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Sample records for biopsy clamp yields

  1. Unguided bronchoscopic biopsy: Does yield increase with operator experience

    Directory of Open Access Journals (Sweden)

    Tyagi Rahul

    2017-08-01

    Full Text Available Background Bronchoscopic Forceps biopsy (Endobronchial Biopsy (EBB and Trans Bronchial Lung Biopsy (TBLB are commonly performed for diagnosis in patients with endobronchial abnormalities or diffuse parenchymal involvement. As the operator gains experience his yield of various diagnostic bronchoscopic biopsies is expected to increase, however, no studies on the subject are available in literature. Aims To determine the effect of on- job experience on the yield of unguided bronchoscopic biopsies. Methods A total of 244 bronchoscopies were performed between Oct 2013 and Oct 2016. A retrospective analysis of all these bronchoscopies was undertaken. All patients who underwent biopsy were included in the study. Patients were divided into two groups with first group (Group A comprising of biopsies done between Oct 2013 to Apr 2015 and second group comprising biopsies done between May 2015 to Oct 2016 (Group B. The diagnostic yield in two groups was compared. Results Total 71 bronchoscopic biopsies were performed during Oct 2013 to Oct 2016. 36 patients were included in group A and 35 patients were included in group B. The groups were matched in demographic profile, clinical diagnosis, bronchoscopic findings and type of biopsy undertaken. The biopsy was diagnostic in 31 patient (43.6 per cent and nondiagnostic in 33 patients (46.4 per cent. There were 15 diagnostic biopsies in group A and 16 diagnostic biopsies in group B. The difference in the diagnostic biopsies between the two groups was not significant. Conclusion There was no significant impact of on job experience on diagnostic yield of biopsies. This may be due to adequate exposure during training leading to a diagnostic plateau being reached.

  2. Percutaneous core needle biopsies: The yield in spinal tuberculosis ...

    African Journals Online (AJOL)

    Background. Current recommendations for spinal tuberculosis (TB) not requiring open surgery include core needle biopsy to confirm TB and determine drug sensitivity. International figures show the positive culture yield from core needle biopsies is 50 - 83%. Objectives. To (i) assess the yield of percutaneous needle ...

  3. Image-guided pleural biopsy: diagnostic yield and complications

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    Benamore, R.E. [Department of Radiology and Department of Histopathology, Glenfield Hospital, University Hospitals of Leicester NHS Trust, Leicester (United Kingdom)]. E-mail: rachelbenamore@doctors.org.uk; Scott, K. [Department of Radiology and Department of Histopathology, Glenfield Hospital, University Hospitals of Leicester NHS Trust, Leicester (United Kingdom); Richards, C.J. [Department of Radiology and Department of Histopathology, Glenfield Hospital, University Hospitals of Leicester NHS Trust, Leicester (United Kingdom); Entwisle, J.J. [Department of Radiology and Department of Histopathology, Glenfield Hospital, University Hospitals of Leicester NHS Trust, Leicester (United Kingdom)

    2006-08-15

    Background: Pleural biopsy and cytology are standard procedures for the investigation of pleural disease. Recent medical literature has suggested that image-guided pleural biopsy shows improved sensitivity for the diagnosis of pleural malignancy, when compared with the more commonly performed reverse bevel needle biopsy such as Abrams' needle. In our centre there has been an increasing trend towards performing image-guided pleural biopsies, and to our knowledge there is no large published series documenting the complication rate and diagnostic yield. Methods: The radiology and pathology databases were searched for all image-guided [computed tomography (CT) and ultrasound (US)] pleural biopsies from January 2001 to December 2004. All imaging and histology were reviewed, and final diagnostic information about patients was obtained from the respiratory multidisciplinary team database and patient notes. A record was made of complications following biopsy, presence of pleura in the biopsy, and adequacy of tissue for histological diagnosis. Results: A total of 82 patients underwent 85 image-guided pleural biopsies over a 4-year period. 80 cases were performed under CT and five under US guidance. The rate of new pneumothorax detected by chest radiography was 4.7%. No patient required a chest drain or blood transfusion to treat complications. In 10 (12%) cases, there was inadequate tissue to reach a confident histological diagnosis and in eight (9%) of these, no pleura was present. Assuming all suspicious and inadequate biopsies are treated as benign, which is the worst case scenario, image-guided pleural biopsy has a sensitivity and specificity of 76% and 100%, respectively, for the diagnosis of malignant disease. Conclusions: Image-guided pleural biopsy is a safe procedure with few associated complications and has a higher sensitivity than previously published series for reverse cutting needle biopsy in the diagnosis of malignant pleural disease.

  4. Real-Time Magnetic Resonance Imaging Guidance Improves the Diagnostic Yield of Endomyocardial Biopsy

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    Toby Rogers, BM BCh

    2016-08-01

    Full Text Available Diagnostic yield of endomyocardial biopsy is low, particularly in disease that affects the myocardium in a nonuniform distribution. The authors hypothesized that real-time MRI guidance could improve the yield through targeted biopsy of focal myocardial pathology. They tested this hypothesis in an animal model of focal myocardial pathology using intracoronary ethanol and microspheres. The authors compared real-time MRI-guided endomyocardial biopsy in swine using a custom actively visualized MRI bioptome against x-ray–guided biopsy using a commercial bioptome by skilled operators. Real-time MRI guidance significantly increased the diagnostic yield of endomyocardial biopsy.

  5. Biopsies

    Science.gov (United States)

    ... vs. risks? What are the limitations of biopsies? What are biopsies? A biopsy is the removal of tissue in order to examine it for disease. The ... lung parenchyma during renal biopsy top of page What are the limitations of ... some cases, the amount of tissue obtained from a needle biopsy may not be ...

  6. [Diagnostic yield and postoperative management of patients submitted to brain biopsy in a university hospital].

    Science.gov (United States)

    Gracia, Isabel; Perelló, Laura; Valero, Ricard; Hervías, Adriana; Perdomo, Juan; Pujol, Roger; González, Josep; Hurtado, Paola; de Riva, Nicolás; Tercero, Francisco Javier; Carrero, Enrique; Ferrer, Enric; Fàbregas, Neus

    2015-01-01

    To assess the diagnostic yield and the incidence of perioperative complications in patients undergoing an open or closed cerebral biopsy and to determine the length of intensive care monitoring, for early diagnosis and fast management of perioperative complications. This was a retrospective analysis of all the patients that underwent brain biopsy between January 2006 and July 2012. We recorded demographic data, comorbidities, modality of biopsy, intraoperative clinical data, histological results, computed tomography scanning findings and occurrence, and type of perioperative complications and moment of appearance. Seventy-six brain biopsies in 75 consecutive patients (51 closed and 25 open) were analysed. Diagnostic yield was 98% for closed biopsies and 96% for open biopsies. Mortality related to the procedures was 3.9 and 4%, respectively. The incidence of major complications was 3.9% for closed biopsies and 8% for open biopsies; half of these appeared within the first 24 postoperative hours, during patient stay in the Intensive Care Unit. Age was the only risk factor for complications (P=.04) in our study. No differences in morbimortality were found between the studied groups. Diagnostic yield was very high in our series. Because the importance of early diagnosis of complications for preventing long-term sequelae, we recommend overnight hospital stay for observation after open or closed brain biopsy. Copyright © 2014 Sociedad Española de Neurocirugía. Published by Elsevier España. All rights reserved.

  7. Biopsy

    Science.gov (United States)

    ... to examine tissue for disease. Normal Results The tissue removed is normal. What Abnormal Results Mean An abnormal biopsy means that the tissue or cells have an unusual structure, shape, size, ...

  8. Comparison of the Diagnostic Yield of EUS Needles for Liver Biopsy: Ex Vivo Study.

    Science.gov (United States)

    Lee, Woo Jung; Uradomo, Lance T; Zhang, Yang; Twaddell, William; Darwin, Peter

    2017-01-01

    EUS-guided liver biopsy is an emerging method of liver tissue acquisition which is safe and had been shown to produce excellent histological yield. There is limited data comparing the diagnostic yield of different FNA needles. We aimed to compare the diagnostic performance of four commercially available 19-gauge FNA needles. Four FNA needles and one percutaneous needle were used to perform liver biopsies on two human cadaveric livers: Cook Echotip Procore™, Olympus EZ Shot 2™, Boston Scientific Expect Slimline™, Covidien SharkCore™, and an 18-gauge percutaneous needle (TruCore™, Argon Medical Devices). Each needle obtained biopsies by three, six, and nine complete back-and-forth motions of the needle ("throw") with a fanning technique. The combined lengths of specimen fragments and the total number of complete portal tracts (CPT) were measured by a blinded pathologist. One-way analysis of variance (ANOVA) and Bonferroni correction were used for statistical analysis. A total of 52 liver biopsies were performed. The Covidien SharkCore needle had significantly greater number of CPT compared to other FNA needles. The number of "throws" did not impact the number of CPT significantly. There was no statistically significant difference in mean total specimen length between each FNA needle type. The Covidien SharkCore needle produced superior histological specimen by capturing more CPT, possibly due to its unique needle design.

  9. High velocity pulse biopsy device enables controllable and precise needle insertion and high yield tissue acquisition.

    Science.gov (United States)

    Schässburger, Kai-Uwe; Paepke, Stefan; Saracco, Ariel; Azavedo, Edward; Ekström, Christina; Wiksell, Hans

    2018-02-01

    Minimally invasive biopsies are a cornerstone of breast cancer management with ultrasound being the preferred guidance modality. New developments in breast cancer management and advances in imaging technologies bring new challenges to current biopsy methodologies. A new biopsy device (NeoNavia® biopsy system, 14 G) was developed. It incorporates a pneumatic needle insertion mechanism that is intended to provide better control of needle progression and enable stepwise insertion without noticeable deformation or displacement of surrounding tissue as visualized under ultrasound. A new method of tissue acquisition was designed to achieve a sampling yield higher than standard methodologies. Needle dynamics was assessed on a specifically designed test bed and sampling performance was compared to a Magnum® biopsy instrument (Bard, Covington, GA, USA) in representative tissue models. The histological quality of samples obtained ex-vivo was evaluated. A pneumatic pulse was measured to accelerate the needle to a maximum velocity of 21.2 ± 2.5 m/s on a stroke length of 2.5 mm, achieving significantly higher acceleration, maximum velocity and power than current biopsy devices. Mean weight of samples obtained by the NeoNavia device were 3.5, 4.6, and 4.3 times higher when sampling was performed in turkey breast, calf thymus and swine pancreas, respectively, as compared to samples obtained with the Magnum instrument. Ex-vivo analysis indicates that the method of tissue acquisition has no apparent negative impact on the histopathologic quality of obtained samples. Copyright © 2018 Associazione Italiana di Fisica Medica. Published by Elsevier Ltd. All rights reserved.

  10. Post clamp

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    Ramsey, John K. (Inventor); Meyn, Erwin H. (Inventor)

    1990-01-01

    A pair of spaced collars are mounted at right angles on a clamp body by retaining rings which enable the collars to rotate with respect to the clamp body. Mounting posts extend through aligned holes in the collars and clamp body. Each collar can be clamped onto the inserted post while the clamp body remains free to rotate about the post and collar. The clamp body is selectively clamped onto each post.

  11. Computer tomography-guided core biopsies in a county hospital in Sweden: Complication rate and diagnostic yield

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    Eva Branden

    2014-01-01

    Full Text Available Background: Core biopsies are valuable in obtaining sufficient tissue to ensure diagnosis of diseases in the thorax. Objective: To evaluate the complication rate and the diagnostic yield in computer tomography (CT-guided core biopsies performed in a county hospital in Sweden. Methods: Medical journals, spirometry results, pathology reports and CT scans were reviewed in 463 consecutive cases, where a transthoracic core biopsy was performed between January 2005 and December 2010. Of these 380 (82% were lung lesions, 48 (10% were mediastinal lesions and 35 (8% were pleural lesions. Results: All patients underwent a chest X-ray 4 hours post-biopsy and pneumothorax was seen in 156/463 (34% patients: 137 after lung biopsy and 17 after mediastinal biopsy. Chest tube insertion was required for 27 (17% of these patients (6% of all core biopsies. Small intraparenchymal hemorrhages and hemoptysis were observed with subjective difficulty in one case. The diagnostic yield for the 463 patients was 212 (46% cases of lung cancer, 188 (41% benign lesions and 39 (8% pulmonary metastases. Conclusions: A transthoracic core biopsy ensures diagnosis with a low complication rate and is suitable as an outpatient procedure. An increased risk for pneumothorax was observed when the biopsied lesion was small or when emphysema was in the path of the biopsy needle. Reduced lung function pre-biopsy or emphysema in the path of the biopsy needle increased the need for chest tube treatment of pneumothorax. A CT-guided core biopsy is safe and applicable in a county hospital.

  12. Peripheral Lymph Node Excisional Biopsy: Yield, Relevance, and Outcomes in a Remote Surgical Setup

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    Ashish Lal Shrestha

    2018-01-01

    Full Text Available Objective. To study the patient profile for symptomatic peripheral lymphadenopathy in terms of histopathological findings and demography and evaluate the yield, relevance, and outcomes of peripheral lymph node biopsy (PLNB as a diagnostic step in a remote setup in the absence of less invasive options like fine-needle aspiration cytology (FNAC or ultrasonogram- (USG- guided FNAC. Methods. A retrospective review of patients undergoing PLNB between 1 May 2011 and 30 April 2013 was done. Demographics, histopathological reports, and outcomes were studied. Results. Of 132 patients, 51 (38.63% were male and 81 (61.36% were female. There were 48 (36.3% patients in the age group less than 16 years, and 84 (63.6% were beyond 16 years. The commonest site of biopsy was the neck in 114 (86.36% patients. The histopathological diagnosis was tuberculosis (TB in 60 (45.45% patients, reactive lymphadenitis in 29 (21.9%, nonspecific granuloma in 18 (13.6%, lymphoma in 7 (5.3%, acute lymphadenitis in 7 (5.3%, metastatic secondary in 3 (2.2%, and other benign causes in 8 (6.06%. Conclusions. PLNB is a procedure with good diagnostic yield in evaluation of peripheral lymphadenopathy. Its relevance is appreciable in a remote setup where less invasive options are unavailable. Its simplicity and lack of mortality/significant morbidity make it a valid option in rural surgical practice.

  13. High Yield of Adult Oligodendrocyte Lineage Cells Obtained from Meningeal Biopsy

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    Sissi Dolci

    2017-10-01

    Full Text Available Oligodendrocyte loss can lead to cognitive and motor deficits. Current remyelinating therapeutic strategies imply either modulation of endogenous oligodendrocyte precursors or transplantation of in vitro expanded oligodendrocytes. Cell therapy, however, still lacks identification of an adequate source of oligodendrocyte present in adulthood and able to efficiently produce transplantable cells. Recently, a neural stem cell-like population has been identified in meninges. We developed a protocol to obtain high yield of oligodendrocyte lineage cells from one single biopsy of adult rat meningeal tissue. From 1 cm2 of adult rat spinal cord meninges, we efficiently expanded a homogenous culture of 10 millions of meningeal-derived oligodendrocyte lineage cells in a short period of time (approximately 4 weeks. Meningeal-derived oligodendrocyte lineage cells show typical mature oligodendrocyte morphology and express specific oligodendrocyte markers, such as galactosylceramidase and myelin basic protein. Moreover, when transplanted in a chemically demyelinated spinal cord model, meningeal-derived oligodendrocyte lineage cells display in vivo-remyelinating potential. This oligodendrocyte lineage cell population derives from an accessible and adult source, being therefore a promising candidate for autologous cell therapy of demyelinating diseases. In addition, the described method to differentiate meningeal-derived neural stem cells into oligodendrocyte lineage cells may represent a valid in vitro model to dissect oligodendrocyte differentiation and to screen for drugs capable to promote oligodendrocyte regeneration.

  14. Replication Clamps and Clamp Loaders

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    Hedglin, Mark; Kumar, Ravindra; Benkovic, Stephen J.

    2013-01-01

    To achieve the high degree of processivity required for DNA replication, DNA polymerases associate with ring-shaped sliding clamps that encircle the template DNA and slide freely along it. The closed circular structure of sliding clamps necessitates an enzyme-catalyzed mechanism, which not only opens them for assembly and closes them around DNA, but specifically targets them to sites where DNA synthesis is initiated and orients them correctly for replication. Such a feat is performed by multisubunit complexes known as clamp loaders, which use ATP to open sliding clamp rings and place them around the 3′ end of primer–template (PT) junctions. Here we discuss the structure and composition of sliding clamps and clamp loaders from the three domains of life as well as T4 bacteriophage, and provide our current understanding of the clamp-loading process. PMID:23545418

  15. Diagnostic yield and complications of transthoracic computed tomography-guided biopsies

    DEFF Research Database (Denmark)

    Vagn-Hansen, Chris Aksel; Pedersen, Malene Roland Vils; Rafaelsen, Søren Rafael

    2016-01-01

    INTRODUCTION: The widespread use of computed tomography (CT) improves detection of pulmonary lesions, which are not only detected at an increased rate but also at a smaller size. CT-guided lung biopsies are now more frequently used than fluoroscopy-guided lung biopsies. The main aim of the present...

  16. Biopsy case mix and diagnostic yield at a Malawian central hospital ...

    African Journals Online (AJOL)

    Pathological examination of tissue biopsies with histological confirmation of a correct cancer diagnosis is central to cancer care. Without an accurate and specific ... The oesophagus was the most common biopsied site followed by breast, bladder, bone, prostate, bowel, and cervical lymph node. Malignancies were found in ...

  17. Rigid clamp

    Science.gov (United States)

    Benavides, Gilbert L.; Burt, Jack D.

    1994-01-01

    The invention relates to a clamp mechanism that can be used to attach or temporarily support objects inside of tubular goods. The clamp mechanism can also be modified so that it grips objects. The clamp has a self-centering feature to accommodate out-of-roundness or other internal defections in tubular objects such as pipe. A plurality of clamping shoes are expanded by a linkage which is preferably powered by a motor to contact the inside of a pipe. The motion can be reversed and jaw elements can be connected to the linkage so as to bring the jaws together to grab an object.

  18. Diagnostic yield of kidney biopsies performed in a suburban, satellite hospital

    Directory of Open Access Journals (Sweden)

    Che Rosle Draman

    2013-01-01

    Full Text Available Kidney biopsy is indicated to confirm the clinical diagnosis or to evaluate prognosis of a renal problem. It is a reliable and safe procedure, especially with real-time ultrasound guidance. This is a single-center, retrospective review of the biopsies performed in Hospital Tengku Ampuan Afzan, Pahang from 2000 to 2010. The demographic data, clinical parameters, and histological reports were extracted from clinic records and analyzed to determine the diagnostic adequacy of biopsy samples for both lupus and non-lupus patients. A total of 219 biopsies were performed throughout the period and only 74 were included in this review. Their mean age was 22.5 ± 10.5 years. 59.5% of the biopsies were performed on female patients. Malays comprised 79.7% (n = 59 of them, followed by Chinese (18.9%, n=14 and Indian (1.4%, n=1. About one-third of the biopsies(n = 25 were performed on patients with lupus nephritis and two-thirds (n = 49 on non-lupus nephritis patients. At the time of biopsy, their serum creatinine values were normal, serum albumin 28.4 ± 10 g/L and total cholesterol 8.9 ± 4.6 mmol/L (mean ± SD. The urine dipstick was 3+ for both proteinuria and hematuria and daily protein excretion was 3.6 ± 3.2 g. Sixty-seven specimens were considered adequate and only six (8% were inadequate for histological interpretations. The mean number of glomeruli in the biopsy specimens was 16 ± 9.9 (range: 0-47 glomeruli. In non-lupus patients, focal segmental glomerulosclerosis was the commonest histological diagnosis (n = 15, 30.6%, followed by minimal change disease (n = 13, 26.5% and mesangial proliferative glomerulonephritis (n = 7, 14.3%. Membranous nephropathy was diagnosed in four (8.2% and membranoproliferative glomerulonephritis in two (4.1% specimens. Both post-infectious glomerulonephritis and advanced glomerulosclerosis were found in one specimen each. Among the lupus nephritis patients (n = 25, 88% of them were females (P <0.05 and lupus nephritis

  19. Rotary powered device for bone marrow aspiration and biopsy yields excellent specimens quickly and efficiently.

    Science.gov (United States)

    Swords, Ronan T; Kelly, Kevin R; Cohen, Stephen C; Miller, Larry J; Philbeck, Thomas E; Hacker, Sander O; Spadaccini, Cathy J; Giles, Francis J; Brenner, Andrew J

    2010-06-01

    Recently, a new FDA-cleared battery powered bone marrow biopsy system was developed to allow operators access to the bone marrow space quickly and efficiently. A pre-clinical evaluation of the device (OnControl, Vidacare Corporation, San Antonio, TX, USA) on anesthetized pigs was conducted, in addition to a clinical evaluation in hematology clinic patients requiring a bone marrow biopsy. Twenty-six samples were collected from the swine model. No cellular artifact or thermal damage was reported in any of the samples obtained. For the clinical evaluation of the device, 16 patients were recruited. Mean time from needle contact with skin to needle removal was 38.5 +/- 13.94 seconds. No complications were reported. In this study, the manual and powered samples were equivalent in specimen quality. In the patients evaluated, the device was safe, easy to use and the mean procedural time was significantly faster than previously reported with a manual technique.

  20. Charlie's Clamp.

    Science.gov (United States)

    Tarino, Janet Z.

    1998-01-01

    Presents a version of the crush-the-can demonstration which is a hands-on activity in which students use an inexpensive, easily made holder for the can called Charlie's clamp. Includes some suggestions for the follow-up discussion. (DDR)

  1. Factors influencing the diagnostic yield and accuracy of image-guided percutaneous needle biopsy of pediatric tumors: single-center audit of a 26-year experience.

    Science.gov (United States)

    Blondiaux, Eléonore; Laurent, Méryle; Audureau, Etienne; Boudjemaa, Sabah; Sileo, Chiara; Lenoir, Marion; Dainese, Linda; Garel, Catherine; Coulomb, Aurore; Ducou le Pointe, Hubert

    2016-03-01

    Image-guided percutaneous core needle biopsy is a common procedure for diagnosis of both solid tumors and hematological malignancies in children. Despite recent improvements, a certain rate of non-diagnostic biopsies persists. To assess the factors influencing the diagnostic yield and accuracy of percutaneous core needle biopsies of pediatric tumors. We conducted a single-center retrospective study of a 26-year experience with image-guided biopsies in children and young adults. Using uni- and multivariate analysis, we evaluated the association of diagnostic yield and accuracy with technical factors (image-guided procedure, pathological technique) and clinical factors (complication rate, histological type and anatomical location). We retrieved data relating to 396 biopsies were performed in 363 children and young adults (mean age: 7.4 years). Overall, percutaneous core needle biopsy showed a diagnostic yield of 89.4% (95% confidence interval [CI] 85.9-92.2) and an accuracy of 90.9% (CI 87.6-93.6) with a complication rate of 2.5% (CI 1.2-4.6).The diagnostic yield increased with the use of advanced tissue assessment techniques (95.7% with immunohistochemistry versus 82.3% without immunohistochemistry; P advanced pathological techniques and an increased number of passes are the two main factors influencing the diagnostic success of biopsies in pediatric tumors.

  2. Do the number and volume of surgical lung biopsies influence the diagnostic yield in interstitial lung disease? A propensity score analysis.

