patients with serum albumin levels ≤3.5g/dL would initiate oral protein supplementation during the dialysis procedure. Sensitivity analyses matched on actual supplement intake during the first 3 study months. Covariates included patient and facility characteristics, which were used to develop the propensity scores and adjust multivariable models. All-cause mortality, ascertained though March 2012. Of 6,453 eligible patients in 101 eligible hemodialysis facilities, the protocol was prescribed to 2,700, and 1,278 of these were propensity matched to controls. Mean age was 61 ± 15 (SD) years and median dialysis vintage was 34 months. There were 258 deaths among protocol assignees versus 310 among matched controls during a mean follow-up of 14 months. In matched analyses, protocol prescription was associated with a 29% reduction in the hazard of all-cause mortality (HR, 0.71; 95% CI, 0.58-0.86); adjustment had minimal impact on models. In time-dependent models incorporating change in albumin level, protocol status remained significant but was attenuated in models incorporating a 30-day lag. Similar results were seen in sensitivity analyses of 439 patients receiving supplements who were propensity-matched to controls, with 116 deaths among supplement users versus 140 among controls (HR, 0.79; 95% CI, 0.60-1.05), achieving statistical significance in adjusted models. Observational design, potential residual confounding

  15. New Insights into Dialysis Vascular Access: Molecular Targets in Arteriovenous Fistula and Arteriovenous Graft Failure and Their Potential to Improve Vascular Access Outcomes.

    Science.gov (United States)

    Lee, Timmy; Misra, Sanjay

    2016-08-08

    Vascular access dysfunction remains a major cause of morbidity and mortality in hemodialysis patients. At present there are few effective therapies for this clinical problem. The poor understanding of the pathobiology that leads to arteriovenous fistula (AVF) and graft (AVG) dysfunction remains a critical barrier to development of novel and effective therapies. However, in recent years we have made substantial progress in our understanding of the mechanisms of vascular access dysfunction. This article presents recent advances and new insights into the pathobiology of AVF and AVG dysfunction and highlights potential therapeutic targets to improve vascular access outcomes. Copyright © 2016 by the American Society of Nephrology.

  16. Graft infections after surgical aortic reconstructions

    NARCIS (Netherlands)

    Berger, P.

    2015-01-01

    Prosthetic vascular grafts are frequently used to reconstruct (part) of the aorta. Every surgical procedure caries a certain risk for infection and when a prosthetic aortic graft is implanted, this may lead to an aortic graft infection (AGI). Endovascular techniques have gradually replaced open

  17. Synthetic antifreeze peptide and synthetic gene coding for its production

    OpenAIRE

    1991-01-01

    A synthetic antifreeze peptide and a synthetic gene coding for the antifreeze peptide have been produced. The antifreeze peptide has a greater number of repeating amino acid sequences than is present in the native antifreeze peptides from winter flounder upon which the synthetic antifreeze peptide was modeled. Each repeating amino acid sequence has two polar amino acid residues which are spaced a controlled distance apart so that the antifreeze peptide may inhibit ice formation. The synthetic...

  18. The caudal septum replacement graft.

    Science.gov (United States)

    Foda, Hossam M T

    2008-01-01

    To describe a technique for reconstructing the lost tip support in cases involving caudal septal and premaxillary deficiencies. The study included 120 patients with aesthetic and functional nasal problems resulting from the loss of caudal septal and premaxillary support. An external rhinoplasty approach was performed to reconstruct the lost support using a cartilaginous caudal septum replacement graft and premaxillary augmentation with Mersilene mesh. The majority of cases (75%) involved revisions in patients who had previously undergone 1 or more nasal surgical procedures. A caudal septum replacement graft was combined with premaxillary augmentation in 93 patients (77.5%). The mean follow-up period was 3 years (range, 1-12 years). The technique succeeded in correcting the external nasal deformities in all patients and resulted in a significant improvement in breathing in 74 patients (86%) with preoperative nasal obstruction. There were no cases of infection, displacement, or extrusion. The caudal septum replacement graft proved to be very effective in restoring the lost tip support in patients with caudal septal deficiency. Combining the graft with premaxillary augmentation using Mersilene mesh helped increase support and stability over long-term follow-up.

  19. Endovascular stent grafting: a review

    International Nuclear Information System (INIS)

    Kribs, S.

    2001-01-01

    Endovascular stent grafts are intravascular devices composed of surgical graft material and a metallic frame, (Fig. 1). Their main application has been to treat aneurysms, but they have been used in vascular trauma and are being investigated for use in occlusive disease. Their advantage in treating aneurysms over conventional surgical treatment is that they are loaded into relatively small delivery systems (Fig. 2) and can be introduced to the area of interest from a remote site - usually the femoral artery. This avoids the morbidity of surgical exposure in difficult sites, such as the thoracic aorta, and lessens the cardiovascular stress to patients by eliminating the need to surgically cross-clamp the vessel being treated. The first description of abdominal aortic aneurysm exclusion by an endovascular stent graft was provided by Parodi and colleagues in 1991. Much of the early clinical experience in endovascular stent grafting was obtained from centres in Australia and Europe, and they are now reporting midterm follow-up data. There are now many centres in Canada and the United States involved in endovascular research and practice. (author)

  20. SOME TECHNIQUES IN CORNEAL GRAFTING

    African Journals Online (AJOL)

    1971-04-10

    Apr 10, 1971 ... simulate as nearly as possible the intra-ocular tension of the recipient. In this manner the apposition of the graft to the host cornea is as satisfactory as .... rected to 6/9 in spite of distortion and encroachment of the fibrotic process on the pupillary area. There has been no recurrence and inspection shows.

  1. Multifaceted prospects of nanocomposites for cardiovascular grafts and stents

    Directory of Open Access Journals (Sweden)

    Vellayappan MV

    2015-04-01

    Full Text Available Muthu Vignesh Vellayappan,1 Arunpandian Balaji,1 Aruna Priyadarshini Subramanian,1 Agnes Aruna John,1 Saravana Kumar Jaganathan,1 Selvakumar Murugesan,2 Eko Supriyanto,1 Mustafa Yusof1 1IJN-UTM Cardiovascular Engineering Centre, Faculty of Biosciences and Medical Engineering, Universiti Teknologi Malaysia, Johor Bahru, Malaysia; 2Rubber Technology Center, Indian Institute of Technology, Kharagpur, India Abstract: Cardiovascular disease is the leading cause of death across the globe. The use of synthetic materials is indispensable in the treatment of cardiovascular disease. Major drawbacks related to the use of biomaterials are their mechanical properties and biocompatibility, and these have to be circumvented before promoting the material to the market or clinical setting. Revolutionary advancements in nanotechnology have introduced a novel class of materials called nanocomposites which have superior properties for biomedical applications. Recently, there has been a widespread recognition of the nanocomposites utilizing polyhedral oligomeric silsesquioxane, bacterial cellulose, silk fibroin, iron oxide magnetic nanoparticles, and carbon nanotubes in cardiovascular grafts and stents. The unique characteristics of these nanocomposites have led to the development of a wide range of nanostructured copolymers with appreciably enhanced properties, such as improved mechanical, chemical, and physical characteristics suitable for cardiovascular implants. The incorporation of advanced nanocomposite materials in cardiovascular grafts and stents improves hemocompatibility, enhances antithrombogenicity, improves mechanical and surface properties, and decreases the microbial response to the cardiovascular implants. A thorough attempt is made to summarize the various applications of nanocomposites for cardiovascular graft and stent applications. This review will highlight the recent advances in nanocomposites and also address the need of future research in

  2. A Meta-analysis of randomized clinical trials assessing hemodialysis access thrombosis based on access flow monitoring: Where do we stand?

    Science.gov (United States)

    Muchayi, Timothy; Salman, Loay; Tamariz, Leonardo J; Asif, Arif; Rizvi, Abid; Lenz, Oliver; Vazquez-Padron, Roberto I.; Tabbara, Marwan; Contreras, Gabriel

    2015-01-01

    The National Kidney Foundation Kidney Disease Outcomes Quality Initiative recommends the routine use of hemodialysis arteriovenous (AV) access surveillance to detect hemodynamically significant stenoses and appropriately correct them to reduce the incidence of thrombosis and to improve accesses patency rates. Access blood flow monitoring is considered as one of the preferred surveillance method for both AV fistulas (AVF) and AV grafts (AVG); however, published studies have reported conflicting results of its utility that led healthcare professionals to doubt the benefits of this surveillance method. We performed a meta-analysis of the published randomized controlled trials (RCTs) of AV access surveillance using access blood flow monitoring. Our hypothesis was that access blood flow monitoring lowers the risk of AV access thrombosis and that the outcome differs between AVF and AVG. The estimated overall pooled risk ratio (RR) of thrombosis was 0.87 (95% confidence interval [CI], 0.67 to 1.13) favoring access blood flow monitoring. The pooled RR of thrombosis were 0.64 (95% CI, 0.41 to 1.01) and 1.06 (95% CI, 0.77 to 1.46) in the subgroups of only AVF and only AVG, respectively. Our results added to the uncertainty of access blood flow monitoring as a surveillance method of hemodialysis accesses. PMID:25644548

  3. [Renal replacement therapy by hemodialysis: an overview].

    Science.gov (United States)

    Jacobs, Claude

    2009-07-01

    The replacement of renal function by hemodialysis (HD) demonstrated for the first time that at least the most vital functions of a complex organ could be replaced by a man-made device. The Founding Father of dialysis is the Scottish chemist Thomas Graham who in 1861 found that colloid and crystalloid substances contained in fluids could be separated by diffusion of crystalloids through vegetable parchment acting as a semipermeable membrane. He coined this phenomenon as "dialysis". Fifty years later, using collodion as dialysis membrane and hirudin as anticoagulant (ATG), Abel et al. in Baltimore performed the first dialysis in dogs with a "vivi-diffusion" apparatus shortly after named "artificial kidney"(AK). In 1924, Haas in Germany treated for the first time uremia in man with dialysis using a collodion membrane and a new ATG: "heparin". Disappointed by unsuccessful results achieved with HD, Haas gave up his trials in 1928. HD revived in the early forties when Willem Kolff in the Netherlands built a "rotating drum kidney" using cellophane as dialysis membrane. The first recovery of a patient undergoing HD for acute renal failure (ARF) was reported by Kolff in 1945, paving the way for a rapidly worldwide expanding treatment of ARF with dialysis. The concept of applying HD to patients with end-stage chronic renal failure (ESRF), first pioneered by Alwall in Sweden as far back as 1948, became reality in 1960 when Scribner, Quinton et al. designed an external arteriovenous by pass made of Teflon tubing which allowed a permanent access to the bloodstream without requirement of permanent anticoagulation. The Teflon AV shunt, later improved with the use of a silicone rubber material (Silastic) has been the cornerstone for implementing the long-term treatment of ESRF patients with maintenance HD. The next major breakthrough in this area consisted in the surgically created AV fistula performed in 1966 by Cimino, Brescia et al. which considerably reduced the complications

  4. Mini tunelizador moldável: um avanço técnico no acesso vascular para hemodiálise Mini moldable tunneler: a technical improvement for hemodialysis access

    Directory of Open Access Journals (Sweden)

    Fabio Henrique Rossi

    2011-12-01

    cirurgias de confecção de fístula para hemodiálise. Sua versatilidade e baixo custo de produção podem levá-lo a substituir os tunelizadores rígidos utilizados na atualidade e apontam para estudos mais elaborados e com casuística adequada para avaliação do real valor do novo instrumento.BACKGROUND: Hemodialysis access fistula may involve creation of a tunnel for the accommodation of autologous vein or synthetic graft. The route and extent depend on the location of the anastomosis and fistula body.Currently, the tunnelers used are rigid metallic cylindrical structures. Various sizes and conformations may be necessary. OBJECTIVE: Testing the use of a mini universal moldable tunnel maker in hemodialysis access fistula surgical creation. METHODS: This is a pilot study. The tunneler developed consists of a cylindrical structure composed of stainless steel wire with a handle at the proximal end and dual interchangeable conical tip at the distal end. It is covered with a cylindrical sheath of polyethylene. Its technical surgical application and complications were studied during ten hemodialysis fistula creation. RESULTS: Characteristics of flexibility and conformability made possible the same mini tunnel maker to be used in various types of fistulas performed. The tapered distal tip with double diameter, interchangeable head, allowed the same apparatus to be used in autogenos and graft fistulas surgical creation. CONCLUSION: The same mini malleable tunneler was used in all fistulas, regardless of the site of anastomosis and type of fistula performed without complications and with excellent patency rate.

  5. Membranes prepared by radiation grafting of binary monomers for adsorption of heavy metals from industrial wastes

    Science.gov (United States)

    Hegazy, El-Sayed A.; Kamal, H.; Maziad, N.; Dessouki, A. M.

    1999-05-01

    Preparation of synthetic membranes using simultaneous radiation grafting of acrylic acid (AAc) and styrene (Sty) as individually and in binary monomer mixture onto low density polyethylene (LDPE) has been carried out. The effect of preparation conditions such as irradiation dose, monomer concentration, comonomer composition, and solvent on the grafting yield was investigated. Characterization and some properties of the prepared membranes using different analytical techniques are studied, accordingly the possibility of its practical use in industrial waste treatment is determined. The swelling behavior, electrical conductivity, thermal stability, and mechanical properties of the membranes were investigated as a function of the grafting degree. The prepared cation-exchange membranes possessed good electrical and mechanical properties, high thermal stability and possess good characteristics for separation processes. These membranes have also good affinity toward the adsorption or chelation with Fe 3+ and Pb 2+ ions either in mixture containing other metals or if exists alone in the waste solution.

  6. Laccase catalyzed grafting of-N-OH type mediators to lignin via radical-radical coupling

    DEFF Research Database (Denmark)

    Munk, Line; Punt, A. M.; Kabel, M. A.

    2017-01-01

    Lignin is an underexploited resource in biomass refining. Laccases (EC 1.10.3.2) catalyze oxidation of phenolic hydroxyls using O2 as electron acceptor and may facilitate lignin modification in the presence of mediators. This study assessed the reactivity of four different synthetic mediators...... better than HBT (1-hydroxybenzotriazole). Three different mechanisms are suggested to explain the grafting of HPI and HBT, all involving radical-radical coupling to produce covalent bonding to lignin. Lignin from exhaustive cellulase treatment of wheat straw was more susceptible to grafting than beech...... organosolv lignin with the relative abundance of grafting being 35% vs. 11% for HPI and 5% vs. 1% for HBT on these lignin substrates. The data imply that lignin can be functionalized via laccase catalysis with-N-OH type mediators....

  7. Adsorption of Heavy Metals From Industrial Wastes Using Membranes Prepared by Radiation Grafting

    International Nuclear Information System (INIS)

    Hegazy, E. A.; Kamal, H.; Maziad, N.; Dessouki, A.M.; Aly, H.F.

    1999-01-01

    Preparation of synthetic membranes using simultaneous radiation grafting of acrylic acid (AAc) and styrene (Sty) individually and in a binary monomers mixture onto polypropylene (PP) has been carried out. The effect of preparation conditions such as irradiation dose, monomer and inhibitor concentration, comonomer composition on the grafting yield was investigated. The thermal stability and mechanical properties were also investigated as a function of degree of grafting. Accordingly the possibility of its practical use in industrial waste treatment is determined. The prepared cation-exchange membranes possess good mechanical properties, high thermal stability and good characteristics for separation processes. These membranes have also good affinity toward the adsorption or chelation with Fe 3+ , Pb 2+ , and Cd 2+ ions either in a mixture or exists alone in the solution

  8. Bone Grafts, Substitutes, and Augments in Benign Orthopaedic Conditions Current Concepts.

    Science.gov (United States)

    Blank, Alan; Riesgo, Aldo; Gitelis, Steven; Rapp, Timothy

    2017-04-01

    Musculoskeletal tumors are relatively rare diagnoses made by orthopaedic surgeons. While approximately 2,500 primary bone sarcomas are diagnosed annually in the USA, the number of benign orthopaedic tumors encountered annually is far more difficult to quantify. Some studies have documented between 3% and 10% of the general population having benign bony lesions. Many of these conditions can be simply observed, while others will require surgical intervention. Surgical treatments for benign conditions range from a one-step curettage to extensive resection and reconstruction. With treatment of larger lesions, significant bony defects may need to be addressed surgically. Treatment options have evolved over time with the use of various bone graft and bone void fillers, including methyl methacrylate cement, autograft, allograft bone chips, struts and osteoarticular segments, synthetic bone graft substitutes, and metal augments. This review provides an overview of the present status of bone graft, substitutes, and augment options for the orthopaedic surgeon treating benign musculoskeletal conditions.

  9. Recurrent Hypoglycemia in a Hemodialysis Patient Related to Propoxyphene Treatment

    Directory of Open Access Journals (Sweden)

    Hui-Ting Lee

    2007-07-01

    Full Text Available There are various etiologies for hypoglycemia in patients with chronic renal failure, and its pathogenesis is complex. Concomitant use of medications is the most common cause. We report a rare case of an 82-year-old woman with type 2 diabetes mellitus in end-stage renal disease undergoing maintenance hemodialysis, who experienced recurrent symptomatic hypoglycemia during treatment with propoxyphene for pain relief. Hypoglycemia occurred simultaneously with elevated levels of serum immunoreactive insulin and C-peptide. After discontinuing propoxyphene, hypoglycemia mitigated and the level of insulin returned to normal range. Our case reminds us that propoxyphene-induced hypoglycemia should not be ignored, especially in hemodialysis patients with cold sweats, agitation and depressed consciousness.

  10. [Assessment of periodontal condition of kidney patients in hemodialysis].

    Science.gov (United States)

    Souza, Cláudia Régia Dias de; Libério, Silvana Amado; Guerra, Rosane Nassar Meireles; Monteiro, Silvio; Silveira, Ericka Janine Dantas da; Pereira, Antonio Luiz Amaral

    2005-01-01

    Thirty patients undergoing hemodialysis were evaluated for their periodontal condition through plaque, calculus and gingival indexes; PSR and IgA present in the saliva were also appraised in order to determine the periodontal condition of patients presenting chronic kidney disease. Results obtained demonstrated that in the studied group the plaque, calculus and gingival indexes were high. With regard to these patients' requirement to undergo periodontal treatment, most patients submitted to hemodialysis needed better oral hygiene, in addition to supra and sub gingival scraping and topic application of fluor (code 2). As to the IgA amount present in the saliva, only three patients showed a low density. Patients presenting chronic kidney disease disclosed a tendency for greater bacterial plaque concentration, high formation of dental calculus suggesting the need for periodontal treatment comprising supra and sub gingival scraping.

  11. Osteoprotegerin and mortality in hemodialysis patients with cardiovascular disease

    DEFF Research Database (Denmark)

    Winther, Simon; Christensen, Jeppe Hagstrup; Flyvbjerg, Allan

    2013-01-01

    Abstract BACKGROUND: Patients treated with hemodialysis (HD) have an increased mortality, mainly caused by cardiovascular disease (CVD). Osteoprotegerin (OPG) is a glycoprotein involved in the regulation of the vascular calcification process. Previous studies have demonstrated that OPG.......08; in the adjusted analyses, the p-value for trend was 0.03. CONCLUSIONS: In a high-risk population of hemodialysis patients with previously documented cardiovascular disease, a high level of OPG was an independent risk marker of all-cause mortality....... is a prognostic marker of mortality. The aim of this study was to investigate if OPG was a prognostic marker of all-cause mortality in high-risk patients with end-stage renal disease and CVD. METHODS: We prospectively followed 206 HD patients with CVD. OPG was measured at baseline and the patients were followed...

  12. Complication of Hemodialysis Access: A Case Report of Venous Hypertension

    Directory of Open Access Journals (Sweden)

    Sadegh Asadi

    2018-03-01

    Full Text Available Vascular access for dialysis is essential for these patients with end-stage renal disease, improvements in hemodialysis managment have lead to extended life expectancy. The creation and maintenance of hemoaccess occupies a significant portion of most vascular and general surgery practices.Venous hypertension due to arteriovenous fistula is usually secondary to venous outlet obstruction. Side to side proximal artery arteriovenous fistula serves as a certain cause of hemodialysis, but it is rarely reported as a peripheral venous hypertension cause. We are reporting a case with developed venous hypertension having dermal injuries in the arm. The patient underwent successful side-to-side radio cephalic fistula creation in the snuffbox a year ago.