    Science.gov (United States)

    Fibla, Juan J; Brunelli, Alessandro; Allen, Mark S; Wigle, Dennis; Shen, Robert; Nichols, Francis; Deschamps, Claude; Cassivi, Stephen D

    2015-02-01

    Our objective was to evaluate whether the number and volume of surgical lung biopsies (SLB) influence the diagnosis of diffuse interstitial lung disease (ILD). Retrospective study of SLB for suspected ILD in patients from the Mayo Clinic from January 2002 to January 2010. Data were collected in the institution and analyzed. 311 patients were studied. Mean number of biopsies was 2.05 (SD 0.6); 1 biopsy in 50 (16%), 2 in 198 (63.7%), 3 in 59 (19%) and 4 in 4 (1.3%). Histopathologic diagnosis was: definitive (specific): 232 (74.6%), descriptive (non-specific): 76 (24.4%), no diagnosis: 3 (1%). After excluding patients without diagnosis (n=3), there were 50 patients with only 1 biopsy, 196 with 2 and 62 with 3 or 4; the definitive diagnostic yield was similar in all 3 groups (37/50; 74%, 150/196; 77%, and 45/62; 73%) (Chi-square, p value 0.8). The propensity score analysis between patients with 1 SLB and patients with more than 1 SLB also showed no difference in diagnostic yield. Regarding the volume of biopsies, mean total volume was 34.4 cm(3) (SD 46): 41.2 cm(3) (3 cases) in patients with no diagnosis; 33.6 cm(3) (232 cases, SD 47) in patients with specific diagnosis; and 36.6 cm(3) (76 cases, SD 44) in patients with descriptive diagnosis. Biopsy volume had no influence on histopathology yield (ANOVA, p value .8). The number and volume of the biopsy specimens in SLB did not seem to influence diagnosis. Based on our results, we believe a single sample from a representative area may be sufficient for diagnosis. Randomized prospective trials should be performed to optimize SLB for ILD. Copyright © 2014 SEPAR. Published by Elsevier Espana. All rights reserved.

  3. A STUDY OF YIELD OF CT-GUIDED INTERVENTIONS (CORE NEEDLE BIOPSY AND FINE NEEDLE ASPIRATION CYTOLOGY IN THORACIC LESIONS AND THE COMPLICATIONS FACED DURING THE INTERVENTIONS

    Directory of Open Access Journals (Sweden)

    P. Suresh

    2017-06-01

    Full Text Available BACKGROUND The quest for accurate diagnosis of lung pathology has been there all through the history of medicine. The pathologist is the person who makes the final diagnosis, but submission of the lesion to the pathologist involves procedures, both invasive and noninvasive like Open Lung Biopsy (OLB, Percutaneous Transthoracic Needle Biopsy (PTNB and Fine-Needle Aspiration Cytology (FNAC. Percutaneous nonoperative procedures in the chest were performed even before the advent of imaging. Leyden performed the first transthoracic needle lung biopsy in 1882 to confirm pulmonary infection. MATERIALS AND METHODS This is a hospital-based observational study of CT-guided interventional procedures in patients with thoracic lesions diagnosed by imaging methods like chest radiograph, CT or MRI scans. These patients were referred to the Department of Radiodiagnosis for CT-guided thoracic interventions from the Chest Medicine Department and other clinical departments of our hospital (The Oxford Medical College, Hospital and Research Centre. The duration of the study was for a period of 18 months from November 2015 to May 2017. RESULTS Yield of CT-guided fine needle aspiration cytology of thoracic lesions in this study was 28.57% with a failure rate of 71.43%. Yield of CT-guided core needle biopsy of thoracic lesions in this study was 100% with no failure rate. CONCLUSION Percutaneous CT-guided interventions like core biopsy and fine needle aspiration cytology are relatively simple minimallyinvasive procedures with good patient acceptance, low morbidity and almost negligible mortality.

  4. Clamp usable as jig and lifting clamp

    Science.gov (United States)

    Tsuyama, Yoshizo

    1976-01-01

    There is provided a clamp which is well suited for use as a lifting clamp for lifting and moving materials of assembly in a shipyard, etc. and as a pulling jig in welding and other operations. The clamp comprises a clamp body including a shackle for engagement with a pulling device and a slot for receiving an article, and a pair of jaws provided on the leg portions of the clamp body on the opposite sides of the slot to grip the article in the slot, one of said jaws consisting of a screw rod and the other jaw consisting of a swivel jaw with a spherical surface, whereby when the article clamped in the slot by the pair of jaws tends to slide in any direction with respect to the clamp body, the article is more positively gripped by the pair of jaws.

  5. CT fluoroscopy-guided renal tumour cutting needle biopsy. Retrospective evaluation of diagnostic yield, safety, and risk factors for diagnostic failure

    Energy Technology Data Exchange (ETDEWEB)

    Iguchi, Toshihiro; Hiraki, Takao; Matsui, Yusuke; Fujiwara, Hiroyasu; Sakurai, Jun; Masaoka, Yoshihisa; Gobara, Hideo; Kanazawa, Susumu [Okayama University Medical School, Department of Radiology, Okayama (Japan)

    2018-01-15

    To evaluate retrospectively the diagnostic yield, safety, and risk factors for diagnostic failure of computed tomography (CT) fluoroscopy-guided renal tumour biopsy. Biopsies were performed for 208 tumours (mean diameter 2.3 cm; median diameter 2.1 cm; range 0.9-8.5 cm) in 199 patients. One hundred and ninety-nine tumours were ≤4 cm. All 208 initial procedures were divided into diagnostic success and failure groups. Multiple variables related to the patients, lesions, and procedures were assessed to determine the risk factors for diagnostic failure. After performing 208 initial and nine repeat biopsies, 180 malignancies and 15 benign tumours were pathologically diagnosed, whereas 13 were not diagnosed. In 117 procedures, 118 Grade I and one Grade IIIa adverse events (AEs) occurred. Neither Grade ≥IIIb AEs nor tumour seeding were observed within a median follow-up period of 13.7 months. Logistic regression analysis revealed only small tumour size (≤1.5 cm; odds ratio 3.750; 95% confidence interval 1.362-10.326; P = 0.011) to be a significant risk factor for diagnostic failure. CT fluoroscopy-guided renal tumour biopsy is a safe procedure with a high diagnostic yield. A small tumour size (≤1.5 cm) is a significant risk factor for diagnostic failure. (orig.)

  6. Incremental yield of dysplasia detection in Barrett's esophagus using volumetric laser endomicroscopy with and without laser marking compared with a standardized random biopsy protocol.

    Science.gov (United States)

    Alshelleh, Mohammad; Inamdar, Sumant; McKinley, Matthew; Stewart, Molly; Novak, Jeffrey S; Greenberg, Ronald E; Sultan, Keith; Devito, Bethany; Cheung, Mary; Cerulli, Maurice A; Miller, Larry S; Sejpal, Divyesh V; Vegesna, Anil K; Trindade, Arvind J

    2018-02-02

    Volumetric laser endomicroscopy (VLE) is a new wide-field advanced imaging technology for Barrett's esophagus (BE). No data exist on incremental yield of dysplasia detection. Our aim is to report the incremental yield of dysplasia detection in BE using VLE. This is a retrospective study from a prospectively maintained database from 2011 to 2017 comparing the dysplasia yield of 4 different surveillance strategies in an academic BE tertiary care referral center. The groups were (1) random biopsies (RB), (2) Seattle protocol random biopsies (SP), (3) VLE without laser marking (VLE), and (4) VLE with laser marking (VLEL). A total of 448 consecutive patients (79 RB, 95 SP, 168 VLE, and 106 VLEL) met the inclusion criteria. After adjusting for visible lesions, the total dysplasia yield was 5.7%, 19.6%, 24.8%, and 33.7%, respectively. When compared with just the SP group, the VLEL group had statistically higher rates of overall dysplasia yield (19.6% vs 33.7%, P = .03; odds ratio, 2.1, P = .03). Both the VLEL and VLE groups had statistically significant differences in neoplasia (high-grade dysplasia and intramucosal cancer) detection compared with the SP group (14% vs 1%, P = .001 and 11% vs 1%, P = .003). A surveillance strategy involving VLEL led to a statistically significant higher yield of dysplasia and neoplasia detection compared with a standard random biopsy protocol. These results support the use of VLEL for surveillance in BE in academic centers. Copyright © 2018 American Society for Gastrointestinal Endoscopy. Published by Elsevier Inc. All rights reserved.

  7. Quick-attach clamp

    Science.gov (United States)

    Vano, A. E.

    1968-01-01

    Clamp of the slideable jaw type can be applied to moving lines such as cables or ropes. The clamp has a trigger-operated jaw that can be attached to a redrop parachute on a moving tow cable. The trigger mechanism maintains the jaws retracted in the housing until they are released for clamping.

  8. Cone biopsy

    Science.gov (United States)

    ... biopsy; HSIL - cone biopsy; Low-grade cone biopsy; High-grade cone biopsy; Carcinoma in situ-cone biopsy; ... the cervix. In: Baggish MS, Karram MM, eds. Atlas of Pelvic Anatomy and Gynecologic Surgery . 4th ed. ...

  9. Photovoltaic panel clamp

    Science.gov (United States)

    Mittan, Margaret Birmingham [Oakland, CA; Miros, Robert H. J. [Fairfax, CA; Brown, Malcolm P [San Francisco, CA; Stancel, Robert [Loss Altos Hills, CA

    2012-06-05

    A photovoltaic panel clamp includes an upper and lower section. The interface between the assembled clamp halves and the module edge is filled by a flexible gasket material, such as EPDM rubber. The gasket preferably has small, finger like protrusions that allow for easy insertion onto the module edge while being reversed makes it more difficult to remove them from the module once installed. The clamp includes mounting posts or an integral axle to engage a bracket. The clamp also may include a locking tongue to secure the clamp to a bracket.

  10. Comparison of diagnostic yield and safety profile of radial endobronchial ultrasound-guided bronchoscopic lung biopsy with computed tomography-guided percutaneous needle biopsy in evaluation of peripheral pulmonary lesions: A randomized controlled trial

    Directory of Open Access Journals (Sweden)

    Ayush Gupta

    2018-01-01

    Full Text Available Background: Peripheral pulmonary lesions (PPLs pose a diagnostic challenge, and the optimal investigation in many such cases remains unclear. Computed tomography (CT-guided percutaneous needle biopsy (CT-PNB has been the modality of choice for such lesions with a high diagnostic accuracy but with high rates of pneumothorax. Endobronchial ultrasound (EBUS with a radial probe is an alternate diagnostic modality with increased diagnostic yield of bronchoscopy in the evaluation of PPL. We conducted a randomized controlled trial comparing the diagnostic accuracy and complication rates of radial EBUS with CT-guided lung biopsy for the evaluation of PPL. Methods: Fifty patients with PPL surrounded by lung parenchyma on all sides were randomly assigned to either radial EBUS or CT-PNB group (25 each. Results: Both groups had similar clinicoradiologic characteristics. The diagnostic accuracy of radial EBUS was comparable to CT-PNB with no statistically significant difference (72 vs. 84%; P = 0.306. However, the yield was significantly lower in right upper lobe lesions (20% vs. 83.3%; P = 0.03. CT-PNB group had significantly higher pneumothorax rates than radial EBUS (20% vs. 0%; P = 0.03. The lesions that were more than 2 cm, those with ultrasound feature of continuous hyperechoic margin around the lesion (P = 0.007, and the position of the ultrasound probe within the lesion (P < 0.001 were associated with a higher diagnostic yield with radial EBUS. Conclusion: Our findings suggest that radial EBUS is a safer investigation than CT-PNB with a comparable diagnostic accuracy for PPL not abutting the chest wall (CTRI/2017/02/007762.

  11. Complication rate and diagnostic yield of percutaneous native kidney biopsies: A 10-year experience at a Tertiary Care Hospital in Pakistan

    Directory of Open Access Journals (Sweden)

    Sonia Yaqub

    2017-01-01

    Full Text Available The use of an automated biopsy device, and real-time ultrasound for percutaneous kidney biopsies (PKBs has improved the likelihood of obtaining adequate tissue for diagnosis and also has reduced the complications associated with the procedure. We aimed to determine the frequency and type of complications associated with PKB and to determine the diagnostic yield. It was a retrospective file-based review of cases who underwent PKB of native kidney between January 2003 and December 2013 at the Aga Khan University Hospital in Karachi, Pakistan. PKBs were performed by trained nephrologists or radiologists using an automated device with a 16/18-gauge needle under real-time ultrasound. The data obtained included age, gender, clinical and histopathological diagnosis, and complications associated with the procedure (minor: hematuria, local infections, and hematoma; major: transfusions, severe infections, surgery, nephrectomy, arteriography, embolism, and death. Yield of the procedure was based on the number of glomeruli obtained. Patients having major complications were compared with the patients who had minor or no complications. A total of 433 native kidney biopsies were performed. The mean age of the patients was 41 ± 15.9 years, and 58% of the patients were male. The main histological findings were membranoproliferative glomerulonephritis (17.6% followed by focal and segmental glomerulosclerosis (16.4% and interstitial nephritis (13.9%. Majority of the procedures were performed by nephrologists (67.4%. The overall complication rate was 14.2%. Among those, 21 patients (4.8% had a major complication while the others had minor complications. Of those who had a major complication, 17 patients required blood transfusion(s and had hematuria or a major hematoma, three had prolonged hospitalization >24 hours, and one patient required surgical intervention. Only 10 procedures (2.3% had inadequate tissue to establish the histopathologic diagnosis. PKB under

  12. Complication rate and diagnostic yield of percutaneous native kidney biopsies: A 10-year experience at a Tertiary Care Hospital in Pakistan.

    Science.gov (United States)

    Yaqub, Sonia; Ahmed, Nayla; Fatima, Urooj; Maqbool, Ayesha; Ashif, Waqar; Hussain, Syed A

    2017-01-01

    The use of an automated biopsy device, and real-time ultrasound for percutaneous kidney biopsies (PKBs) has improved the likelihood of obtaining adequate tissue for diagnosis and also has reduced the complications associated with the procedure. We aimed to determine the frequency and type of complications associated with PKB and to determine the diagnostic yield. It was a retrospective file-based review of cases who underwent PKB of native kidney between January 2003 and December 2013 at the Aga Khan University Hospital in Karachi, Pakistan. PKBs were performed by trained nephrologists or radiologists using an automated device with a 16/18-gauge needle under real-time ultrasound. The data obtained included age, gender, clinical and histopathological diagnosis, and complications associated with the procedure (minor: hematuria, local infections, and hematoma; major: transfusions, severe infections, surgery, nephrectomy, arteriography, embolism, and death. Yield of the procedure was based on the number of glomeruli obtained. Patients having major complications were compared with the patients who had minor or no complications. A total of 433 native kidney biopsies were performed. The mean age of the patients was 41 ± 15.9 years, and 58% of the patients were male. The main histological findings were membranoproliferative glomerulonephritis (17.6%) followed by focal and segmental glomerulosclerosis (16.4%) and interstitial nephritis (13.9%). Majority of the procedures were performed by nephrologists (67.4%). The overall complication rate was 14.2%. Among those, 21 patients (4.8%) had a major complication while the others had minor complications. Of those who had a major complication, 17 patients required blood transfusion(s) and had hematuria or a major hematoma, three had prolonged hospitalization >24 hours, and one patient required surgical intervention. Only 10 procedures (2.3%) had inadequate tissue to establish the histopathologic diagnosis. PKB under real

  13. Insulated pipe clamp design

    International Nuclear Information System (INIS)

    Anderson, M.J.; Hyde, L.L.; Wagner, S.E.; Severud, L.K.

    1980-01-01

    Thin wall large diameter piping for breeder reactor plants can be subjected to significant thermal shocks during reactor scrams and other upset events. On the Fast Flux Test Facility, the addition of thick clamps directly on the piping was undesired because the differential metal temperatures between the pipe wall and the clamp could have significantly reduced the pipe thermal fatigue life cycle capabilities. Accordingly, an insulated pipe clamp design concept was developed. The design considerations and methods along with the development tests are presented. Special considerations to guard against adverse cracking of the insulation material, to maintain the clamp-pipe stiffness desired during a seismic event, to minimize clamp restraint on the pipe during normal pipe heatup, and to resist clamp rotation or spinning on the pipe are emphasized

  14. Insulated pipe clamp design

    International Nuclear Information System (INIS)

    Anderson, M.J.; Hyde, L.L.; Wagner, S.E.; Severud, L.K.

    1980-01-01

    Thin wall large diameter piping for breeder reactor plants can be subjected to significant thermal shocks during reactor scrams and other upset events. On the Fast Flux Test Facility, the addition of thick clamps directly on the piping was undesired because the differential metal temperatures between the pipe wall and the clamp could have significantly reduced the pipe thermal fatigue life cycle capabilities. Accordingly, an insulated pipe clamp design concept was developed. 5 refs

  15. Radial wedge flange clamp

    Science.gov (United States)

    Smith, Karl H.

    2002-01-01

    A radial wedge flange clamp comprising a pair of flanges each comprising a plurality of peripheral flat wedge facets having flat wedge surfaces and opposed and mating flat surfaces attached to or otherwise engaged with two elements to be joined and including a series of generally U-shaped wedge clamps each having flat wedge interior surfaces and engaging one pair of said peripheral flat wedge facets. Each of said generally U-shaped wedge clamps has in its opposing extremities apertures for the tangential insertion of bolts to apply uniform radial force to said wedge clamps when assembled about said wedge segments.

  16. Clamp Restrains Pressure Line

    Science.gov (United States)

    Aliberti, J. A.

    1982-01-01

    Safety restraint protects people and property if a high-pressure fitting fails. As long as pressure line remains attached at the fitting, clamp exerts essentially no force on hose. If fitting fails, force of fluid leaving free end of hose causes the cam on the clamp to compress hose with a positive locking action.

  17. Quick action clamp

    Science.gov (United States)

    Calco, Frank S. (Inventor)

    1991-01-01

    A quick release toggle clamp that utilizes a spring that requires a deliberate positive action for disengagement is presented. The clamp has a sliding bolt that provides a latching mechanism. The bolt is moved by a handle that tends to remain in an engaged position while under tension.

  18. Clamp-mount device

    Science.gov (United States)

    Clark, K. H. (Inventor)

    1983-01-01

    A clamp-mount device is disclosed for mounting equipment to an associated I-beam and the like structural member of the type having oppositely extending flanges wherein the device comprises a base and a pair of oppositely facing clamping members carried diagonally on the base clamping flanges therebetween and having flange receiving openings facing one another. Lock means are carried diagonally by the base opposite the clamping members locking the flanges in the clamping members. A resilient hub is carried centrally of the base engaging and biasing a back side of the flanges maintaining tightly clamped and facilitating use on vertical as well as horizontal members. The base turns about the hub to receive the flanges within the clamping members. Equipment may be secured to the base by any suitable means such as bolts in openings. Slidable gate latches secure the hinged locks in an upright locking position. The resilient hub includes a recess opening formed in the base and a rubber-like pad carried in this opening being depressably and rotatably carried therein.

  19. Mechanism of opening a sliding clamp

    OpenAIRE

    Douma, Lauren G.; Yu, Kevin K.; England, Jennifer K.; Levitus, Marcia; Bloom, Linda B.

    2017-01-01

    Abstract Clamp loaders load ring-shaped sliding clamps onto DNA where the clamps serve as processivity factors for DNA polymerases. In the first stage of clamp loading, clamp loaders bind and stabilize clamps in an open conformation, and in the second stage, clamp loaders place the open clamps around DNA so that the clamps encircle DNA. Here, the mechanism of the initial clamp opening stage is investigated. Mutations were introduced into the Escherichia coli β-sliding clamp that destabilize t...

  20. Liver biopsy

    Science.gov (United States)

    Biopsy - liver; Percutaneous biopsy ... the biopsy needle to be inserted into the liver. This is often done by using ultrasound. The ... the chance of damage to the lung or liver. The needle is removed quickly. Pressure will be ...

  1. Bend-absorbing clamp

    Science.gov (United States)

    Abbott, J. R.; Valencia, B., Jr.

    1979-01-01

    Compact, inexpensive clamp for flexible cables or rigid tubes absorbs vibrations and other motion. It accomodates wide range of dimensions, and saves space by eliminating pigtails or bellows commonly used to absorb linear movement or vibrations

  2. How a DNA polymerase clamp loader opens a sliding clamp

    OpenAIRE

    Kelch, Brian A.; Makino, Debora L.; O’Donnell, Mike; Kuriyan, John

    2011-01-01

    Processive chromosomal replication relies on sliding DNA clamps, which are loaded onto DNA by pentameric clamp loader complexes belonging to the AAA+ family of ATPases. We present structures for the ATP-bound state of the clamp loader complex from bacteriophage T4, bound to an open clamp and primer-template DNA. The clamp loader traps a spiral conformation of the open clamp so that both the loader and the clamp match the helical symmetry of DNA. One structure reveals that ATP has been hydroly...

  3. How a DNA polymerase clamp loader opens a sliding clamp

    Science.gov (United States)

    Kelch, Brian A.; Makino, Debora L.; O’Donnell, Mike; Kuriyan, John

    2012-01-01

    Processive chromosomal replication relies on sliding DNA clamps, which are loaded onto DNA by pentameric clamp loader complexes belonging to the AAA+ family of ATPases. We present structures for the ATP-bound state of the clamp loader complex from bacteriophage T4, bound to an open clamp and primer-template DNA. The clamp loader traps a spiral conformation of the open clamp so that both the loader and the clamp match the helical symmetry of DNA. One structure reveals that ATP has been hydrolyzed in one subunit, and suggests that clamp closure and ejection of the loader involves disruption of the ATP-dependent match in symmetry. The structures explain how synergy between the loader, the clamp and DNA can trigger ATP hydrolysis and release of the closed clamp on DNA. PMID:22194570

  4. Clamp for detonating fuze

    Science.gov (United States)

    Holderman, E. J.

    1968-01-01

    Quick acting clamp provides physical support for a closely confined detonating fuse in an application requiring removal and replacement at frequent intervals during test. It can be designed with a base of any required strength and configuration to permit the insertion of an object.

  5. Tongue biopsy

    Science.gov (United States)

    Biopsy - tongue ... A tongue biopsy can be done using a needle. You will get numbing medicine at the place where the ... provider will gently stick the needle into the tongue and remove a tiny piece of tissue. Some ...

  6. Mechanism of opening a sliding clamp.

    Science.gov (United States)

    Douma, Lauren G; Yu, Kevin K; England, Jennifer K; Levitus, Marcia; Bloom, Linda B

    2017-09-29

    Clamp loaders load ring-shaped sliding clamps onto DNA where the clamps serve as processivity factors for DNA polymerases. In the first stage of clamp loading, clamp loaders bind and stabilize clamps in an open conformation, and in the second stage, clamp loaders place the open clamps around DNA so that the clamps encircle DNA. Here, the mechanism of the initial clamp opening stage is investigated. Mutations were introduced into the Escherichia coli β-sliding clamp that destabilize the dimer interface to determine whether the formation of an open clamp loader-clamp complex is dependent on spontaneous clamp opening events. In other work, we showed that mutation of a positively charged Arg residue at the β-dimer interface and high NaCl concentrations destabilize the clamp, but neither facilitates the formation of an open clamp loader-clamp complex in experiments presented here. Clamp opening reactions could be fit to a minimal three-step 'bind-open-lock' model in which the clamp loader binds a closed clamp, the clamp opens, and subsequent conformational rearrangements 'lock' the clamp loader-clamp complex in a stable open conformation. Our results support a model in which the E. coli clamp loader actively opens the β-sliding clamp. © The Author(s) 2017. Published by Oxford University Press on behalf of Nucleic Acids Research.

  7. Muscle biopsy.

    Science.gov (United States)

    Meola, G; Bugiardini, E; Cardani, R

    2012-04-01

    Muscle biopsy is required to provide a definitive diagnosis in many neuromuscular disorders. It can be performed through an open or needle technique under local anesthesia. The major limitations of the needle biopsy technique are the sample size, which is smaller than that obtained with open biopsy, and the impossibility of direct visualization of the sampling site. However, needle biopsy is a less invasive procedure than open biopsy and is particularly indicated for diagnosis of neuromuscular disease in infancy and childhood. The biopsied muscle should be one affected by the disease but not be too weak or too atrophic. Usually, in case of proximal muscle involvement, the quadriceps and the biceps are biopsied, while under suspicion of mitochondrial disorder, the deltoid is preferred. The samples must be immediately frozen or fixed after excision to prevent loss of enzymatic reactivity, DNA depletion or RNA degradation. A battery of stainings is performed on muscle sections from every frozen muscle biopsy arriving in the pathology laboratory. Histological, histochemical, and histoenzymatic stainings are performed to evaluate fiber atrophy, morphological, and structural changes and metabolic disorders. Moreover, immunohistochemistry and Western blotting analysis may be used for expression analysis of muscle proteins to obtain a specific diagnosis. There are myopathies that do not need muscle biopsy since a genetic test performed on a blood sample is enough for definitive diagnosis. Muscle biopsy is a useful technique which can make an enormous contribution in the field of neuromuscular disorders but should be considered and interpreted together with the patient's family and clinical history.

  8. Ultrasound-guided forceps for pleural biopsy

    Directory of Open Access Journals (Sweden)

    Gamal Agmy

    2014-04-01

    Clinical implications: Ultrasound-guided forceps for pleural biopsy can overcome many of the limitations of the conventional needle biopsy procedures, provides multiple biopsy specimens of the parietal pleura that are inaccessible to the biopsy needle, and can be carried out easily and safely even in sick and obese patients. The diagnostic yield is nearly similar to thoracoscopy.

  9. Hand-Held Power Clamp

    Science.gov (United States)

    Clancy, J. P.

    1985-01-01

    Tool furnishes large pushing or pulling forces. Device includes two clamping blocks, two clamping plates, and a motor-driven linear actuator with selflocking screw shaft. Power clamp exerts opening or closing force at push of switch. Tool approximately 1 m long. Originally designed to secure payload aboard Space Shuttle, operated with one hand to apply opening or closing force of up to 1,000 lb (4,400 N). Clamp has potential applications as end effector for industrial robots and in rescue work to push or pull wreckage with great force.

  10. The Escherichia coli Clamp Loader Can Actively Pry Open the β-Sliding Clamp*

    Science.gov (United States)

    Paschall, Christopher O.; Thompson, Jennifer A.; Marzahn, Melissa R.; Chiraniya, Ankita; Hayner, Jaclyn N.; O'Donnell, Mike; Robbins, Arthur H.; McKenna, Robert; Bloom, Linda B.

    2011-01-01

    Clamp loaders load ring-shaped sliding clamps onto DNA. Once loaded onto DNA, sliding clamps bind to DNA polymerases to increase the processivity of DNA synthesis. To load clamps onto DNA, an open clamp loader-clamp complex must form. An unresolved question is whether clamp loaders capture clamps that have transiently opened or whether clamp loaders bind closed clamps and actively open clamps. A simple fluorescence-based clamp opening assay was developed to address this question and to determine how ATP binding contributes to clamp opening. A direct comparison of real time binding and opening reactions revealed that the Escherichia coli γ complex binds β first and then opens the clamp. Mutation of conserved “arginine fingers” in the γ complex that interact with bound ATP decreased clamp opening activity showing that arginine fingers make an important contribution to the ATP-induced conformational changes that allow the clamp loader to pry open the clamp. PMID:21971175

  11. Endometrial biopsy

    Science.gov (United States)

    ... due to changes in hormone levels ( anovulatory bleeding ) Risks Risks of endometrial biopsy include: Infection Causing a ... American College of Obstetricians and Gynecologists, Group Health Cooperative, Bellevue, WA. Also reviewed by David Zieve, MD, ...

  12. Bone Biopsy

    Science.gov (United States)

    ... bear denotes child-specific content. Related Articles and Media Computed Tomography (CT) - Body Magnetic Resonance Imaging (MRI) - Body X-ray, Interventional Radiology and Nuclear Medicine Radiation Safety Images related to Bone Biopsy Sponsored by Please note ...

  13. Skin Biopsy

    Science.gov (United States)

    ... tape it closed with small strips of clear, sticky tape. If you get stitches, your doctor will ... of Your Skin Melanoma Eczema Aspiration and Biopsy: Bone Marrow Impetigo Pityriasis Rosea View more Partner Message ...

  14. Radiologically Guided Bone Biopsy: Results of 502 Biopsies

    International Nuclear Information System (INIS)

    Ng, Chaan S.; Salisbury, Jonathan R.; Darby, Alan J.; Gishen, Philip

    1998-01-01

    Purpose: To analyze the results of 502 biopsies over a 19-year period for the purpose of highlighting the results that can be expected from such a large study, with emphasis on needle choice and anesthetic methods. Methods: The histological, cytological, and microbiological results of 477 patients who had 502 bone biopsies carried out between July 1977 and March 1996 were studied. Less than 5% of patients required second biopsies. There were almost equal numbers of males and females in the group. The lesions were visible radiologically and most of the biopsies were carried out by a single operator. The lesions were classified on their histopathological, cytopathological, and microbiological findings. Results: Tumors accounted for 40% of the biopsies, and infection for 16%. Biopsies which did not yield a 'positive' diagnosis accounted for 31%; these included specimens reported as normal, or as showing reactive changes, repair, remodelling, non-specific features, inflammation (but not clearly infective), or no evidence of malignancy or inflammation. Less than 4% of biopsies were incorrect, and some of these were re-biopsied. Conclusion: Bone biopsy is a valuable technique for positive diagnosis of malignancy or infection, as it enables a definitive plan for treatment and management of patients to be established. Exclusion of serious pathology is almost equally important. In principle, any osseous site can be biopsied using fluoroscopic or computed tomographic guidance. Care in the biopsy technique and selection of the bone needle is required

  15. Ultrasound guided pleural biopsy in undiagnosed exudative pleural effusion patients

    Directory of Open Access Journals (Sweden)

    Adel S. Ahmed

    2016-04-01

    In conclusion: Thoracic ultrasound (TUS guided pleural biopsy had a diagnostic yield which was slightly lower but comparable to both CT guided pleural biopsy and medical thoracoscopic pleural biopsy (MT.

  16. Nail biopsy: A user's manual

    Directory of Open Access Journals (Sweden)

    Chander Grover

    2018-01-01

    Full Text Available Nail biopsy is a procedure not routinely resorted to; but when indicated, it is often the only clue left for diagnosis. At such times, it pays to be conversant with it. It is an investigation that not only provides etiologic, diagnostic, and prognostic information but also aids in understanding the pathogenesis of nail diseases. It can be of therapeutic value, especially with respect to nail tumors. This article compiles the procedural techniques for nail biopsy of various types and attempts to summarize the evidence available in the literature. The objective of nail biopsy is to clinch a precise diagnosis of nail pathology with a simple and safe surgical procedure, avoiding pain or permanent nail damage. Patient selection is of utmost importance, wherein, the patient does not have typical skin lesions, yields inadequate information on routine nail investigations, and has no peripheral vascular compromise. The patient needs to be explained about the risks associated, the expected functional handicap, the time required for regrowth, a possibility of permanent nail dystrophy, and a possibility of not achieving a diagnosis even after the biopsy. Techniques and types of various nail biopsies are being discussed in this article. The specimen could be collected as an excision biopsy, punch biopsy, shave biopsy, or longitudinal biopsy. The trick lies in choosing the appropriate area for biopsy. Various biopsy types discussed in this article include nail plate biopsy (easiest and least scarring; nail bed biopsy (elliptical excision or punch; nail matrix biopsy (elliptical excision, punch excision (≤3 mm or tangential/shave excision; and nail fold biopsy. Complications reported along with means to minimize them are also discussed.

  17. Liver Biopsy

    Science.gov (United States)

    ... instrument called a cannula to remove the liver tissue sample. What is the liver and what does it do? ... who specializes in diagnosing diseases—looks at the tissue with a microscope and sends a report to the person's health care provider. What are the risks of liver biopsy? The risks ...

  18. Internal V-Band Clamp

    Science.gov (United States)

    Vaughn, Mark R.; Hafenrichter, Everett S.; Chapa, Agapito C.; Harris, Steven M.; Martinez, Marcus J.; Baty, Roy S.

    2006-02-28

    A system for clamping two tubular members together in an end-to-end relationship uses a split ring with a V-shaped outer rim that can engage a clamping surface on each member. The split ring has a relaxed closed state where the ends of the ring are adjacent and the outside diameter of the split ring is less than the minimum inside diameter of the members at their ends. The members are clamped when the split ring is spread into an elastically stretched position where the ring rim is pressed tightly against the interior surfaces of the members. Mechanisms are provided for removing the spreader so the split ring will return to the relaxed state, releasing the clamped members.

  19. Bingham Sealing and Application in Vacuum Clamping

    Science.gov (United States)

    Yao, S. M.; Teo, Wee Kin; Geng, Zunmin; Turner, Sam; Ridgway, Keith

    2011-12-01

    Vacuum clamping is extensively used in shell machining. In this paper a Bingham Sealing (BS) is presented and formulized based on Bingham plastic performance. The sealing capability of BS is evaluated in various cases. A new Bingham plastic is developed and the yield stress is measured. The performances of "O"ring sealing and BS with the developed Bingham plastic are compared to the static experiment. In this experiment the same vacuum is achieved and the distortion of the blade with BS is better than that with "O" ring sealing.

  20. Bingham Sealing and Application in Vacuum Clamping

    International Nuclear Information System (INIS)

    Yao, S M; Teo, Wee Kin; Geng Zunmin; Turner, Sam; Ridgway, Keith

    2011-01-01

    Vacuum clamping is extensively used in shell machining. In this paper a Bingham Sealing (BS) is presented and formulized based on Bingham plastic performance. The sealing capability of BS is evaluated in various cases. A new Bingham plastic is developed and the yield stress is measured. The performances of Or ing sealing and BS with the developed Bingham plastic are compared to the static experiment. In this experiment the same vacuum is achieved and the distortion of the blade with BS is better than that with 'O' ring sealing.

  1. How to Assess the Quality of Glucose Clamps? Evaluation of Clamps Performed With ClampArt, a Novel Automated Clamp Device.

    Science.gov (United States)

    Benesch, Carsten; Heise, Tim; Klein, Oliver; Heinemann, Lutz; Arnolds, Sabine

    2015-07-01

    There are no widely accepted parameters to assess the quality of glucose clamps. Thus, we selected different parameters describing clamp quality. These parameters were then evaluated in glucose clamps carried out with ClampArt, a novel CE-marked, state-of-the-art fully automated glucose clamp device employing continuous blood glucose (BG) measurements and minute-by-minute adaptations of glucose infusion rate (GIR). Thirty-nine glucose clamps were performed in 10 healthy and 29 subjects with type 1 diabetes (T1DM) (total duration 583 h). ClampArt-based BG measurements were compared with those obtained with a laboratory reference method. Clamp quality was assessed by 5 parameters: (1) difference (mg/dl) of all paired BG measurements of ClampArt versus reference method ("trueness"), (2) coefficient of variation (CV, %) of ClampArt's BG measurements at target clamp level ("precision"), (3) mean absolute relative difference (MARD, %) at target clamp level ("accuracy"), (4) difference (mg/dl) between ClampArt and target BG ("control deviation"), and (5) percentage operational time ("utility"). ClampArt-based BG measurements showed a trueness of 1.2 ± 2.5 mg/dl. CV and MARD at target BG were 5.5 ± 2.1% and 5.3 ± 2.3%, respectively. There were only small deviations from target level (1.2 ± 1.6 mg/dl). Operational time was as high as 95.4% ± 4.1% (means ± SD). The selected parameters seem to be adequate to characterize clamp quality. The novel, fully automated clamp device ClampArt achieves high clamp quality, which in future trials should be compared with other (automated and manual) clamp methods. © 2015 Diabetes Technology Society.

  2. Micromachined patch-clamp apparatus

    Science.gov (United States)

    Okandan, Murat

    2012-12-04

    A micromachined patch-clamp apparatus is disclosed for holding one or more cells and providing electrical, chemical, or mechanical stimulation to the cells during analysis with the patch-clamp technique for studying ion channels in cell membranes. The apparatus formed on a silicon substrate utilizes a lower chamber formed from silicon nitride using surface micromachining and an upper chamber formed from a molded polymer material. An opening in a common wall between the chambers is used to trap and hold a cell for analysis using the patch-clamp technique with sensing electrodes on each side of the cell. Some embodiments of the present invention utilize one or more electrostatic actuators formed on the substrate to provide mechanical stimulation to the cell being analyzed, or to provide information about mechanical movement of the cell in response to electrical or chemical stimulation.

  3. Clamp wins pipe repair prize

    Energy Technology Data Exchange (ETDEWEB)

    Anon.

    2001-04-01

    This paper describes the permanent pipeline repair system, developed by Tekmar, which is powered by seawater hydraulics and is easily installed and tested by any workclass remotely operated vehicle (rov). Details are given of the two main components of the system, namely, the diverless high pressure split repair clamp and the rov-operated tool to install it.

  4. Hot clamp design for LMFBR piping systems

    International Nuclear Information System (INIS)

    Kobayashi, T.; Tateishi, M.

    1990-01-01

    Thin wall large diameter piping for liquid metal fast breeder reactor plants can be subjected to significant thermal transients during reactor scrams. To reduce local thermal stresses, an insulted cold clamp was designed for the Fast Flux Test Facility and was also applied to some following prototype reactors. However, the cost minimization of LMFBR requires much simpler designs. This paper presents a hot clamp design concept, which uses standard clamp halves directly attached to the pipe surface with an initial gap. Combinations of flexible pipe and rigid clamp achieved a self-control effect on clamp induced pipe stresses due to the initial gap. A 3-D contact and inelastic history analysis were performed to verify the hot clamp concept. Considerations to reduce the initial stress at installation, to mitigate the clamp restraint on the pipe expansion during thermal shocks, and to maintain the pipe-clamp stiffness desired during a seismic event are discussed

  5. Hot clamp design for LMFBR piping systems

    International Nuclear Information System (INIS)

    Kobayashi, T.; Tateishi, M.

    1993-01-01

    Thin-wall, large-diameter piping for liquid metal fast breeder reactor (LMFBR) plants can be subjected to significant thermal transients during reactor scrams. To reduce local thermal stresses, an insulated cold clamp was designed for the fast flux test facility and was also applied to some prototype reactors thereafter. However, the cost minimization of LMFBR requires much simpler designs. This paper presents a hot clamp design concept, which uses standard clamp halves directly attached to the pipe surface leaving an initial gap. Combinations of flexible pipe and rigid clamp achieved a self-control effect on clamp-induced pipe stresses due to the initial gap. A 3-D contact and inelastic history analysis were performed to verify the hot clamp concept. Considerations to reduce the initial stress at installation, to mitigate the clamp restraint on the pipe expansion during thermal shocks, and to maintain the pipe-clamp stiffness desired during a seismic event were discussed

  6. Multilevel-clamped multilevel converters (MLC2)

    DEFF Research Database (Denmark)

    Rodriguez, Pedro; Bellar, Maria Dias; Muñoz-Aguliar, Raúl Santiago

    2012-01-01

    This letter introduces a new series of multilevel (ML) converters based on the ML clamping concept. By applying this technique, a ML clamping unit (MCU) conveys additional levels for synthesizing the output waveforms of a diode-clampedML dc– ac power converter. The basic building block of the ML...... clamping scheme is the ML clamping cell, which is composed of a pair of dc sources associated with one single-pole/triple-throw type of switch arrangement. The number of series-connected ML-clamping cells will set the number of levels of the synthesized waveform. By depending on the MCU arrangements......, different converter configurations can be derived, namely, the common clamping and the modular types. Both approaches can be accomplished by employing classical three-level neutral-point-clamped (NPC) technology. Thus, the overall structure of the resultant converter is kept simple, wherein the number...

  7. Multifrequency Excitation of a Clamped-Clamped Microbeam

    KAUST Repository

    Jaber, Nizar R.

    2016-01-20

    We present analytical and experimental investigation of an electrically actuated clamped-clamped microbeam under a twosource harmonic excitation. The first frequency is swept around the first mode of vibration where the second one is fixed. These microbeams are fabricated using polyimide as structural layer coated with nickel form top and chromium and gold layers from bottom. We demonstrate the excitation of additive and subtractive type resonance. We show that by properly tuning the frequency and the amplitude of the excitation force, the frequency bandwidth of the resonator is increased. Theoretically, we solved the eigenvalue problem for different axial forces to find the natural frequencies ratio that match the experimental values. Using Galerkin method, a reduced order model is derived to simulate the static and dynamic response of the device where using three symmetric mode shapes provided a good agreement with experimental data. © Copyright 2015 by ASME.

  8. 21 CFR 870.4450 - Vascular clamp.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Vascular clamp. 870.4450 Section 870.4450 Food and... CARDIOVASCULAR DEVICES Cardiovascular Surgical Devices § 870.4450 Vascular clamp. (a) Identification. A vascular clamp is a surgical instrument used to occlude a blood vessel temporarily. (b) Classification. Class II...

  9. Stereotactic biopsy

    International Nuclear Information System (INIS)

    Mwangi, M.N.; Handa, A.

    2006-01-01

    This technology is capable of locating lesions precise detected by the mammography examinations. This devise allows the surgeon to position automatically the needle to perform the cytological/histological biopsy with maximum position accuracy. This is under sterile procedure. to position the lesion in the beam, two radiographic procedures are carried out: the first with the X-ray beam at an inclination of -15 degrees with respect to the position 0 degrees and the second at the inclination +15 degrees. After processing the film the lesion will appear on both radiographs but on light are of the negatoscope. With the cursor information is fed from four points. On the display the length of the needle will appear immediately. The length of the needle to be used in suction is chosen on the basis of the two values on the display. This information fed on the control panel will move the needle unit position where the lesion is. the needle is then introduced under local anaesthesia at the preselected length until it clicks into position. An exposure is made with needle in situ in position at +15 degrees and -15 degrees to ensure the needle is in position. the suction is then carried out and the needle removed. The machine is then reset to return at the initial position

  10. INOVASI SAMBUNGAN MEKANIS MENGGUNAKAN CLAMP BAJA UNTUK TULANGAN BETON

    Directory of Open Access Journals (Sweden)

    Parmo

    2015-12-01

    Full Text Available In the last few years, Indonesian urban growth has tends to be lead to the overground space. This was caused by the significant population increasement the lackness of land availability. The phenomenon is also marked with the increasing number of high-rise buildings and skyscrapers. However, high-rise buildings and skyscrapers have the potential dangers against earthquakes, even more Indonesia lay on an earthquake-prone areas. There are two main things that need to be considered in the planning of earthquake-resistant buildings, which is strength and ductility. Deformation capability and the connection strength between the reinforcement taken into consideration in the design of earthquake-resistant structures. From the steel clamp tensile test results for D13’s mechanical connection reinforcement, it gained 270.69 Mpa for yield strength, 351.45 MPa for ultimate tensile strength and 4757 kg for maximum load with 40% elongation. As for the D16’s mechanical connection reinforcement gained 217.80 MPa for yield strength, 327 605 MPa for ultimate tensile strength and 6717 kg for maximum load with 32% elongation. This study uses two pieces of steel clamp, but in order to obtain a better result then it need to be add more clamps while increasing the steel clamp material quality.

  11. Solution structure of an "open" E. coli Pol III clamp loader sliding clamp complex.

    Science.gov (United States)

    Tondnevis, Farzaneh; Weiss, Thomas M; Matsui, Tsutomu; Bloom, Linda B; McKenna, Robert

    2016-06-01

    Sliding clamps are opened and loaded onto primer template junctions by clamp loaders, and once loaded on DNA, confer processivity to replicative polymerases. Previously determined crystal structures of eukaryotic and T4 clamp loader-clamp complexes have captured the sliding clamps in either closed or only partially open interface conformations. In these solution structure studies, we have captured for the first time the clamp loader-sliding clamp complex from Escherichia coli using size exclusion chromatography coupled to small angle X-ray scattering (SEC-SAXS). The data suggests the sliding clamp is in an open conformation which is wide enough to permit duplex DNA binding. The data also provides information about spatial arrangement of the sliding clamp with respect to the clamp loader subunits and is compared to complex crystal structures determined from other organisms. Published by Elsevier Inc.

  12. Loading dynamics of a sliding DNA clamp.

    KAUST Repository

    Cho, Won-Ki

    2014-05-22

    Sliding DNA clamps are loaded at a ss/dsDNA junction by a clamp loader that depends on ATP binding for clamp opening. Sequential ATP hydrolysis results in closure of the clamp so that it completely encircles and diffuses on dsDNA. We followed events during loading of an E. coli β clamp in real time by using single-molecule FRET (smFRET). Three successive FRET states were retained for 0.3 s, 0.7 s, and 9 min: Hydrolysis of the first ATP molecule by the γ clamp loader resulted in closure of the clamp in 0.3 s, and after 0.7 s in the closed conformation, the clamp was released to diffuse on the dsDNA for at least 9 min. An additional single-molecule polarization study revealed that the interfacial domain of the clamp rotated in plane by approximately 8° during clamp closure. The single-molecule polarization and FRET studies thus revealed the real-time dynamics of the ATP-hydrolysis-dependent 3D conformational change of the β clamp during loading at a ss/dsDNA junction.

  13. The RFC clamp loader: structure and function.

    Science.gov (United States)

    Yao, Nina Y; O'Donnell, Mike

    2012-01-01

    The eukaryotic RFC clamp loader couples the energy of ATP hydrolysis to open and close the circular PCNA sliding clamp onto primed sites for use by DNA polymerases and repair factors. Structural studies reveal clamp loaders to be heteropentamers. Each subunit contains a region of homology to AAA+ proteins that defines two domains. The AAA+ domains form a right-handed spiral upon binding ATP. This spiral arrangement generates a DNA binding site within the center of RFC. DNA enters the central chamber through a gap between the AAA+ domains of two subunits. Specificity for a primed template junction is achieved by a third domain that blocks DNA, forcing it to bend sharply. Thus only DNA with a flexible joint can bind the central chamber. DNA entry also requires a slot in the PCNA clamp, which is opened upon binding the AAA+ domains of the clamp loader. ATP hydrolysis enables clamp closing and ejection of RFC, completing the clamp loading reaction.

  14. The RFC Clamp Loader: Structure and Function

    Science.gov (United States)

    O'Donnell, Mike

    2013-01-01

    The eukaryotic RFC clamp loader couples the energy of ATP hydrolysis to open and close the circular PCNA sliding clamp onto primed sites for use by DNA polymerases and repair factors. Structural studies reveal clamp loaders to be heteropentamers. Each subunit contains a region of homology to AAA+ proteins that defines two domains. The AAA+ domains form a right-handed spiral upon binding ATP. This spiral arrangement generates a DNA binding site within the center of RFC. DNA enters the central chamber through a gap between the AAA+ domains of two subunits. Specificity for a primed template junction is achieved by a third domain that blocks DNA, forcing it to bend sharply. Thus only DNA with a flexible joint can bind the central chamber. DNA entry also requires a slot in the PCNA clamp, which is opened upon binding the AAA+ domains of the clamp loader. ATP hydrolysis enables clamp closing and ejection of RFC, completing the clamp loading reaction. PMID:22918590

  15. Bone lesion biopsy

    Science.gov (United States)

    Bone biopsy; Biopsy - bone ... the cut, then pushed and twisted into the bone. Once the sample is obtained, the needle is ... sample is sent to a lab for examination. Bone biopsy may also be done under general anesthesia ...

  16. Biopsy system for CT-guided biopsies

    International Nuclear Information System (INIS)

    Onik, G.; Cosman, E.; Wells, T.; Goldberg, H.I.; Moss, A.; Costello, P.; Kane, R.

    1987-01-01

    CT stereotaxic brain biopsies have made brain biopsies safe and minimally invasive. CT-guided biopsies of the body, however, have traditionally used a hand-guidance method. CT biopsy guidance systems for the body have recently become available that have similar capabilities as those of brain biopsy systems. To compare the clinical utility of stereotaxically guided biopsies with hand-guided biopsies, the authors prospectively compared 40 biopsies performed with each method. In the stereotaxic method, a localizor grid was placed on the patient to define a reference point, and a frame was used to guide the needle along the intended path. Computer software programs calculated complex paths from one scan plane to another. Although the results disclosed no significant differences in lesion size or path length between the two groups, the stereotaxically guided biopsies required 75% fewer needle manipulations to hit the intended target. Consequently, the stereotaxically guided biopsies required 40% less time and 80% fewer localization scans to find the biopsy needle than did the hand-guided biopsies

  17. Arterial clamping leads to stenosis at clamp sites after femoropopliteal bypass surgery.

    Science.gov (United States)

    Vriens, Bianca H R; Pol, Robert A; Hulsebos, Robin G; van Det, Rob J; van der Palen, Job; Zeebregts, Clark J; Geelkerken, Robert H

    2015-09-01

    To date, the incidence and clinical relevance of arterial stenosis at clamp sites after femoropopliteal bypass surgery is unknown. Ninety-four patients underwent a femoropopliteal bypass in which the arterial inflow and outflow clamp sites were controlled by the Fogarty-Soft-Inlay clamp and marked with an hemoclip. The number of pre-existing atherosclerotic segments, clamp force, and clamp time were recorded and the occurrence of a stenosis at the clamp site was determined. After a mean follow-up of 83 months, a significant stenosis was confirmed at 23 of the 178 clamp sites (12.9%; 95% confidence interval 8.4 to 18.8). The mean number of pre-existing atherosclerotic segments (P = .28) and the mean clamp force (P = .55) was similar between the groups with and without a stenosis. There was a significant difference regarding clamp time between the group with and without a stenosis (38 minutes and 26 minutes, P = .001). Arterial clamping, even with the Fogarty-Soft-Inlay clamp, can lead to clamp stenosis and seems to be related to the duration of clamping, but not to pre-existent atherosclerotic burden. Copyright © 2015 Elsevier Inc. All rights reserved.