  13. Nutritional status and interdialytic weight gain of chronic hemodialysis patients.

    Science.gov (United States)

    Ferraz, Sanzia Francisca; Freitas, Ana Tereza Vaz de Souza; Vaz, Inaiana Marques Filizola; Campos, Marta Isabel Valente Andrade Morais; Peixoto, Maria do Rosário Gondim; Pereira, Edna Regina Silva

    2015-01-01

    The nutritional status (NS) of patients on hemodialysis (HD) is a major concern and challenge. Malnutrition is common in these patients and is related to poorer clinical outcomes. To assess the association between the NS and the interdialytic weight gain (IDWG) of patients with chronic kidney disease (CKD) on HD. Cross-sectional study with 322 patients older than 18 years. The NS was assessed by body mass index (BMI), percentage body fat estimated by the sum of four skinfolds (triceps, biceps, subscapular and supra iliac), lean body mass (LBM), serum creatinine and albumin and rate of nitrogen appearance (PNA). The IDWG was evaluated from the sum of the weight difference of 12 hemodialysis sessions (IDWGm). Considering the sample into quartiles IDWGm, it was found that BMI, LBM, serum creatinine ( p nutritional status of these patients.

  14. Opportunistic intestinal parasites in hemodialysis patients - a systematic literature review

    Directory of Open Access Journals (Sweden)

    Solimar Almeida de Oliveira

    2013-12-01

    Full Text Available The objective of this systematic literature review was to identify the occurrence of opportunistic enteric parasites in chronic kidney patient undergoing hemodialysis. The review consisted on searching articles published on MEDLINE, LILACS, SciELO, and PubMed databases between 1991 and 2013. A total 178 articles were identified, ten of which were considered relevant for the present study. In the referred studies, the researchers demonstrated that immunosuppressed patients undergoing hemodialysis are potentially infected by opportunistic enteric agents. Further studies are needed on this topic, as there is a growing global concern with chronic kidney diseases and the potential for these patients contracting opportunistic diseases, which, inclusively, could contaminate hospital environments with opportunistic enteric protozoa. Descriptors: Renal Dialysis; Blastocystis hominis; Cryptosporidium; Cyclospora; Isospora.

  15. [Precision of data from models of sodium kinetics in hemodialysis].

    Science.gov (United States)

    Ahrenholz, P; Falkenhagen, D; Hähling, D; Klinkmann, H

    1990-08-01

    The 1-pool-model of sodium kinetics during hemodialysis is based upon the assumption of an immediate compensation of osmotic shifts. This assumption is not supported by measurements of plasma sodium, total protein concentration and colloid osmotic pressure kinetics. When a high dialysate sodium concentration is applied, an inflow of sodium into the plasma space occurs, which results in an osmotic suction and thus a plasma dilution. These conditions can be represented by a 2-pool-model taking into consideration capillary filtration. The results indicate that following the first treatment period the sodium kinetics are sufficiently explained by a 1-pool-model with the total body water as distribution volume. Both the plasma sodium concentration and the eliminated sodium at the end of a hemodialysis treatment can be described to an acceptable level by the 1-pool-model. The input of the measured in-vivo sodium dialysance value (or alternatively the urea clearance) is necessary.

  16. The influence of hemodialysis membranes on the plasma insulin level of diabetic patients on maintenance hemodialysis.

    Science.gov (United States)

    Abe, M; Kikuchi, F; Kaizu, K; Matsumoto, K

    2008-05-01

    The aim of the present study was to evaluate the alteration in plasma immunoreactive insulin (IRI) concentrations due to hemodialysis (HD) treatment by using three types of membranes in diabetic HD patients. We recruited 20 outpatients on maintenance HD with diabetes for this crossover study. HD was performed using membranes made of cellulose triacetate (CTA), polyester-polymer alloy (PEPA), and polysulphone (PS). These membranes were used for 2 weeks (6 HD sessions) in each patient in a randomized order decided by drawing lots. Blood samples were obtained at the beginning and end of the HD session from the blood tubing at the arterial (A) site. At 60 min after the initiation of dialysis, blood samples were obtained from the blood tubing at both the A and venous (V) sites of the dialyzer. The plasma IRI levels decreased significantly at the sites an hour after initiating HD in all membranes. The clearance of IRI was significantly higher in the case of the PS membrane when compared with the CTA and PEPA membranes. It was concluded that plasma insulin is cleared by HD, and the rate differs for each membrane. Plasma insulin clearance with the PS membrane is higher than that with the PEPA and CTA membranes.

  17. Standardization in synthetic biology.

    Science.gov (United States)

    Müller, Kristian M; Arndt, Katja M

    2012-01-01

    Synthetic Biology is founded on the idea that complex biological systems are built most effectively when the task is divided in abstracted layers and all required components are readily available and well-described. This requires interdisciplinary collaboration at several levels and a common understanding of the functioning of each component. Standardization of the physical composition and the description of each part is required as well as a controlled vocabulary to aid design and ensure interoperability. Here, we describe standardization initiatives from several disciplines, which can contribute to Synthetic Biology. We provide examples of the concerted standardization efforts of the BioBricks Foundation comprising the request for comments (RFC) and the Registry of Standardized Biological parts as well as the international Genetically Engineered Machine (iGEM) competition.

  18. Direct cost of monitoring conventional hemodialysis conducted by nursing professionals

    OpenAIRE

    Lima, Antônio Fernandes Costa

    2017-01-01

    ABSTRACT Objective: to analyze the mean direct cost of conventional hemodialysis monitored by nursing professionals in three public teaching and research hospitals in the state of São Paulo, Brazil. Method: this was a quantitative, explorative and descriptive investigation, based on a multiple case study approach. The mean direct cost was calculated by multiplying (clocked) time spent per procedure by the unit cost of direct labor. Values were calculated in Brazilian real (BRL). Results: H...

  19. Inadequate doses of hemodialysis. Predisposing factors, causes and prevention

    Directory of Open Access Journals (Sweden)

    Pehuén Fernández

    2017-04-01

    Full Text Available Patients receiving sub-optimal dose of hemodialysis have increased morbidity and mortality. The objectives of this study were to identify predisposing factors and causes of inadequate dialysis, and to design a practical algorithm for the management of these patients. A cross-sectional study was conducted. Ninety patients in chronic hemodialysis at Hospital Privado Universitario de Córdoba were included, during September 2015. Twenty two received sub-optimal dose of hemodialysis. Those with urea distribution volume (V greater than 40 l (72 kg body weight approximately are 11 times more likely (OR = 11.6; CI 95% = 3.2 to 51.7, p < 0.0001 to receive an inadequate dose of hemodialysis, than those with a smaller V. This situation is more frequent in men (OR = 3.5; 95% CI 1.01-15.8; p = 0.0292. V greater than 40 l was the only independent predictor of sub-dialysis in the multivariate analysis (OR = 10.3; 95% CI 2.8-37; p < 0.0004. The main cause of suboptimal dialysis was receiving a lower blood flow (Qb than the prescribed (336.4 ± 45.8 ml/min vs. 402.3 ± 28.8 ml/min respectively, p < 0.0001 (n = 18. Other causes were identified: shorter duration of the session (n = 2, vascular access recirculation (n = 1, and error in the samples (n = 1. In conclusion, the only independent predisposing factor found in this study for sub-optimal dialysis is V greater than 40 l. The main cause was receiving a slower Qb than prescribed. From these findings, an algorithm for the management of these patients was developed

  20. Determinants of training and technique failure in home hemodialysis.

    Science.gov (United States)

    Schachter, Michael E; Tennankore, Karthik K; Chan, Christopher T

    2013-07-01

    Home hemodialysis (HHD) has clinical and economic advantages compared with in-center conventional hemodialysis. Many health systems wish to broaden the population to which this modality can be successfully offered. However, determinants of successful HHD training and technique survival are unknown. We hypothesize that both medical and social factors play a role when patients fail to successfully adopt HHD. We examined characteristics of consecutive patients who initiated training for HHD between 2003 and 2011. Patients were classified as "failure" if they failed to complete HHD training or experienced technique failure (TF) within the first year of treatment. Remaining patients were classified as "success." One hundred seventy-seven patients initiated HHD training. In the "failure" group (n = 32), 24 did not finish training and 8 had TF. In the "success" group (n = 145), 65 (45%) patients remained on NHD, 49 (34%) discontinued HHD because of renal transplantation and 21 (14%) because of death, while only 10 (7%) eventually transferred to another dialysis modality. In a multivariable logistic regression analysis, the strongest predictors of "failure" were end-stage renal disease because of diabetes (odds ratio [OR] 3.8, 95% confidence interval [CI] 1.4-10.3, P = 0.008) and use of rental housing (OR 3.1, 95% CI 1.3-6.0, P = 0.01). Both medical and social factors are associated with failure to adopt HHD. Enhanced supports or a customized education strategy for these vulnerable patients should be considered. © 2013 The Authors. Hemodialysis International © 2013 International Society for Hemodialysis.

  1. Individualized Anemia Management Reduces Hemoglobin Variability in Hemodialysis Patients

    OpenAIRE

    Gaweda, Adam E.; Aronoff, George R.; Jacobs, Alfred A.; Rai, Shesh N.; Brier, Michael E.

    2013-01-01

    One-size-fits-all protocol-based approaches to anemia management with erythropoiesis-stimulating agents (ESAs) may result in undesired patterns of hemoglobin variability. In this single-center, double-blind, randomized controlled trial, we tested the hypothesis that individualized dosing of ESA improves hemoglobin variability over a standard population-based approach. We enrolled 62 hemodialysis patients and followed them over a 12-month period. Patients were randomly assigned to receive ESA ...

  2. Anthropometric Indicators Predict Metabolic Syndrome Diagnosis in Maintenance Hemodialysis Patients.

    Science.gov (United States)

    Vogt, Barbara Perez; Ponce, Daniela; Caramori, Jacqueline Costa Teixeira

    2016-06-01

    Obesity has been considered the key in metabolic syndrome (MetS) development, and fat accumulation may be responsible for the occurrence of metabolic abnormalities in hemodialysis patients. The use of gold-standard methods to evaluate obesity is limited, and anthropometric measures may be the simplest methods. However, no study has investigated the association between anthropometric indexes and MetS in these patients. Therefore, the aim was to determine which anthropometric indexes had the best association and prediction for MetS in patients undergoing hemodialysis. Cross-sectional study that included patients older than 18 years, undergoing hemodialysis for at least 3 months. Patients with liver disease and cancer or those receiving corticosteroids or antiretroviral therapy were excluded. Diagnostic criteria from Harmonizing Metabolic Syndrome were used for the diagnosis of MetS. Anthropometric indexes evaluated were body mass index (BMI); percent standard of triceps skinfold thickness and of middle arm muscle circumference; waist circumference (WC); sagittal abdominal diameter; neck circumference; waist-to-hip, waist-to-thigh, and waist-to-height ratios; sagittal index; conicity index; and body fat percentage. Ninety-eight patients were included, 54.1% male, and mean age was 57.8 ± 12.9 years. The prevalence of MetS was 74.5%. Individuals with MetS had increased accumulation of abdominal fat and general obesity. Waist-to-height ratio was the variable independently associated with MetS diagnosis (odds ratio, 1.21; 95% confidence interval, 1.09-1.34; P < .01) and that better predicts MetS, followed by WC and BMI (area under the curve of 0.840, 0.836, and 0.798, respectively, P < .01). Waist-to-height ratio was the best anthropometric predictor of MetS in maintenance hemodialysis patients. © 2015 American Society for Parenteral and Enteral Nutrition.

  3. Profiling Total Viable Bacteria in a Hemodialysis Water Treatment System.

    Science.gov (United States)

    Chen, Lihua; Zhu, Xuan; Zhang, Menglu; Wang, Yuxin; Lv, Tianyu; Zhang, Shenghua; Yu, Xin

    2017-05-28

    Culture-dependent methods, such as heterotrophic plate counting (HPC), are usually applied to evaluate the bacteriological quality of hemodialysis water. However, these methods cannot detect the uncultured or viable but non-culturable (VBNC) bacteria, both of which may be quantitatively predominant throughout the hemodialysis water treatment system. Therefore, propidium monoazide (PMA)-qPCR associated with HPC was used together to profile the distribution of the total viable bacteria in such a system. Moreover, high-throughput sequencing of 16S rRNA gene amplicons was utilized to analyze the microbial community structure and diversity. The HPC results indicated that the total bacterial counts conformed to the standards, yet the bacteria amounts were abruptly enhanced after carbon filter treatment. Nevertheless, the bacterial counts detected by PMA-qPCR, with the highest levels of 2.14 × 10 7 copies/100 ml in softener water, were much higher than the corresponding HPC results, which demonstrated the occurrence of numerous uncultured or VBNC bacteria among the entire system before reverse osmosis (RO). In addition, the microbial community structure was very different and the diversity was enhanced after the carbon filter. Although the diversity was minimized after RO treatment, pathogens such as Escherichia could still be detected in the RO effluent. In general, both the amounts of bacteria and the complexity of microbial community in the hemodialysis water treatment system revealed by molecular approaches were much higher than by traditional method. These results suggested the higher health risk potential for hemodialysis patients from the up-to-standard water. The treatment process could also be optimized, based on the results of this study.

  4. Hemodialysis catheter-related infection: rates, risk factors and pathogens.

    Science.gov (United States)

    Sahli, Farida; Feidjel, Razika; Laalaoui, Rima

    The main complication of central venous catheter (CVC) in hemodialysis is infection. Identifying CVC related infection (CVC-RI) risk factors and causative micro-organisms is important for setting prevention policies. There were no data regarding CVC-RI in hemodialysis in Algeria. To determine rates of CVC-RI in hemodialysis in Setif university hospital, risk factors and causative microorganisms, we conducted a prospective study from November 2014 to May 2015 involving patients with CVC in hemodialysis. Micro-organisms isolated from semi quantitative culture of CVC and blood culture were identified and tested for antibiotic susceptibility using the automated MicroScan system (DADE Behring, Sacramento, CA, USA). Chi-square test was performed to compare demographic and clinical variables (age, sex, comorbidities, duration of CVC, insertion site) in the groups of patients with and without CVC-RI. P<0.05 was considered statistically significant. All analyses were performed using SPSS V17 for Windows statistical package (SPSS Inc., Chicago, IL, USA). 94 patients and 152 CVC procedures were analyzed. 34 CVC-RI were documented with an incidence of 16.6 per 1000 CVC-days. Incidence of CVC related bloodstream infection (CVC-RBI) was 10.8 per 1000 CVC-days. Independent risk factors associated with CVC-RI were diabetes (P=0.01) and duration of catheterization (P= 0.01). Causative micro-organisms were: Klebsiella pneumoniae 26.5%, coagulase-negative staphylococci 23.5% and Staphylococcus aureus 23.5%. Micro-organisms were multidrug-resistant (MDR). Mortality was statistically associated to inadequate antibiotic therapy. The duration of CVC should be reduced by creation of fistulas. More compliance to hygiene measure is needed for decreasing CVC-RI and resistance rate. Copyright © 2016 King Saud Bin Abdulaziz University for Health Sciences. Published by Elsevier Ltd. All rights reserved.

  5. Psychosocial status of hemodialysis patients one year after Hurricane Katrina.

    Science.gov (United States)

    Hyre, Amanda D; Cohen, Andrew J; Kutner, Nancy; Alper, Arnold B; Dreisbach, Albert W; Kimmel, Paul L; Muntner, Paul

    2008-08-01

    Hemodialysis patients experience a high degree of psychosocial impairment. The psychosocial status of hemodialysis patients after Hurricane Katrina was evaluated using the Hurricane Coping Self-Efficacy (HCSE) measure, the Short Form-12 Health Survey (physical component summary [PCS] and mental component summary [MCS]), and the Center for Epidemiologic Studies Short Depression Scale (CES-D). These scales were administered to 391 hemodialysis patients (86% participation rate), 7 to 14 months after Hurricane Katrina. The mean score (standard deviation) was 36.2 (9.6) for the HCSE scale, 37.1 (10.9) and 46.7 (12.7) for the PCS and MCS, respectively, and 10.0 (6.5) on the CES-D. Symptoms of depression (CES-D scores > or =10) were present in 45.5% of patients. After age, race, and gender adjustment, evacuating less than 2 days before Hurricane Katrina making landfall and more fear of dying were associated with less favorable scores on the HCSE, MCS, and CES-D scales. Patients placed in a shelter and with a longer displacement had significantly lower MCS scores and more depressive symptoms. More depressive symptoms were observed among patients hospitalized in the month after the storm. Those who evacuated to a hotel, with more fear of dying and who were hospitalized in the month after Hurricane Katrina had lower scores on the PCS. Impaired psychosocial status was common among dialysis patients surviving Hurricane Katrina and associated with reduced coping. These data demonstrate the need for screening and management of psychosocial issues in hemodialysis patients after disasters.

  6. Skin autofluorescence predicts cardiovascular mortality in patients on chronic hemodialysis.

    Science.gov (United States)

    Kimura, Hiroshi; Tanaka, Kenichi; Kanno, Makoto; Watanabe, Kimio; Hayashi, Yoshimitsu; Asahi, Koichi; Suzuki, Hodaka; Sato, Keiji; Sakaue, Michiaki; Terawaki, Hiroyuki; Nakayama, Masaaki; Miyata, Toshio; Watanabe, Tsuyoshi

    2014-10-01

    Tissue accumulation of advanced glycation end products (AGE) is thought to contribute to the progression of cardiovascular disease (CVD). Skin autofluorescence, a non-invasive measure of AGE accumulation using autofluorescence of the skin under ultraviolet light, has been reported to be an independent predictor of mortality associated with CVD in Caucasian patients on chronic hemodialysis. The aim of this study was to assess the predictive value of skin autofluorescence on all-cause and cardiovascular mortality in non-Caucasian (Japanese) patients on chronic hemodialysis. Baseline skin autofluorescence was measured with an autofluorescence reader in 128 non-Caucasian (Japanese) patients on chronic hemodialysis. All-cause and cardiovascular mortality was monitored prospectively during a period of 6 years. During the follow-up period, 42 of the 128 patients died; 19 of those patients died of CVD. Skin autofluorescence did not have a significant effect on all-cause mortality. However, age, carotid artery intima-media thickness (IMT), serum albumin, high-sensitivity C-reactive protein (hsCRP), skin autofluorescence and pre-existing CVD were significantly correlated with cardiovascular mortality. Multivariate Cox regression analysis showed skin autofluorescence (adjusted hazard ratio [HR] 3.97; 95% confidence interval [CI]1.67-9.43), serum albumin (adjusted HR 0.05; 95% CI 0.01-0.32), and hsCRP (adjusted HR 1.55; 95% CI 1.18-2.05) to be independent predictors of cardiovascular mortality. The present study suggests that skin autofluorescence is an independent predictor of cardiovascular mortality in non-Caucasian (Japanese) patients on chronic hemodialysis. © 2014 The Authors. Therapeutic Apheresis and Dialysis © 2014 International Society for Apheresis.

  7. The impact of hemodialysis on erythrocyte membrane cytoskeleton proteins

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    Maria Olszewska

    2015-02-01

    Full Text Available Background: Hemodialysis (HD is one of the methods of renal replacement therapy, but it also contributes to an increase in oxidative stress. Hemodialysis leads to changes in the erythrocyte cytoskeleton structure, whilst the presence of glucose in the dialysis fluid which activates the pentose phosphate pathway contributes to the intensification of oxidative stress. Available literature lacks reports on the effect of glucose in the dialytic fluid on the composition of proteins of the cell membrane cytoskeleton.Material/Methods: Red blood cells for this analysis were collected from patients with chronic renal failure treated with hemodialysis using both glucose-containing and glucose-free dialysis fluid. Following the preparation of membranes, the electrophoretic separation of proteins was performed in denaturing conditions according to Laemmli. The level of tryptophan in membranes was determined by spectrofluorimetry, whilst the activity of glucose-6-phosphate dehydrogenase was determined by measuring the reduction of oxidated NADP.Results: Hemodialysis in both groups of patients resulted in a statistically significant reduction of tryptophan as an oxidative stress indicator when compared to the control group. Moreover, the activity of glucose-6-phosphate dehydrogenase in the group of patients was higher than in the control group, and following the HD procedure it decreased, which may have been caused by a reduced concentration of dialyzed glucose. The HD procedure affects the structure of the erythrocyte membrane cytoskeleton, which is reflected in the concentration changes in individual proteins and in their mutual relationships corresponding to vertical and horizontal interactions stabilizing the structure of the erythrocyte membrane cytoskeleton. These changes may contribute to the shortening of cell lifespan.