  18. To clamp or not to clamp? Long-term functional outcomes for elective off-clamp laparoscopic partial nephrectomy.

    Science.gov (United States)

    Shah, Paras H; George, Arvin K; Moreira, Daniel M; Alom, Manaf; Okhunov, Zhamshid; Salami, Simpa; Waingankar, Nikhil; Schwartz, Michael J; Vira, Manish A; Richstone, Lee; Kavoussi, Louis R

    2016-02-01

    To evaluate whether elective off-clamp laparoscopic partial nephrectomy (LPN) affords long-term renal functional benefit compared with the on-clamp approach. This is a retrospective review of patients who underwent elective LPN between 2006 and 2011. Patients were followed longitudinally for up to 5 years. In all, 315 patients with radiographic evidence of a solitary renal mass and normal-appearing contralateral kidney underwent elective LPN; 209 were performed on-clamp vs 106 off-clamp. One patient who required conversion from LPN to open PN was excluded from the study. Additionally, four patients in the on-clamp cohort who underwent subsequent radical nephrectomy for local-regional recurrence were excluded from longitudinal functional evaluation after their procedure. The primary objective was to evaluate differences in postoperative estimated glomerular filtration rate (eGFR) between hilar clamping groups. Subgroup analyses were performed for patients with clamp times >30 min and those with baseline renal insufficiency (eGFR clamp and off-clamp cohorts (80.7 vs 84.1 mL/min/1.73m(2) , P > 0.05). Univariable and multivariable analyses did not show significant differences in postoperative eGFR between both groups among all-comers, those with clamp times >30 min, and patients with baseline renal insufficiency. Risk of chronic kidney disease was not diminished by the off-clamp approach with up to 5 years of follow-up. Progressive recovery of renal function after hilar clamping in the elective setting eclipses short-term functional benefit achieved with off-clamp LPN by 6 months; there was no significant difference in eGFR or the percentage incidence of chronic kidney disease between the on-clamp and off-clamp cohorts with up to 5 years follow-up. As such, eliminating transient ischaemia during elective LPN does not confer clinical benefit. © 2015 The Authors BJU International © 2015 BJU International Published by John Wiley & Sons Ltd.

  19. Hyperinsulinemic Euglycemic Clamp for cardiac PET: An Initial Experience

    International Nuclear Information System (INIS)

    Agrawal, Saumya; Salgia, Ritu; Baikerikar, Sushanti; Khandare, Hemant; Lele, Vikram

    2007-01-01

    Full text: Aim: To study the adequacy of hyperinsulinemic euglycemic clamp to yield technically adequate and clinically meaningful cardiac scans in diabetic patients. 18 F- FDG scans are of suboptimal quality as high level of glucose competes with flurodeoxyglucose for cardiac uptake. Thus to allow quick stabilization of metabolic environment and to get superior quality images, insulin clamp is an accepted technique. Methods: 8 patients (7 males and 1 female) of ages ranging from 43 to 69 years were evaluated in this ongoing study, referred for estimation of myocardial viability post myocardial infarction. All patients were required 6 hours fasting. Initially they were injected with 20 milicurie of Technetium Tetrofosmin and myocardial perfusion imaging done 1 hour later on GE dual head gamma camera. Blood glucose levels were checked. Their blood sugars were in the range of 130mg% - 170mg%. Insulin clamp was applied depending upon the glucose level obtained, according to ASNC guidelines for PET Myocardial Glucose Metabolism and Perfusion Imaging. On stabilization of blood glucose levels, 10 milicurie of 18 F- FDG was injected. Imaging was done 1 hour later on Dedicated 16 slice STE PET CT scanner. There was no incidence of hypoglycemia or any other side effects during the procedure. Entire procedure including tetrofosmin imaging took approximately 4 hours. Results: Good quality images were obtained after the use of insulin clamp. Conclusion: Infusion of insulin and glucose gives stable plasma glucose and serum insulin levels during imaging. The insulin clamp technique makes it possible to adjust and maintain a metabolic steady state during PET study. It does not alter 18F-FDG uptake patterns in different myocardial areas. It permits the use of smaller FDG doses for the patient and gives superior quality images. The technique is safe and should improve both the clinical use and cost effectiveness of FDG-PET imaging for identification of injured but viable myocardium

  20. Loading dynamics of a sliding DNA clamp.

    Science.gov (United States)

    Cho, Won-Ki; Jergic, Slobodan; Kim, Daehyung; Dixon, Nicholas E; Lee, Jong-Bong

    2014-06-23

    Sliding DNA clamps are loaded at a ss/dsDNA junction by a clamp loader that depends on ATP binding for clamp opening. Sequential ATP hydrolysis results in closure of the clamp so that it completely encircles and diffuses on dsDNA. We followed events during loading of an E. coli β clamp in real time by using single-molecule FRET (smFRET). Three successive FRET states were retained for 0.3 s, 0.7 s, and 9 min: Hydrolysis of the first ATP molecule by the γ clamp loader resulted in closure of the clamp in 0.3 s, and after 0.7 s in the closed conformation, the clamp was released to diffuse on the dsDNA for at least 9 min. An additional single-molecule polarization study revealed that the interfacial domain of the clamp rotated in plane by approximately 8° during clamp closure. The single-molecule polarization and FRET studies thus revealed the real-time dynamics of the ATP-hydrolysis-dependent 3D conformational change of the β clamp during loading at a ss/dsDNA junction. © 2014 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA. This is an open access article under the terms of the Creative Commons Attribution Non-Commercial NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

  1. Biopsy - Multiple Languages

    Science.gov (United States)

    ... 简体中文) Expand Section Biopsy - 简体中文 (Chinese, Simplified (Mandarin dialect)) Bilingual PDF Health Information Translations Bone Marrow Biopsy - 简体中文 (Chinese, Simplified (Mandarin dialect)) ...

  2. State of the art of pipe clamp analysis

    International Nuclear Information System (INIS)

    Fang, P.J.

    1984-01-01

    Various types of clamps are used as a component of piping support structures in nuclear power plants. The clamp is referred to as a nonintegral attachment to pipe in contrast to lugs which are integrally welded to the pipe wall. An analysis to determine the load capacity of a clamp is complicated by the fact that the distribution of contact stresses acting on the clamp-pipe interface is a nonlinearly dependent on the geometry of the clamp and pipe, clamping force preapplied to the clamp, and external loads. This paper reviews various methods of clamp analysis including both the closed-formed solutions and the finite element approach. While conventional two- and three-bolt clamps for a horizontal pipe run are emphasized, stiff clamps and riser clamps are also discussed. Finally, the potential effects of interaction between the clamp and pipe are evaluated. (Author) [pt

  3. The diagnostic value of liver biopsy

    Directory of Open Access Journals (Sweden)

    Zimmermann Arthur

    2001-10-01

    Full Text Available Abstract Background Since the introduction of molecular diagnostic tools such as markers for hepatitis C and different autoimmune diseases, liver biopsy is thought to be useful mainly for staging but not for diagnostic purposes. The aim was to review the liver biopsies for 5 years after introduction of testing for hepatitis C, in order to evaluate what diagnostic insights – if any – remain after serologic testing. Methods Retrospective review of all liver biopsies performed between 1.1.1995 and 31.12.1999 at an academic outpatient hepatology department. The diagnoses suspected in the biopsy note were compared with the final diagnosis arrived at during a joint meeting with the responsible clinicians and a hepatopathologist. Results In 365 patients, 411 diagnoses were carried out before biopsy. 84.4 % were confirmed by biopsy but in 8.8 %, 6.8 % and 10.5 % the diagnosis was specified, changed or a diagnosis added, respectively. Additional diagnoses of clinical relevance were unrecognized biliary obstruction and additional alcoholic liver disease in patients with chronic hepatitis C. Liver biopsy led to change in management for 12.1 % of patients. Conclusion Even in the era of advanced virological, immunological and molecular genetic testing, liver biopsy remains a useful diagnostic tool. The yield is particularly high in marker negative patients but also in patients with a clear-cut prebiopsy diagnosis, liver biopsy can lead to changes in patient management.

  4. Prediction of clamp-derived insulin sensitivity from the oral glucose insulin sensitivity index

    DEFF Research Database (Denmark)

    Tura, Andrea; Chemello, Gaetano; Szendroedi, Julia

    2018-01-01

    that underwent both a clamp and an OGTT or meal test, thereby allowing calculation of both the M value and OGIS. The population was divided into a training and a validation cohort (n = 359 and n = 154, respectively). After a stepwise selection approach, the best model for M value prediction was applied......AIMS/HYPOTHESIS: The euglycaemic-hyperinsulinaemic clamp is the gold-standard method for measuring insulin sensitivity, but is less suitable for large clinical trials. Thus, several indices have been developed for evaluating insulin sensitivity from the oral glucose tolerance test (OGTT). However......, most of them yield values different from those obtained by the clamp method. The aim of this study was to develop a new index to predict clamp-derived insulin sensitivity (M value) from the OGTT-derived oral glucose insulin sensitivity index (OGIS). METHODS: We analysed datasets of people...

  5. Ultrasound guided closed pleural biopsy versus medical thoracoscopic pleural biopsy in diagnosis of pleural diseases

    Directory of Open Access Journals (Sweden)

    K. Sobhy

    2017-01-01

    Conclusion: Both TUS guided pleural biopsy and medical thoracoscopic pleural biopsy are available to diagnose different pleural lesions each of which has its advantages and disadvantages. The proper selection of the patients for each modality will result in raising the diagnostic yield of both modalities. TUS examination before medical thoracoscopy will allow proper selection of patients, reduce incidence of complications, guide for the best site of entry and raisethe diagnostic yield of medical thoracoscopy.

  6. Delayed culture of Leishmania in skin biopsies.

    Science.gov (United States)

    Dedet, J P; Pratlong, F; Pradinaud, R; Moreau, B

    1999-01-01

    Between January 1997 and October 1998, 16 skin biopsies collected from 13 patients with cutaneous leishmaniasis in French Guiana were inoculated in culture medium after travel for 3-17 days from the place of biopsy to the culture laboratory in France. Each biopsy fragment was introduced near the flame of a Bunsen burner into the transport medium (RPMI medium supplemented with 10% fetal calf serum) which was maintained at ambient temperature during postal delivery to France. In France the biopsies were ground in sterile saline before being inoculated into NNN culture tubes. The cultures were incubated at 25 degrees C and subcultured every week until the 5th week. The cultures were positive in 9 cases, remained negative in 4, and were contaminated in 3 cases. Positive results were obtained at all seasons and for 3 different Leishmania species. The study indicates that delayed culture can yield useful results from biopsies taken in field conditions.

  7. Molecular Mechanisms of DNA Polymerase Clamp Loaders

    Science.gov (United States)

    Kelch, Brian; Makino, Debora; Simonetta, Kyle; O'Donnell, Mike; Kuriyan, John

    Clamp loaders are ATP-driven multiprotein machines that couple ATP hydrolysis to the opening and closing of a circular protein ring around DNA. This ring-shaped clamp slides along DNA, and interacts with numerous proteins involved in DNA replication, DNA repair and cell cycle control. Recently determined structures of clamp loader complexes from prokaryotic and eukaryotic DNA polymerases have revealed exciting new details of how these complex AAA+ machines perform this essential clamp loading function. This review serves as background to John Kuriyan's lecture at the 2010 Erice School, and is not meant as a comprehensive review of the contributions of the many scientists who have advanced this field. These lecture notes are derived from recent reviews and research papers from our groups.

  8. Core clamping device for a nuclear reactor

    International Nuclear Information System (INIS)

    Guenther, R.W.

    1974-01-01

    The core clamping device for a fast neutron reactor includes clamps to support the fuel zone against the pressure vessel. The clamps are arranged around the circumference of the core. They consist of torsion bars arranged parallel at some distance around the core with lever arms attached to the ends whose force is directed in the opposite direction, pressing against the wall of the pressure vessel. The lever arms and pressure plates also actuated by the ends of the torsion bars transfer the stress, the pressure plates acting upon the fuel elements or fuel assemblies. Coupling between the ends of the torsion bars and the pressure plates is achieved by end carrier plates directly attached to the torsion bars and radially movable. This clamping device follows the thermal expansions of the core, allows specific elements to be disengaged in sections and saves space between the core and the neutron reflectors. (DG) [de

  9. Formal Design Review Foot Clamp Modification

    International Nuclear Information System (INIS)

    OTEN, T.C.

    2000-01-01

    This report documents the Design Review performed for the foot clamp modification. The report documents the acceptability of the design, identifies the documents that were reviewed, the scope of the review and the members of the review team

  10. Clamp force and alignment checking device

    Science.gov (United States)

    Spicer, John Patrick; Cai, Wayne W.; Chakraborty, Debejyo; Mink, Keith

    2017-04-11

    A check fixture measures a total clamp force applied by a welder device. The welder device includes a welding horn having a plurality of weld pads and welding anvil having a plurality of weld pads. The check fixture includes a base member operatively supporting a plurality of force sensors. The base member and the force sensors are received between the weld pads of the welding horn and the anvil pads of the welding anvil. Each force sensor is configured to measure an individual clamp force applied thereto by corresponding weld and anvil pads when the base member is received between the welding horn and the welding anvil and the welder device is in the clamped position. The individual clamp forces are used to determine whether the weld and/or anvil pads are worn or misaligned.

  11. Ultrasound-Guided Breast Biopsy

    Science.gov (United States)

    ... Physician Resources Professions Site Index A-Z Ultrasound-Guided Breast Biopsy An ultrasound-guided breast biopsy uses ... of Ultrasound-Guided Breast Biopsy? What is Ultrasound-Guided Breast Biopsy? Lumps or abnormalities in the breast ...

  12. Sound absorption by clamped poroelastic plates.

    Science.gov (United States)

    Aygun, H; Attenborough, K

    2008-09-01

    Measurements and predictions have been made of the absorption coefficient and the surface acoustic impedance of poroelastic plates clamped in a large impedance tube and separated from the rigid termination by an air gap. The measured and predicted absorption coefficient and surface impedance spectra exhibit low frequency peaks. The peak frequencies observed in the absorption coefficient are close to those predicted and measured in the deflection spectra of the clamped poroelastic plates. The influences of the rigidity of the clamping conditions and the width of the air gap have been investigated. Both influences are found to be important. Increasing the rigidity of clamping reduces the low frequency absorption peaks compared with those measured for simply supported plates or plates in an intermediate clamping condition. Results for a closed cell foam plate and for two open cell foam plates made from recycled materials are presented. For identical clamping conditions and width of air gap, the results for the different materials differ as a consequence mainly of their different elasticity, thickness, and cell structure.

  13. Optimisation of sonourethrography: the clamp method.

    Science.gov (United States)

    Berná-Mestre, Juan de Dios; Balmaceda, Thierry; Martínez, Diego; Escudero, Jose F; Martínez, Gloria; García, José A; Canteras, Manuel; Berná-Serna, Juan D

    2018-05-01

    To describe the clamp method for performing retrograde sonourethrography (RSUG) and contrast-enhanced voiding sonourethrography (CE-VSUG) via the transperineal approach in male adults. Prospective study of 113 males (14-86 years) with urethral strictures confirmed by urethrography who received sonourethrography via the clamp method between 2011 and 2015. The characteristic parameters of the quantitative variables were calculated and a comparative analysis of the qualitative variables was conducted using the McNemar test. RSUG was performed successfully in all the cases (n = 113) and detected 49 cases with anterior urethral strictures; the strictures in the proximal bulbar cone in five of them (10.2%) were not visualised on retrograde urethrography (RUG) (p clamp method enables RSUG and CE-VSUG to be performed simply, effectively and painlessly by a single operator. It also allows the evaluation of cases with urethromeatal alterations (stricture, hypospadias and meatotomy). • The clamp method enables RSUG to be performed simply and painlessly. • The clamp method requires only one operator and allows assessing urethromeatal alterations. • RSUG shows greater capacity for detecting anterior urethral strictures than RUG. • The clamp method achieves retrograde bladder filling in approximately 6 min. • CE-VSUG shows greater capacity for detecting strictures than VCUG.

  14. Use of the Satinsky clamp for hilar clamping during robotic partial nephrectomy: indications, technique, and multi-center outcomes.

    Science.gov (United States)

    Abdullah, Newaj; Rahbar, Haider; Barod, Ravi; Dalela, Deepansh; Larson, Jeff; Johnson, Michael; Mass, Alon; Zargar, Homayoun; Kaouk, Jihad; Allaf, Mohamad; Bhayani, Sam; Stifelman, Michael; Rogers, Craig

    2017-03-01

    A Satinsky clamp may be a backup option for hilar clamping during robotic partial nephrectomy (RPN) if there are challenges with application of bulldog clamps, but there are potential safety concerns. We evaluate outcomes of RPN using Satinsky vs. bulldog clamps, and provide tips for safe use of the Satinsky as a backup option. Using a multi-center database, we identified 1073 patients who underwent RPN between 2006 and 2013, and had information available about method of hilar clamping (bulldog clamp vs. Satinsky clamp). Patient baseline characteristics, tumor features, and perioperative outcomes were compared between the Satinsky and bulldog clamp groups. A Satinsky clamp was used for hilar clamping in 94 (8.8 %) RPN cases, and bulldog clamps were used in 979 (91.2 %) cases. The use of a Satinsky clamp was associated with greater operative time (198 vs. 175 min, p clamp group, but none were directly related to the Satinsky clamp. On multivariable analysis, the use of the Satinsky clamp was not associated with increase in intraoperative or Clavien ≥3 postoperative complications, positive surgical margin rate or percentage change in estimated glomerular filtration rate. A Satinsky clamp can be a backup option for hilar clamping during challenging RPN cases, but requires careful technique, and was rarely necessary.

  15. Temno biopsy needle

    International Nuclear Information System (INIS)

    Quinn, S.F.; Demlow, T.; Dunkley, B.

    1991-01-01

    This paper reports on the Temno needle which is spring-activated biopsy needle that is being marketed to radiologists as a needle that can obtain histologic cores. One hundred fifteen biopsy procedures were performed; biopsy sites included liver; retroperitoneum; lung, mediastinum, and pleura; musculoskeletal structures; thyroid; abdominal and pelvic masses; and pancreas. The needle sizes included 21-gauge, 18-gauge, 16-gauge, and 14-gauge needles. The biopsy procedures were diagnostic in 87.8D% of cases, and the average biopsy specimen measured 1.0-40.0 mm. The biopsy diagnoses included both malignant and benign processes. The Temno needle has a lightweight, nonattenuating handle that makes it especially useful for CT-guided procedures

  16. Timing embryo biopsy for PGD - before or after cryopreservation?

    Science.gov (United States)

    Shinar, S; Kornecki, N; Schwartz, T; Mey-Raz, N; Amir, H; Almog, B; Shavit, T; Hasson, J

    2016-09-01

    Pre-implantation genetic diagnosis (PGD) is required in order to screen and diagnose embryos of patients at risk of having a genetically affected offspring. A biopsy to diagnose the genetic profile of the embryo may be performed either before or after cryopreservation. The aim of this study was to determine which biopsy timing yields higher embryo survival rates. Retrospective cohort study of all PGD patients in a public IVF unit between 2010 and 2013. Inclusion criteria were patients with good-quality embryos available for cryopreservation by the slow freezing method. Embryos were divided into two groups: biopsy before and biopsy after cryopreservation. The primary outcome was embryo survival rates post thawing. Sixty-five patients met inclusion criteria. 145 embryos were biopsied before cryopreservation and 228 embryos were cryopreserved and biopsied after thawing. Embryo survival was significantly greater in the latter group (77% vs. 68%, p Cryopreservation preceding biopsy results in better embryo survival compared to biopsy before cryopreservation.

  17. 21 CFR 882.4460 - Neurosurgical head holder (skull clamp).

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Neurosurgical head holder (skull clamp). 882.4460... holder (skull clamp). (a) Identification. A neurosurgical head holder (skull clamp) is a device used to clamp the patient's skull to hold head and neck in a particular position during surgical procedures. (b...

  18. Arterial clamping leads to stenosis at clamp sites after femoropopliteal bypass surgery

    NARCIS (Netherlands)

    Vriens, Bianca H.R.; Pol, Robert A.; Hulsebos, Robin G.; van Det, Rob J.; van der Palen, Jacobus Adrianus Maria; Zeebregts, Clark J.; Geelkerken, Robert H.

    2015-01-01

    Background To date, the incidence and clinical relevance of arterial stenosis at clamp sites after femoropopliteal bypass surgery is unknown. Methods Ninety-four patients underwent a femoropopliteal bypass in which the arterial inflow and outflow clamp sites were controlled by the Fogarty-Soft-Inlay

  19. Arterial clamping leads to stenosis at clamp sites after femoropopliteal bypass surgery

    NARCIS (Netherlands)

    Vriens, Bianca H. R.; Pol, Robert A.; Hulsebos, Robin G.; van Det, Rob J.; van der Palen, Job; Zeebregts, Clark J.; Geelkerken, Robert H.

    BACKGROUND: To date, the incidence and clinical relevance of arterial stenosis at clamp sites after femoropopliteal bypass surgery is unknown. METHODS: Ninety-four patients underwent a femoropopliteal bypass in which the arterial inflow and outflow clamp sites were controlled by the

  20. Piezoresistive cantilever force-clamp system

    International Nuclear Information System (INIS)

    Park, Sung-Jin; Petzold, Bryan C.; Pruitt, Beth L.; Goodman, Miriam B.

    2011-01-01

    We present a microelectromechanical device-based tool, namely, a force-clamp system that sets or ''clamps'' the scaled force and can apply designed loading profiles (e.g., constant, sinusoidal) of a desired magnitude. The system implements a piezoresistive cantilever as a force sensor and the built-in capacitive sensor of a piezoelectric actuator as a displacement sensor, such that sample indentation depth can be directly calculated from the force and displacement signals. A programmable real-time controller operating at 100 kHz feedback calculates the driving voltage of the actuator. The system has two distinct modes: a force-clamp mode that controls the force applied to a sample and a displacement-clamp mode that controls the moving distance of the actuator. We demonstrate that the system has a large dynamic range (sub-nN up to tens of μN force and nm up to tens of μm displacement) in both air and water, and excellent dynamic response (fast response time, <2 ms and large bandwidth, 1 Hz up to 1 kHz). In addition, the system has been specifically designed to be integrated with other instruments such as a microscope with patch-clamp electronics. We demonstrate the capabilities of the system by using it to calibrate the stiffness and sensitivity of an electrostatic actuator and to measure the mechanics of a living, freely moving Caenorhabditis elegans nematode.

  1. IMPORTANT: Fluke is recalling Digital Clamp Meters

    CERN Multimedia

    2013-01-01

    Fluke is voluntarily recalling four models of Digital Clamp Meters: Fluke 373, 374, 375 and 376. If you own one of these clamp meters, please stop using it and send it back to Fluke for repair even if you have not experienced problems.   Description of the problem: "The printed circuit assembly may not be properly fastened to the test lead input jack. This may result in inaccurate voltage readings, including a low or no-voltage reading on a circuit energised with a hazardous voltage, presenting a shock, electrocution or thermal burn hazard." To determine if your clamp meter is affected by this recall notice, and for more information, click here.

  2. Kinetic analysis of PCNA clamp binding and release in the clamp loading reaction catalyzed by Saccharomyces cerevisiae replication factor C.

    Science.gov (United States)

    Marzahn, Melissa R; Hayner, Jaclyn N; Meyer, Jennifer A; Bloom, Linda B

    2015-01-01

    DNA polymerases require a sliding clamp to achieve processive DNA synthesis. The toroidal clamps are loaded onto DNA by clamp loaders, members of the AAA+family of ATPases. These enzymes utilize the energy of ATP binding and hydrolysis to perform a variety of cellular functions. In this study, a clamp loader-clamp binding assay was developed to measure the rates of ATP-dependent clamp binding and ATP-hydrolysis-dependent clamp release for the Saccharomyces cerevisiae clamp loader (RFC) and clamp (PCNA). Pre-steady-state kinetics of PCNA binding showed that although ATP binding to RFC increases affinity for PCNA, ATP binding rates and ATP-dependent conformational changes in RFC are fast relative to PCNA binding rates. Interestingly, RFC binds PCNA faster than the Escherichia coli γ complex clamp loader binds the β-clamp. In the process of loading clamps on DNA, RFC maintains contact with PCNA while PCNA closes, as the observed rate of PCNA closing is faster than the rate of PCNA release, precluding the possibility of an open clamp dissociating from DNA. Rates of clamp closing and release are not dependent on the rate of the DNA binding step and are also slower than reported rates of ATP hydrolysis, showing that these rates reflect unique intramolecular reaction steps in the clamp loading pathway. Copyright © 2014 Elsevier B.V. All rights reserved.

  3. Improved transvenous liver biopsy needle

    DEFF Research Database (Denmark)

    Henriksen, Jens Henrik Sahl; Matzen, P; Christoffersen, P

    1979-01-01

    A modified type of the standard transvenous cholangiography biopsy needle is described. The modified tranvenous liver biopsy needle caused only minimal artefactual changes of the liver biopsy specimens. The new type of biopsy needle is a modified Menghini needle. The conventional Menghini needle...... should be avoided for transvenous catheter biopsies because of risk of leaving catheter fragments in the liver....

  4. Tuning permanent magnets with adjustable field clamps

    International Nuclear Information System (INIS)

    Schermer, R.I.

    1987-01-01

    The effective length of a permanent-magnet assembly can be varied by adjusting the geometrical parameters of a field clamp. This paper presents measurements on a representative dipole and quadrupole as the field clamp is withdrawn axially or radially. The detailed behavior depends upon the magnet multipolarity and geometry. As a rule-of-thumb, a 3-mm-thick iron plate placed at one end plane of the magnet will shorten the length by one-third of the magnet bore radius

  5. Clamp loader ATPases and the evolution of DNA replication machinery

    Science.gov (United States)

    2012-01-01

    Clamp loaders are pentameric ATPases of the AAA+ family that operate to ensure processive DNA replication. They do so by loading onto DNA the ring-shaped sliding clamps that tether the polymerase to the DNA. Structural and biochemical analysis of clamp loaders has shown how, despite differences in composition across different branches of life, all clamp loaders undergo the same concerted conformational transformations, which generate a binding surface for the open clamp and an internal spiral chamber into which the DNA at the replication fork can slide, triggering ATP hydrolysis, release of the clamp loader, and closure of the clamp round the DNA. We review here the current understanding of the clamp loader mechanism and discuss the implications of the differences between clamp loaders from the different branches of life. PMID:22520345

  6. Nonfocal renal biopsies: adequacy and factors affecting a successful outcome.

    Science.gov (United States)

    Goldstein, Mark A; Atri, Mostafa; O'Malley, Martin; Jacks, Lindsay; John, Rohan; Herzenberg, Andrew; Reich, Heather; Ghai, Sangeet

    2013-01-01

    The purpose of this study was to evaluate factors affecting the success of ultrasound-guided core biopsy of kidneys and determine the optimum number of passes. This retrospective study evaluated 484 nonfocal renal biopsies performed with 18-gauge side-notch biopsy needles. Number of biopsy passes, serum creatinine, body mass index, needle type, transplant age, kidney size, diabetic status, and operator were evaluated as predictors of the number of biopsy passes. Four hundred seventy-four biopsies (338 transplant, 136 native) were included with mean number of passes 2.87 (3.1 native vs 2.78 transplant; P = 0.002). Mean number of glomeruli yielded per pass was 6.9 (7.2 transplant vs 6.1 native; P = 0.0002) with 3 passes adequate for histological diagnosis in 84% of biopsies. Native kidney, increasing serum creatinine level, trainee biopsy operator, and use of a Temno needle were found to be independent predictors of having more than 3 biopsy passes on multivariate analysis. Age, sex, body mass index, diabetic status, and kidney size were not associated with the number of biopsy passes. The success of a nonfocal renal biopsy has many influencing variables, and in the absence of an on-site electron microscopy technologist to immediately evaluate biopsy samples, 3 passes with an 18-gauge needle would be adequate in 84% of kidneys to achieve a histological diagnosis, with 2 passes needed for transplant kidneys to meet the Banff 97 criteria.

  7. Stereotactic biopsy for brainstem lesion: Comparison of approaches and reports of 10 cases

    Directory of Open Access Journals (Sweden)

    Se-Yi Chen

    2011-03-01

    Conclusion: A number of approaches are available for stereotactic brainstem biopsy. Surgical approach should be tailored, according to the location neurological function, with special concern for the patients’ safety. In selected condition, frameless stereotaxy biopsy also provides competed diagnostic yield.

  8. ANALYTICAL BENDING SOLUTION OF ALL CLAMPED ISOTROPIC ...

    African Journals Online (AJOL)

    The analytical bending solution of all clamped rectangular plate on Winkler foundation using characteristic orthogonal polynomials (COPs) was studied. This was achieved by partially integrating the governing differential equation of rectangular plate on elastic foundation four times with respect to its independents x and y ...

  9. Γ-source Neutral Point Clamped Inverter

    DEFF Research Database (Denmark)

    Mo, Wei; Loh, Poh Chiang; Blaabjerg, Frede

    Transformer based Z-source inverters are recently proposed to achieve promising buck-boost capability. They have improved higher buck-boost capability, smaller size and less components count over Z-source inverters. On the other hand, neutral point clamped inverters have less switching stress...

  10. AN ACTIVE VALVE WITH A CLAMPED MEMBRANE

    DEFF Research Database (Denmark)

    2009-01-01

    An active valve for use e.g. in fluidic microsystems is provided, wherein the active valve comprises a membrane having at least one flow gate, arranged between a first and a second substantially rigid element. Adjusting means provides an adjustment of the clamping force on membrane arranged between...

  11. Clamp and Gas Nozzle for TIG Welding

    Science.gov (United States)

    Gue, G. B.; Goller, H. L.

    1982-01-01

    Tool that combines clamp with gas nozzle is aid to tungsten/inert-gas (TIG) welding in hard-to-reach spots. Tool holds work to be welded while directing a stream of argon gas at weld joint, providing an oxygen-free environment for tungsten-arc welding.

  12. VELO Module Production - Cable and Clamp Attachment

    CERN Document Server

    Smith, N A

    2007-01-01

    This note describes in detail the procedures used in the fixing of the clamps to hold the cables in position on the pedestal in the final module assembly for the LHCb VELO detector modules. It summarizes the effects on the module of applying the cables.

  13. Mediastinoscopy with biopsy

    Science.gov (United States)

    ... This procedure is also done for certain infections (tuberculosis, sarcoidosis) and autoimmune disorders . ... Biopsies of lymph node tissues are normal and do not show signs of cancer or infection.

  14. Salivary gland biopsy

    Science.gov (United States)

    ... biopsy References Miloro M, Kolokythas A. Diagnosis and management of salivary gland disorders. In: Hupp JR, Ellis E, Tucker MR, eds. Contemporary Oral and Maxillofacial Surgery . 6th ed. St Louis, ...

  15. Colposcopy - directed biopsy

    Science.gov (United States)

    ... squamous cells - colposcopy; Pap smear - colposcopy; HPV - colposcopy; Human papilloma virus - colposcopy; Cervix - colposcopy; Colposcopy ... also called cervical dysplasia) Cervical warts (infection with human papilloma virus , or HPV) If the biopsy does not determine ...

  16. Biopsy (For Parents)

    Science.gov (United States)

    ... is taking or whether your child has any allergies. Be sure to report any bleeding tendencies in your child, and whether your daughter might be pregnant. Some biopsies require only local anesthesia. Others require sedation or general anesthesia. If that's ...

  17. Biopsy in Musculoskeletal Tumors

    Directory of Open Access Journals (Sweden)

    Mohammad Gharehdaghi

    2014-09-01

    Full Text Available Diagnosis of bone tumors is based on careful evaluation of clinical, imaging and a pathologic findings. So the biopsy of bone and soft tissue sarcomas is the final step in evaluation and a fundamental step in the diagnosis of the lesion. It should not be performed as a shortcut to diagnosis (1. The biopsy should be performed in order to confirm the diagnosis and differentiate among few diagnoses after careful staged studies. Real and artificial changes in imaging studies will be superimposed after performing biopsy, which may alter the interpretation if done after biopsy is taken (1. The correct management of a sarcoma depends on the accurate diagnosis. Inadequate, inapprppriate, or inaccurate non-representative biopsy leads to poorer outcome in terms of survivorship and limb salvage. An incorrect, unplanned incision and biopsy may unnecessarily contaminate uninvolved compartments which may convert a salvageable limb to amputation. Anatomic approach along with the proper biopsy techniques may lead to success or catastrophe. It is clear that in patients with inappropriate biopsy, the chance of the need to change the treatment to more radical than would originally be expected is significantly higher. Also it is more probable to need to  convert curative to palliative treatment and to require adjuvant radiotherapy in patients with inappropriate biopsies. Patients with sarcoma are best served by early referral to a specialized center where staged investigations and biopsy can be performed with minimal morbidity (3. Open biopsy is still considered the gold standard; however, recent studies suggest comparable results with percutaneous core needle biopsy. Our study on 103 consecutive CNB and open biopsy showed comparable results as well. Surgeons need to answer to two questions prior to performing a biopsy: 1-          Where is the best part of the lesion to be biopsied? 2-          What is the safest route without contaminating

  18. Cerebral haemodynamics during carotid cross-clamping.

    Science.gov (United States)

    Pistolese, G R; Ippoliti, A; Appolloni, A; Ronchey, S; Faraglia, V

    1993-03-01

    Carotid artery cross-clamping ischaemia during carotid endarterectomy (CEA) causes 5-30% of perioperative neurological deficits. This study was performed to identify possible clinical situations at higher risk for carotid cross-clamping ischaemia. 606 consecutive patients underwent CEA and were retrospectively studied; they were grouped according to risk factors, presence of associated vascular diseases, clinical pattern, angiographic and CT scan findings. Stump pressure measurement was provided in all patients, perioperative monitoring during CEA was performed by electroencephalogram (EEG) in 469 (77%) and somatosensorial evoked potentials (SEP) in 137 (23%). Local anaesthesia was used in 88 (14.5%) patients. Ischaemic changes during carotid cross-clamping were registered in 118 patients (19.5%). The incidence of cross-clamping ischaemia was then related to different factors; it affected 5.6% of asymptomatics, 25.4% of patients with fixed stroke and 38.5% of those with stenosis and contralateral occlusion. Angiographic and clinical correlation showed that patients with more severe lesions are mostly affected by clamping ischaemia (up to 55% in those with stroke and stenosis with contralateral occlusion). Age, hypertension and diabetes do not significantly affect incidence of ischaemic changes. Positive CT scan increased this risk; statistical relevance was found in regard to patients with unilateral or bilateral stenosis and in those with transient ischaemic attacks. A higher risk can be expected for subjects with more severe clinical and instrumental findings, even if no patients can be considered completely at risk or risk free. Perioperative monitoring is always mandatory and is of great importance in detecting ischaemic changes and preventing cerebral damage using a temporary intraluminal shunt.

  19. Corpus vitreum, retina og chorioidea biopsi

    DEFF Research Database (Denmark)

    Scherfig, Erik Christian Høegh

    2002-01-01

    oftalmology, biopsy, choroid, corpus vitreum, retina, malignant melanoma, biopsy technic, retinoblastoma......oftalmology, biopsy, choroid, corpus vitreum, retina, malignant melanoma, biopsy technic, retinoblastoma...

  20. Duodenal versus jejunal biopsies in suspected celiac disease

    NARCIS (Netherlands)

    Thijs, WJ; van Baarlen, J; Kleibeuker, JH; Kolkman, JJ

    2004-01-01

    Background and Study Aims: In the past, small-bowel biopsies for diagnosis of celiac disease were taken from the jejunum with a suction capsule, but nowadays most physicians take endoscopic biopsies from the distal duodenum. To validate that practice we compared the diagnostic yield of endoscopic

  1. Percutaneous CT-guided needle biopsies of musculoskeletal tumors: a 5-year analysis of non-diagnostic biopsies

    Energy Technology Data Exchange (ETDEWEB)

    Chang, Connie Y.; Huang, Ambrose J.; Bredella, Miriam A.; Torriani, Martin; Rosenthal, Daniel I. [Massachusetts General Hospital, Division of Musculoskeletal Imaging and Intervention, Department of Radiology, Boston, MA (United States); Halpern, Elkan F. [Massachusetts General Hospital, Institute for Technology Assessment, Department of Radiology, Boston, MA (United States); Springfield, Dempsey S. [Massachusetts General Hospital, Department of Orthopedics, Boston, MA (United States)

    2015-12-15

    To study non-diagnostic CT-guided musculoskeletal biopsies and take steps to minimize them. Specifically we asked: (1) What malignant diagnoses have a higher non-diagnostic rate? (2) What factors of a non-diagnostic biopsy may warrant more aggressive pursuit? (3) Do intra-procedural frozen pathology (FP) or point-of-care (POC) cytology reduce the non-diagnostic biopsy rate ?This study was IRB-approved and HIPAA-compliant. We retrospectively reviewed 963 consecutive CT-guided musculoskeletal biopsies. We categorized pathology results as malignant, benign, or non-diagnostic and recorded use of FP or POC cytology. Initial biopsy indication, final diagnosis, method of obtaining the final diagnosis of non-diagnostic biopsies, age of the patient, and years of biopsy attending experience were recorded. Groups were compared using Pearson's χ{sup 2} test or Fisher's exact test. In all, 140 of 963 (15 %) biopsies were non-diagnostic. Lymphoma resulted in more non-diagnostic biopsies (P < 0.0001). While 67% of non-diagnostic biopsies yielded benign diagnoses, 33% yielded malignant diagnoses. Patients whose percutaneous biopsy was indicated due to the clinical context without malignancy history almost always generated benign results (96 %). Whereas 56% of biopsies whose indication was an imaging finding of a treatable lesion were malignant, 20% of biopsies whose indication was a history of malignancy were malignant. There was no statistically significant difference in the nondiagnostic biopsy rates of pediatric versus adult patients (P = 0.8) and of biopsy attendings with fewer versus more years of experience (P = 0.5). The non-diagnostic rates of biopsies with FP (8 %), POC cytology (25 %), or neither (24 %) were significantly different (P < 0.0001). Lymphoma is the malignant diagnosis most likely to result in a non-diagnostic biopsy. If the clinical and radiologic suspicion for malignancy is high, repeat biopsy is warranted. If the clinical context suggests a

  2. Pipe clamp effects on thin-walled pipe design

    International Nuclear Information System (INIS)

    Lindquist, M.R.

    1980-01-01

    Clamp induced stresses in FFTF piping are sufficiently large to require structural assessment. The basic principles and procedures used in analyzing FFTF piping at clamp support locations for compliance with ASME Code rules are given. Typical results from a three-dimensional shell finite element pipe model with clamp loads applied over the clamp/pipe contact area are shown. Analyses performed to categorize clamp induced piping loads as primary or secondary in nature are described. The ELCLAMP Computer Code, which performs analyses at clamp locations combining clamp induced stresses with stresses from overall piping system loads, is discussed. Grouping and enveloping methods to reduce the number of individual clamp locations requiring analysis are described

  3. Mechanical and metallurgical properties of carotid artery clamps.

    Science.gov (United States)

    Dujovny, M; Kossovsky, N; Kossowsky, R; Segal, R; Diaz, F G; Kaufman, H; Perlin, A; Cook, E E

    1985-11-01

    The mechanical and metallurgical properties of carotid artery clamps were evaluated. The pressure plate retreat propensity, metallurgical composition, surface morphology, magnetic properties, and corrosion resistance of the Crutchfield, Selverstone, Salibi, and Kindt clamps were tested. None of the clamps showed evidence of pressure plate retreat. The clamps differed significantly in their composition, surface cleanliness, magnetic properties, and corrosion resistance. The Crutchfield clamp was the only one manufactured from an ASTM-ANSI-approved implantable stainless steel (AISI 316) and the only clamp in which the surfaces were clean and free of debris. The Selverstone clamp was made principally from AISI 304 stainless steel, as was one Salibi clamp. The pressure plate on another Salibi clamp was made from a 1% chromium and 1% manganese steel. Machining and surface debris consisting principally of aluminum, silicon, and sulfur was abundant on the Selverstone and Salibi clamps. The Kindt clamp was manufactured from AISI 301 stainless steel with a silicate-aluminized outer coating. The Crutchfield and Selverstone clamps were essentially nonferromagnetic, whereas the Salibi and Kindt clamps were sensitive to magnetic flux. In the pitting potential corrosion test, the Crutchfield clamp demonstrated good corrosion resistance with a pitting potential of 310 mV and no surface corrosion or pitting by scanning electron microscopy examination. The Selverstone clamp had lower pitting potentials and showed various degrees of corrosion and surface pitting by scanning electron microscopy. The Salibi pressure plate had a very low pitting potential of -525 mV and showed severe corrosion. By metallurgical criteria, only the Crutchfield clamp is suitable for long term implantation.

  4. Cognitive MRI-TRUS fusion-targeted prostate biopsy according to PI-RADS classification in patients with prior negative systematic biopsy results

    Directory of Open Access Journals (Sweden)

    Wei-Jen Lai

    2016-11-01

    Conclusion: Cognitive MRI-TRUS fusion-targeted biopsy without concurrent systematic biopsy can detect significant prostate cancer in patients with previous negative systematic biopsy results and persistently elevated PSA levels. Noncancer-yield patients should undergo active surveillance and further follow-ups.

  5. Analysis of the Pallet Clamping Conditions in Work Positioning

    Directory of Open Access Journals (Sweden)

    L. A. Kolesnikov

    2016-01-01

    Full Text Available Pallets of automatic transfer lines serve as the technological and work-transfer equipment. However, their design is based on the general principles of designing machine accessories. Calculation of the basic design parameters of work based on their functioning features is fairly relevant.In pallet transfer movement over work positioning there is a mismatch between axes of the basic bushing of a pallet and the clamping locks of positioning. The paper identifies the factors influencing it, and defines the conditions to ensure the trouble-free clamping lock. The circular and rhombic clamping of pallet is simultaneous. Further, a clamping load is calculated from the pallet mass (together with the work-piece and the geometric parameters of the pallet clamping.The paper reveals three movement stages of the clamping lock in a vertical plane when setting the pallet in work positioning:- a clamping lock free play till it encounters with the location bushing;- a clamping lock play length when the lead-in chamfer contacts the bushing chamfer;- a clamping lock play length over the circular surface of bushing.The study of this process has allowed us to calculate the time of pallet clamping and dynamic loads acting on the clamping lock. These calculations made it possible to calculate the required diameter of the clamping lock. The presented calculations allow a reasonable assigning the main design parameters of work positioning for the pallet automatic lines.

  6. Single molecule study of a processivity clamp sliding on DNA

    Energy Technology Data Exchange (ETDEWEB)

    Laurence, T A; Kwon, Y; Johnson, A; Hollars, C; O?Donnell, M; Camarero, J A; Barsky, D

    2007-07-05

    Using solution based single molecule spectroscopy, we study the motion of the polIII {beta}-subunit DNA sliding clamp ('{beta}-clamp') on DNA. Present in all cellular (and some viral) forms of life, DNA sliding clamps attach to polymerases and allow rapid, processive replication of DNA. In the absence of other proteins, the DNA sliding clamps are thought to 'freely slide' along the DNA; however, the abundance of positively charged residues along the inner surface may create favorable electrostatic contact with the highly negatively charged DNA. We have performed single-molecule measurements on a fluorescently labeled {beta}-clamp loaded onto freely diffusing plasmids annealed with fluorescently labeled primers of up to 90 bases. We find that the diffusion constant for 1D diffusion of the {beta}-clamp on DNA satisfies D {le} 10{sup -14} cm{sup 2}/s, much slower than the frictionless limit of D = 10{sup -10} cm{sup 2}/s. We find that the {beta} clamp remains at the 3-foot end in the presence of E. coli single-stranded binding protein (SSB), which would allow for a sliding clamp to wait for binding of the DNA polymerase. Replacement of SSB with Human RP-A eliminates this interaction; free movement of sliding clamp and poor binding of clamp loader to the junction allows sliding clamp to accumulate on DNA. This result implies that the clamp not only acts as a tether, but also a placeholder.

  7. 21 CFR 876.5160 - Urological clamp for males.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Urological clamp for males. 876.5160 Section 876...) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5160 Urological clamp for males. (a) Identification. A urological clamp for males is a device used to close the urethra of a male to...

  8. 21 CFR 882.5175 - Carotid artery clamp.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Carotid artery clamp. 882.5175 Section 882.5175...) MEDICAL DEVICES NEUROLOGICAL DEVICES Neurological Therapeutic Devices § 882.5175 Carotid artery clamp. (a) Identification. A carotid artery clamp is a device that is surgically placed around a patient's carotid artery...

  9. CT fluoroscopy-guided vs. multislice CT biopsy mode-guided lung biopsies: Accuracy, complications and radiation dose

    International Nuclear Information System (INIS)

    Prosch, Helmut; Stadler, Alfred; Schilling, Matthias; Bürklin, Sandra; Eisenhuber, Edith; Schober, Ewald; Mostbeck, Gerhard

    2012-01-01

    Background: The aim of this retrospective study was to compare the diagnostic accuracy, the frequency of complications, the duration of the interventions and the radiation doses of CT fluoroscopy (CTF) guided biopsies of lung lesions with those of multislice CT (MS-CT) biopsy mode-guided biopsies. Methods: Data and images from 124 consecutive patients undergoing CTF-guided lung biopsy (group A) and 132 MS-CT-biopsy mode-guided lung biopsy (group B) were reviewed. CTF-guided biopsies were performed on a Siemens Emotion 6 CT scanner with intermittent or continuous CT-fluoroscopy, MS-CT biopsy mode-guided biopsies were performed on a Siemens Emotion 16 CT scanner. All biopsies were performed with a coaxial needle technique. Results: The two groups (A vs. B) did not differ significantly regarding sensitivity (95.5% vs. 95.9%), specificity (96.7% vs. 95.5%), negative predictive value (87.9% vs. 84%) or positive predictive value (98.8% vs. 98.9%). Pneumothorax was observed in 30.0% and 32.5% of the patients, respectively. Chest tube placement was necessary in 4% (group A) and 13% (group B) of the patients. The duration of the intervention was significantly longer in group A (median 37 min vs. 32 min, p = 0.04). The mean CT dose index (CTDI) was 422 in group A and 36.3 in group B (p < 0.001). Conclusion: Compared to CTF-guided biopsies, chest biopsies using the MS-CT biopsy mode show dramatically lower CTDI levels. Although the diagnostic yield of the procedures do not differ significantly, biopsies using the MS-CT-biopsy mode have a three-fold higher rate of chest tube placement.

  10. Combined Triplex/Duplex Invasion of Double-Stranded DNA by "Tail-Clamp" Peptide Nucleic Acid

    DEFF Research Database (Denmark)

    Bentin, Thomas; Larsen, H. J.; Nielsen, Peter E.