  8. Outcomes of Chronic Hemodialysis Patients in the Intensive Care Unit

    OpenAIRE

    Chan, Melanie; Ostermann, Marlies

    2013-01-01

    Patients with end-stage renal disease (ESRD) experience higher rates of hospitalisation, cardiovascular events, and all-cause mortality and are more likely to require admission to the intensive care unit (ICU) than patients with normal renal function. Sepsis and cardiovascular diseases are the most common reasons for ICU admission. ICU mortality rates in patients requiring chronic hemodialysis are significantly higher than for patients without ESRD; however, dialysis patients have a better I...

  9. Radiochemical grafting of acryonitrile on polystyrene

    International Nuclear Information System (INIS)

    Jendrychowska-Bonamour, A.M.; Michot, C.

    1977-01-01

    Polystyrene polyacrylonitrile copolymers have been prepared by the direct radio-induced grafting method. The reaction has been carried out in a gel of polystyrene swollen by the monomer. The ungrafted polystyrene has been extracted by toluene. It has been possible to separate grafted copolymers from homopolymer traces, despite the very strong dipole-dipole interactions exhibited in solution between polyacrylonitrile chains; afterwards these grafted copolymers were fractionated by composition. The limits of solubility and the glass transition temperatures of the grafted copolymers have been determined. The properties of grafted copolymers have been compared with those of block polyacrylonitrile copolymers. (authors)

  10. Homogeneous cation exchange membrane by radiation grafting

    International Nuclear Information System (INIS)

    Kolhe, Shailesh M.; G, Agathian; Ashok Kumar

    2001-01-01

    Preparation of a strong cation exchange membrane by radiation grafting of styrene on to polyethylene (LDPE) film by mutual irradiation technique in the presence of air followed by sulfonation is described. The grafting has been carried out in the presence of air and without any additive. Low dose rate has been seen to facilitate the grafting. Further higher the grafting percentage more is the exchange capacity. The addition of a swelling agent during the sulfonation helped in achieving the high exchange capacity. The TGA-MASS analysis confirmed the grafting and the sulfonation. (author)

  11. Serum alanine aminotransferase levels, hematocrit rate and body weight correlations before and after hemodialysis session

    Directory of Open Access Journals (Sweden)

    Edmundo Pessoa Lopes

    2009-01-01

    Full Text Available PURPOSE: To evaluate alanine aminotransferase levels before and after a hemodialysis session and to correlate these values with the hematocrit rate and weight loss during hemodialysis. PATIENTS AND METHODS: The serum alanine aminotransferase levels, hematocrit rate and body weight were measured and correlated before and after a single hemodialysis session for 146 patients with chronic renal failure. An receiver operating characteristic (ROC curve for the serum alanine aminotransferase levels collected before and after hemodialysis was plotted to identify hepatitis C virus-infected patients. RESULTS: The mean weight loss of the 146 patients during hemodialysis was 5.3% (p < 0.001. The mean alanine aminotransferase levels before and after hemodialysis were 18.8 and 23.9 IU/, respectively, denoting a significant 28.1% increase. An equally significant increase of 16.4% in the hematocrit rate also occurred after hemodialysis. The weight loss was inversely correlated with the rise in both the alanine aminotransferase level (r = 0.3; p < 0.001 and hematocrit rate (r = 0.5; p < 0.001. A direct correlation was found between the rise in alanine aminotransferase levels and the hematocrit during the hemodialysis session (r = 0.4; p < 0.001. Based on the ROC curve, the upper limit of the normal alanine aminotransferase level should be reduced by 40% relative to the upper limit of normal if the blood samples are collected before the hemodialysis session or by 60% if blood samples are collected after the session. CONCLUSION: In the present study, significant elevations in the serum alanine aminotransferase levels and hematocrit rates occurred in parallel to a reduction in body weight after the hemodialysis session. These findings suggest that one of the factors for low alanine aminotransferase levels prior to hemodialysis could be hemodilution in patients with chronic renal failure.

  12. The Relations Between Levels of Cadmium and Thyroid Parameters in Hemodialysis Patients

    Directory of Open Access Journals (Sweden)

    Abdullah Sivrikaya

    2013-01-01

    Full Text Available Aim: The aim of the present study is to determine whether there are statistically differences between hemodialysis patients and control (healthy groups according to level of serum cadmium (Cd, total triiodothyronine (T3 and total thyroxine (T4 and adrenocorticotropin hormone (ACTH, and besides whether there are any correlation coefficients of trace element with thyroid profiles, ACTH in these groups. Material and Methods:The study included 47 hemodialysis patient who were dialyzed three times a week and each session was at least 4 hours. The duration of dialysis range were 2-16 yr. This group called as a “Hemodialyis group”. Blood samples were taken before (pre-hemodialysis and after (post-hemodialysis hemodialysis session. “Control group” included 23 healthy volunteers with no medical problem. In control group, samples were taken after 10 hour fasting. Results: Levels of total T3 were higher in group of control than the levels of pre-hemodialysis and post-hemodialysis (p≤0.001. Total T3 levels were lower in pre-hemodialysis (p≤0.05 than those of post-hemodialysis. The highest level of total T4 and lowest level of Cd were in control group and these parameters were statistically different from the pre-hemodialysis (respectively p≤0.001, p≤0.01. We did not determine any significant differences between all groups according to data of ACTH levels. Discussion: We suggest that analyzing the levels of Cd may be useful for the hemodialysis patients. But, we did not determine a significant association between Cd and thyroid profiles and ACTH levels.

  13. Optical synthetic aperture radar

    Science.gov (United States)

    Ilovitsh, Asaf; Zach, Shlomo; Zalevsky, Zeev

    2013-06-01

    A method is proposed for increasing the resolution of an object and overcoming the diffraction limit of an optical system installed on top of a moving imaging system, such as an airborne platform or satellite. The resolution improvement is obtained via a two-step process. First, three low resolution differently defocused images are captured and the optical phase is retrieved using an improved iterative Gershberg-Saxton based algorithm. The phase retrieval allows numerical back propagation of the field to the aperture plane. Second, the imaging system is shifted and the first step is repeated. The obtained optical fields at the aperture plane are combined and a synthetically increased lens aperture is generated along the direction of movement, yielding higher imaging resolution. The method resembles a well-known approach from the microwave regime called the synthetic aperture radar in which the antenna size is synthetically increased along the platform propagation direction. The proposed method is demonstrated via Matlab simulation as well as through laboratory experiment.

  14. Cellulose Modification Through Grafting of Polyacrylonitrile by Atom Transfer Radical Polymerization

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    Mojtaba Abbasian

    2015-09-01

    Full Text Available In addition to properties such as biocompatibility and biodegradability, cellulosic natural fibers have a higher strength property than the synthetic polymers and glass fibers. So they are suitable alternatives to synthetic and glass fibers. However, cellulose is highly hydrophilic and has low reactivity. Therefore, its industrial applications are limited. To overcome such drawbacks, the chemical modification of the cellulose structure is necessary. Graft copolymerization, a commonly used method for the modification of polymer surfaces, can be applied as an important tool for modifying the physical or chemical properties of polymers. By grafting hydrophobic polymer chains onto the cellulose fiber surface, the hydrophilicity of the cellulose can be altered. In this project, polyacrylonitrile was grafted onto cellulose surface by atom transfer radical polymerization (ATRP technique. In the first step, the reaction of OH cellulosic groups with acryloyl chloride in the LiBr/N,N-dimethyl acetamide mixture was carried out to form pendant double bonds and yield water soluble cellulose acrylate. Then, 4-chloromethyl styrene in the presence of toluene was grafted onto the unsaturated group via free radical polymerization and using azobisisobutyronitrile as the initiator. Finally, the synthesized cellulose-graft-polychloromethyl styrene having a transferable atom (Cl for the polymerization of acrylonitrile in THF and in the presence of copper (I chloride /2,2’-bipyridine as a catalyst system was used as an ATRP macroinitiator to prepare the cellulose-graft-polychloromethylstyrene-graftpolyacrylonitrile terpolymer. The products were characterized by scanning electron microscopy, X-ray diffraction and FTIR spectroscopy and their thermal stability was investigated by the thermogravimetric analysis and differential scanning calorimetry.

  15. Effect of hemodialysis on intraocular lens power calculation.

    Science.gov (United States)

    Çalışkan, Sinan; Çelikay, Osman; Biçer, Tolga; Aylı, Mehmet Deniz; Gürdal, Canan

    2016-01-01

    To evaluate changes in ocular biometric parameters after hemodialysis (HD) in patients with end-stage renal disease (ESRD). Forty eyes of 40 patients undergoing HD were included in this cross-sectional study. Keratometry (K) readings, white-to-white (WTW) distance, central corneal thickness (CCT), anterior chamber depth (ACD), pupil diameter, lens thickness (LT), axial length (AL), and intraocular lens (IOL) power calculation were measured with Lenstar LS 900 (Haag Streit AG, Koeniz, Switzerland) before and after hemodialysis. Intraocular pressure (IOP) was measured with a non-contact tonometer (Tonopachy NT-530P, Nidek Co., LTD, Tokyo, Japan). Main outcomes were changes in biometric parameters after HD. Reliability of the measurements (intraclass correlation coefficients (ICCs)) and the effect size (Cohen's d) were also calculated. Mean difference in AL before and after HD was -0.041 ± 0.022 mm with ICCs > 0.90 (p  0.90 (p = 0.041 and Cohen's d = 0.20). Hemodialysis had no significant effect on K readings, WTW distance, CCT, ACD, LT, or IOP. Axial length and pupil diameter increase after HD with small effect size, while HD does not significantly affect IOL power calculations.

  16. Continous venovenous hemodialysis (CVVHD: Report of 3 cases

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    Seirafian Sh

    1998-07-01

    Full Text Available Some of ICU patients with Acute Renal Failure (ARF require dialysis. Conventional or intermittent hemodialysis (HD may cause hypotension and insufficient loss of fluids and toxins from blood. Peritoneal dialysis also my cause peritonitis and has lower efficiency than HD. We did continuous Venovenous Hemodialysis (CVVHD for three ICU patients with ARF in Saint-Zahra Medical Center for the first time in our country. Method and Material: With a polysulfone membrane, blood pump, peritoneal dialysis solution, heparin, and a fix nurse, HD was done for 12-24 hours. Results: 1 Urea clearance was 18-50 ml/h. 2 Ultrafiltration was 160-1000 ml/h. 3 With dialysis, hemorrhage, coagulation disorder, and oxygenation recovered. 4 All of patients developed hyperglycemia and hypothermia. 5 All of patients died (two with septicemia and one with hypotension. Conclusion: In the absence of hemodialysis or peritoneal dialysis, CVVHD with present preliminary equipments is suitable and can excrete more toxins and fluids.

  17. The Adequacy of Phosphorus Binder Prescriptions Among American Hemodialysis Patients

    Science.gov (United States)

    Huml, Anne M.; Sullivan, Catherine M.; Leon, Janeen B.; Sehgal, Ashwini R.

    2013-01-01

    Because hemodialysis treatment has a limited ability to remove phosphorus, dialysis patients must restrict dietary phosphorus intake and use phosphorus binding medication. Among patients with restricted dietary phosphorus intake (1000 mg/d), phosphorus binders must bind about 250 mg of excess phosphorus per day and among patients with more typical phosphorus intake (1500 mg/d), binders must bind about 750 mg per day. To determine the phosphorus binding capacity of binder prescriptions among American hemodialysis patients, we undertook a cross-sectional study of a random sample of in-center chronic hemodialysis patients. We obtained data for one randomly selected patient from 244 facilities nationwide. About one-third of patients had hyperphosphatemia (serum phosphorus level > 5.5 mg/dL). Among the 224 patients prescribed binders, the mean phosphorus binding capacity was 256 mg/d (SD 143). 59% of prescriptions had insufficient binding capacity for restricted dietary phosphorus intake, and 100% had insufficient binding capacity for typical dietary phosphorus intake. Patients using two binders had a higher binding capacity than patients using one binder (451 vs. 236 mg/d, p phosphorus balance. Use of two binders results in higher binder capacity. Further work is needed to understand the impact of binder prescriptions on mineral balance and metabolism and to determine the value of substantially increasing binder prescriptions. PMID:23013171

  18. Hemodialysis Catheter Heat Transfer for Biofilm Prevention and Treatment.

    Science.gov (United States)

    Richardson, Ian P; Sturtevant, Rachael; Heung, Michael; Solomon, Michael J; Younger, John G; VanEpps, J Scott

    2016-01-01

    Central line-associated bloodstream infections (CLABSIs) are not easily treated, and many catheters (e.g., hemodialysis catheters) are not easily replaced. Biofilms (the source of infection) on catheter surfaces are notoriously difficult to eradicate. We have recently demonstrated that modest elevations of temperature lead to increased staphylococcal susceptibility to vancomycin and significantly soften the biofilm matrix. In this study, using a combination of microbiological, computational, and experimental studies, we demonstrate the efficacy, feasibility, and safety of using heat as an adjuvant treatment for infected hemodialysis catheters. Specifically, we show that treating with heat in the presence of antibiotics led to additive killing of Staphylococcus epidermidis with similar trends seen for Staphylococcus aureus and Klebsiella pneumoniae. The magnitude of temperature elevation required is relatively modest (45-50°C) and similar to that used as an adjuvant to traditional cancer therapy. Using a custom-designed benchtop model of a hemodialysis catheter, positioned with tip in the human vena cava as well as computational fluid dynamic simulations, we demonstrate that these temperature elevations are likely achievable in situ with minimal increased in overall blood temperature.

  19. Hemodialysis Clinic Social Networks, Sex Differences, and Renal Transplantation.

    Science.gov (United States)

    Gillespie, A; Fink, E L; Traino, H M; Uversky, A; Bass, S B; Greener, J; Hunt, J; Browne, T; Hammer, H; Reese, P P; Obradovic, Z

    2017-09-01

    This study describes patient social networks within a new hemodialysis clinic and models the association between social network participation and kidney transplantation. Survey and observational data collected between August 2012 and February 2015 were used to observe the formation of a social network of 46 hemodialysis patients in a newly opened clinic. Thirty-two (70%) patients formed a social network, discussing health (59%) and transplantation (44%) with other patients. While transplant-eligible women participated in the network less often than men (56% vs. 90%, p = 0.02), women who participated discussed their health more often than men (90% vs. 45.5%, p = 0.02). Patients in the social network completed a median of two steps toward transplantation compared with a median of 0 for socially isolated patients (p = 0.003). Patients also completed more steps if network members were closely connected (β = 2.23, 95% confidence interval [CI] 0.16-4.29, p = 0.03) and if network members themselves completed more steps (β = 2.84, 95% CI 0.11-5.57, p = 0.04). The hemodialysis clinic patient social network had a net positive effect on completion of transplant steps, and patients who interacted with each other completed a similar number of steps. © 2017 The American Society of Transplantation and the American Society of Transplant Surgeons.

  20. THE ASSESSMENT OF CAREGIVER BURDEN IN CAREGIVERS OF HEMODIALYSIS PATIENTS.

    Science.gov (United States)

    Mashayekhi, Fatemeh; Pilevarzadeh, Motahareh; Rafati, Foozieh

    2015-10-01

    Chronic renal failure is among the chronic disease which due to persistence of the disease and long treatment process has various effects on the physiological, psychological, functional ability, lifestyle changes, and independence status of the patient and his family. This may result in the burden feeling in caregivers. According to the importance of the subject, this study is to assess the level of caregiver burden in caregivers of hemodialysis patients. This is a cross-sectional analytical descriptive study that was conducted in 2014 on the caregivers of hemodialysis patients. Research instruments were consisted of two parts: demographic data check list and caregiver burden questionnaire. Data were analyzed by SPSS statistical software and Pearson correlation coefficient tests. A p value of less than 0.05 was considered statistically significant. In this study, 72.5% of caregivers reported moderate to severe levels of caregiver burden. A significant relationship was observed between gender of the patient with caregiver burden score of (p=0.031) and type of the income with caregiver burden score of (p=0.000). Caregivers of male patients and patients with inadequate income had a higher caregiver burden score. Our results showed that more than half of the caregivers of hemodialysis patients had moderate to severe levels of caregiver burden, therefore it is worthy that health officials and nurses pay special attention to this issue by communicating with these patients and their caregivers.

  1. Bath salt intoxication causing acute kidney injury requiring hemodialysis.

    Science.gov (United States)

    Regunath, Hariharan; Ariyamuthu, Venkatesh Kumar; Dalal, Pranavkumar; Misra, Madhukar

    2012-10-01

    Traditional bath salts contain a combination of inorganic salts like Epsom salts, table salt, baking soda, sodium metaphosphate, and borax that have cleansing properties. Since 2010, there have been rising concerns about a new type of substance abuse in the name of "bath salts." They are beta-ketone amphetamine analogs and are derivates of cathinone, a naturally occurring amphetamine analog found in the "khat" plant (Catha edulis). Effects reported with intake included increased energy, empathy, openness, and increased libido. Serious adverse effects reported with intoxication included cardiac, psychiatric, and neurological signs and symptoms. Not much is known about the toxicology and metabolism of these compounds. They inhibit monoamine reuptake (dopamine, nor epinephrine, etc.) and act as central nervous system stimulants with high additive and abuse potential because of their clinical and biochemical similarities to effects from use of cocaine, amphetamine, and 3,4-methylenedioxy-N-methylamphetamine. Deaths associated with use of these compounds have also been reported. We report a case of acute kidney injury associated with the use of "bath salt" pills that improved with hemodialysis. © 2012 The Authors. Hemodialysis International © 2012 International Society for Hemodialysis.

  2. Intermittent hemodialysis in dogs with chronic kidney disease stage III

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    Alessandra Melchert

    2017-08-01

    Full Text Available ABSTRACT: Intermittent hemodialysis (IHD is a form of renal replacement that is used in veterinary medicine for cases involving drug removal, electrolyte imbalance, acute kidney injury, and chronic kidney disease (CKD. The aim of the present study was to verify the efficacy of IHD in dogs with CKD staged at grade III and to evaluate the effect of IHD on quality of life. Twelve dogs with CKD at stage III met the inclusion criteria and were divided equally into two groups. The control group (n=6 received only clinical treatment and intravenous fluid therapy, and the hemodialysis group (n=6 received clinical and IHD treatments. Blood samples were collected before and after treatments in both groups. We evaluated complications and clinical parameters of IHD every 30 minutes. Hemodialysis decreased serum urea, creatinine, and phosphorus. Despite the evident removal of nitrogen compounds, dialysis treatment did not increase survival time in these patients. The results of this study do not support the early use of dialysis in dogs with chronic kidney disease stage III.

  3. Maintenance hemodialysis patients have high cumulative radiation exposure.

    LENUS (Irish Health Repository)

    Kinsella, Sinead M

    2010-10-01

    Hemodialysis is associated with an increased risk of neoplasms which may result, at least in part, from exposure to ionizing radiation associated with frequent radiographic procedures. In order to estimate the average radiation exposure of those on hemodialysis, we conducted a retrospective study of 100 patients in a university-based dialysis unit followed for a median of 3.4 years. The number and type of radiological procedures were obtained from a central radiology database, and the cumulative effective radiation dose was calculated using standardized, procedure-specific radiation levels. The median annual radiation dose was 6.9 millisieverts (mSv) per patient-year. However, 14 patients had an annual cumulative effective radiation dose over 20 mSv, the upper averaged annual limit for occupational exposure. The median total cumulative effective radiation dose per patient over the study period was 21.7 mSv, in which 13 patients had a total cumulative effective radiation dose over 75 mSv, a value reported to be associated with a 7% increased risk of cancer-related mortality. Two-thirds of the total cumulative effective radiation dose was due to CT scanning. The average radiation exposure was significantly associated with the cause of end-stage renal disease, history of ischemic heart disease, transplant waitlist status, number of in-patient hospital days over follow-up, and death during the study period. These results highlight the substantial exposure to ionizing radiation in hemodialysis patients.

  4. Prevalence of malnutrition and associated factors in hemodialysis patients

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    Ana Tereza Vaz de Souza Freitas

    2014-06-01

    Full Text Available OBJECTIVE: To assess the prevalence of malnutrition and associated factors in hemodialysis patients. METHODS: This is a cross-sectional study of 344 hemodialysis patients from Goiânia, Goiás aged 18 years or more. The dependent variable, malnutrition, was investigated by the Subjective Global Assessment. The independent variables included socioeconomic, demographic, and lifestyle data, clinical history, and energy and protein intakes. The patients underwent anthropometric measurements and laboratory tests. Multiple Poisson regression determined the associated factors (p60 months (PR=1.08, 95%CI=1.01-1.16, Kt/V>1.2 (RP=1.12, 95%CI=1.03-1.22, calorie intake <35 kcal/kg/day (PR=1.22, 95%CI=1.10-1.34, and normalized protein nitrogen appearance <1.0 g/kg/day (PR=1.13, 95%CI=1.05-1.21. CONCLUSION: The prevalence of malnutrition in this population was high, corroborating the literature. The prevalence was higher in patients aged less than 29 years and those with low family income, longer hemodialysis vintage, higher Kt/V, and inadequate protein and calorie intakes. Strategies to reverse this situation should include more nutritional care.