    2003-01-01

    "Tail-clamp" PNAs composed of a short (hexamer) homopyrimidine triplex forming domain and a (decamer) mixed sequence duplex forming extension have been designed. Tail-clamp PNAs display significantly increased binding to single-stranded DNA compared with PNAs lacking a duplex-forming extension...... as determined by T-m measurements. Binding to double-stranded (ds) DNA occurred by combined triplex and duplex invasion as analyzed by permanganate probing. Furthermore, C-50 measurements revealed that tail-clamp PNAs consistently bound the dsDNA target more efficiently, and kinetics experiments revealed...... to five residues was feasible, but four bases were not sufficient to yield detectable dsDNA binding. The results validate the tail-clamp PNA concept and expand the applications of the P-loop technology....

  11. CT-guided adrenal biopsy: comparison of ipsilateral decubitus versus prone patient positioning for biopsy approach

    International Nuclear Information System (INIS)

    Odisio, Bruno C.; Tam, Alda L.; Avritscher, Rony; Gupta, Sanjay; Wallace, Michael J.

    2012-01-01

    To compare ipsilateral decubitus and prone patient positioning for performing computed tomography guided adrenal biopsy using the requirements for out-of-plane approach (OOP) and the needle insertion time (NIT) as a surrogate for procedure complexity. The study included 106 adrenal biopsies performed in 104 patients with lesions measuring ≤4 cm that were divided into two groups: Ipsilateral decubitus (Group I) and prone (Group II) positions. The frequency of use of an OOP biopsy path and the NIT were recorded as well as diagnostic yield, adverse events and transgression of organs to approach the target lesion. Groups I and II comprised 54 and 50 patients, respectively. The use of the OOP approach was significantly less frequent (P < 0.01) in Group I (n = 4) compared to Group II (n = 38). NIT was statistically shorter (P < 0.01) in Group I (9 min and 43 s) compared to Group II (19 min and 7 s). There were fewer organs traversed in Group I versus Group II. Diagnostic yield and post-biopsy complications were equal in both groups. Ipsilateral adrenal biopsy approach is a less complex, equally reliable and safe compared to the prone approach based on the less frequent use of the OOP approach and the shorter NIT. circle Ipsilateral adrenal biopsy decubitus positioning provides a direct, non-transpulmonary path for sampling circle Ipsilateral decubitus positioning reduces the need for potentially dangerous out-of-plane approaches (OOP) circle Ipsilateral decubitus and prone positioning are equally reliable and safe techniques. (orig.)

  12. High-speed dynamic-clamp interface

    Science.gov (United States)

    Yang, Yang; Adowski, Timothy; Ramamurthy, Bina; Neef, Andreas

    2015-01-01

    The dynamic-clamp technique is highly useful for mimicking synaptic or voltage-gated conductances. However, its use remains rare in part because there are few systems, and they can be expensive and difficult for less-experienced programmers to implement. Furthermore, some conductances (such as sodium channels) can be quite rapid or may have complex voltage sensitivity, so high speeds are necessary. To address these issues, we have developed a new interface that uses a common personal computer platform with National Instruments data acquisition and WaveMetrics IGOR to provide a simple user interface. This dynamic clamp implements leak and linear synaptic conductances as well as a voltage-dependent synaptic conductance and kinetic channel conductances based on Hodgkin-Huxley or Markov models. The speed of the system can be assayed using a testing mode, and currently speeds of >100 kHz (10 μs per cycle) are achievable with short latency and little jitter. PMID:25632075

  13. Transjugular liver biopsy : the efficacy of quick-core biopsy needle system

    Energy Technology Data Exchange (ETDEWEB)

    Jung, Gyoo Sik; Ahn, Byung Kwon; Lee, Sang Ouk; Chang, Hee Kyong; Oh, Kyung Seung; Huh, Jin Do; Joh, Young Duk [Kosin Medical College, Pusan (Korea, Republic of)

    1998-02-01

    To evaluate the efficacy of the Quick-Core biopsy needle system in performing transjugular liver biopsy. Between December 1995 and June 1997, eight patients underwent transjugular liver biopsy involving use of the Quick-Core biopsy needle system; the conditions involved were coagulopathy (n=4), thrombocytopenia (n=3), and ascites (n=1). Via the right internal jugular vein, the right hepatic vein was selectively catheterized with a 7-F transjugular guiding catheter, and a14-guage stiffening cannula was then inserted through this catheter; to obtain core tissue, a Quick-Core needle was then advanced into the liver parenchyma through the catheter-cannula combination. Eighteen- and 19-guage needles were used in three and five patients, respectively; specimen size, adequacy of the biopsy specimen and histologic diagnosis were determined, and complications were recorded. Biopsy was successful in all patients. The mean length of the specimen was 1.4 cm (1.0 - 1.8 cm), and all were adequate for pathologic examinations ; specific diagnosis was determined in all patients. There were two malignant neoplasms, two cases of veno-occlusive disease, and one case each of cirrhosis, fulminant hepatitis, Banti syndrome and Budd-Chiari syndrome. One patient complained of neck pain after the procedure, but no serious procedural complications were noted. Our preliminary study shows that the Quick-Core biopsy needle system is safe and provides adequate core tissues with high diagnostic yields. (author). 23 refs., 1 tab., 3 figs.

  14. Transjugular liver biopsy : the efficacy of quick-core biopsy needle system

    International Nuclear Information System (INIS)

    Jung, Gyoo Sik; Ahn, Byung Kwon; Lee, Sang Ouk; Chang, Hee Kyong; Oh, Kyung Seung; Huh, Jin Do; Joh, Young Duk

    1998-01-01

    To evaluate the efficacy of the Quick-Core biopsy needle system in performing transjugular liver biopsy. Between December 1995 and June 1997, eight patients underwent transjugular liver biopsy involving use of the Quick-Core biopsy needle system; the conditions involved were coagulopathy (n=4), thrombocytopenia (n=3), and ascites (n=1). Via the right internal jugular vein, the right hepatic vein was selectively catheterized with a 7-F transjugular guiding catheter, and a14-guage stiffening cannula was then inserted through this catheter; to obtain core tissue, a Quick-Core needle was then advanced into the liver parenchyma through the catheter-cannula combination. Eighteen- and 19-guage needles were used in three and five patients, respectively; specimen size, adequacy of the biopsy specimen and histologic diagnosis were determined, and complications were recorded. Biopsy was successful in all patients. The mean length of the specimen was 1.4 cm (1.0 - 1.8 cm), and all were adequate for pathologic examinations ; specific diagnosis was determined in all patients. There were two malignant neoplasms, two cases of veno-occlusive disease, and one case each of cirrhosis, fulminant hepatitis, Banti syndrome and Budd-Chiari syndrome. One patient complained of neck pain after the procedure, but no serious procedural complications were noted. Our preliminary study shows that the Quick-Core biopsy needle system is safe and provides adequate core tissues with high diagnostic yields. (author). 23 refs., 1 tab., 3 figs

  15. Quadratic sinusoidal analysis of voltage clamped neurons.

    Science.gov (United States)

    Magnani, Christophe; Moore, Lee E

    2011-11-01

    Nonlinear biophysical properties of individual neurons are known to play a major role in the nervous system, especially those active at subthreshold membrane potentials that integrate synaptic inputs during action potential initiation. Previous electrophysiological studies have made use of a piecewise linear characterization of voltage clamped neurons, which consists of a sequence of linear admittances computed at different voltage levels. In this paper, a fundamentally new theory is developed in two stages. First, analytical equations are derived for a multi-sinusoidal voltage clamp of a Hodgkin-Huxley type model to reveal the quadratic response at the ionic channel level. Second, the resulting behavior is generalized to a novel Hermitian neural operator, which uses an algebraic formulation capturing the entire quadratic behavior of a voltage clamped neuron. In addition, this operator can also be used for a nonlinear identification analysis directly applicable to experimental measurements. In this case, a Hermitian matrix of interactions is built with paired frequency probing measurements performed at specific harmonic and interactive output frequencies. More importantly, eigenanalysis of the neural operator provides a concise signature of the voltage dependent conductances determined by their particular distribution on the dendritic and somatic membrane regions of neurons. Finally, the theory is concretely illustrated by an analysis of an experimentally measured vestibular neuron, providing a remarkably compact description of the quadratic responses involved in the nonlinear processing underlying the control of eye position during head rotation, namely the neural integrator.

  16. A Dynamic Clamp on Every Rig.

    Science.gov (United States)

    Desai, Niraj S; Gray, Richard; Johnston, Daniel

    2017-01-01

    The dynamic clamp should be a standard part of every cellular electrophysiologist's toolbox. That it is not, even 25 years after its introduction, comes down to three issues: money, the disruption that adding dynamic clamp to an existing electrophysiology rig entails, and the technical prowess required of experimenters. These have been valid and limiting issues in the past, but no longer. Technological advances associated with the so-called maker movement render them moot. We demonstrate this by implementing a fast (∼100 kHz) dynamic clamp system using an inexpensive microcontroller (Teensy 3.6). The overall cost of the system is less than USD$100, and assembling it requires no prior electronics experience. Modifying it-for example, to add Hodgkin-Huxley-style conductances-requires no prior programming experience. The system works together with existing electrophysiology data acquisition systems (for Macintosh, Windows, and Linux); it does not attempt to supplant them. Moreover, the process of assembling, modifying, and using the system constitutes a useful pedagogical exercise for students and researchers with no background but an interest in electronics and programming. We demonstrate the system's utility by implementing conductances as fast as a transient sodium conductance and as complex as the Ornstein-Uhlenbeck conductances of the "point conductance" model of synaptic background activity.

  17. No need for biopsies

    DEFF Research Database (Denmark)

    Gjødsbøl, Kristine; Skindersoe, Mette E; Christensen, Jens Jørgen

    2011-01-01

    The aim of the study was to compare three sampling techniques used in routine diagnostics to identify the microbiota in chronic venous leg ulcers. A total of 46 patients with persisting venous leg ulcers were included in the study. At inclusion, swab, biopsy and filter paper pad samples were...... collected. After 4 weeks, additional biopsy and filter paper pad samples were collected. Bacteria were isolated and identified at species level by standard methods. The most common bacterial species detected was Staphylococcus aureus found in 89% of the ulcers. No methicillin-resistant S. aureus isolates...

  18. The plastic instability of clamped-clamped conical thin-walled pipe reducers

    International Nuclear Information System (INIS)

    Awad, Ibrahim; Saleh, Ch.A.R.; Ragab, A.R.

    2016-01-01

    The analytical study for plastic deformation of clamped–clamped conical reducer pipe under internal pressure does not deduce a closed form expression for the pressure at plastic instability. The presented study employs finite element analysis (FEA) to estimate the internal pressure at instability for conical reducers made of different materials and having different dimensional configurations. Forty dimensional configurations, classified as medium type, and five types of materials have been included in the analysis using ABAQUS package. A correlation expression is derived by nonlinear regression to predict the instability pressure. The proposed expression is verified for other dimensional configurations out of the above used forty models and for other materials. Experiments have been conducted by pressurizing conical clamped-clamped reducers until bursting in order to verify the finite element models. Comparison of instability pressures, strains and deflections at specific points along the conical surface shows satisfactory agreement between analysis and experiments. - Highlights: • This study offers a parametric study of the plastic instability pressure of clamped-clamped conical reducers. • A closed form analytical expression for the instability pressure is derived by using nonlinear regression. • The finite element analysis is validated by conducting bursting tests.

  19. Dental dam clamp adaptation method on carved gypsum cast.

    Science.gov (United States)

    Cazacu, N C E

    2014-01-01

    Dental Dam is the safest and most efficient isolation technique in endodontics and restorative dentistry, but it also used in esthetics, orthodontics, prosthetics, pedodontics and periodontology (for teeth immobilization). While in most cases the standard clamps are efficient, in some clinical situations clamp adaptation is mandatory in order to assure a tight contact on the tooth. The purpose of this study is to list the elements of the clamp, which should be modified in order to assure a secure constriction of the clamp on the anchor tooth, by using the carved gypsum cast method. 100 patients were examined, diagnosed and treated for various diagnoses like simple decay, gangrene, chronic apical periodontitis, and endodontic retreatments. The clamps used in this study were produced by Hu-Friedy, Hygenic, KKD, SDI, Hager & Werken. In 10 cases, the anchor tooth did not provide enough stability to the standard clamp--as provided by the producer. Therefore, we have done some adjustments to some of the elements of the clamp: the arch, the wings, the plateau, the active area, and the contact points. In 6 cases, major clamp adaptations on carved gypsum cast were imperative. The classic clamps cannot provide a grip to be enough in all the clinical cases due to the huge variety and position and implantation of the anchor teeth. Therefore, in such situations, the clamps should be adapted in order to provide stability and assure the safe isolation during the treatment. The modified clamps will be useful in similar cases, so they must be kept.

  20. Analysis and testing of the DIII-D ohmic heating coil lead repair clamp

    International Nuclear Information System (INIS)

    Reis, E.E.; Anderson, P.M.; Chin, E.; Robinson, J.I.

    1997-11-01

    DIII-D has been operating for the last year with limited volt-second capabilities due to structural failure of a conductor lead to one of the ohmic heating (OH) solenoids. The conductor failure was due to poor epoxy impregnation of the overwrap of the lead pack, resulting in copper fatigue and a water leak. A number of structural analyses were performed to assist in determining the failure scenario and to evaluate various repair options. A fatigue stress analysis of the leads with a failed epoxy overwrap indicated crack initiation after 1,000 cycles at the maximum operating conditions. The failure occurred in a very inaccessible area which restricted design repair options to concepts which could be implemented remotely. Several design options were considered for repairing the lead so that it can sustain the loads for 7.5 Vs conditions at full toroidal field. A clamp, along with preloaded banding straps and shim bags, provides a system that guarantees that the stress at the crack location is always compressive and prevents further crack growth in the conductor. Due to the limited space available for the repair, it was necessary to design the clamp system to operate at the material yield stress. The primary components of the clamp system were verified by load tests prior to installation. The main body of the clamp contains a load cell and potentiometer for monitoring the load-deflection characteristics of the clamp and conductors during plasma operation. Strain gages provides redundant instrumentation. If required, the preload on the conductors can be increased remotely by a special wrench attached to the clamp assembly

  1. Breast biopsy - stereotactic

    Science.gov (United States)

    The provider will ask about your medical history. A breast exam may be done. If you take medicines (including aspirin, supplements, or herbs), ask your doctor whether you need to stop taking these before the biopsy. Tell your doctor if you may be ...

  2. Closed Pericardial Biopsy

    African Journals Online (AJOL)

    1974-09-28

    Sep 28, 1974 ... The instrument used is a hook biopsy needle (Fig. I). manufactured by Becton, Dickinson and Co., Rutherford,. New Jersey, USA. The instrument' and technique' will be reviewed. The instrument consists of an ll-gauge needle with a sharp cutting edge into which fits, interchangeably, a 13-gauge needle or a ...

  3. Lung needle biopsy

    Science.gov (United States)

    ... if you have certain lung diseases such as emphysema. Usually, a collapsed lung after a biopsy does not need treatment. But ... any type Bullae (enlarged alveoli that occur with emphysema) Cor pulmonale (condition ... of the lung High blood pressure in the lung arteries Severe ...

  4. No need for biopsies

    DEFF Research Database (Denmark)

    Gjødsbøl, Kristine; Skindersoe, Mette E; Christensen, Jens Jørgen

    2011-01-01

    The aim of the study was to compare three sampling techniques used in routine diagnostics to identify the microbiota in chronic venous leg ulcers. A total of 46 patients with persisting venous leg ulcers were included in the study. At inclusion, swab, biopsy and filter paper pad samples were coll...

  5. Open pleural biopsy

    Science.gov (United States)

    An open pleural biopsy is done in the hospital using general anesthesia . This means you will be asleep and pain-free. A tube will be placed through your mouth down your throat to help you breathe. The surgery is done in ...

  6. Unequal pressure distribution along the jaws of currently available vascular clamps: do we need a new aortic clamp?

    Science.gov (United States)

    Rylski, Bartosz; Schmid, Claudius; Beyersdorf, Friedhelm; Kari, Fabian Alexander; Kondov, Stoyan; Lutz, Lisa; Werner, Martin; Czerny, Martin; Siepe, Matthias

    2016-06-01

    The pressure along vascular clamp jaws may be unequally distributed, with greater pressure near the clamp hinge than at its top. Such unequal pressure distribution may cause aortic injury, especially in large aortas. We evaluated pressure distribution along different currently availably clamp jaws. Seven descending thoracic aortas from pigs (diameter 2.0-3.0 cm) were plainly dissected and all side arteries closed. Aortas were filled up with water and cross-clamped. The pressure inside the aorta was raised to 100 mmHg and the aorta was clamped so tightly that no water exited from the distal aortic end. Each aorta was clamped seven times at different sites with the following clamps: DeBakey, Satinsky, femoral, iliac, Chitwood, angled handle Fogarty and straight handle Fogarty. The pressure along the clamp jaws was measured with a pressure-detecting film placed between the clamp jaws and aorta. The collagen-fibre disorganization was examined in haemotoxylin-eosin- and Elastica van Gieson-stained tissue samples. The DeBakey clamp revealed the lowest maximum pressure along the clamp jaws after complete aortic occlusion (1.43 ± 0.49 MPa), whereas the Chitwood clamp's pressure was the highest (3.26 ± 1.93 MPa, P clamp displayed the lowest difference between maximum pressures across the jaws (33%), with the greatest difference measured in the iliac (72%) and Chitwood (66%) clamps. The highest collagen-fibre disorganization score was observed in the proximal-to-the-clamp-hinge quartile after clamping with the angled handle Fogarty (2.8 ± 0.4), straight handle Fogarty (2.3 ± 0.8) and Chitwood (2.3 ± 0.5) clamps. The pressure along clamp jaws is unequally distributed in all the currently available vascular clamps. The Chitwood clamp is associated with the highest maximum pressure during complete aortic occlusion and with the most unequal pressure distribution along the jaws. © The Author 2015. Published by Oxford University Press on behalf of the European Association

  7. Microwave electromechanical resonator consisting of clamped carbon nanotubes in an abacus arrangement

    Science.gov (United States)

    Peng, H. B.; Chang, C. W.; Aloni, S.; Yuzvinsky, T. D.; Zettl, A.

    2007-07-01

    We describe nanoscale electromechanical resonators capable of operating in ambient-pressure air at room temperature with unprecedented fundamental resonance frequency of ˜4GHz . The devices are created from suspended carbon nanotubes loaded abacus style with inertial metal clamps, yielding short effective beam lengths. We examine the energy dissipation in the system due to air damping and contact loss. Such nanoabacus resonators open windows for immediate practical microwave frequency nanoelectromechanical system applications.

  8. Improving safety and efficiency during emergent central venous catheter placement with a needleless securing clamp.

    Science.gov (United States)

    Silich, Bert; Chrobak, Paul; Siu, Jeffrey; Schlichting, Adam; Patel, Samir; Yang, James

    2013-08-01

    To compare the needleless securing clamp to the traditional suture-secured clamp for central venous catheters. Compare the holding strength of each type of clamps by measuring the amount of kinetic energy absorbed, ask 20 physicians to evaluate the clamp placement using sutures or staples, and summarise the clamps effectiveness and complications in 10 patients. Compared to sutured clamp, the needleless clamp was more secure. The needleless clamp was also significantly better with regard to ease of use, safety, perceived strength (p value clamps. Without incurring complications or increasing risk to patients, the needleless clamp is secure and improves safety and efficiency for physicians.

  9. The β Sliding Clamp Closes around DNA prior to Release by the Escherichia coli Clamp Loader γ Complex*

    Science.gov (United States)

    Hayner, Jaclyn N.; Bloom, Linda B.

    2013-01-01

    Escherichia coli γ complex clamp loader functions to load the β sliding clamp onto sites of DNA replication and repair. The clamp loader uses the energy of ATP binding and hydrolysis to drive conformational changes allowing for β binding and opening, DNA binding, and then release of the β·DNA complex. Although much work has been done studying the sliding clamp and clamp loader mechanism, kinetic analysis of the events following β·γ complex·DNA formation is not complete. Using fluorescent clamp closing and release assays, we show that β closing is faster than β release, indicating that γ complex closes β before releasing it around DNA. Using a fluorescent ATP hydrolysis assay, we show that there is a burst of ATP hydrolysis before β closing and that β release may be the rate-limiting step in the overall clamp loading reaction. The combined use of these fluorescent assays provides a unique perspective into the E. coli clamp loader by providing a measure of the relative timing of different events in the clamp loading reaction, helping to elucidate the complicated clamp loading mechanism. PMID:23161545

  10. The ATP Sites of AAA+ Clamp Loaders Work Together as a Switch to Assemble Clamps on DNA*

    Science.gov (United States)

    Marzahn, Melissa R.; Hayner, Jaclyn N.; Finkelstein, Jeff; O'Donnell, Mike; Bloom, Linda B.

    2014-01-01

    Clamp loaders belong to a family of proteins known as ATPases associated with various cellular activities (AAA+). These proteins utilize the energy from ATP binding and hydrolysis to perform cellular functions. The clamp loader is required to load the clamp onto DNA for use by DNA polymerases to increase processivity. ATP binding and hydrolysis are coordinated by several key residues, including a conserved Lys located within the Walker A motif (or P-loop). This residue is required for each subunit to bind ATP. The specific function of each ATP molecule bound to the Saccharomyces cerevisiae clamp loader is unknown. A series of point mutants, each lacking a single Walker A Lys residue, was generated to study the effects of abolishing ATP binding in individual clamp loader subunits. A variety of biochemical assays were used to analyze the function of ATP binding during discrete steps of the clamp loading reaction. All mutants reduced clamp binding/opening to different degrees. Decreased clamp binding activity was generally correlated with decreases in the population of open clamps, suggesting that differences in the binding affinities of Walker A mutants stem from differences in stabilization of proliferating cell nuclear antigen in an open conformation. Walker A mutations had a smaller effect on DNA binding than clamp binding/opening. Our data do not support a model in which each ATP site functions independently to regulate a different step in the clamp loading cycle to coordinate these steps. Instead, the ATP sites work in unison to promote conformational changes in the clamp loader that drive clamp loading. PMID:24436332

  11. The ATP sites of AAA+ clamp loaders work together as a switch to assemble clamps on DNA.

    Science.gov (United States)

    Marzahn, Melissa R; Hayner, Jaclyn N; Finkelstein, Jeff; O'Donnell, Mike; Bloom, Linda B

    2014-02-28

    Clamp loaders belong to a family of proteins known as ATPases associated with various cellular activities (AAA+). These proteins utilize the energy from ATP binding and hydrolysis to perform cellular functions. The clamp loader is required to load the clamp onto DNA for use by DNA polymerases to increase processivity. ATP binding and hydrolysis are coordinated by several key residues, including a conserved Lys located within the Walker A motif (or P-loop). This residue is required for each subunit to bind ATP. The specific function of each ATP molecule bound to the Saccharomyces cerevisiae clamp loader is unknown. A series of point mutants, each lacking a single Walker A Lys residue, was generated to study the effects of abolishing ATP binding in individual clamp loader subunits. A variety of biochemical assays were used to analyze the function of ATP binding during discrete steps of the clamp loading reaction. All mutants reduced clamp binding/opening to different degrees. Decreased clamp binding activity was generally correlated with decreases in the population of open clamps, suggesting that differences in the binding affinities of Walker A mutants stem from differences in stabilization of proliferating cell nuclear antigen in an open conformation. Walker A mutations had a smaller effect on DNA binding than clamp binding/opening. Our data do not support a model in which each ATP site functions independently to regulate a different step in the clamp loading cycle to coordinate these steps. Instead, the ATP sites work in unison to promote conformational changes in the clamp loader that drive clamp loading.

  12. In vivo fracture of a new rubber-dam clamp.

    Science.gov (United States)

    Zinelis, S; Margelos, J

    2002-08-01

    This study was carried out to investigate the reasons for fracture of a new rubber-dam clamp used for the first time. The fractured surfaces of the broken clamp were studied with optical microscopy. Characteristic surface patterns of tensile fracture were identified. Cracks originated from the groove of letter D mechanically engraved on the inner surface of the clamp bow, and developed with high velocity (unstable crack growth rate) leading to catastrophic fracture. This behaviour was attributed to the residual stresses introduced by the labelling technique due to local thermal alterations. The labelling technique used to number clamps may be implicated with catastrophic failure. Dentists should be aware that even new clamps can fracture. It is important that clamps are secured to prevent inhalation of metal fragments, should catastrophic failure occur.

  13. Design of a hot clamp for small diameter LMFBR piping

    International Nuclear Information System (INIS)

    Jones, J.W.; Hamel, D.

    1980-01-01

    In order to evaluate the feasibility of using a strap-type clamp on breeder reactor small diameter piping, a series of analyses were conducted to determine the thermal and mechanical stresses induced in the pipe by the clamp. The effect of using a thin layer of insulation of varying thickness between the pipe and clamp was also investigated. A thermal analysis of the pipe and clamp was conducted for each thermal transient rate. Various insulation values ranging from metal-to-metal condition to perfect insulation between the pipe and clamp were analyzed to determine the effect of insulating the pipe from the clamp. An axisymmetric finite element model was used to determine the axial thermal and stress patterns

  14. Type IA topoisomerase inhibition by clamp closure.

    Science.gov (United States)

    Leelaram, Majety Naga; Bhat, Anuradha Gopal; Godbole, Adwait Anand; Bhat, Rajeshwari Subray; Manjunath, Ramanathapuram; Nagaraja, Valakunja

    2013-08-01

    Bacterial DNA topoisomerase I (topoI) catalyzes relaxation of negatively supercoiled DNA. The enzyme alters DNA topology through protein-operated DNA gate, switching between open and closed conformations during its reaction. We describe the mechanism of inhibition of Mycobacterium smegmatis and Mycobacterium tuberculosis topoI by monoclonal antibodies (mAbs) that bind with high affinity and inhibit at 10-50 nM concentration. Unlike other inhibitors of topoisomerases, the mAbs inhibited several steps of relaxation reaction, namely DNA binding, cleavage, strand passage, and enzyme-DNA dissociation. The enhanced religation of the cleaved DNA in presence of the mAb indicated closing of the enzyme DNA gate. The formation of enzyme-DNA heterocatenane in the presence of the mAbs as a result of closing the gate could be inferred by the salt resistance of the complex, visualized by atomic force microscopy and confirmed by fluorescence measurements. Locking the enzyme-DNA complex as a closed clamp restricted the movements of the DNA gate, affecting all of the major steps of the relaxation reaction. Enzyme trapped on DNA in closed clamp conformation formed roadblock for the elongating DNA polymerase. The unusual multistep inhibition of mycobacterial topoisomerases may facilitate lead molecule development, and the mAbs would also serve as valuable tools to probe the enzyme mechanism.

  15. Oral Biopsy: A Dental Gawk

    African Journals Online (AJOL)

    Oral Biopsy: A Dental Gawk. Sir,. Dermatologists are often confronted with neoplasms ... the use of a needle, biopsy punch, biopsy forceps, laser, or electrocautery device. Needles may be appropriate in ... so widespread in dental practice––fundamentally because of a lack of awareness of the procedure among dental.

  16. Medial Clamp Tine Positioning Affects Ankle Syndesmosis Malreduction.

    Science.gov (United States)

    Cosgrove, Christopher T; Putnam, Sara M; Cherney, Steven M; Ricci, William M; Spraggs-Hughes, Amanda; McAndrew, Christopher M; Gardner, Michael J

    2017-08-01

    To determine whether the position of the medial clamp tine during syndesmotic reduction affected reduction accuracy. Prospective cohort. Urban Level 1 trauma center. Seventy-two patients with operatively treated syndesmotic injuries. Patients underwent operative fixation of their ankle syndesmotic injuries using reduction forceps. The position of the medial clamp tine was then recorded with intraoperative fluoroscopy. Malreduction rates were then assessed with bilateral ankle computerized tomography. Fibular position within the incisura was measured with respect to the uninjured side to determine whether a malreduction had occurred. Malreductions were then analyzed for associations with injury pattern, patient demographics, and the location of the medial clamp tine. A statistically significant association was found between medial clamp position and sagittal plane syndesmosis malreduction. In reference to anterior fibular translation, there was a 0% malreduction rate in the 18 patients where the clamp tine was placed in the anterior third, a 19.4% malreduction rate in the middle third, and 60% malreduction rate in the posterior third (P = 0.006). In reference to posterior fibular translation, there was a 11.1% malreduction when clamp placement was in the anterior third, a 16.1% malreduction rate in the middle third, and 60% malreduction rate in the posterior third (P = 0.062). There were no significant associations between medial clamp position and coronal plane malreductions (overcompression or undercompression) (P = 1). When using reduction forceps for syndesmotic reduction, the position of the medial clamp tine can be highly variable. The angle created with off-axis syndesmotic clamping is likely a major culprit in iatrogenic malreduction. Sagittal plane malreduction appears to be highly sensitive to clamp obliquity, which is directly related to the medial clamp tine placement. Based on these data, we recommend placing the medial clamp tine in the anterior third

  17. Obstetricians' attitudes and beliefs regarding umbilical cord clamping.

    Science.gov (United States)

    Jelin, Angie C; Kuppermann, Miriam; Erickson, Kristine; Clyman, Ronald; Schulkin, Jay

    2014-09-01

    Although delayed umbilical cord clamping has been demonstrated to reduce the incidence of intraventricular hemorrhage and neonatal sepsis, and decrease the need for neonatal transfusions (without affecting cord pH, Apgar scores or the need for phototherapy), the extent to which this practice is being employed is unknown. We conducted a survey of US obstetricians to assess their attitudes and beliefs about cord clamping. Questionnaires were randomly mailed to members of the American College of Obstetricians and Gynecologists (ACOG), and the Collaborative Ambulatory Research Network (CARN). The data were analyzed using Chi-square and Student t tests. The response rates for the CARN and other ACOG members were 47% and 21%, respectively. Most (88%) responders reported their hospital had no umbilical cord clamping policy. The most frequent response for optimal timing of umbilical cord clamping, regardless of gestational age, was "don't know". Potential for neonatal red blood cell transfusion was the only concern cited as a reason for being somewhat or very inclined to delay umbilical cord clamping (51%). Delayed neonatal resuscitation (76%) was listed as a reason to clamp the cord immediately, despite the paucity of literature to support immediate cord clamping in this cohort. Despite substantial evidence supporting the practice of delayed cord clamping, few institutions have policies regarding this practice. Moreover, obstetricians' beliefs about the appropriate timing for umbilical cord clamping are not consistent with the evidence that demonstrates its beneficial impact on neonatal outcomes.

  18. Usefulness of automated biopsy guns in image-guided biopsy

    International Nuclear Information System (INIS)

    Lee, Jung Hyung; Rhee, Chang Soo; Lee, Sung Moon; Kim, Hong; Woo, Sung Ku; Suh, Soo Jhi

    1994-01-01

    To evaluate the usefulness of automated biopsy guns in image-guided biopsy of lung, liver, pancreas and other organs. Using automated biopsy devices, 160 biopsies of variable anatomic sites were performed: Biopsies were performed under ultrasonographic(US) guidance in 95 and computed tomographic (CT) guidance in 65. We retrospectively analyzed histologic results and complications. Specimens were adequate for histopathologic diagnosis in 143 of the 160 patients(89.4%)-Diagnostic tissue was obtained in 130 (81.3%), suggestive tissue obtained in 13(8.1%), and non-diagnostic tissue was obtained in 14(8.7%). Inadequate tissue was obtained in only 3(1.9%). There was no statistically significant difference between US-guided and CT-guided percutaneous biopsy. There was no occurrence of significant complication. We have experienced mild complications in only 5 patients-2 hematuria and 2 hematochezia in transrectal prostatic biopsy, and 1 minimal pneumothorax in CT-guided percutaneous lung biopsy. All of them were resolved spontaneously. The image-guided biopsy using the automated biopsy gun was a simple, safe and accurate method of obtaining adequate specimen for the histopathologic diagnosis

  19. Telepathology and Optical Biopsy

    Directory of Open Access Journals (Sweden)

    Olga Ferrer-Roca

    2009-01-01

    Full Text Available The ability to obtain information about the structure of tissue without taking a sample for pathology has opened the way for new diagnostic techniques. The present paper reviews all currently available techniques capable of producing an optical biopsy, with or without morphological images. Most of these techniques are carried out by physicians who are not specialized in pathology and therefore not trained to interpret the results as a pathologist would. In these cases, the use of telepathology or distant consultation techniques is essential.

  20. No need for biopsies

    DEFF Research Database (Denmark)

    Gjødsbøl, Kristine; Skindersoe, Mette E; Christensen, Jens Jørgen

    2011-01-01

    collected. After 4 weeks, additional biopsy and filter paper pad samples were collected. Bacteria were isolated and identified at species level by standard methods. The most common bacterial species detected was Staphylococcus aureus found in 89% of the ulcers. No methicillin-resistant S. aureus isolates...... were found. We did not find any significant differences regarding the bacterial species isolated between the three sampling techniques. However, using multiple techniques led to identification of more species. Our study suggests that it is sufficient to use swab specimens to identify the bacterial...

  1. Off-Clamp versus On-Clamp Robotic Partial Nephrectomy: A Multicenter Match-Paired Case-Control Study.

    Science.gov (United States)

    Peyronnet, Benoit; Khene, Zine-Eddine; Pradère, Benjamin; Seisen, Thomas; Verhoest, Grégory; Masson-Lecomte, Alexandra; Grassano, Yohann; Roumiguié, Mathieu; Beauval, Jean-Baptiste; Baumert, Hervé; Droupy, Stéphane; Doumerc, Nicolas; Bernhard, Jean-Christophe; Vaessen, Christophe; Bruyère, Franck; de la Taille, Alexandre; Rouprêt, Morgan; Bensalah, Karim

    2017-01-01

    The aim of this study was to compare the outcomes of on-clamp and off-clamp robotic partial nephrectomy (RPN). The charts of all patients who underwent an RPN at 8 institutions between 2010 and 2014 were retrospectively reviewed. The patients who underwent an off-clamp RPN were matched to on-clamp RPN in a 1-4 fashion according to the following variables: RENAL score, tumor size and surgeon's experience. Pre-, intra-, and postoperative data were compared between both groups. Among 525 RPN, 26 were performed off-clamp (5%). They were matched to 104 on-clamp RPN. The complications rate (15.5 vs. 7.7%, p = 0.53), major complications rate (4.9 vs. 3.9%; p = 0.82), and transfusions rate (0 vs. 4.9%; p = 0.58) did not differ significantly between the clamped and unclamped groups. Conversely, estimated blood loss was higher in the off-clamp group (266.4 vs. 284.6 mL, p = 0.048) and so was the rate of conversion to radical nephrectomy (0 vs. 7.7%, p = 0.04). Postoperative preservation of renal function was comparable in both groups. Off-clamp RPN is feasible for a small subgroup of renal tumors without increased risk of postoperative complications but at the cost of higher estimated blood loss and increased risk of conversion to radical nephrectomy. © 2017 S. Karger AG, Basel.

  2. Estimates of insulin sensitivity from the intravenous-glucose-modified-clamp test depend on suppression of lipolysis in type 2 diabetes: a randomised controlled trial.

    Science.gov (United States)

    Kahl, Sabine; Nowotny, Bettina; Piepel, Simon; Nowotny, Peter J; Strassburger, Klaus; Herder, Christian; Pacini, Giovanni; Roden, Michael

    2014-10-01

    The combined IVGTT-hyperinsulinaemic-euglycaemic clamp (Botnia clamp) allows the assessment of insulin secretion and sensitivity in one experiment. It remains unclear whether this clamp yields results comparable with those of the standard hyperinsulinaemic-euglycaemic clamp (SHEC) in diabetes patients. We hypothesised that the IVGTT induces responses affecting insulin sensitivity assessment. Of 22 randomised diet- or metformin-treated patients with well-controlled type 2 diabetes, 19 randomly underwent a Botnia clamp and an SHEC, spaced by 2 weeks, in one clinical research centre in a crossover study. The main outcomes were whole-body and hepatic insulin sensitivity as measured by the clamp and [6,6-(2)H2]glucose. Substrate utilisation was assessed from indirect calorimetry and beta cell function from insulin dynamics during IVGTT. The values of whole-body insulin sensitivity obtained from Botnia clamp and SHEC were correlated (r = 0.87, p clamp, but differed after IVGTT. The contribution of glucose oxidation to glucose disposal increased by 2.2 ± 0.3 and 1.2 ± 0.4 mg kg fat-free mass (FFM)(-1) min(-1) (Botnia and SHEC, p clamps correlated with individual variations of insulin sensitivity. The Botnia clamp provides similar estimates of insulin sensitivity as SHEC in patients with type 2 diabetes, but changes in NEFA during IVGTT may affect insulin sensitivity and thereby the discrimination between insulin-sensitive and insulin-resistant individuals. ClinicalTrials.gov NCT01397279 FUNDING: The study was funded by the Ministry of Science and Research of the State of North Rhine-Westphalia and the German Federal Ministry of Health, and supported in part by grants from the Federal Ministry for Research to the Centers for Diabetes Research, Helmholtz Alliance Imaging and Curing Environmental Metabolic Diseases and the Schmutzler-Stiftung.

  3. Percutaneous transbiliary biopsy.

    Science.gov (United States)

    Andrade, Gustavo Vieira; Santos, Miguel Arcanjo; Meira, Marconi Roberto; Meira, Mateus Duarte

    2017-01-01

    Percutaneous drainage of the bile ducts is an established procedure for malignant obstructions, in which a histological diagnosis is often not obtained. We describe the biopsy technique of obstructive lesions through biliary drainage access, using a 7F endoscopic biopsy forceps, widely available; some are even reusable. This technique applies to lesions of the hepatic ducts, of the common hepatic duct and of all extension of the common bile duct. RESUMO A drenagem percutânea das vias biliares é um procedimento estabelecido para obstruções malignas, nos quais, muitas vezes, não se consegue um diagnóstico histológico. Descrevemos a técnica de biópsia da lesão obstrutiva através do acesso de drenagem biliar, utilizando um fórcipe de biópsia endoscópica 7F, amplamente disponível e alguns reutilizáveis. Esta técnica aplica-se a lesões dos ductos hepáticos, do hepático comum e de toda extensão do colédoco.

  4. Reducing blood loss during laparoscopic myomectomy by temporary uterine artery clamping using bulldog clamp

    Directory of Open Access Journals (Sweden)

    Kai-Jo Chiang

    2014-01-01

    Full Text Available Uterine myoma is the most common benign gynecologic tumor worldwide. Mini-invasive surgery has become popular for myomectomy, with advantages over laparotomy. However, reducing blood loss during laparoscopic myomectomy is a major concern for the surgeon because of the limitation in making a quick control bleeding during the operation. Several methods have proved to decrease blood flow, but are not always effective or available. We present a case of uterine myoma with the uterine arteries clamped by bulldog clamps during laparoscopic myomectomy. The myoma was removed successfully with minimal blood loss (<50 ml during the operation. This is an effective, safe, and reliable method for reducing bleeding during laparoscopic myomectomy that does not require ligation of the uterine artery.

  5. Prostate biopsy: indications and technique.

    Science.gov (United States)

    Matlaga, Brian R; Eskew, L Andrew; McCullough, David L

    2003-01-01

    The last decade has seen numerous modifications in the way prostate cancer is diagnosed. We review the current indications for and methods of prostate biopsy. The English language literature was reviewed regarding major indications for and methods of prostate biopsy. Pertinent peer reviewed articles were collated and analyzed. The most widely accepted indication for prostate biopsy is a prostate specific antigen (PSA) value of greater than 4.0 ng./ml. However, some investigators advocate prostate biopsy for men with a PSA value in the 2.5 to 4.0 ng./ml. range, believing that use of this parameter results in detection of a greater number of cases of curable disease. Age specific PSA range, percent free PSA and presence of prostatic intraepithelial neoplasia or atypia are all considered to be relative indications for prostate biopsy. The current literature describes a trend toward increasing the number of cores obtained and the sites biopsied beyond those of the standard sextant technique. The additional cores in many series are obtained from more lateral regions of the gland. Although several criteria are used as indications for initial prostate biopsy, all are based on PSA level and/or abnormal digital rectal examination. Future improvements in currently used prostate cancer markers may result in better selection of cases to biopsy. There is no universally accepted technique of prostate gland biopsy. The current literature supports use of more extensive biopsy techniques to increase the likelihood of prostate cancer detection.

  6. The PCNA-RFC families of DNA clamps and clamp loaders.

    Science.gov (United States)

    Majka, Jerzy; Burgers, Peter M J

    2004-01-01

    The proliferating cell nuclear antigen PCNA functions at multiple levels in directing DNA metabolic pathways. Unbound to DNA, PCNA promotes localization of replication factors with a consensus PCNA-binding domain to replication factories. When bound to DNA, PCNA organizes various proteins involved in DNA replication, DNA repair, DNA modification, and chromatin modeling. Its modification by ubiquitin directs the cellular response to DNA damage. The ring-like PCNA homotrimer encircles double-stranded DNA and slides spontaneously across it. Loading of PCNA onto DNA at template-primer junctions is performed in an ATP-dependent process by replication factor C (RFC), a heteropentameric AAA+ protein complex consisting of the Rfc1, Rfc2, Rfc3, Rfc4, and Rfc5 subunits. Loading of yeast PCNA (POL30) is mechanistically distinct from analogous processes in E. coli (beta subunit by the gamma complex) and bacteriophage T4 (gp45 by gp44/62). Multiple stepwise ATP-binding events to RFC are required to load PCNA onto primed DNA. This stepwise mechanism should permit editing of this process at individual steps and allow for divergence of the default process into more specialized modes. Indeed, alternative RFC complexes consisting of the small RFC subunits together with an alternative Rfc1-like subunit have been identified. A complex required for the DNA damage checkpoint contains the Rad24 subunit, a complex required for sister chromatid cohesion contains the Ctf18 subunit, and a complex that aids in genome stability contains the Elg1 subunit. Only the RFC-Rad24 complex has a known associated clamp, a heterotrimeric complex consisting of Rad17, Mec3, and Ddc1. The other putative clamp loaders could either act on clamps yet to be identified or act on the two known clamps.

  7. New active load voltage clamp for HF-link converters

    DEFF Research Database (Denmark)

    Ljusev, Petar; Andersen, Michael Andreas E.

    2005-01-01

    This paper proposes a new active clamp for HF-link converters, which features very high efficiency by returning the clamped energy back to the primary side through a small auxiliary converter. It also increases the reliability of HF-link converters by providing an alternative load current path du...

  8. The problem of isotropic rectangular plate with four clamped edges

    Indian Academy of Sciences (India)

    uniformly distributed loads is a problem that has received considerable attention because of its technical importance. ... center deflection function of the fully clamped rectangular plate has three terms where the first one denotes ... An illustrative example is included of uniform load acting on a fully clamped rectangular plate.

  9. Off-clamp robotic partial nephrectomy: Technique and outcome.

    Science.gov (United States)

    Lamoshi, Abdulraouf Y; Salkini, Mohamad W

    2015-01-01

    Robotic partial nephrectomy (RPN) is a technically challenging procedure. Advanced skills are needed to accomplish tumor resection, hemostasis, and renorrhaphy within short ischemia time in RPN. Off-clamp RPN with zero ischemia may decrease the risk of ischemic reperfusion injury to the kidney. However, the off-clamp technique has been associated with an increased risk of blood loss. The purpose of this study was to evaluate the outcome of our modified off-clamp technique utilized in certain RPN cases. A total of 81 patients underwent RPN between September 2009 and July 2013 for renal masses. We studied a subgroup of patients who underwent off-clamp RPN with zero ischemia time. The off-clamp technique was utilized for exophytic, nonhilar tumors that have a base of 2 cm or less. We developed a novel technique to avoid ischemia reperfusion renal injury while minimizing blood loss in certain cases of RPN. Of the 81 cases of RPN, we reviewed and adopted the off-clamp technique in 34 patients (41.98%). Utilizing off-clamp RPN resulted in an average blood loss of 96.29 ml and 1.56 days (range: 1-3 days) of hospital stay and minimal change in serum creatinine. Off-clamp RPN is safe and feasible approach to excise certain kidney tumors. It carries the benefits of RPN and prevents ischemia reperfusion renal injury.

  10. Advanced patch-clamp techniques and single-channel analysis

    NARCIS (Netherlands)

    Biskup, B; Elzenga, JTM; Homann, U; Thiel, G; Wissing, F; Maathuis, FJM

    Much of our knowledge of ion-transport mechanisms in plant cell membranes comes from experiments using voltage-clamp. This technique allows the measurement of ionic currents across the membrane, whilst the voltage is held under experimental control. The patch-clamp technique was developed to study

  11. Studying mechanosensitive ion channels with an automated patch clamp

    NARCIS (Netherlands)

    Barthmes, Maria; Jose, Mac Donald F; Birkner, Jan Peter; Brüggemann, Andrea; Wahl-Schott, Christian; Kocer, Armagan

    Patch clamp electrophysiology is the main technique to study mechanosensitive ion channels (MSCs), however, conventional patch clamping is laborious and success and output depends on the skills of the operator. Even though automated patch systems solve these problems for other ion channels, they

  12. Laparoscopic off-clamp partial nephrectomy using soft coagulation.

    Science.gov (United States)

    Hongo, Fumiya; Kawauchi, Akihiro; Ueda, Takashi; Fujihara-Iwata, Atsuko; Nakamura, Terukazu; Naya, Yoshio; Kamoi, Kazumi; Okihara, Koji; Miki, Tsuneharu

    2015-08-01

    To assess the effectiveness of soft coagulation in off-clamp laparoscopic partial nephrectomy. A total of 32 patients with renal tumors underwent laparoscopic partial nephrectomy with off-clamp using soft coagulation between May 2012 and September 2013. Tumor resection was carried out using a combination of bipolar forceps and a ball electrode using the soft coagulation system without hilar clamping. The outcomes of these patients were compared with those of 30 patients treated with hilar clamping. This off-clamp procedure was successfully completed in 31 cases. No significant differences were observed in the mean age (60 vs 61 years), sex (male/female; 25/7 vs 20/10), mean RENAL nephrometry score (5.7 vs 5.8), mean body mass index (24.4 vs 23) or tumor size (15 mm vs 16 mm) between the two groups. No significant differences were noted in positive surgical margins (0 vs 0) or blood loss (104 vs 115 cc) as well. In contrast, a significant difference was noted in the total operative time (278 vs 238 min). Serum creatinine percentage changes at 3 months were 6.4 versus 7.3% in the off-clamp and hilum-clamp groups, respectively, which were not significantly different. Off-clamp laparoscopic partial nephrectomy can be safely carried out by using a soft coagulation technique. © 2015 The Japanese Urological Association.

  13. New active load voltage clamp for HF-link converters

    DEFF Research Database (Denmark)

    Ljusev, Petar; Andersen, Michael Andreas E.

    2005-01-01

    This paper proposes a new active clamp for HF-link converters, which features very high efficiency by returning the clamped energy back to the primary side through a small auxiliary converter. It also increases the reliability of HF-link converters by providing an alternative load current path...

  14. Evaluation of clamp effects on LMFBR piping systems

    International Nuclear Information System (INIS)

    Jones, G.L.