  5. Treatment of lethal acetylsalicylic acid poisoning without hemodialysis.

    Science.gov (United States)

    Ueno, Masahito; Oda, Jun; Soeda, Hiroshi; Uesugi, Hirotaka; Ueno, Keiko; Fujise, Yo; Yukioka, Tetsuo

    2015-04-01

    A woman aged in her 20s ingested approximately 99 g acetylsalicylic acid, and was transported to our hospital 2 h later. She was lucid, but complained of hearing loss and tinnitus. We performed gastric lavage and gave her activated charcoal several times. We attempted to maintain the urinary pH at 7.5 and output above 100 mL/h while preparing for urgent hemodialysis. It was revealed after discharge that the blood concentration of acetylsalicylic acid was 103.8 mg/dL on admission (lethal dose level) and had decreased to 35.4 mg/dL by the next morning. The half-life was 8.5 h. Hemodialysis is strongly recommended for patients who take a lethal dose of acetylsalicylic acid. However, by carefully evaluating the vital signs and urinary output and pH, while preparing for emergency hemodialysis, we consider that it is possible to treat acetylsalicylic acid poisoning by alkaline diuresis and critical supportive care.

  6. Prevalence of Secondary Hyper Parathyroidism in Hemodialysis Patients

    Directory of Open Access Journals (Sweden)

    F Behzad

    2007-04-01

    Full Text Available Introduction: Osteodystrophy is one of the long term complications of chronic renal failure and is expressed in two forms;low turn over and high turn over. It is an important cause of morbidity in patients with renal failure and if diagnosed and managed properly, many problems of these patients can be resolved. In this study we evaluated the prevalence of hyperparathyroidism in hemodialysis patients and its correlation with different factors. Methods: This study was an analytic, observational study that was done by the cross- sectional method. We formatted a questionnaire for hemodialysis patients who were enrolled in the study over a period of 6 months. Fasting blood samples (5-10c.c were drawn to measure levels of PTH(parathyroid hormone ,calcium, phosphorous and alkaline phosphatase. Skull and wrist X-rays were also taken and the radiologist evaluated them with regards to hyperparathyroidism. Results: In the 80 patients studied, prevalence of hyperparathyroidism was 45% (36 patients. 44 patients were diabetics. Among different factors, hyperparathyroidism did not correlate with frequency and duration of dialysis, age, sex ,familial history, diabetes, hypertension , bone pains, muscle weakness, purities and level of calcium and phosphorous. But there was a significant relationship between hyperparathyroidism and alkaline phosphatase levels and radiological findings. Conclusion: We can use alkaline phosphatase levels and/or radiographic changes for evaluation of renal osteodystrophy in hemodialysis patients and prevent complications by early diagnosis and proper management.

  7. Bone Marrow Pathology Predicts Mortality in Chronic Hemodialysis Patients

    Directory of Open Access Journals (Sweden)

    Cheng-Hao Weng

    2015-01-01

    Full Text Available Introduction. A bone marrow biopsy is a useful procedure for the diagnosis and staging of various hematologic and systemic diseases. The objective of this study was to investigate whether the findings of bone marrow studies can predict mortality in chronic hemodialysis patients. Methods. Seventy-eight end-stage renal disease patients on maintenance hemodialysis underwent bone marrow biopsies between 2000 and 2011, with the most common indication being unexplained anemia followed by unexplained leukocytosis and leukopenia. Results. The survivors had a higher incidence of abnormal megakaryocyte distribution P=0.001, band and segmented cells P=0.021, and lymphoid cells P=0.029 than the nonsurvivors. The overall mortality rate was 38.5% (30/78, and the most common cause of mortality was sepsis (83.3% followed by respiratory failure (10%. In multivariate Cox regression analysis, both decreased (OR 3.714, 95% CI 1.671–8.253, P=0.001 and absent (OR 9.751, 95% CI 2.030–45.115, P=0.004 megakaryocyte distribution (normal megakaryocyte distribution as the reference group, as well as myeloid/erythroid ratio (OR 1.054, CI 1.012–1.098, P=0.011, were predictive of mortality. Conclusion. The results of a bone marrow biopsy can be used to assess the pathology, and, in addition, myeloid/erythroid ratio and abnormal megakaryocyte distribution can predict mortality in chronic hemodialysis patients.

  8. High Hydrostatic Pressure for Disinfection of Bone Grafts and Biomaterials: An Experimental Study

    OpenAIRE

    Gollwitzer, Hans; Mittelmeier, Wolfram; Brendle, Monika; Weber, Patrick; Miethke, Thomas; Hofmann, Gunther O; Gerdesmeyer, Ludger; Schauwecker, Johannes; Diehl, Peter

    2009-01-01

    Background: Autoclaving, heat, irradiation or chemical detergents are used to disinfect autografts, allografts and biomaterials for tissue reconstruction. These methods are often associated with deterioration of mechanical, physical, and biological properties of the bone grafts and synthetic implants. High hydrostatic pressure has been proposed as a novel method preserving biomechanical and biological properties of bone, tendon and cartilage. This is the first study to assess the inactivation...

  9. Dynamics of bone graft healing around implants

    Directory of Open Access Journals (Sweden)

    Narayan Venkataraman

    2015-01-01

    A few questions arise pertaining to the use of bone grafts along with implants are whether these are successful in approximation with implant. Do they accelerate bone regeneration? Are all defects ultimately regenerated with new viable bone? Is the bone graft completely resorbed or integrated in new bone? Does the implant surface characteristic positively affect osseointegration when used with a bone graft? What type of graft and implant surface can be used that will have a positive effect on the healing type and time? Finally, what are the dynamics of bone graft healing around an implant? This review discusses the cellular and molecular mechanisms of bone graft healing in general and in vicinity of another foreign, avascular body, namely the implant surface, and further, the role of bone grafts in osseointegration and/or clinical success of the implants.

  10. Differences in quality of life between Jewish and Arab patients on hemodialysis.

    Science.gov (United States)

    Romano-Zelekha, Orly; Golan, Eliezer; Ifrah, Anneke; Weinstein, Talia; Shohat, Tamy

    2017-12-01

    Higher health-related quality of life (HRQOL) in dialysis patients has been associated with fewer hospitalizations and lower mortality. Since Arab patients on dialysis have better survival rates than Jewish patients, we hypothesized that they would have higher HRQOL. We also studied the impact of several risk factors on HRQOL in each population. Based on a national dialysis registry, patients from 64 hemodialysis units were recruited to participate. Patients who consented were interviewed face-to-face, using the Kidney Disease Quality of Life Short Form (KDQOL-SF36) questionnaire. Five hundred and fifty-eight (50.6%) Jewish and 544 (49.4%) Arab patients participated in the study. For Arab patients mean crude scores for the "mental component summary" and KDQOL scores were significantly lower than for Jewish patients [31.6 (95% Cl 30.0-33.3) vs. 38.0 (95% Cl 36.1-39.9), p Arabs in the "emotional role" and "work status" subscales. The two populations had similar general health assessments and albumin level. For both, HRQOL was positively associated with higher educational level, higher albumin level, and dialysis connection by fistula or graft; and negatively associated with low income and diabetes. HRQOL was negatively associated with previous cerebrovascular accident among Arabs and with female gender among Jews. Differences between Jews and Arabs in subscales related to psychosocial factors suggest that cultural differences in the perceptions of sickness and health may be relevant here. Future studies should explore such possibility and focus on the large gap in the "work status" subscale.

  11. Comparative Efficacies of Collagen-Based 3D Printed PCL/PLGA/β-TCP Composite Block Bone Grafts and Biphasic Calcium Phosphate Bone Substitute for Bone Regeneration.

    Science.gov (United States)

    Hwang, Kyoung-Sub; Choi, Jae-Won; Kim, Jae-Hun; Chung, Ho Yun; Jin, Songwan; Shim, Jin-Hyung; Yun, Won-Soo; Jeong, Chang-Mo; Huh, Jung-Bo

    2017-04-17

    The purpose of this study was to compare bone regeneration and space maintaining ability of three-dimensional (3D) printed bone grafts with conventional biphasic calcium phosphate (BCP). After mixing polycaprolactone (PCL), poly (lactic-co-glycolic acid) (PLGA), and β-tricalcium phosphate (β-TCP) in a 4:4:2 ratio, PCL/PLGA/β-TCP particulate bone grafts were fabricated using 3D printing technology. Fabricated particulate bone grafts were mixed with atelocollagen to produce collagen-based PCL/PLGA/β-TCP composite block bone grafts. After formation of calvarial defects 8 mm in diameter, PCL/PLGA/β-TCP composite block bone grafts and BCP were implanted into bone defects of 32 rats. Although PCL/PLGA/β-TCP composite block bone grafts were not superior in bone regeneration ability compared to BCP, the results showed relatively similar performance. Furthermore, PCL/PLGA/β-TCP composite block bone grafts showed better ability to maintain bone defects and to support barrier membranes than BCP. Therefore, within the limitations of this study, PCL/PLGA/β-TCP composite block bone grafts could be considered as an alternative to synthetic bone grafts available for clinical use.

  12. Synthetic cannabis and respiratory depression.

    Science.gov (United States)

    Jinwala, Felecia N; Gupta, Mayank

    2012-12-01

    In recent years, synthetic cannabis use has been increasing in appeal among adolescents, and its use is now at a 30 year peak among high school seniors. The constituents of synthetic cannabis are difficult to monitor, given the drug's easy accessibility. Currently, 40 U.S. states have banned the distribution and use of some known synthetic cannabinoids, and have included these drugs in the Schedule I category. The depressive respiratory effect in humans caused by synthetic cannabis inhalation has not been thoroughly investigated in the medical literature. We are the first to report, to our knowledge, two cases of self-reported synthetic cannabis use leading to respiratory depression and necessary intubation.

  13. Autologous nerve graft repair of different degrees of sciatic nerve defect: stress and displacement at the anastomosis in a three-dimensional fnite element simulation model

    Directory of Open Access Journals (Sweden)

    Cheng-dong Piao

    2015-01-01

    Full Text Available In the repair of peripheral nerve injury using autologous or synthetic nerve grafting, the magnitude of tensile forces at the anastomosis affects its response to physiological stress and the ultimate success of the treatment. One-dimensional stretching is commonly used to measure changes in tensile stress and strain however, the accuracy of this simple method is limited. Therefore, in the present study, we established three-dimensional finite element models of sciatic nerve defects repaired by autologous nerve grafts. Using PRO E 5.0 finite element simulation software, we calculated the maximum stress and displacement of an anastomosis under a 5 N load in 10-, 20-, 30-, 40-mm long autologous nerve grafts. We found that maximum displacement increased with graft length, consistent with specimen force. These findings indicate that three-dimensional finite element simulation is a feasible method for analyzing stress and displacement at the anastomosis after autologous nerve grafting.

  14. 21 CFR 876.5600 - Sorbent regenerated dialysate delivery system for hemodialysis.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Sorbent regenerated dialysate delivery system for hemodialysis. 876.5600 Section 876.5600 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND....5600 Sorbent regenerated dialysate delivery system for hemodialysis. (a) Identification. A sorbent...

  15. The Relationship between Iron Deficiency and Restless Legs Syndrome in Hemodialysis Patients

    Directory of Open Access Journals (Sweden)

    R Ghanei Gheshlagh

    2012-10-01

    Full Text Available Introduction: Restless legs syndrome is a neurological disorder; hemodialysis patients seem to suffer more from this syndrome. Although the pathophysiology of restless legs syndrome is still unknown, assessment of factors associated with this syndrome can help to develop medical knowledge in this field. The present study assessed the relationship between restless legs syndrome, serum iron, and serum ferritin levels in patients on hemodialysis. Methods: This descriptive study was carried out with purposive sampling method on 168 hemodialysis patients who referred to the Urmia Taleghani Hospital Hemodialysis Unit. Data were gathered using restless legs syndrome questionnaire and laboratory Index of serum iron and ferritin. Data were analyzed using descriptive and inferential statistical tests. Results: The study results revealed that 38.7 percent of samples complained from restless legs syndrome whose average score serum iron was 78±29.3 μg. Results showed in hemodialysis patients with restless legs syndrome, serum iron and serum ferritin levels were significantly lower than hemodialysis patients without restless legs syndrome (p=0. 02, p=0.005. Conclusion: Considering the high prevalence of restless legs syndrome in patients with hemodialysis, identification of factors associated with this syndrome and providing the necessary solutions for modifying or eliminating the factors, seem to be necessary. Since the relationship between indicators of iron and ferritin and restless legs syndrome in hemodialysis patients is confirmed, the results can be helpful in the treatment and management of these patients.

  16. Frequency of and risk factors for poor cognitive performance in hemodialysis patients

    Science.gov (United States)

    There are few detailed data on cognition in patients undergoing dialysis. We evaluated the frequency of and risk factors for poor cognitive performance using detailed neurocognitive testing. In this cross-sectional cohort study, 314 hemodialysis patients from 6 Boston-area hemodialysis units underwe...

  17. Relationship between the target dose for hemodialysis adequacy and nutritional assessment.

    Science.gov (United States)

    Kaya, Tezcan; Sipahi, Savas; Cinemre, Hakan; Karacaer, Cengiz; Varim, Ceyhun; Nalbant, Ahmet; Tamer, Ali

    2016-01-01

    Some studies have shown an increased relative risk of death for patients with higher levels of Kt/V, which may be associated with marked malnutrition. The aim of this study was to investigate the relationship between the target dose for hemodialysis adequacy, as measured by Kt/V, and various nutritional parameters in hemodialysis patients. Cross-sectional. Sakarya University Faculty of Medicine, Turkey between February 2014 and March 2014. For consecutive patients who met criteria, the following were recorded: nutritional status, dialysis malnutrition score (DMS), the geriatric nutritional risk index (GNRI), serum albumin level, anthropometric measurements, and bioelectrical impedance analysis. Patients were classified into two groups according to the target hemodialysis dose for single-pool Kt/V: patients with spKt/V >=1.4 and patients with spKt/V hemodialysis adequacy by nutritional assessment. The prevalence of malnutrition in 286 patients with target dose hemodialysis (spKt/V >=1.4) was significantly higher according to body mass index (BMI), DMS, and GDRI (P=.001, P=.006, and P=.004, respectively) compared with patients with a lower target dose (spKt/V = 1.4) (P hemodialysis patients who received the target hemodialysis. Evaluation of nutritional status in patients at the target hemodialysis dose should be considered. Data collected from a single region; small sample size; cross-sectional design is disadvantageous.

  18. Retrosternal friction-induced late disruption of the anastomotic site between Bentall's valved conduit and an aortic arch graft: report of a case.

    Science.gov (United States)

    Fukada, Johji; Morishita, Kiyofumi; Kawaharada, Nobuyoshi; Kurimoto, Yoshihiko; Muraki, Satoshi; Satsu, Takuma; Abe, Tomio

    2003-01-01

    We report a case of late mediastinal false aneurysm originating from disruption of the suture line between synthetic vascular grafts for aortic root and total aortic arch replacements. This aneurysm developed without any infection in a patient with Marfan's syndrome. To our knowledge, this event has never been reported before. The only possible cause of this disruption was that the monofilament suture was broken by continuous friction between the pointed anastomotic line and the sternum since the operation. The treatment options for this unusual event after extended synthetic graft replacement are discussed.

  19. Septal graft in laryngeal reconstruction

    International Nuclear Information System (INIS)

    Bahannan, Abdulrahman; Slavicek, A.; Taudy, M.; Chovanec, M.

    2006-01-01

    A 62-year-old woman presented with symptoms of dyspnea. Ultrasonography and computed tomography examinations revealed mass extending from the cricoid cartilage to the left lobe of thyroid gland and thyroid cartilage. Cytology revealed possibility of cartilaginous origin, which was proven to be chondrosarcoma (Grade 1) from the biopsy specimen obtained during panendosopy. She underwent one stage radical resection and immediate reconstruction of laryngeal skeleton defect by mucocartilaginous graft from the nasal septum. Her postoperative course was optimal with preservation of the laryngeal functions. Twenty-eight months postoperatively, she had to undergo total laryngectomy as a salvage procedure for the advanced local recurrence. We report on the relatively easy technique for functional reconstruction of the large laryngeal defect with the employment cartilage graft from the nasal septum. (author)

  20. Serum leptin level and its significance in chronic renal failure hemodialysis patients

    International Nuclear Information System (INIS)

    Zhang Yong; You Yuping; Chen Weizhen; Mo Congjian

    2003-01-01

    To study serum leptin level in chronic renal failure (CRF) hemodialysis patients and the relationship between serum leptin level and residue renal function, body composition, and indices of malnutrition, 31 end-stage CRF hemodialysis patients and 38 healthy people were enrolled. Serum leptin levels were detected by radioimmunoassay. BMI, %Fat and LBM were measured by bioelectrical impedance analysis device. Alb, Chol, Hgb, BUN, SCr and Ccr of the patients were also examined. Results showed that Serum leptin level in end-stage CRF hemodialysis patients was markedly higher than that in healthy controls (P 0.05). Conclusion: Hyperleptinemia existed in end-stage CRF hemodialysis patients and might cause the loss of LBM. The leptin level was not correlated with residue renal function, but it could reflect the fat content. However, serum leptin did not play a significant role in protein malnutrition in end-stage CRF hemodialysis patients

  1. Fístula axilo-cava para hemodiálise: relato de caso Axillary arteriovenous fistula for hemodialysis: case report

    Directory of Open Access Journals (Sweden)

    Yosio Nagato

    2009-12-01

    Full Text Available Na confecção de fístula arteriovenosa (FAV para hemodiálise, condutos venosos autógenos demonstram performance superior quando comparados com material protético em relação à perviedade primária ou secundária. A prótese de politetrafluoroetileno (PTFE é reservada para casos de falência de material autógeno e é geralmente utilizada em fístulas em membros superiores. Descrevemos o caso de uma paciente de 52 anos que, após falência de acessos para hemodiálise e impossibilidade de realização de diálise peritoneal em razão de peritonite bacteriana, foi submetida à confecção de FAV entre a artéria axilar direita e a veia cava inferior com prótese de PTFE de 6 mm. O acesso foi utilizado para hemodiálise 1 mês após sua criação e permanece pérvio após 24 meses. Até o momento, não houve complicações infecciosas, sinais de insuficiência cardíaca ou síndrome de roubo em membro superior direito.With regards to the creation of an arteriovenous fistula (AV fistula for hemodialysis, autogenous venous grafts clearly show high performance when compared with prosthetic material in terms of primary or secondary patency. Polytetrafluoroethylene (PTFE grafts for the reconstruction of AV fistulae must be restricted to cases of failure of the autogenous material, which is generally used in upper limb fistulae. We describe a case of a 52-year-old patient, who, after access failure for hemodialysis and the impossibility of performing peritoneal dialysis due to bacterial peritonitis, underwent the reconstruction of an AV fistula between the right axillary artery and the cava vein using a 6-mm PTFE prosthesis. One month after surgery, this AV fistula started to be used for hemodialysis. The AV fistula remains patent 24 months after its creation. No infectious complications, cardiac insufficiency symptoms, or steal syndromes of right upper limb were detected.

  2. Graft versus host disease prophylaxis

    Indian Academy of Sciences (India)

    First page Back Continue Last page Overview Graphics. Graft versus host disease prophylaxis. Cyclosporine -2.5mg/KG IV over 4 hrs q12h. - 5mg/Kg BD orally for 6 months - taper- stop at one year if no GVHD. Methotrexate :INITIAL. day +1- 15mg/m2; day + 3, 6, 11- 10 mg/m2; :CURRENT; day +1-10mg/m2; day + 3,6,11 ...

  3. Synthetic cannabinoids revealing adrenoleukodystrophy.

    Science.gov (United States)

    Fellner, Avi; Benninger, Felix; Djaldetti, Ruth

    2016-02-01

    We report a 41-year-old man who presented with a first generalized tonic-clonic seizure after recent consumption of a synthetic cannabinoid. MRI showed extensive bilateral, mainly frontal, white matter lesions. Blood analysis for very long chain fatty acids was compatible with adrenoleukodystrophy, and a missense mutation in the ABCD1 gene confirmed the diagnosis. We hypothesize that cannabinoid use might have contributed to metabolic decompensation with subacute worsening of the underlying condition. Copyright © 2015 Elsevier Ltd. All rights reserved.

  4. CASH vs. SYNTHETIC CDOs

    Directory of Open Access Journals (Sweden)

    Silviu Eduard Dinca

    2015-12-01

    Full Text Available During the past few years, in the recent post-crisis aftermath, global asset managers are constantly searching new ways to optimize their investment portfolios while financial and banking institutions around the world are exploring new alternatives to better secure their financing and refinancing demands altogether with the enhancement of their risk management capabilities. We will exhibit herewith a comparison between the true-sale and synthetic CDO securitizations as financial markets-based funding, investment and risks mitigation techniques, highlighting certain key structuring and implementation specifics on each of them.

  5. Intermittent hemodialysis is superior to continuous veno-venous hemodialysis/hemodiafiltration to eliminate methanol and formate during treatment for methanol poisoning

    Czech Academy of Sciences Publication Activity Database

    Zakharov, S.; Pelclová, D.; Navrátil, Tomáš; Běláček, J.; Kurcová, I.; Komzák, O.; Šálek, T.; Latta, J.; Turek, R.; Boček, R.; Kučera, C.; Hubáček, J. A.; Fenclová, Z.; Petřík, V.; Čermák, M.; Hovda, K. E.

    2014-01-01

    Roč. 86, č. 1 (2014), s. 199-207 ISSN 0085-2538 Institutional support: RVO:61388955 Keywords : Intermittent hemodialysis * hemodiafiltration * methanol poisonings Subject RIV: CF - Physical ; Theoretical Chemistry Impact factor: 8.563, year: 2014

  6. Biological effects of compressive forces exerted on particulate bone grafts during socket preservation: animal study.

    Science.gov (United States)

    Delgado-Ruiz, Rafael; Romanos, Georgios E; Alexandre Gerhke, Sergio; Gomez-Moreno, Gerardo; Maté-Sánchez de Val, José Eduardo; Calvo-Guirado, José Luis

    2016-08-02

    To compare different compressive forces exerted on a particulate graft material during socket preservation and their effects on bone regeneration. Six male dogs were used. The second, third, and fourth premolars, and the first molar were extracted bilaterally at the lower jaws. A particulate synthetic biphasic grafting material (60% HA and 40% β-tricalcium phosphate) was used. Three different standardized compressive forces were applied randomly during the socket preservation. The sample was divided into four experimental groups Test A (10 g), Test B (50 g), Test C (200 g), and Control (empty sockets). Collagen membranes were placed, and primary closure was obtained. Two months after the surgery the animals were sacrificed, and histomorphometric analysis of non-decalcified samples was performed at the coronal, middle, and apical thirds. Grafted sockets resulted in higher bony contour (3 ± 0.43 mm 2 ; P  0.05). Within the limitations of this experimental animal study, it might be concluded that grafted sockets compressed with 200 g force will have higher bony contours; higher compressive forces facilitate the penetration of the particulate graft material into the apical area of the socket and results in more bone formation at the coronal, middle, and apical thirds. © 2016 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.

  7. Contributions of myocardial scintigraphy in coronary heart disease in chronic hemodialysis: A prospective study of 52 cases

    International Nuclear Information System (INIS)

    Souli, Jihene

    2007-01-01

    We propose in this work to assess the prevalence of cardiovascular risk factors in the chronic hemodialysis as well as diagnostic and prognostic performance of myocardial SPECT. We conducted a prospective study over a period of 5 years (1999-2004) assemble 52 chronic hemodialysis patients, 73 pour cent were treated at the hemodialysis unit of the principal Hospital Military - Tunis and 27 pour cent the hemodialysis unit of the polyclinic CNSS El Khadhra. The conventional periodic hemodialysis bicarbonate was the dialysis technique used in all our patients.

  8. Quality of life in patients treated with hemodialysis or peritoneal dialysis: what are the important determinants?

    Science.gov (United States)

    Manns, B; Johnson, J A; Taub, K; Mortis, G; Ghali, W A; Donaldson, C

    2003-11-01

    Patients with end-stage renal disease (ESRD) have significant impairments in health-related quality of life (HRQOL). In part, this is due to the intrusiveness of the treatment (hemodialysis or peritoneal dialysis) that is required. It is unclear whether hemodialysis or peritoneal dialysis is associated with a higher HRQOL. 192 prevalent patients who self-selected treatment with hemodialysis (either in-center, satellite or home/self-care hemodialysis) or peritoneal dialysis were studied to determine whether treatment with hemodialysis or peritoneal dialysis is associated with a higher HRQOL. Demographic, laboratory and clinical information (including the presence of comorbid conditions using the Charlson comorbidity index) was assessed at baseline. The outcome of interest was HRQOL, which was measured using the Kidney Disease Quality of Life-Short Form (KDQOL-SF), the Short-Form 36 (SF-36) and the EuroQol EQ-5D at baseline and after 6 and 12 months of follow-up. There was no significant difference in HRQOL scores for the SF-36, the EQ-5D and for 9 of 11 KDQOL dimensions for patients treated with hemodialysis or peritoneal dialysis at baseline. As expected, HRQOL was significantly lower for patients who had more comorbid disease, required assistance with their daily care, and for patients with less than a grade 12 education. After controlling for the effect of other important variables, HRQOL (as measured by the EQ-5D visual analog or index scores) did not differ between hemodialysis and peritoneal dialysis patients. HRQOL was stable over time, both for patients who started on hemodialysis or peritoneal dialysis. There is no significant difference in HRQOL for prevalent ESRD patients treated with hemodialysis or peritoneal dialysis. It will be important to determine if this finding holds true for incident patients treated with hemodialysis or peritoneal dialysis.

  9. Effect of Hemodialysis on Left and Right Ventricular Volume and Function

    International Nuclear Information System (INIS)

    Han, Jin Suk; Koh, Chang Soon

    1985-01-01

    With the improvement of hemodialysis, the course of thc discase in patient with endstage renal disease has been clearly improved. Nevertheless, among several shortcomings to our present mode of renal replacement therapy, cardiovascular complications have been the leading cause of morbidity and mortality. Several factors such as anemia, arteriovenous shunting of blood, intermittent extracorporeal circulation and hypertension may be contributing. But little is known about the quantitative cardiac hemodynamic characteristics occurred during hemodialysis. The purpose of this study is to observe the sequential hemodynamic changes before, during and after the hemodialysis and to investigate: reliable parameters in the detection of ventricular dysfunction. In the present study, equilibrium radionuclide cardiac angiography was performed and left and right ventricular volume indices, ejection phase indices of both ventricular, performance were measured in the 16 stable patients with chronic renal failure treated with maintenance hemodialysis sequentially i.e. before, during (carly and late phase) and after the hemodialysis. The results obtained were as follows; 1) The indices of the left ventricular function were not changed during the hemodialysis but increased after the hemodialysis. 2) The indices of the right ventricular function(EF, SVI) were significantly decreased in the early phase (15, 30 minutes after starting extracorporeal circulation) but recovered after the hemodialysis, 3) The ratio of right ventricular to left ventricular ejection fraction was significantly decreased in the early phase and the lung volume indices were significantly increased at the same phase. As a conclusion, hemodialysis improves left ventricular function maybe du to increased contractility, and effects on the right ventricular function maybe due to the increased lung volume in the early phase of hemodialysis.

  10. Calcium phosphate ceramics as bone graft substitutes in filling bone tumor defects

    Directory of Open Access Journals (Sweden)

    Saikia K

    2008-01-01

    Full Text Available Background: Synthetic bio-inert materials are currently used as an alternative to autogenous bone graft. Calcium hydroxyapatite (HA and Beta tri-calcium phosphate (β-TCP, which belong to the calcium phosphate ceramics group, are biocompatible and osteo-conductive. The purpose of this study is to analyse the use of HA and β-TCP in their ceramic forms as a bone graft substitute in filling bone voids after curettage of benign bone tumors. Materials and Methods: Twenty-four patients in the age range of 3.5-55 years (mean 14.3 years having benign bone tumors with bone defects were filled with bone graft substitute following curettage. In 20 patients bone defects were filled with block/granules of HA ceramic and in four with β-TCP. Fibular strut graft was packed with HA in four patients. The patients were followed up for an average of 18 months (range 12-36 months. Results: The functional status of the patients at follow-up was evaluated and compared with preoperative functional status. Early incorporation of graft substitutes became evident radiologically between 6 and 10 weeks (Stage I. Complete incorporation (Stage III was observed in an average of nine months (6-18 months. Clinical healing was observed before radiological healing. The average time taken to return to preoperative function was 14 weeks. There was no recurrence of lesion or growth retardation. Conclusion: Calcium hydroxyapatite and β-TCP are excellent bone graft substitutes for autogenous bone graft in filling voids after curettage of benign bone tumors.

  11. Preliminary studies on 1-vinyl-2-pyrrolidone grafting onto cellulose by pre-irradiation method

    International Nuclear Information System (INIS)

    Severich, Patrick; Dutra, Rodrigo da Costa; Kodama, Yasko

    2017-01-01

    Cellulose is considered a renewable biopolymer most abundant in nature. Better functional surfaces can be Obtained by modifying cellulose. On the other hand, poly vinyl pyrrolidone, PVP, is a synthetic nontoxic, water-soluble polymer frequently used in an extensive variety of applications including several pharmaceutical applications. Grafting 1-vinyl-2-pyrrolidone, NVP, onto polymeric cellulose can be obtained by ionizing radiation. Ionizing radiation grafting can be affected by several factors as environment, solvent, monomer concentration, temperature of graft reaction. Grafting by ionizing radiation can be performed by three methods, pre-irradiation, oxidation by peroxide and simultaneous irradiation. In this study, it was used pre-irradiation method of cellulose. Paper filter without ash, NVP without purification was used in this study. Paper samples were exposed to electron beam from Dynamitron Accelerator with radiation absorbed dose of 25 kGy. Influence of NVP concentration, temperature of reaction after irradiation on degree of grafting (DG) was studied. Also, cellulose radicals of grafted paper samples was studied by electron paramagnetic resonance using a Bruker X-band ESR at room temperature just after heating reaction. Small decrease of cellulose radicals was observed with increasing reaction temperature. It was observed DG small increase with increasing concentration of monomer in solution of water ethanol 50-50 v:v and rising temperature of reaction. Further tests using simultaneous method of grafting of NVP in cellulose paper, in water:ethanol 75:25 v:v solution, induced by gamma irradiation were performed. It was observed homopolymerization forming PVP with increasing monomer concentration. (author)

  12. Preliminary studies on 1-vinyl-2-pyrrolidone grafting onto cellulose by pre-irradiation method

    Energy Technology Data Exchange (ETDEWEB)

    Severich, Patrick; Dutra, Rodrigo da Costa; Kodama, Yasko, E-mail: ykodama@ipen.br, E-mail: patrick.severich@ipen.br, E-mail: rodrigo.dutra@ipen.br [Instituto de Pesquisas Energética s e Nucleares (IPEN-CNEN/SP), São Paulo, SP (Brazil)

    2017-07-01

    Cellulose is considered a renewable biopolymer most abundant in nature. Better functional surfaces can be Obtained by modifying cellulose. On the other hand, poly vinyl pyrrolidone, PVP, is a synthetic nontoxic, water-soluble polymer frequently used in an extensive variety of applications including several pharmaceutical applications. Grafting 1-vinyl-2-pyrrolidone, NVP, onto polymeric cellulose can be obtained by ionizing radiation. Ionizing radiation grafting can be affected by several factors as environment, solvent, monomer concentration, temperature of graft reaction. Grafting by ionizing radiation can be performed by three methods, pre-irradiation, oxidation by peroxide and simultaneous irradiation. In this study, it was used pre-irradiation method of cellulose. Paper filter without ash, NVP without purification was used in this study. Paper samples were exposed to electron beam from Dynamitron Accelerator with radiation absorbed dose of 25 kGy. Influence of NVP concentration, temperature of reaction after irradiation on degree of grafting (DG) was studied. Also, cellulose radicals of grafted paper samples was studied by electron paramagnetic resonance using a Bruker X-band ESR at room temperature just after heating reaction. Small decrease of cellulose radicals was observed with increasing reaction temperature. It was observed DG small increase with increasing concentration of monomer in solution of water ethanol 50-50 v:v and rising temperature of reaction. Further tests using simultaneous method of grafting of NVP in cellulose paper, in water:ethanol 75:25 v:v solution, induced by gamma irradiation were performed. It was observed homopolymerization forming PVP with increasing monomer concentration. (author)

  13. Comparison of Axillary Loop and Straight Grafts Patency and Their Complications for Hemodialylis Access

    Directory of Open Access Journals (Sweden)

    J KHoshnevis

    2011-08-01

    Full Text Available Introduction & Objective: Dialysis vascular access complications are important causes of morbidity in chronic hemodialysis patients. The aim of the present study was a comparison of auxillary loop and atraight grafts patency and its complications for hemodialysis access. Materials & Methods: In this cohort study conducted at Shahid Beheshti Medical University, 58 patients who underwent placement of loop or straight access grafts were included in the study. Demographics, primary and secondary patency rates and complications like thrombosis, infection, bleeding, steal syndrome and other complications were compared in these two groups. The collected data was analyzed by the SPSS statistical software using the chi-square test, t-test, and logistic regression. Results: Thrombosis rates were 51.1% and 53.8% in straight and loop groups respectively (P=0.862, steal syndrome rates were 2.2% and 7.7% in straight and loop groups respectively (P=0.341, psudoanevrism were 11.1% and 23.1% in straight and loop groups respectively (P=0.270, bleeding rates were 4.4% and 0% in straight and loop groups respectively (P=0.439, infection rate were 8.9% and 7.7% in straight and loop groups respectively (P=0.892, and primary patency rate after 1 month were 88.9% and 92.3% respectively (P=0.721, and primary patency rate after 24 month were 31% and 55.5% respectively (P=0.058. Secondary patency rate after 3 month were 75.6% and 92.3% respectively (P=0.189, and secondary patency rate after 24 month were 37.9% and 66.7% respectively (P=0.044. Conclusion: PTFE vascular graft seems to be an appropriate vascular access and is a promising alternative when upper extremity arteriovenous fistulas cannot be constructed. Additionally, there was no significant different between two groups for complications and early patency, but late patency was better in loop group. More study is necessary for final judgment.

  14. Synthetic collective intelligence.

    Science.gov (United States)

    Solé, Ricard; Amor, Daniel R; Duran-Nebreda, Salva; Conde-Pueyo, Núria; Carbonell-Ballestero, Max; Montañez, Raúl

    2016-10-01

    Intelligent systems have emerged in our biosphere in different contexts and achieving different levels of complexity. The requirement of communication in a social context has been in all cases a determinant. The human brain, probably co-evolving with language, is an exceedingly successful example. Similarly, social insects complex collective decisions emerge from information exchanges between many agents. The difference is that such processing is obtained out of a limited individual cognitive power. Computational models and embodied versions using non-living systems, particularly involving robot swarms, have been used to explore the potentiality of collective intelligence. Here we suggest a novel approach to the problem grounded in the genetic engineering of unicellular systems, which can be modified in order to interact, store memories or adapt to external stimuli in collective ways. What we label as Synthetic Swarm Intelligence defines a parallel approach to the evolution of computation and swarm intelligence and allows to explore potential embodied scenarios for decision making at the microscale. Here, we consider several relevant examples of collective intelligence and their synthetic organism counterparts. Copyright © 2016 Elsevier Ireland Ltd. All rights reserved.

  15. Development of biomimetic thermoplastic polyurethane/fibroin small-diameter vascular grafts via a novel electrospinning approach.

    Science.gov (United States)

    Yu, Emily; Mi, Hao-Yang; Zhang, Jue; Thomson, James A; Turng, Lih-Sheng

    2018-04-01

    A new electrospinning approach for fabricating vascular grafts with a layered, circumferentially aligned, and micro-wavy fibrous structure similar to natural elastic tissues has been developed. The customized electrospinning collector was able to generate wavy fibers using the dynamic "jump rope" collecting process, which also solved the sample removal problem for mandrel-type collectors. In this study, natural silk fibroin and synthetic thermoplastic polyurethane (TPU) were combined at different weight ratios to produce hybrid small-diameter vascular grafts. The purpose of combining these two materials was to leverage the bioactivity and tunable mechanical properties of these natural and synthetic materials. Results showed that the electrospun fiber morphology was highly influenced by the material compositions and solvents employed. All of the TPU/fibroin hybrid grafts had mechanical properties comparable to natural blood vessels. The circumferentially aligned and wavy biomimetic configuration provided the grafts with a sufficient toe region and the capacity for long-term usage under repeated dilatation and contraction. Cell culture tests with human endothelial cells (EC) also revealed high cell viability and good biocompatibility for these grafts. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 106A: 985-996, 2018. © 2017 Wiley Periodicals, Inc.

  16. Evaluation of early coronary graft patency after coronary artery bypass graft surgery using multislice computed tomography angiography

    Directory of Open Access Journals (Sweden)

    Raissi Kamal

    2009-12-01

    Full Text Available Abstract Background Coronary artery bypass graft (CABG surgery is the standard of care in the treatment of advanced coronary artery disease, and its long-term results are affected by the failure of bypass grafts. The aim of the present study was to evaluate the early patency rate in coronary bypass grafts. Methods A total of 107 consecutive patients who underwent CABG were included in this study. Early graft patency was evaluated via computed tomography (CT angiography in the first week after surgery. Results There were a total of 366 grafts, comprised of 250 venous grafts and 116 arterial grafts. Multi-slice CT detected acute graft occlusions in 32 (8.7% of all the grafts, including 26 (10% of the 250 venous grafts and 6 (5% of the 116 arterial grafts. The patency rates obtained were 97.3% for the left internal mammary (IMA grafts, 50% for the radial artery grafts, and 50% for the right IMA grafts. Additionally, 107 (96.4% grafts to the left anterior descending artery (LAD were classified as patent, whereas 1 (30% of the 3 grafts in the left circumflex (LCX region and 1 (50% of the 2 grafts in the right coronary artery (RCA territory were found to be occluded. In the venous category, 8 (13.7% of the 58 grafts to LAD were found to be occluded. In the LCX region, 9 (8.5% of the 106 grafts were classified as occluded, while the remaining 97 (91.5% grafts were patent. The venous grafts to RCA were occluded in 9 (10.4% of the 86 grafts. Amongst the multiple preoperative, intraoperative, and postoperative factors, pump time was significantly longer in the patients with occluded grafts than in those with patent grafts (P = 0.04. Conclusion The IMA grafts had the highest early patency rate amongst the coronary bypass grafts. However, the other arterial grafts were associated with a high rate of acute occlusions.

  17. Massive acetaminophen overdose: effect of hemodialysis on acetaminophen and acetylcysteine kinetics.

    Science.gov (United States)

    Ghannoum, Marc; Kazim, Sara; Grunbaum, Ami M; Villeneuve, Eric; Gosselin, Sophie

    2016-07-01

    Early onset acidosis from mitochondrial toxicity can be observed in massive acetaminophen poisoning prior to the development of hepatotoxicity. In this context, the efficacy of acetylcysteine to reverse mitochondrial toxicity remains unclear and hemodialysis may offer prompt correction of acidosis. Unfortunately, toxicokinetics of acetaminophen and acetylcysteine during extracorporeal treatments hemodialysis have seldom been described. An 18-year-old woman presented to the emergency department 60 minutes after ingestion of 100 g of acetaminophen, and unknown amounts of ibuprofen and ethanol. Initial assessment revealed an agitated patient. Her mental status worsened and she required intubation for airway protection. Investigations showed metabolic acidosis with lactate peaking at 8.6 mmol/L. Liver and coagulation profiles remained normal. Acetaminophen concentration peaked at 981 μg/ml (6496 μmol/L). Pending hemodialysis, the patient received 100 g of activated charcoal and an acetylcysteine infusion at 150 mg/kg over 1 hour, followed by 12.5 mg/kg/h for 4 hours. During hemodialysis, the infusion was maintained at 12.5 mg/kg/h to compensate for expected removal before it was decreased to 6.25 mg/kg for 20 hours after hemodialysis. The patient rapidly improved during hemodialysis and was discharged 48 hours post-admission. The acetaminophen elimination half-life was 5.2 hours prior to hemodialysis, 1.9-hours during hemodialysis and 3.6 hours post hemodialysis. The acetaminophen and acetylcysteine clearances by A-V gradient during hemodialysis were 160.4 ml/min and 190.3 ml/min, respectively. Hemodialysis removed a total of 20.6 g of acetaminophen and 17.9 g of acetylcysteine. This study confirms the high dialyzability of both acetaminophen and acetylcysteine. Hemodialysis appears to be a beneficial therapeutic option in cases of massive acetaminophen ingestion with coma and lactic acidosis. Additionally, these results

  18. Abaca/polyester nonwoven fabric functionalization for metal ion adsorbent synthesis via electron beam-induced emulsion grafting

    International Nuclear Information System (INIS)

    Madrid, Jordan F.; Ueki, Yuji; Seko, Noriaki

    2013-01-01

    A metal ion adsorbent was developed from a nonwoven fabric trunk material composed of both natural and synthetic polymers. A pre-irradiation technique was used for emulsion grafting of glycidyl methacrylate (GMA) onto an electron beam irradiated abaca/polyester nonwoven fabric (APNWF). The dependence of degree of grafting (Dg), calculated from the weight of APNWF before and after grafting, on absorbed dose, reaction time and monomer concentration were evaluated. After 50 kGy irradiation with 2 MeV electron beam and subsequent 3 h reaction with an emulsion consisting of 5% GMA and 0.5% polyoxyethylene sorbitan monolaurate (Tween 20) surfactant in deionized water at 40 °C, a grafted APNWF with a Dg greater than 150% was obtained. The GMA-grafted APNWF was further modified by reaction with ethylenediamine (EDA) in isopropyl alcohol at 60 °C to introduce amine functional groups. After a 3 h reaction with 50% EDA, an amine group density of 2.7 mmole/gram adsorbent was achieved based from elemental analysis. Batch adsorption experiments were performed using Cu 2+ and Ni 2+ ions in aqueous solutions with initial pH of 5 at 30 °C. Results show that the adsorption capacity of the grafted adsorbent for Cu 2+ is four times higher than Ni 2+ ions. - Highlights: • An amine type adsorbent from abaca/polyester nonwoven fabric was synthesized. • Pre-irradiation method was used in grafting glycidyl methacrylate on nonwoven fabric. • Radiation-induced grafting was performed with monomer in emulsion state. • The calculated adsorption capacity for Cu 2+ is four times higher than Ni 2+ ions. • Grafted adsorbent can remove Cu 2+ faster than a chemically similar commercial resin

  19. Novel expansion techniques for skin grafts

    Science.gov (United States)

    Kadam, Dinesh

    2016-01-01

    The quest for skin expansion is not restricted to cover a large area alone, but to produce acceptable uniform surfaces, robust engraftment to withstand mechanical shear and infection, with a minimal donor morbidity. Ease of the technique, shorter healing period and reproducible results are essential parameters to adopt novel techniques. Significant advances seen in four fronts of autologous grafting are: (1) Dermal–epidermal graft expansion techniques, (2) epidermal graft harvests technique, (3) melanocyte-rich basal cell therapy for vitiligo and (4) robust and faster autologous cell cultures. Meek's original concept that the sum of perimeter of smaller grafts is larger than the harvested graft, and smaller the graft size, the greater is the potential for regeneration is witnessed in newer modification. Further, as graft size becomes smaller or minced, these micrografts can survive on the wound bed exudate irrespective of their dermal orientation. Expansion produced by 4 mm × 4 mm sized Meek micrografts is 10-folds, similarly 0.8 mm × 0.8 mm size micrografts produce 100-fold expansion, which becomes 700-fold with pixel grafts of 0.3 mm × 0.3 mm size. Fractional skin harvest is another new technique with 700 μ size full thickness graft. These provide instant autologous non-cultured graft to cover extensive areas with similar quality of engraftment surface as split skin grafts. Newer tools for epidermal blister graft harvest quickly, with uniform size to produce 7-fold expansions with reproducible results. In addition, donor area heals faster with minimal scar. Melanocyte-rich cell suspension is utilised in vitiligo surgery tapping the potential of hair root melanocytes. Further advances in the cell culture to reduce the cultivation time and provide stronger epidermal sheets with dermal carrier are seen in trials. PMID:27274117

  20. Graft infections after surgical aortic reconstructions

    OpenAIRE

    Berger, P.

    2015-01-01

    Prosthetic vascular grafts are frequently used to reconstruct (part) of the aorta. Every surgical procedure caries a certain risk for infection and when a prosthetic aortic graft is implanted, this may lead to an aortic graft infection (AGI). Endovascular techniques have gradually replaced open surgical reconstructions as first line of treatment for aorto-iliac diseases. Nowadays, open reconstructions are primarily reserved for patients unsuitable for endovascular reconstructions or for redo ...

  1. Outcomes of AV Fistulas and AV Grafts after Interventional Stent-Graft Deployment in Haemodialysis Patients.

    Science.gov (United States)

    Schmelter, Christopher; Raab, Udo; Lazarus, Friedrich; Ruppert, Volker; Vorwerk, Dierk

    2015-08-01

    The study was designed to assess outcomes of arteriovenous (AV) accesses after interventional stent-graft deployment in haemodialysis patients. 63 haemodialysis patients with 66 AV fistulas and AV grafts were treated by interventional stent-graft deployment from 2006 to 2012 at our hospital. Data of these patients were retrospectively analysed for location of deployed stent-grafts, occurrence and location of (re-)stenosis and (re-)thrombosis. Complex stenosis was the most frequent indication for stent-graft deployment (45.5%), followed by complications of angioplasty with vessel rupture or dissection (31.8%). A high rate of procedural success was achieved (98.5%). The most frequent location of the deployed stent-graft was the draining vein (66.7%). Stent-graft deployment was more frequent in AV grafts than in AV fistulas. Primary patency was 45.5% at 6 month, 31.3% at 12 month and 19.2% at 24 month. Primary patency was significantly better for AV fistulas than for AV grafts with deployed stent-grafts. Patency of the deployed stent-graft was much better than overall AV access primary patency with deployed stent-graft. Re-stenosis with thrombosis was the most frequent indication for re-intervention. Most frequent location of re-stenosis was the draining vein (37.1%), followed by stenosis at the AV access (29.5%) and the deployed stent-graft (23.5%). Re-stenosis and re-thrombosis remain frequent in AV fistulas and AV grafts in haemodialysis patients despite stent-graft deployment. Re-stenosis of the deployed stent-graft is, only in the minority of the cases, responsible for AV access dysfunction.

  2. Outcomes of AV Fistulas and AV Grafts after Interventional Stent-Graft Deployment in Haemodialysis Patients

    Energy Technology Data Exchange (ETDEWEB)

    Schmelter, Christopher, E-mail: christopher.schmelter@klinikum-ingolstadt.de; Raab, Udo, E-mail: udo.raab@klinikum-ingolstadt.de [Klinikum Ingolstadt, Department of Diagnostic and Interventional Radiology (Germany); Lazarus, Friedrich, E-mail: friedrich.lazarus@klinikum-ingolstadt.de [Klinikum Ingolstadt, Department of Nephrology (Germany); Ruppert, Volker, E-mail: volker.ruppert@klinikum-ingolstadt.de [Klinikum Ingolstadt, Department of Vascular Surgery (Germany); Vorwerk, Dierk, E-mail: dierk.vorwerk@klinikum-ingolstadt.de [Klinikum Ingolstadt, Department of Diagnostic and Interventional Radiology (Germany)

    2015-08-15

    PurposeThe study was designed to assess outcomes of arteriovenous (AV) accesses after interventional stent-graft deployment in haemodialysis patients.Materials and Methods63 haemodialysis patients with 66 AV fistulas and AV grafts were treated by interventional stent-graft deployment from 2006 to 2012 at our hospital. Data of these patients were retrospectively analysed for location of deployed stent-grafts, occurrence and location of (re-)stenosis and (re-)thrombosis. Complex stenosis was the most frequent indication for stent-graft deployment (45.5 %), followed by complications of angioplasty with vessel rupture or dissection (31.8 %).ResultsA high rate of procedural success was achieved (98.5 %). The most frequent location of the deployed stent-graft was the draining vein (66.7 %). Stent-graft deployment was more frequent in AV grafts than in AV fistulas. Primary patency was 45.5 % at 6 month, 31.3 % at 12 month and 19.2 % at 24 month. Primary patency was significantly better for AV fistulas than for AV grafts with deployed stent-grafts. Patency of the deployed stent-graft was much better than overall AV access primary patency with deployed stent-graft. Re-stenosis with thrombosis was the most frequent indication for re-intervention. Most frequent location of re-stenosis was the draining vein (37.1 %), followed by stenosis at the AV access (29.5 %) and the deployed stent-graft (23.5 %).ConclusionRe-stenosis and re-thrombosis remain frequent in AV fistulas and AV grafts in haemodialysis patients despite stent-graft deployment. Re-stenosis of the deployed stent-graft is, only in the minority of the cases, responsible for AV access dysfunction.

  3. Space Synthetic Biology Project

    Science.gov (United States)

    Howard, David; Roman, Monsi; Mansell, James (Matt)

    2015-01-01

    Synthetic biology is an effort to make genetic engineering more useful by standardizing sections of genetic code. By standardizing genetic components, biological engineering will become much more similar to traditional fields of engineering, in which well-defined components and subsystems are readily available in markets. Specifications of the behavior of those components and subsystems can be used to model a system which incorporates them. Then, the behavior of the novel system can be simulated and optimized. Finally, the components and subsystems can be purchased and assembled to create the optimized system, which most often will exhibit behavior similar to that indicated by the model. The Space Synthetic Biology project began in 2012 as a multi-Center effort. The purpose of this project was to harness Synthetic Biology principals to enable NASA's missions. A central target for application was to Environmental Control & Life Support (ECLS). Engineers from NASA Marshall Space Flight Center's (MSFC's) ECLS Systems Development Branch (ES62) were brought into the project to contribute expertise in operational ECLS systems. Project lead scientists chose to pursue the development of bioelectrochemical technologies to spacecraft life support. Therefore, the ECLS element of the project became essentially an effort to develop a bioelectrochemical ECLS subsystem. Bioelectrochemical systems exploit the ability of many microorganisms to drive their metabolisms by direct or indirect utilization of electrical potential gradients. Whereas many microorganisms are capable of deriving the energy required for the processes of interest (such as carbon dioxide (CO2) fixation) from sunlight, it is believed that subsystems utilizing electrotrophs will exhibit smaller mass, volume, and power requirements than those that derive their energy from sunlight. In the first 2 years of the project, MSFC personnel conducted modeling, simulation, and conceptual design efforts to assist the

  4. The autologus graft of epithelial tissue culture

    Directory of Open Access Journals (Sweden)

    Minaee B

    1999-08-01

    Full Text Available With the intention of research about culture and autologus graft of epithelial tissue we used 4 french Albino Rabbits with an average age of 2 months. After reproduction on the support in EMEM (Eagle's Minimum Essential Medium we used this for graft after 4 weeks. This region which grafted total replaced. After fixation of this sample and passing them through various process, histological sections were prepared. These sections were stained with H & E and masson's trichrome and studied by light microscope. We succeeded in graft. We hope in the near future by using the method of epithelium tissue culture improving to treat burned patients.

  5. Life after the synthetic cell

    DEFF Research Database (Denmark)

    Rasmussen, Steen

    2010-01-01

    Nature asked eight synthetic-biology experts about the implications for science and society of the “synthetic cell” made by the J. Craig Venter Institute (JCVI). The institute's team assembled, modified and implanted a synthesized genome into a DNA-free bacterial shell to make a self-replicating ......Nature asked eight synthetic-biology experts about the implications for science and society of the “synthetic cell” made by the J. Craig Venter Institute (JCVI). The institute's team assembled, modified and implanted a synthesized genome into a DNA-free bacterial shell to make a self...

  6. Synthetic biology and occupational risk.

    Science.gov (United States)

    Howard, John; Murashov, Vladimir; Schulte, Paul

    2017-03-01

    Synthetic biology is an emerging interdisciplinary field of biotechnology that involves applying the principles of engineering and chemical design to biological systems. Biosafety professionals have done an excellent job in addressing research laboratory safety as synthetic biology and gene editing have emerged from the larger field of biotechnology. Despite these efforts, risks posed by synthetic biology are of increasing concern as research procedures scale up to industrial processes in the larger bioeconomy. A greater number and variety of workers will be exposed to commercial synthetic biology risks in the future, including risks to a variety of workers from the use of lentiviral vectors as gene transfer devices. There is a need to review and enhance current protection measures in the field of synthetic biology, whether in experimental laboratories where new advances are being researched, in health care settings where treatments using viral vectors as gene delivery systems are increasingly being used, or in the industrial bioeconomy. Enhanced worker protection measures should include increased injury and illness surveillance of the synthetic biology workforce; proactive risk assessment and management of synthetic biology products; research on the relative effectiveness of extrinsic and intrinsic biocontainment methods; specific safety guidance for synthetic biology industrial processes; determination of appropriate medical mitigation measures for lentiviral vector exposure incidents; and greater awareness and involvement in synthetic biology safety by the general occupational safety and health community as well as by government occupational safety and health research and regulatory agencies.

  7. Finding Hope in Synthetic Biology.

    Science.gov (United States)

    Takala, Tuija

    2017-04-01

    For some, synthetic biology represents great hope in offering possible solutions to many of the world's biggest problems, from hunger to sustainable development. Others remain fearful of the harmful uses, such as bioweapons, that synthetic biology can lend itself to, and most hold that issues of biosafety are of utmost importance. In this article, I will evaluate these points of view and conclude that although the biggest promises of synthetic biology are unlikely to become reality, and the probability of accidents is fairly substantial, synthetic biology could still be seen to benefit humanity by enhancing our ethical understanding and by offering a boost to world economy.

  8. Bioimpedance spectroscopy method to determine hypervolemia in maintenance hemodialysis patients.

    Science.gov (United States)

    Merhametsiz, O; Oguz, E G; Yayar, O; Bektan, B; Canbakan, B; Ayli, D

    2015-01-01

    Hypervolemia is a major risk factor for hypertension leading to cardiovascular diseases and also a frequent problem in maintenance hemodialysis (MHD) patients. Fluid overload (FO) can be determined by bioimpedance spectroscopy (BIS) which is a new, practical, and non-invasive method. We tried to determine FO by BIS in MHD patients and find out the relationship between FO and clinical features. We studied 100 MHD patients aged between 20 and 85 years and undergoing hemodialysis three times weekly for minimum one year. By using BIS, we estimated FO and extracellular water (ECW). The patients who exhibited a FO/ECW ratio >15% were considered as FO. Twenty-nine (29.0%) patients had a FO/ECW ratio >15%. In the overhydrated group, the mean pre-hemodialysis systolic blood pressure was 153.3 ± 20.0 mmHg and the mean diastolic blood pressure was 89.1 ± 8.5 mmHg. These were significantly higher than in the non-overhydrated group (113.5 ± 14.5 and 71.0 ± 8.8, p 0.5 and those with CTI of ≤0.5. The median FO/ECW ratio was 0.11 L in the former group and 0.08 L in the latter group with a significant difference (p =0.006). Hypervolemia is associated with high blood pressure and left ventricular hypertrophy that should be treated effectively to prevent cardiovascular diseases in MHD patients. BIS is useful to assess hydration status in MHD patients. Hippokratia 2015; 19 (4): 324-331.

  9. Nontraditional factors influencing the quality of life of hemodialysis patients

    Directory of Open Access Journals (Sweden)

    Diana-Cristina Varela

    2014-06-01

    Full Text Available Introduction: The prevalence of CKD patients in advanced stages with dialysis requirement continues to grow. A goal for the medical team, the patient and their caregivers is to provide a treatment that offers an impact on the prognosis and quality of life (QOL. Methods: In 100 patients with CKD on hemodialysis, randomized assigned, the quality of life by SF-36 was assessed, it was evaluated the functional capacity using the Karnofsky, ability to perform basic tasks of daily life through the index Barthel, presence of depression using the Beck test, family functioning through family APGAR, cognitive state through Minimental and presence of comorbidities using the Charlson index correlated with the sum of physical components (PCS and mental components (MCS of the SF-36 in patients in two renal units in Medellín and Bogotá, Colombia. Results: A decrease in QOL in the physical components (PCS Mental components (MCS regarding the general population. A significant correlation between low PCS and diabetes mellitus (-16 p=0.008 95% CI 2.49 was found. Low MCS showed relation with PTH (p=0.046 95% CI 0.000-0.014, Karnofsky index (p=0.034 95% CI 0.244 to 5.984 and Beck depression test (p=0.000 95% CI -13.606 to 6.253. Conclusions: The QOL of hemodialysis patients is affected with more impact on PCS, there is significant relationship between MCS with functional status and depression. To improve QOL in hemodialysis patients, non traditionally-measured variables should be measured and monitored and the therapeutic focus should be optimized addressed to physical rehabilitation, nutritional, functional and psychological state.

  10. Cutaneous manifestations in patients with chronic renal failure on hemodialysis

    Directory of Open Access Journals (Sweden)

    Udayakumar P

    2006-01-01

    Full Text Available Background: Chronic renal failure (CRF presents with an array of cutaneous manifestations. Newer changes are being described since the advent of hemodialysis, which prolongs the life expectancy, giving time for these changes to manifest. Aim: The aim of this study was to evaluate the prevalence of dermatologic problems among patients with chronic renal failure (CRF undergoing hemodialysis. Methods: One hundred patients with CRF on hemodialysis were examined for cutaneous changes. Results: Eighty-two per cent patients complained of some skin problem. However, on examination, all patients had at least one skin lesion attributable to CRF. The most prevalent finding was xerosis (79%, followed by pallor (60%, pruritus (53% and cutaneous pigmentation (43%. Other cutaneous manifestations included Kyrle′s disease (21%; fungal (30%, bacterial (13% and viral (12% infections; uremic frost (3%; purpura (9%; gynecomastia (1%; and dermatitis (2%. The nail changes included half and half nail (21%, koilonychia (18%, onychomycosis (19%, subungual hyperkeratosis (12%, onycholysis (10%, splinter hemorrhages (5%, Mees′ lines (7%, Muehrcke′s lines (5% and Beau′s lines (2%. Hair changes included sparse body hair (30%, sparse scalp hair (11% and brittle and lusterless hair (16%. Oral changes included macroglossia with teeth markings (35%, xerostomia (31%, ulcerative stomatitis (29%, angular cheilitis (12% and uremic breath (8%. Some rare manifestations of CRF like uremic frost, gynecomastia and pseudo-Kaposi′s sarcoma were also observed. Conclusions: CRF is associated with a complex array of cutaneous manifestations caused either by the disease or by treatment. The commonest are xerosis and pruritus and the early recognition of cutaneous signs can relieve suffering and decrease morbidity.

  11. Cost-Effectiveness of Maintenance Hemodialysis in Japan.

    Science.gov (United States)

    Takura, Tomoyuki; Nakanishi, Takeshi; Kawanishi, Hideki; Nitta, Kosaku; Akizawa, Tadao; Hiramatsu, Makoto; Kawasaki, Tadayuki; Kukita, Kazutaka; Soejima, Hidehisa; Hirakata, Hideki; Yoshida, Toyohiko; Miyamoto, Takashi; Takahashi, Susumu

    2015-10-01

    The cost-effectiveness according to primary disease or dialysis duration has never been analyzed with respect to maintenance hemodialysis (MHD). Study candidates were > 20 years of age and had received hemodialysis for at least 6 months. Hemodialysis patients were prospectively observed for 36 months, and patient utility was assessed based on the Euro-QOL 5-dimensions (EQ-5D), from which the quality adjusted life years (QALYs) were estimated. Medical costs were calculated based on medical service fees. The cost-effectiveness defined as the incremental cost utility ratio (ICUR) was analyzed from a social perspective. A total of 29 patients (mean age; 59.9 ± 13.1 years) undergoing 437 dialysis sessions were analyzed. Utility based upon the EQ-5D score was 0.75 ± 0.21, and the estimated total medical cost for one year of MHD treatment was 4.52 ± 0.88 US$10 000. ICUR was 6.88 ± 4.47 US$10 000/QALY on average, and when comparing ICUR based on the causes of kidney failure, the value for diabetic nephropathy was found to be higher than that for glomerulonephritis (8.17 ± 6.28 vs. 6.82 ± 4.07). ICUR after 36 months observation increased mainly in the patients below 65 years of age (All; P < 0.05, <65; P < 0.01, 65≤; not significant). MHD is a treatment that could improve the socioeconomic state of elderly patients with end-stage kidney disease (ESKD), but the ICUR for diabetic nephropathy was higher than that for glomerulonephritis. © 2015 International Society for Apheresis, Japanese Society for Apheresis, and Japanese Society for Dialysis Therapy.

  12. The spectrum of bone disease in Jordanian hemodialysis patients

    International Nuclear Information System (INIS)

    Younes, Nidal A.; Al-Mansour, M.; Sroujieh, Ahmad S.; Wahbeh, A.; Ailabouni, W.; Hamzah, Y.; Mahafzah, W.

    2006-01-01

    To evaluate the spectrum of mineral abnormalities and bone disease (BD) in hemodialysis patients at Jordan University Hospital (JUH), Amman, Jordan. A cross-sectional study was conducted among 63 patients (38 males and 25 females), mean age 44.19 years (range 17-76 years), with chronic kidney disease (CKD) on regular hemodialysis at JUH between November 2004 and April 2005. All patients have undergone complete blood count, chemistry profile, alkaline phosphatase, serum albumin, intact parathyroid hormone (iPTH) and plain x-rays. Bone disorders were identified in 45 patients on x-rays (70%). Osteopenia was found in 43 patients (68.3%), subperiosteal resorption in 24 patients (38.3%) and metastatic calcification in 22 patients (35%). Hypocalcemia was found in 28.6% and hypercalcemia in 7.9%. All patients were taking calcium carbonate, and 55.5% of patients were on vitamin D supplements. The calcium levels in 63.5% and the phosphorus levels in 50.8% of patients were within the recommended guidelines of the National Kidney Foundation Kidney Disease Outcomes Quality Initiative (K/DOQI). Serum i-PTH level was above 300 pg/ml high turnover bone disease in 24.6% of patients, 21.3% had iPTH of 150-300 pg/ml target, and 44.3% had i-PTH levels below 100 pg/mL suggesting a dynamic bone disease. Patients with severe bone disease had a statistically significant higher iPTH levels (p<0.005). Bone disease and mineral abnormalities are common in hemodialysis patients at JUH. Earlier detection of bone disease and better overall management strategy may reduce the frequency and severity of bone disease in CKD patients in Jordan. (author)

  13. Methylenetetrahy-drofolate Reductase Gene Polymorphism in Patients Receiving Hemodialysis

    Directory of Open Access Journals (Sweden)

    Ermina Kiseljaković

    2010-04-01

    Full Text Available Methylenetetrahydrofolate Reductase (MTHFR is key enzyme in metabolism of homocysteine. Homozygotes for mutation (TT genotype have hyperhomocysteinemia, risk factor for atherosclerosis development. The aim of the study was to find out distribution of genotype frequencies of C677T MTHFR among patients on maintenance hemodialysis. Possible association of alleles and genotypes of C677T polymorphism of the MTHFR gene with age of onset, duration of dialysis and cause of kidney failure was studied also. Cross-sectional study includes 80 patients from Clinic of Hemodialysis KUCS in Sarajevo. In order to perform genotyping, isolated DNA was analyzed by RFLP-PCR and gel-electrophoresis. From total of 80 patients, 42.5% (n=24 were female, 57.5% (n=46 were male, mean age 54.59±1.78 years and duration of dialysis 79.92±6.32 months. Genotype distribution was: CC 51.2% (n=41, CT 37.5% (n=30 and TT 11.2% (n=9. Patients with wild-type genotype have longer duration of dialysis in month (87.1 ± 63.93 comparing to TT genotype patients (67.06 ± 39.3, with no statistical significance. T allele frequency was significantly higher in group of vascular and congenital cause of kidney failure (Pearson X2 =6.049, P<0.05 comparing to inflammation etiology group. Genotype distribution results are within the results other studies in Europe. Obtained results indicate that C677T polymorphism is not associated with onset, duration and cause of kidney failure in our hemodialysis population. There is an association of T allele of the MTHFR gene and vascular and congenital cause kidney failure.

  14. Assessment of adequacy of hemodialysis dose at a Palestinian hospital

    Directory of Open Access Journals (Sweden)

    Heba Adas

    2014-01-01

    Full Text Available Adequacy of hemodialysis improves patient survival, quality of life and biochemical outcomes and minimizes disease complications and hospitalizations. This study was an observational cross-sectional study that was conducted in July 2012. Blood tests, weight and blood pressure were measured before and after hemodialysis. Single-pool Kt/V and urea reduction ratio (URR were calculated. The targets based on the National Kidney Foundation Disease Outcomes Quality Initiative (KDOQI Clinical Practice Guidelines were Kt/V ≥ 1.2 and URR ≥ 65%. Of the 64 patients, 41 (64.1% were males. The mean age of the patients was 58.13 ± 17.2 years. The mean body mass index (BMI was 25.04 ± 5.01 kg/m 2 . The mean Kt/V and URR were 1.06 ± 0.05 and 54.4 ± 19.3, respectively. There was no significant difference between men and women (1.06 ± 0.47 versus 1.04 ± 0.55, P = 0.863 and (54.7 ± 19.59 versus 53.81 ± 19.17, P = 0.296. Only 25 (39.1% patients achieved the Kt/V goal and only 22 (34.4% had target URR, and there was no significant association between hemodialysis adequacy and any of the variables such as sex, age, presence of chronic diseases or BMI. Serum potassium levels post-dialysis were significantly lower in patients who reached the target Kt/V (mean = 3.44 ± 0.48 versus 3.88 ± 0.48, P = 0.001. Most patients were inadequately dialyzed and a large percentage of the patients did not attain the targets. Attempts to achieve the desired goals are necessary. It is important to calculate Kt/V or URR and individualize the dialysis doses for each patient.

  15. Validating Appetite Assessment Tools among Patients Receiving Hemodialysis

    Science.gov (United States)

    Molfino, Alessio; Kaysen, George A.; Chertow, Glenn M.; Doyle, Julie; Delgado, Cynthia; Dwyer, Tjien; Laviano, Alessandro; Fanelli, Filippo Rossi; Johansen, Kirsten L.

    2016-01-01

    Objective To test the performance of appetite assessment tools among patients receiving hemodialysis. Design Cross-sectional. Setting Seven dialysis facilities in Northern California. Subjects 221 patients receiving hemodialysis. Intervention We assessed five appetite assessment tools [self-assessment of appetite, subjective assessment of appetite, visual analogue scale (VAS), Functional Assessment of Anorexia/Cachexia Therapy (FAACT) score and the Anorexia Questionnaire (AQ)]. Main outcome measures Reported food intake, normalized protein catabolic rate (nPCR), and change in body weight were used as criterion measures, and we assessed associations among the appetite tools and biomarkers associated with nutrition and inflammation. Patients were asked to report their appetite and the percentage of food eaten (from 0% to 100%) during the last meal compared to usual intake. Results Fifty-eight (26%) patients reported food intake ≤50% (defined as poor appetite). The prevalence of anorexia was 12% by self-assessment of appetite, 6% by subjective assessment of appetite, 24% by VAS, 17% by FAACT score, and 12% by AQ. All tools were significantly associated with food intake ≤50% (panorexic patients based on the VAS (1.1 ± 0.3 vs 1.2 ± 0.3, p=0.03). Ln IL-6 correlated inversely with food intake (p=0.03), but neither IL-6 nor CRP correlated with any of the appetite tools. Furthermore, only the self-assessment of appetite was significantly associated with serum albumin (p=0.02), prealbumin (p=0.02) and adiponectin concentrations (p=0.03). Conclusions Alternative appetite assessment tools yielded widely different estimates of the prevalence of anorexia in hemodialysis. When considering self-reported food intake as the criterion standard for anorexia, the FAACT score and VAS discriminated patients reasonably well. PMID:26522141

  16. Correlation of nutritional status and food intake in hemodialysis patients.

    Science.gov (United States)

    Morais, Alvaro A C; Silva, Maria A T; Faintuch, Joel; Vidigal, Erica J; Costa, Rozilene A; Lyrio, Daniele C; Trindade, Celia R; Pitanga, Karoline K

    2005-06-01

    Patients in end-stage renal disease often suffer from poor appetite, various comorbidities, and dietary restrictions. Despite regular hemodialysis, nutritional imbalances are frequently reported. Aiming to correlate nutritional status with food ingestion, a prospective study was done in an outpatient group. Stable patients undergoing chronic hemodialysis for at least 3 months (n=44) were investigated by dietary recall and standard anthropometric, biochemical, and bioimpedance determinations, including subjective and objective global assessment. The mean age of the group was 47.0+/-16.9 years, and 63.6% were men. Body mass index was 22.2+/-3.9 kg/m2 (mean+/-SD), calorie intake was 1471+/-601 kcal/day (20.7+/-6.7 kcal/kg/day), and protein ingestion was 74.3+/-16.6 g protein/day (1.2 g/kg/day). Dietary and clinical findings were correlated with nutritional indices by linear regression analysis. Malnutrition estimated by subjective global assessment was very common (>90%), despite the fact that body mass index and serum albumin were within an acceptable range in the majority of the population. Objective global assessment yielded roughly comparable numerical findings, with 6.8% being well nourished, 61.4% at nutritional risk or lightly undernourished, 29.6% moderately malnourished, and 2.3% severely malnourished. Total calorie intake was devoid of associations, but protein, carbohydrate, and lipid input positively correlated with triceps skinfold (P=.02). Lipid ingestion was the only marker directly associated with arm circumference, and it correlated with body mass index, as well as with total body fat (bioimpedance analysis) (Pprotein or total energy; 3) Despite its shortcomings, dietary recall was useful in the assessment of hemodialysis patients.

  17. Visual impairment in elderly patients receiving long-term hemodialysis.

    Science.gov (United States)

    Chiu, Ernest; Markowitz, Samuel N; Cook, Wendy L; Jassal, Sarbjit V

    2008-12-01

    Visual impairments are associated with low quality of life, impairment of daily activities, and accidental falls. As dialysis patients are increasingly older and more disabled, we sought to assess visual impairments within an elderly dialysis population. Based on data from the general population, we hypothesized that more than 30% of dialysis patients 65 years or older would have visual impairment manifested by loss of visual acuity, depth perception, or contrast sensitivity. Single-center cross-sectional study. Patients established on hemodialysis therapy, age older than 65 years. The proportion of elderly hemodialysis patients with impairments in visual acuity, contrast sensitivity, and depth perception. Lighthouse Near Visual Acuity Test, Lea Screener contrast sensitivity test (Goodlite, MA, USA), Titmus Stereotest, Folstein Mini-Mental Status Examination. 152 of 159 patients (95.6%) had visual acuity levels less than age-expected values. Under North American (American Medical Association, edition 4) guidelines for disability compensation, 62 patients (39.0%) fulfilled criteria for legal blindness. Sixty patients (37.0%) had poor contrast sensitivity and 48 (30.6%) failed the Housefly component of the Titmus Stereotest. Failing the Housefly component was associated with a lower Folstein Mini-Mental Status Examination score (23.4 +/- 4.2 v 25.1 +/- 3.5; P = 0.01). This study is limited by the cross-sectional study design and abbreviated test protocol used for vision assessment. Results of this study suggest that elderly hemodialysis patients have a high frequency of visual impairment. Formal low vision assessment and low vision rehabilitation may be useful in elderly dialysis patients. Additional study is required to determine whether the absence of depth perception in this patient group is associated with deteriorating cognitive function.

  18. Altered taste perception and nutritional status among hemodialysis patients.

    Science.gov (United States)

    Lynch, Katherine E; Lynch, Rebecca; Curhan, Gary C; Brunelli, Steven M

    2013-07-01

    The objective of this study was to examine the association between altered taste perception and nutritional status among hemodialysis patients. We performed a post hoc analysis of data from the Hemodialysis study (n = 1,745). Taste perception was assessed at baseline and then updated annually using an item from a quality of life survey that asked "During the past 4 weeks, to what extent were you bothered by loss of taste?" Responses were categorized as normal taste perception if subjects answered "not at all" or altered taste perception if they reported any degree of bother. Time-updated logistic regression models were used to evaluate predictors of altered taste perception. Time-updated linear regression models were used to examine the association between altered taste perception and indices of nutritional status. Multivariable proportional hazards and Poisson models were used to assess association between altered taste perception and mortality and hospitalization, respectively. At baseline, 34.6% reported altered taste perception, which was associated with poorer baseline nutritional status. On time-updated analysis, altered taste perception was associated with a persistently higher proportion of subjects requiring enteral nutritional supplements and lower serum albumin, serum creatinine, normalized protein catabolic rate, protein intake, sodium intake, and mid-arm muscle circumference. Altered taste perception at baseline was independently associated with increased all-cause mortality: adjusted hazard ratio (95% confidence interval) of 1.17 (1.01-1.37), although not with increased rate of hospitalization. Altered taste perception was common among prevalent hemodialysis patients and was independently associated with poorer indices of nutritional status and increased all-cause mortality. Copyright © 2013 National Kidney Foundation, Inc. Published by Elsevier Inc. All rights reserved.

  19. BODY COMPOSITION IN HEMODIALYSIS AND PERITONEAL DIALYSIS PATIENTS

    Directory of Open Access Journals (Sweden)

    Nam Ho Kim

    2012-06-01

    Full Text Available Bioimpedance analysis is a reliable technique for determining post dialysis target weight. Using this technique, we can understand body fluid status easier and conveniently. Moreover this technique can be used for check nutrition status and nutritional status of dialysis patients. We compared the body fluid status and nutrition status between hemodialysis (HD patients and peritoneal dialysis (PD patients by BCM (Body composition monitor technique. We studied 48 (30 males and 18 females PD patients, 21 (10 males and 11 females HD patients. Body composition monitoring (BCM, Fesenitus Medical Care, Germany was used as a tool for the analysis of bioimpedance. Extracellular water, Total body water, Intracellular water, Overhydration, E/I, Lean tissue mass, Fat Tissue mass was measured and those results were compared between two groups. HD patients were more hydrated than PD patients (61.9% vs. 35.4% and nutritional status such as LTI was poorer than peritoneal dialysis patients (11.7±1.7 vs. 15.3±2.6. Although total body water is more abundant in peritoneal patients (29.4±5.5L vs. 35.9±6.2L, Extracellular water and intracellular water ratio was relatively higher in Hemodialysis patients (E/I 0.98±0.13 vs. 0.87±0.12. The nutrition status was better in PD patients by comparing the percent of lean tissue mass (LTM% between two groups (LTM% 52.1±10.6% vs. 66.8±11.3. In conclusions, Hemodialysis patients were more hydrated with poorer nutrition status than peritoneal dialysis patients, but, due to the significant difference of age between two groups, further study should be required.

  20. Metabolic Syndrome and Physical Activity in Hemodialysis Patients

    Directory of Open Access Journals (Sweden)

    derya atik

    2014-06-01

    Full Text Available Purpose: This descriptive study was carried out to reveal the level of physical activity in patients who receive hemodialysis due to chronic kidney failure and to identify its relationship with the prevalence of metabolic syndrome (MetS. Material and method: The study was conducted with 55 patients at the hemodialysis units of Alanya State Hospital and Private Alanya Anadolu Hospital between 10 and 30 June 2013. The study data were collected using the National Cholesterol Education Program, the Adult Treatment Panel III (NCEP-ATP III, a data collection form containing Metabolic Syndrome Diagnosis Criteria, and the International Physical Activity Questionnaire (IPAQ. The data were analyzed using arithmetic mean +/- standard deviation (SD, number and percentage distributions, independent sample t test, crosstabs, One Way Anova, and Pearson and #8217;s Correlation Analysis. Conclusion and suggestions: It was found that 41.8% of the patients were between 50 and 65 years of age, the majority of them were male (58.2%, hemodialysis had been administered to 69.1% of them for at least 36 months, and 50.9% of them met three and more of the MetS criteria. There was no statistically significant relationship between MetS and physical activity levels, but the length of physical activity was longer in those who did not meet the MetS diagnosis criteria (p>0.05. An increase in sedentary time raised the MetS criteria (p<0.05. Conclusion: Nearly 1/2 of the patients were at risk of MetS. Physical activity level being statistically ineffective on MetS can be associated with low physical activity level and longer sedentary time. It can be said that being completely sedentary increases BMI and therefore MetS. The study can be repeated on different samples and the results can be compared. [J Contemp Med 2014; 4(2.000: 69-75

  1. Nonocclusive Mesenteric Ischemia in a Patient on Maintenance Hemodialysis

    Science.gov (United States)

    Han, Sang Youb; Kwon, Young Joo; Shin, Jin Ho; Pyo, Heui Jung; Kim, Ae Ree

    2000-01-01

    Nonocclusive mesenteric ischemia (NOMI) is known to occupy about 25% to 60% of intestinal infarction. NOMI has been reported to be responsible for 9% of the deaths in the dialysis population and the postulated causes of NOMI include intradialytic hypotension, atherosclerosis and medications, such as diuretics, digitalis and vasopressors. Clinical manifestations, such as fever, diarrhea and leukocytosis, are nonspecific, which makes early diagnosis of NOMI very difficult. Case: A 66-year-old woman on maintenance hemodialysis for 5 years was admitted with syncope, abdominal pain and chilly sensation. Since 7 days prior to admission, blood pressure on the supine position during hemodialysis had frequently fallen to 80/50 mmHg. Four days later, she complained of progressive abdominal pain. Rebound tenderness and leukocytosis (WBC 13900/mm3) with left shift were noted. Stool examination was positive for occult blood. Abdominal CT scan showed a distended gall bladder with sludge. Under the impression of acalculous cholecystitis, she was operated on. Surgical and pathologic findings of colon colon were compatible with NOMI. Because of recurrent intradialytic hypotension, we started midodrine 2.5 mg just before hemodialysis and increased the dose up to 7.5 mg. After midodrine therapy, blood pressure during dialysis became stable and the symptoms associated with hypotension did not recur. Conclusion: As NOMI may occur within several hours or days after an intradialytic hypotensive episode, abdominal pain should be carefully observed and NOMI should be considered as a differential diagnosis. In addition, we suggest that midodrine be considered to prevent intradialytic hypotensive episodes. PMID:10714097

  2. Synthetic Aperture Compound Imaging

    DEFF Research Database (Denmark)

    Hansen, Jens Munk

    Medical ultrasound imaging is used for many purposes, e.g. for localizing and classifying cysts, lesions, and other processes. Almost any mass is first observed using B-mode imaging and later classified using e.g. color flow, strain, or attenuation imaging. It is therefore important that the B......, it is demonstrated through theoretical considerations that the compound effect achieved is close to a theoretical maximum for the amount of compounding attainable and using a -pitch convex array transducer, the first in-vivo images are created. The computational demands for an implementation are massive...... and the limiting factor is the amount of memory IO resources available. An equally high demand for memory throughput is found in the computer gaming industry, where a large part of the processing takes place on the graphics processing unit (GPU). Using the GPU, a framework for synthetic aperture imaging...

  3. Transionospheric synthetic aperture imaging

    CERN Document Server

    Gilman, Mikhail; Tsynkov, Semyon

    2017-01-01

    This landmark monograph presents the most recent mathematical developments in the analysis of ionospheric distortions of SAR images and offers innovative new strategies for their mitigation. As a prerequisite to addressing these topics, the book also discusses the radar ambiguity theory as it applies to synthetic aperture imaging and the propagation of radio waves through the ionospheric plasma, including the anisotropic and turbulent cases. In addition, it covers a host of related subjects, such as the mathematical modeling of extended radar targets (as opposed to point-wise targets) and the scattering of radio waves off those targets, as well as the theoretical analysis of the start-stop approximation, which is used routinely in SAR signal processing but often without proper justification. The mathematics in this volume is clean and rigorous – no assumptions are hidden or ambiguously stated. The resulting work is truly interdisciplinary, providing both a comprehensive and thorough exposition of the field,...

  4. Synthetic antibiofilm peptides.

    Science.gov (United States)

    de la Fuente-Núñez, César; Cardoso, Marlon Henrique; de Souza Cândido, Elizabete; Franco, Octavio Luiz; Hancock, Robert E W

    2016-05-01

    Bacteria predominantly exist as multicellular aggregates known as biofilms that are associated with at least two thirds of all infections and exhibit increased adaptive resistance to conventional antibiotic therapies. Therefore, biofilms are major contributors to the global health problem of antibiotic resistance, and novel approaches to counter them are urgently needed. Small molecules of the innate immune system called host defense peptides (HDPs) have emerged as promising templates for the design of potent, broad-spectrum antibiofilm agents. Here, we review recent developments in the new field of synthetic antibiofilm peptides, including mechanistic insights, synergistic interactions with available antibiotics, and their potential as novel antimicrobials against persistent infections caused by biofilms. This article is part of a Special Issue entitled: Antimicrobial peptides edited by Karl Lohner and Kai Hilpert. Copyright © 2015 Elsevier B.V. All rights reserved.

  5. [Pulmonary hypertension in hemodialysis patients: Prevalence and associated factors].

    Science.gov (United States)

    Reque, Javier; Quiroga, Borja; Ruiz, Caridad; Villaverde, Maria Teresa; Vega, Almudena; Abad, Soraya; Panizo, Nayara; López-Gómez, J Manuel

    2016-02-19

    Pulmonary hypertension (PH) is a progressive disorder that can be caused by several underlying conditions or an intrinsic alteration of the pulmonary vasculature. Chronic increased pressure in the pulmonary vasculature leads to changes in the architecture of the vessels that can perpetuate PH and produce right ventricular dysfunction. These structural and functional alterations can decrease survival and quality of life of patients on hemodialysis; however, there is a lack of evidence about this problem in this population. The aim of this study is to establish the prevalence of PH in patients on hemodialysis and its association with specific factors related to this patient population. We included 202 prevalent patients on hemodialysis for at least 6 months and who were clinically stable. We collected demographic data, routine laboratory parameters and data of 2D Doppler-echocardiography. PH was defined as a systolic pulmonary artery pressure (SPAP) estimated by Doppler ultrasound above 35mmHg. Hydration status was assessed by determining the plasma concentration of N-terminal pro brain natriuretic peptide (Nt-proBNP). PH prevalence was 37.1% (75 patients). The average SPAP in the entire study population was 32±12mmHg and in the group with PH it was 45±11mmHg. We found a direct and statistically significant correlation between the presence of PH and age (P=.001), time on renal replacement therapy (P=.04), the presence of systolic dysfunction (P=.007), diastolic dysfunction (P= 01), mitral valve disease (P=.01) and double mitral and aortic disease (P=.007). Volume overload was closely associated with PH, as demonstrated by the correlation between the SPAP and Nt-proBNP levels (P=.001). We conclude that prevalence of PH in hemodialysis patients is high. And one of the most important associated factors is volume overload. More studies are needed to establish the impact of PH on morbidity and mortality of patients and to assess whether a better volume control improves

  6. Clinical course of uremic neuropathy in long-term hemodialysis

    OpenAIRE

    Jurčić, Dragan; Bilić, Ante; Schwarz, Dragan; Oršanić, Dubravka; Gabrić, Maruška; Špoljarić, Ljubica; Mihanović, Mate

    2008-01-01

    One hundred and thirty-one patients on long-term hemodialysis were examined for the presence of clinical symptoms and signs, and for the effects of dialytic age, age and sex on uremic neuropathy. According to dialysis age, the patients were divided into three subgroups: low dialysis age, 10 years of dialysis (n=34). Two patient subgroups were differentiated according to mean age of 53.2 years: younger (n=57) and older (n=74). Clinical grading of uremic neuropathy was based on Niel...

  7. Salivary function in patients with chronic renal failure undergoing hemodialysis

    Energy Technology Data Exchange (ETDEWEB)

    Kaya, M.; Cermik, T.F.; Uestuen, F.; Sen, S.; Berkarda, S. [Trakya Univ., Edirne (Turkey). Medical Faculty

    2002-04-01

    The aim of this study was to evaluate the changes in salivary gland function in patients with chronic renal failure (CRF) undergoing hemodialysis. The group consisted of 23 patients with CRF (13 female, 10 male; mean age: 40{+-}13 yr) and 14 healthy control subjects (mean age: 40{+-}13 yr). All underwent dynamic salivary gland scintigraphy with gustatory stimulation. After intravenous administration of {sup 99m}Tc pertechnetate, first, perfusion images at 2 seconds per frame were acquired for 1 minute, then dynamic images at 1 minute per frame were acquired for 45 minutes. At 30 minutes after injection , 10 ml lemon juice was given for 15 minutes as a gustatory stimulus. We obtained time-activity curves derived from regions of interest centered over the four major salivary glands. The following functional indices were calculated for each gland: the time of maximum radioactivity (T{sub max}) for the prestimulated period, the time of minimum radioactivity (T{sub min}), as an indicator of velocity of secretion after stimulation, and the Lem E{sub 5}% value as an indicator of the secretion function. When the patients with CRF undergoing hemodialysis were compared to the controls, there were statistically significant differences in T{sub max}, T{sub min} and Lem E{sub 5}% values for bilateral parotid glands, and T{sub min} values for bilateral submandibular glands (p<0.05), there were no statistically significant differences in T{sub max} and Lem E{sub 5}% values for bilateral submandibular glands. There were also significant differences in T{sub max} and Lem E{sub 5}% values for bilateral parotid glands between mild oral problems and severe oral problems in patients with CRF (undergoing hemodialysis). In this study, prolonged T{sub max} and T{sub min} values, and decreased Lem E{sub 5}% values for parotid glands and prolonged T{sub min} values for submandibular glands on salivary scintigraphy pointed out decreased parenchymatous and excretory function in patients with

  8. N-terminal pro brain natriuretic peptide as a cardiac biomarker in Japanese hemodialysis patients.

    Science.gov (United States)

    Shimizu, Minako; Doi, Shigehiro; Nakashima, Ayumu; Naito, Takayuki; Masaki, Takao

    2018-03-01

    This study examined the clinical significance of N-terminal pro brain natriuretic peptide level as a cardiac marker in Japanese hemodialysis patients. This was a multicenter cross-sectional study involving 1428 Japanese hemodialysis patients. Ultrasonic cardiography data at post-hemodialysis were obtained from 395 patients. We examined whether serum N-terminal pro brain natriuretic peptide levels were associated with cardiac parameters and assessed cut-off values and investigated factors associated with a reduced ratio of N-terminal pro brain natriuretic peptide levels pre- and post-hemodialysis. Multivariate logistic regression analysis showed that pre- and post-hemodialysis N-terminal pro brain natriuretic peptide levels were associated with left ventricular hypertrophy on electrocardiogram (odds ratio: 3.10; p N-terminal pro brain natriuretic peptide levels were also significantly associated with ejection fraction on urine chorionic gonadotrophin (ultrasonic cardiography; odds ratio: 35.83; p N-terminal pro brain natriuretic peptide reduction ratio during a hemodialysis session correlated with Kt/V, membrane area, membrane type, modality, body weight gain ratio, treatment time, and ultrafiltration rate with multiple linear regression ( R: 0.53; p N-terminal pro brain natriuretic peptide are associated with the presence of left ventricular hypertrophy in this population. The post-hemodialysis N-terminal pro brain natriuretic peptide level is a useful marker for systolic dysfunction.

  9. Echocardiographic study of cardiac dysfunction in patients of chronic kidney disease on hemodialysis

    International Nuclear Information System (INIS)

    Arshi, S.; Butt, G.U.D.; Mian, F.A.

    2016-01-01

    Objective: The objective of this study was to see echocardiographic findings of cardiac dysfunction in patients of chronic kidney disease (CKD) on hemodialysis. Study Design: Comparative cross sectional study. Place and Duration of Study: Department of nephrology, Pakistan Institute of Medical Sciences. Islamabad from September 2014 to February 2015. Patients and Methods: One hundred patients of either gender were included in this study. Fifty patients of chronic kidney disease stage V on hemodialysis were taken for echocardiography and fifty were normal. Echocardiography was done for cardiac dysfunction. Systolic function was measured by ejection fraction (EF) and fractional shortening (FS). Diastolic function was measured by E/A ratio. Results: Out of 100 patients included in the study, 50 patients were on hemodialysis and 50 were control. Left ventricular end systolic and end diastolic volumes were higher in patients on hemodialysis than controls as well as left atrial enlargement and inter ventricular septum which was statistically significant. Ejection fraction, although normal and fractional shortening decreased in patients on hemodialysis (p<0.05). Diastolic dysfunction was present in 36 patients on hemodialysis, while absent in the control group. Conclusion: Patients with chronic kidney disease on hemodialysis have higher prevalence of cardiac dysfunction. (author)

  10. Molecular architecture requirements for polymer-grafted lignin superplasticizers.

    Science.gov (United States)

    Gupta, Chetali; Sverdlove, Madeline J; Washburn, Newell R

    2015-04-07

    Superplasticizers are a class of anionic polymer dispersants used to inhibit aggregation in hydraulic cement, lowering the yield stress of cement pastes to improve workability and reduce water requirements. The plant-derived biopolymer lignin is commonly used as a low-cost/low-performance plasticizer, but attempts to improve its effects on cement rheology through copolymerization with synthetic monomers have not led to significant improvements. Here we demonstrate that kraft lignin can form the basis for high-performance superplasticizers in hydraulic cement, but the molecular architecture must be based on a lignin core with a synthetic-polymer corona that can be produced via controlled radical polymerization. Using slump tests of ordinary Portland cement pastes, we show that polyacrylamide-grafted lignin prepared via reversible addition-fragmentation chain transfer polymerization can reduce the yield stress of cement paste to similar levels as a leading commercial polycarboxylate ether superplasticizer at concentrations ten-fold lower, although the lignin material produced via controlled radical polymerization does not appear to reduce the dynamic viscosity of cement paste as effectively as the polycarboxylate superplasticizer, despite having a similar affinity for the individual mineral components of ordinary Portland cement. In contrast, polyacrylamide copolymerized with a methacrylated kraft lignin via conventional free radical polymerization having a similar overall composition did not reduce the yield stress or the viscosity of cement pastes. While further work is required to elucidate the mechanism of this effect, these results indicate that controlling the architecture of polymer-grafted lignin can significantly enhance its performance as a superplasticizer for cement.

  11. Synthetic Effect of Vivid Shark Skin and Polymer Additive on Drag Reduction Reinforcement

    OpenAIRE

    Huawei Chen; Xin Zhang; Da Che; Deyuan Zhang; Xiang Li; Yuanyue Li

    2014-01-01

    Natural shark skin has a well-demonstrated drag reduction function, which is mainly owing to its microscopic structure and mucus on the body surface. In order to improve drag reduction, it is necessary to integrate microscopic drag reduction structure and drag reduction agent. In this study, two hybrid approaches to synthetically combine vivid shark skin and polymer additive, namely, long-chain grafting and controllable polymer diffusion, were proposed and attempted to mimic such hierarchical...

  12. Modified Mininutritional Assessment can effectively assess the nutritional status of patients on hemodialysis.

    Science.gov (United States)

    Tsai, Alan C; Lu, Shu-Jen; Chang, Tsui-Lan

    2009-09-01

    We sought to determine whether the MNA (Mininutritional Assessment) would be an effective tool for assessing the nutritional status of patients undergoing hemodialysis. Purposive sampling. Two hospital-managed hemodialysis centers in central Taiwan. Subjects were 95 ambulatory patients older than 40 years without acute diseases or infections who had received hemodialysis treatment at the center for longer than 30 days. Each subject was interviewed with a structured questionnaire to elicit basic personal data and health- and lifestyle-related information and answered questions on the Council on Nutrition Appetite Questionnaire and MNA. Serum biochemical data were obtained from their routine measurement. The nutritional status of each subject was graded with two modified MNA versions. MNA-TI adopted population-specific anthropometric cut-points, and MNA-TII further had the body mass index question deleted from the scale and question scores adjusted but maintained the same 30 total points. Based on the strength of correlation with the key nutrition-related parameters including appetite status, serum creatinine, percent weight loss, hospital length of stay, number of prescribed drugs, and hemodialysis time, both modified MNA versions reflected the nutritional status of Taiwanese hemodialysis patients better than the Council on Nutrition Appetite Questionnaire. Serum albumin did not reflect nutritional status well in these hemodialysis patients. MNA-TI predicted 26.4% and MNA-TII predicted 29.5% of hemodialysis patients were either malnourished or at risk of malnutrition. Both versions of the modified MNA are effective in assessing the nutritional status of hemodialysis patients. MNA-TII without body mass index is a significant improvement for hemodialysis patients because body weights fluctuate significantly between dialysis sessions.

  13. Autogenous femoral head as grafting material for mandibular augmentation

    NARCIS (Netherlands)

    Vos, M. D.; Raghoebar, G. M.; van der Wal, J. E.; Kalk, W. W. I.; Vissink, A.

    2009-01-01

    Bone grafting is commonly used for augmentation of the atrophic edentulous maxilla and mandible. Although bone substitutes and allogeneic frozen bone grafts have been applied successfully, fresh autogenous bone grafts remain the 'gold standard' in maxillofacial reconstructive surgery. A disadvantage

  14. Industrial application of electron beams for grafting and vulcanization

    International Nuclear Information System (INIS)

    Keizo Makuuchi

    1994-01-01

    The topics discussed are radiation graft polymerization; industrial application of radiation grafting - ion exchange membrane for a battery separator, ammonia adsorbent, non-flammable PE (polyethylene) foam; R and D on radiation grafting, radiation vulcanization of natural rubber

  15. Improvement of polymer stability by radiation grafting

    International Nuclear Information System (INIS)

    Ranogajec, F.; Mlinac-Misak, M.

    1999-01-01

    Losses of the stabilizer due to extractability or volatility immediately affect ultimate performance of polymer product. A new approach to increase the persistence of the stabilizer in the final product is to chemically bind it to the polymer backbone. Radiation grafting or crosslinking could be an efficient method for this, when the stabilizer is polymerizable. By a mutual gamma irradiation method, photoprotector 2-hydroxy-4-(3-methacryloxy-2- hydroxy-propoxy) benzophenone (HMB) has been readily grafted to low density polyethylene (LDPE) in benzene, tetrahydrofuran and methanol solution, respectively. Surface grafting occurs in a methanol solution of stabilizer, while in benzene and tetrahydrofuran solutions of stabilizer, grafting proceeds more or less in the inner parts of the polymeric film as well. The grafted LDPE film in methanol and tetrahydrofuran (containing 1 w/w % of grafted HMB), 1 w/w % blended HMB with LDPE and nongrafted LDPE film, were all exposed to accelerated aging and natural weathering and their spectral changes, expressed by the carbonyl index, were then compared. The change of elongation at break and tensile strength were measured in the course of aging. UV stability tests on aged films and change in mechanical properties indicate a pronounced protective effect achieved by grafted stabilizer. Grafting in methanol solution appears to be an efficient photostabilization treatment and the most economical with respect to the consumption of monomer, the grafting yield being less than 0.5%. Surface grafting is an efficient photostabilization method since grafted stabilizer is chemically bound to a polymeric surface and in this way the problem of evaporation of blended stabilizers during the prolonged use of polymeric materials is eliminated. (author)

  16. High-Flux Hemodialysis Benefits Hemodialysis Patients by Reducing Serum FGF-23 Levels and Reducing Vascular Calcification.

    Science.gov (United States)

    Fu, Xiao; Cui, Qin-Qin; Ning, Jian-Ping; Fu, Shuang-Shuang; Liao, Xiao-Hua

    2015-11-11

    High- and low-flux hemodialysis (HFHD and LFHD, respectively) are dialysis procedures designed to eliminate blood toxins that accumulate in end-stage renal disease. HFHD may reduce vascular calcification by removing serum fibroblast growth factor 23 (FGF-23). However, whether HFHD is better than LFHD is still under debate. We therefore compared the efficacy of HFHD and LFHD in controlling FGF-23 and vascular calcification. Fifty hemodialysis patients were recruited and randomly treated with either HFHD or LFHD. Fasting venous blood was collected at baseline, six months, and twelve months after the treatment. We then measured levels of FGF-23, calcium, phosphorus, parathyroid hormone, and alkaline phosphatase. Further, abdominal lateral radiographs were taken to calculate aorta abdominalis calcification scores (AACs). Compared to the LFHD group, FGF-23 and AACs in the HFHD group significantly decreased after 12 months treatment (p=0.049 and p=0.002, respectively). AACs were positively correlated with FGF-23 in all patients (p=0.004), the HFHD group alone (p=0.040), and the LFHD group alone (p=0.037). We also found that older patients, patients with higher blood phosphorus levels, and higher FGF-23 levels had an increased risk of aorta abdominalis calcification (p=0.048, p=0.003, p=0.001, respectively). HFHD was more able to reduce the risk of aorta abdominalis calcification than LFHD (p=0.003). FGF-23 is an independent risk factor for the development of vascular calcification. HFHD may benefit hemodialysis patients by reducing serum FGF-23 levels and controlling vascular calcification.

  17. The Global Forum for Home Hemodialysis: a new open-source practical manual.

    Science.gov (United States)

    Marshall, Mark R; Chan, Christopher T

    2015-04-01

    Encouraging clinical outcomes from observational and randomized controlled data in the forms of frequent hemodialysis (HD) has renewed interest in home HD. However, given its benefits, home HD is relatively underutilized throughout the world. The Global Forum for Home Hemodialysis, an independent panel comprised of internationally recognized nephrologists, home HD nurses, administrators, patient advocates, and a long-time home HD patient, has convened with the intention of creating an open-source, comprehensive, practical manual that provides useful information to clinicians who are interested in implementing home HD. © 2015 International Society for Hemodialysis.

  18. Does antibiotic lock therapy prevent catheter-associated bacteremia in hemodialysis?

    Directory of Open Access Journals (Sweden)

    Macarena Jiménez

    2015-01-01

    Full Text Available Central venous catheter-related blood stream infection is a major cause of morbidity and mortality in patients with renal disease treated with hemodialysis. Antibiotic lock solutions can be effective in preventing this complication in patients with hemodialysis. Searching in Epistemonikos database, which is maintained by screening more than twenty databases, we identified eight systematic reviews including seventeen randomized trials. We combined the evidence using meta-analysis and generated a summary of findings table following the GRADE approach. We concluded that antibiotic lock solutions probably decrease catheter-related blood stream infection in hemodialysis patients.

  19. Omega-3 intake in people with epilepsy under regular hemodialysis program: here to stay

    Directory of Open Access Journals (Sweden)

    Carla Alessandra Scorza

    2013-07-01

    Full Text Available Among the many risk factors suggested for sudden unexpected death in epilepsy (SUDEP, higher frequency of seizures is a very consistent issue. Furthermore, it has been established that hemodialysis-associated seizure is a complication of the dialysis procedure. Thus, since a possible relation between cardiovascular abnormalities and SUDEP among patients with chronic renal insufficiency in regular hemodialysis program should not be neglected, we propose in this paper that omega-3 fatty acids offer opportunities for prevention of sudden cardiac death or improved treatment in people with epilepsy under the regular hemodialysis program.

  20. The effect of hemodialysis on balance measurements and risk of fall.

    Science.gov (United States)

    Erken, Ertugrul; Ozelsancak, Ruya; Sahin, Safak; Yılmaz, Emine Ece; Torun, Dilek; Leblebici, Berrin; Kuyucu, Yunus Emre; Sezer, Siren

    2016-10-01

    Patients with end-stage renal disease (ESRD) have increased risk of falls and fall-related complications. Other than aging and factors related to chronic kidney disease, treatment of hemodialysis may also contribute to this increased risk. The aim of this study was to demonstrate the impairment of balance after a session of hemodialysis with a quantitative assessment and reveal an increased fall risk that would possibly be related to treatment of hemodialysis for patients on maintenance hemodialysis. Fifty-six patients with ESRD on chronic hemodialysis program and 53 healthy individuals were involved in this study. Fall Index percentages were calculated, and fall risk categories were determined for all patients and healthy controls using Tetrax posturography device (Sunlight Medical Ltd Israel). The patient group was evaluated twice for balance, before and after a routine session of hemodialysis. Fall Index scores of healthy controls were lower than that of ESRD patients (p = 0.001). In the patient group, we found the mean Fall Index to be significantly higher at the post-dialysis assessment compared to the pre-dialysis assessment (p = 0.003). The number of patients with high risk of falling also increased at the post-dialysis assessment yet the difference did not reach significance. Fall Index was correlated with the increase in age only at the pre-dialysis balance measurement (p = 0.038). Patients with better dialysis adequacy had significantly lower Fall Index scores than the others at the pre-dialysis balance measurement (p = 0.004). The difference was not significant at the post-dialysis measurement. In the current study, we evaluated the balance of ESRD patients before and after a routine session of hemodialysis treatment. This is the first study to investigate the effect of hemodialysis on balance, using an electronic posturographic balance system. We found the Fall Index score to be significantly higher after hemodialysis, indicating a negative