    1980-01-01

    Loop-type liquid metal breeder reactor plants utilize thin-wall piping to mitigate through-wall thermal gradients due to rapid thermal transients. These piping loops require a support system to carry the combined weight of the pipe, coolant and insulation and to provide attachments for seismic restraints. The support system examined here utilizes an insulated pipe clamp designed to minimize the stresses induced in the piping. To determine the effect of these clamps on the pipe wall a non-linear, two-dimensional, finite element model of the clamp, insulation and pipe wall was used to determine the clamp/pipe interface load distributions which were then applied to a three-dimensional, finite element model of the pipe. The two-dimensional interaction model was also utilized to estimate the combined clamp/pipe stiffness

  15. Establishment of euglycemic clamp technique in beagle dogs

    International Nuclear Information System (INIS)

    Dong Lihou; Song Haifeng

    2010-01-01

    Objective: To establish a euglycemic clamp technique in beagle dogs. Methods: The euglycemic clamp technique was applied in healthy beagle dogs and the blood glucose, insulin, C-peptide, insulin and glucagon were monitored during the clamp. Results: The blood glucose was controlled within the basal level. The coefficient of variation was less than 5% during the clamp. The serum insulin concentration finally reached (40.0 ± 3.8) mIU/L stably and a significant inhibition was shown in endogenous insulin by the determination of C-peptide. But there was no significant increase in serum glucagon compared with basal values. Conclusion: Methodology confirmed that the euglycemic clamp technique is successful in beagle dogs and can be applied in the study of pharmacodynamics of insulin preparations. (authors)

  16. The accuracy of colposcopic biopsy

    DEFF Research Database (Denmark)

    Stoler, Mark H; Vichnin, Michelle D; Ferenczy, Alex

    2011-01-01

    We evaluated the overall agreement between colposcopically directed biopsies and the definitive excisional specimens within the context of three clinical trials. A total of 737 women aged 16-45 who had a cervical biopsy taken within 6 months before their definitive therapy were included. Per......-protocol, colposcopists were to also obtain a representative cervical biopsy immediately before definitive therapy. Using adjudicated histological diagnoses, the initial biopsies and the same day biopsies were correlated with the surgically excised specimens. The overall agreement between the biopsies taken within 6...... months of definitive therapy, and the definitive therapy diagnoses was 42% (weighted kappa = 0.34) (95% CI: 0.29-0.39). The overall underestimation of cervical intraepithelial neoplasia grade 2/3 or adenocarcinoma in situ (CIN2-3/AIS) and CIN3/AIS was 26 and 42%, respectively. When allowing for one...

  17. Histological Value of Duodenal Biopsies

    Directory of Open Access Journals (Sweden)

    Limci Gupta

    2005-01-01

    Full Text Available This study was performed to see the value of histopathological diagnosis in management of patients with duodenal biopsies; to look for correlation of histology and serology in suspected cases of coeliac disease; the reasons for taking duodenal biopsies and whether proper adequate histories are provided on the forms sent with request for histopathological view on duodenal biopsies. Here are the observations of the study followed by the discussion.

  18. Cell-Detection Technique for Automated Patch Clamping

    Science.gov (United States)

    McDowell, Mark; Gray, Elizabeth

    2008-01-01

    A unique and customizable machinevision and image-data-processing technique has been developed for use in automated identification of cells that are optimal for patch clamping. [Patch clamping (in which patch electrodes are pressed against cell membranes) is an electrophysiological technique widely applied for the study of ion channels, and of membrane proteins that regulate the flow of ions across the membranes. Patch clamping is used in many biological research fields such as neurobiology, pharmacology, and molecular biology.] While there exist several hardware techniques for automated patch clamping of cells, very few of those techniques incorporate machine vision for locating cells that are ideal subjects for patch clamping. In contrast, the present technique is embodied in a machine-vision algorithm that, in practical application, enables the user to identify good and bad cells for patch clamping in an image captured by a charge-coupled-device (CCD) camera attached to a microscope, within a processing time of one second. Hence, the present technique can save time, thereby increasing efficiency and reducing cost. The present technique involves the utilization of cell-feature metrics to accurately make decisions on the degree to which individual cells are "good" or "bad" candidates for patch clamping. These metrics include position coordinates (x,y) in the image plane, major-axis length, minor-axis length, area, elongation, roundness, smoothness, angle of orientation, and degree of inclusion in the field of view. The present technique does not require any special hardware beyond commercially available, off-the-shelf patch-clamping hardware: A standard patchclamping microscope system with an attached CCD camera, a personal computer with an imagedata- processing board, and some experience in utilizing imagedata- processing software are all that are needed. A cell image is first captured by the microscope CCD camera and image-data-processing board, then the image

  19. Cognitive MRI-TRUS fusion-targeted prostate biopsy according to PI-RADS classification in patients with prior negative systematic biopsy results

    OpenAIRE

    Lai, Wei-Jen; Wang, Hsin-Kai; Liu, Hsian-Tzu; Park, Byung Kwan; Shen, Shu-Huei; Lin, Tzu-Ping; Chung, Hsiao-Jen; Huang, Yi-Hsiu; Chang, Yen-Hwa

    2016-01-01

    Background: The purpose of this study was to evaluate the prostate cancer yield rate of targeted transrectal ultrasound (TRUS)-guided biopsy with cognitive magnetic resonance imaging (MRI) registration without concurrent systematic biopsy in patients with previous negative systematic TRUS-guided biopsy results and persistently elevated prostate-specific antigen (PSA) levels. Methods: In this prospective study conducted from August 2013 to January 2015, patients with at least one previous n...

  20. Trends in Aortic Clamp Use During Coronary Artery Bypass Surgery: The Effect of Aortic Clamping Strategies on Neurologic Outcomes

    Science.gov (United States)

    Daniel, William T.; Kilgo, Patrick; Puskas, John D.; Thourani, Vinod H.; Lattouf, Omar M.; Guyton, Robert A.; Halkos, Michael E.

    2013-01-01

    Objective The purpose of this study was to determine the impact of different clamping strategies during CABG on the incidence of postoperative stroke. Methods In this case-control study, all patients at Emory hospitals from 2002–2009 with postoperative stroke after isolated CABG (N=141) were matched 1:4 to a contemporaneous cohort of patients without postoperative stroke (N=565). Patients were matched according to the Society of Thoracic Surgeons (STS) Predicted Risk of Postoperative Stroke (PROPS), which is based on 26 variables. On- (ONCAB) and off-pump (OPCAB) patients were matched separately. Multiple logistic regression analysis with adjusted odds ratios (OR) was performed to identify operative variables associated with postoperative stroke. Results Among the ONCAB cohort, the single cross-clamp technique was associated with a decreased risk of stroke compared to the double clamp (cross clamp + partial clamp) technique (OR=0.385, p=0.044). Within the OPCAB cohort, there was no significant difference in stroke according to clamp use. Epiaortic ultrasound of the ascending aorta increased from 45.3% in 2002 to 89.4% in 2009. From 2002–2009, clamp use decreased from 97.7% of cases to 72.7%. Conclusions During ONCAB, the use of a single cross-clamp compared to the double clamp technique decreases the risk of postoperative stroke. The use of any aortic clamp has decreased and epiaortic ultrasound use has increased from 2002–2009, indicating a change in operative technique and surgeon awareness of the potential complications associated with manipulation of the aorta. PMID:23477689

  1. Comparison of the Analytical Performance Between cobas EGFR Assay and PCR-Clamp Method in the Detection of EGFR Mutations in Japanese Non-Small Cell Lung Cancer Patients.

    Science.gov (United States)

    Ai, Tomohiko; Yuri, Maiko; Tabe, Yoko; Kakimoto, Atsushi; Morishita, Soji; Tsuchiya, Koji; Takamochi, Kazuya; Kodama, Yuzo; Takahashi, Fumiyuki; Shigeki, Misawa; Horii, Takashi; Suzuki, Kenji; Takahashi, Kazuhisa; Miida, Takashi; Ohsaka, Akimichi

    2017-05-01

    EGFR, a tyrosine-kinase, plays an important role in the progression of lung cancer. Since genetic abnormality of EGFR alters the effects of tyrosine-kinase inhibitors targeting EGFR, molecular analyses of EGFR have recently gained more attention in the treatment of lung cancer. However, several different techniques are available and which method is superior has not been determined. In this study, we compared two recently developed PCR-based techniques, PCR-clamp method and cobas EGFR assay. Ninety-four surgical samples and 58 biopsy samples from patients suffering from non-small cell lung cancers (NSCLCs) were included in the study. Samples with positive and negative genetic abnormalities, 66 and 28 respectively, were chosen for PCR-Clamp methods. Those same samples were reanalyzed with cobas EGFR assay. The concordance between PCR-Clamp and cobas EGFR methods was 95.7%. PCR-Clamp failed to detect four mutations that were detected with cobas EGFR assay. These two methods were further tested by analyzing 58 random biopsy samples. The concordance for the biopsy samples was 93.1%, and PCR-Clamp, again, failed to detect three mutations that were detected with cobas EGFR assay. Our results showed both methods detected most of the known EGFR mutations and the concordance was similar to those previously reported in different ethnicities. However, in our study, PCR-Clamp method failed to detect a total of seven mutations that were detected with cobas EGFR assay. Thus, we concluded that cobas EGFR assay is an easier and more accurate screening assay than PCR-Clamp method in detecting EGFR genetic abnormalities.

  2. Is "Delayed Umbilical Cord Clamping" Beneficial for Premature Newborns?

    Directory of Open Access Journals (Sweden)

    Amir-Mohammad Armanian

    2017-05-01

    Full Text Available Background: The appropriate moment for clamping the umbilical cord is controversial. Immediate cord clamping (ICC is an item of active management of the third stage of labor (AMTSL. Unclamped umbilical cord may cause inconvenience in preterm neonates because they commonly need some levels of emergent services. Some studies revealed delayed cord clamping (DCC of preterm neonates results in better health conditions like lower rates of respiratory distress syndrome (RDS, less morbidities in labor room and lower risk of postpartum hemorrhage. The aim of the present study was to determine the effect of delayed umbilical cord clamping on premature neonatal outcomes. Materials and Methods: In this single‑center randomized control trial study, sixty premature neonates (gestational age ≤ 34 weeks were randomly assigned to ICC (cord clamped at 5–10 seconds or DCC (30–45 seconds groups and followed up in neonatal intensive care unit (NICU. Primary outcomes were 1st and 5th minute Apgar score, average of level of hematocrit after birth, intra ventricle hemorrhage and need some levels of resuscitation. Results: Differences in demographic characteristics were not statistically significant. After birth, neonates who had delayed clamping had significantly higher mean hematocrit after at 4-hour of birth (49.58+5.15gr/dl vs. 46.58+5.40gr/dlin DCC vs. ICC groups, respectively (P=0.031. Delayed cord clamping reduced the duration of need to nasal continues positive airway pressure (NCPAP (86.7% and 60.0% in ICC and DCC groups, respectively, P= 0.039. Attractively, the results showed lower incidence of clinical sepsis in delayed cord clamping neonates (53.3% vs. 23.3% in ICC and DCC groups, respectively, P=0.033. Conclusion: Prematurity complications might decrease by delay umbilical cord clamping which improve the hematocrit, duration of need to NCPAP and incidence of clinical sepsis. Furthermore, DCC may have no negative impact on neonatal resuscitation.

  3. Planar patch-clamp force microscopy on living cells

    Energy Technology Data Exchange (ETDEWEB)

    Pamir, Evren [Center for Nano Science, Ludwig-Maximilians University, Amalienstr 54, 80799 Munich (Germany); George, Michael; Fertig, Niels [Nanion Technologies GmbH, Erzgiessereistr. 4, 80335 Munich (Germany); Benoit, Martin [Center for Nano Science, Ludwig-Maximilians University, Amalienstr 54, 80799 Munich (Germany)], E-mail: martin.benoit@physik.uni-muenchen.de

    2008-05-15

    Here we report a new combination of the patch-clamp technique with the atomic force microscope (AFM). A planar patch-clamp chip microstructured from borosilicate glass was used as a support for mechanical probing of living cells. The setup not only allows for immobilizing even a non-adherent cell for measurements of its mechanical properties, but also for simultaneously measuring the electrophysiological properties of a single cell. As a proof of principle experiment we measured the voltage-induced membrane movement of HEK293 and Jurkat cells in the whole-cell voltage clamp configuration. The results of these measurements are in good agreement with previous studies. By using the planar patch-clamp chip for immobilization, the AFM not only can image non-adhering cells, but also gets easily access to an electrophysiologically controlled cellular probe at low vibrational noise.

  4. Dynamic clamp: a powerful tool in cardiac electrophysiology

    NARCIS (Netherlands)

    Wilders, Ronald

    2006-01-01

    Dynamic clamp is a collection of closely related techniques that have been employed in cardiac electrophysiology to provide direct answers to numerous research questions regarding basic cellular mechanisms of action potential formation, action potential transfer and action potential synchronization

  5. Prediction of clamp-derived insulin sensitivity from the oral glucose insulin sensitivity index.

    Science.gov (United States)

    Tura, Andrea; Chemello, Gaetano; Szendroedi, Julia; Göbl, Christian; Færch, Kristine; Vrbíková, Jana; Pacini, Giovanni; Ferrannini, Ele; Roden, Michael

    2018-05-01

    The euglycaemic-hyperinsulinaemic clamp is the gold-standard method for measuring insulin sensitivity, but is less suitable for large clinical trials. Thus, several indices have been developed for evaluating insulin sensitivity from the oral glucose tolerance test (OGTT). However, most of them yield values different from those obtained by the clamp method. The aim of this study was to develop a new index to predict clamp-derived insulin sensitivity (M value) from the OGTT-derived oral glucose insulin sensitivity index (OGIS). We analysed datasets of people that underwent both a clamp and an OGTT or meal test, thereby allowing calculation of both the M value and OGIS. The population was divided into a training and a validation cohort (n = 359 and n = 154, respectively). After a stepwise selection approach, the best model for M value prediction was applied to the validation cohort. This cohort was also divided into subgroups according to glucose tolerance, obesity category and age. The new index, called PREDIcted M (PREDIM), was based on OGIS, BMI, 2 h glucose during OGTT and fasting insulin. Bland-Altman analysis revealed a good relationship between the M value and PREDIM in the validation dataset (only 9 of 154 observations outside limits of agreement). Also, no significant differences were found between the M value and PREDIM (equivalence test: p < 0.0063). Subgroup stratification showed that measured M value and PREDIM have a similar ability to detect intergroup differences (p < 0.02, both M value and PREDIM). The new index PREDIM provides excellent prediction of M values from OGTT or meal data, thereby allowing comparison of insulin sensitivity between studies using different tests.

  6. Reoperative sentinel lymph node biopsy after previous mastectomy.

    Science.gov (United States)

    Karam, Amer; Stempel, Michelle; Cody, Hiram S; Port, Elisa R

    2008-10-01

    Sentinel lymph node (SLN) biopsy is the standard of care for axillary staging in breast cancer, but many clinical scenarios questioning the validity of SLN biopsy remain. Here we describe our experience with reoperative-SLN (re-SLN) biopsy after previous mastectomy. Review of the SLN database from September 1996 to December 2007 yielded 20 procedures done in the setting of previous mastectomy. SLN biopsy was performed using radioisotope with or without blue dye injection superior to the mastectomy incision, in the skin flap in all patients. In 17 of 20 patients (85%), re-SLN biopsy was performed for local or regional recurrence after mastectomy. Re-SLN biopsy was successful in 13 of 20 patients (65%) after previous mastectomy. Of the 13 patients, 2 had positive re-SLN, and completion axillary dissection was performed, with 1 having additional positive nodes. In the 11 patients with negative re-SLN, 2 patients underwent completion axillary dissection demonstrating additional negative nodes. One patient with a negative re-SLN experienced chest wall recurrence combined with axillary recurrence 11 months after re-SLN biopsy. All others remained free of local or axillary recurrence. Re-SLN biopsy was unsuccessful in 7 of 20 patients (35%). In three of seven patients, axillary dissection was performed, yielding positive nodes in two of the three. The remaining four of seven patients all had previous modified radical mastectomy, so underwent no additional axillary surgery. In this small series, re-SLN was successful after previous mastectomy, and this procedure may play some role when axillary staging is warranted after mastectomy.

  7. PET-guided breast biopsy.

    Science.gov (United States)

    Kalinyak, Judith E; Schilling, Kathy; Berg, Wendie A; Narayanan, Deepa; Mayberry, Jennifer P; Rai, Rajesh; Dupree, Elizabeth B; Shusterman, Denise K; Gittleman, Mark A; Luo, Weidong; Matthews, Chris G

    2011-01-01

    Molecular imaging, using positron emission tomography (PET), has become an integral step in the evaluation of many patients with malignancy. However, its use in patients with breast cancer has been limited by the lower levels of (18) F-fluorodeoxyglucose (FDG) uptake in some breast malignancies compared to other cancers, the small size of many breast cancers, and the need for biopsy under PET guidance. High-resolution breast PET, or positron emission mammography (PEM), with biopsy guidance software, now addresses these issues. We report a prospective, multicenter study designed to test the efficacy and safety of PEM biopsy guidance software in women with FDG-avid breast lesions worrisome for malignancy. The intervention chosen was vacuum-assisted core biopsy. Nineteen subjects underwent a total of 24 PEM-guided biopsies. All lesions were successfully targeted and sampled as determined by post-biopsy image scan evaluation, specimen imaging, and pathologic concordance. Invasive cancer was identified in 13 of 24 lesions (54%), while four (17%) were high-risk lesions and three of these were upgraded to malignancy at excision. No serious adverse events occurred and all patients found the procedure to cause only minimal to mild discomfort. High-resolution PEM-guided breast biopsy is both safe and effective for the sampling of PET-depicted breast lesions. © 2011 Wiley Periodicals, Inc.

  8. ATP binding and hydrolysis-driven rate-determining events in the RFC-catalyzed PCNA clamp loading reaction.

    Science.gov (United States)

    Sakato, Miho; Zhou, Yayan; Hingorani, Manju M

    2012-02-17

    The multi-subunit replication factor C (RFC) complex loads circular proliferating cell nuclear antigen (PCNA) clamps onto DNA where they serve as mobile tethers for polymerases and coordinate the functions of many other DNA metabolic proteins. The clamp loading reaction is complex, involving multiple components (RFC, PCNA, DNA, and ATP) and events (minimally: PCNA opening/closing, DNA binding/release, and ATP binding/hydrolysis) that yield a topologically linked clamp·DNA product in less than a second. Here, we report pre-steady-state measurements of several steps in the reaction catalyzed by Saccharomyces cerevisiae RFC and present a comprehensive kinetic model based on global analysis of the data. Highlights of the reaction mechanism are that ATP binding to RFC initiates slow activation of the clamp loader, enabling it to open PCNA (at ~2 s(-1)) and bind primer-template DNA (ptDNA). Rapid binding of ptDNA leads to formation of the RFC·ATP·PCNA(open)·ptDNA complex, which catalyzes a burst of ATP hydrolysis. Another slow step in the reaction follows ATP hydrolysis and is associated with PCNA closure around ptDNA (8 s(-1)). Dissociation of PCNA·ptDNA from RFC leads to catalytic turnover. We propose that these early and late rate-determining events are intramolecular conformational changes in RFC and PCNA that control clamp opening and closure, and that ATP binding and hydrolysis switch RFC between conformations with high and low affinities, respectively, for open PCNA and ptDNA, and thus bookend the clamp loading reaction. Copyright © 2011 Elsevier Ltd. All rights reserved.

  9. The Drosophila CLAMP protein associates with diverse proteins on chromatin.

    Science.gov (United States)

    Urban, Jennifer A; Urban, John M; Kuzu, Guray; Larschan, Erica N

    2017-01-01

    Gaining new insights into gene regulation involves an in-depth understanding of protein-protein interactions on chromatin. A powerful model for studying mechanisms of gene regulation is dosage compensation, a process that targets the X-chromosome to equalize gene expression between XY males and XX females. We previously identified a zinc finger protein in Drosophila melanogaster that plays a sex-specific role in targeting the Male-specific lethal (MSL) dosage compensation complex to the male X-chromosome, called the Chromatin-Linked Adapter for MSL Proteins (CLAMP). More recently, we established that CLAMP has non-sex-specific roles as an essential protein that regulates chromatin accessibility at promoters genome-wide. To identify associations between CLAMP and other factors in both male and female cells, we used two complementary mass spectrometry approaches. We demonstrate that CLAMP associates with the transcriptional regulator complex Negative Elongation Factor (NELF) in both sexes and determine that CLAMP reduces NELF recruitment to several target genes. In sum, we have identified many new CLAMP-associated factors and provide a resource for further study of this little understood essential protein.

  10. Force-controlled patch clamp of beating cardiac cells.

    Science.gov (United States)

    Ossola, Dario; Amarouch, Mohamed-Yassine; Behr, Pascal; Vörös, János; Abriel, Hugues; Zambelli, Tomaso

    2015-03-11

    From its invention in the 1970s, the patch clamp technique is the gold standard in electrophysiology research and drug screening because it is the only tool enabling accurate investigation of voltage-gated ion channels, which are responsible for action potentials. Because of its key role in drug screening, innovation efforts are being made to reduce its complexity toward more automated systems. While some of these new approaches are being adopted in pharmaceutical companies, conventional patch-clamp remains unmatched in fundamental research due to its versatility. Here, we merged the patch clamp and atomic force microscope (AFM) techniques, thus equipping the patch-clamp with the sensitive AFM force control. This was possible using the FluidFM, a force-controlled nanopipette based on microchanneled AFM cantilevers. First, the compatibility of the system with patch-clamp electronics and its ability to record the activity of voltage-gated ion channels in whole-cell configuration was demonstrated with sodium (NaV1.5) channels. Second, we showed the feasibility of simultaneous recording of membrane current and force development during contraction of isolated cardiomyocytes. Force feedback allowed for a gentle and stable contact between AFM tip and cell membrane enabling serial patch clamping and injection without apparent cell damage.

  11. Modelling methods in stress analysis of pipe coupling clamps

    International Nuclear Information System (INIS)

    Dutta, B.K.; Kushwaha, H.S.; Kakodkar, A.

    1987-01-01

    Pipe coupling using clamps are becoming more and more popular components in nuclear power plants and are used in place of conventional flanges because of their compactness, easy maintenance and more reliability. They are used in large numbers in Pressurised Heavy Water Reactors (PHWR) such as at the joint between feeder pipe and end-fitting, in F/M housing etc. Integrity of these clamps have direct effect on overall safety of the nuclear power plants. This necessitates proper design, fabrication, installation and maintenance of these components. Proper design of these clamps is a challenge to the designer. This is because of changing boundary conditions at the interface with the hub during various stages of loading. A detail stress analysis of clamps considering changing boundary conditions under various loadings can be done using finite element technique. In the following sections, two finite element modelling methods to simulate clamps along with hubs are described. Both these methods assumed absence of friction between the clamp and hubs during bolting, whereas absence of relative movement between them was assumed during other stages of loadings. (orig.)

  12. Equity yields

    NARCIS (Netherlands)

    Vrugt, E.; van Binsbergen, J.H.; Koijen, R.S.J.; Hueskes, W.

    2013-01-01

    We study a new data set of dividend futures with maturities up to ten years across three world regions: the US, Europe, and Japan. We use these asset prices to construct equity yields, analogous to bond yields. We decompose the equity yields to obtain a term structure of expected dividend growth

  13. Cognitive MRI-TRUS fusion-targeted prostate biopsy according to PI-RADS classification in patients with prior negative systematic biopsy results.

    Science.gov (United States)

    Lai, Wei-Jen; Wang, Hsin-Kai; Liu, Hsian-Tzu; Park, Byung Kwan; Shen, Shu-Huei; Lin, Tzu-Ping; Chung, Hsiao-Jen; Huang, Yi-Hsiu; Chang, Yen-Hwa

    2016-11-01

    The purpose of this study was to evaluate the prostate cancer yield rate of targeted transrectal ultrasound (TRUS)-guided biopsy with cognitive magnetic resonance imaging (MRI) registration without concurrent systematic biopsy in patients with previous negative systematic TRUS-guided biopsy results and persistently elevated prostate-specific antigen (PSA) levels. In this prospective study conducted from August 2013 to January 2015, patients with at least one previous negative systematic TRUS-guided biopsy and persistently high PSA (≥4 ng/mL) levels were referred for multiparametric MRI (mpMRI). Those patients with suspicious findings on mpMRI received a subsequent cognitive MRI-TRUS fusion biopsy. The cancer-detection rate, tumor location, and Gleason score were confirmed, and PSA-related data were compared between cancer-yield and noncancer-yield groups. In total, 48 patients were included in this study. MRI was designated to be four and five in 17 patients. Fifteen patients received a cognitive fusion-targeted biopsy, and prostate cancers were detected in 10 patients. The cancer-detection rate was 20.8% (10/48), and the positive-predictive value of MRI was 66.7%. No significant differences were observed in the PSA level, PSA velocity, or transitional zone volume between the cancer-yield and noncancer-yield groups; however, the corresponding difference in PSA transitional zone density was significant (p=0.025). Cognitive MRI-TRUS fusion-targeted biopsy without concurrent systematic biopsy can detect significant prostate cancer in patients with previous negative systematic biopsy results and persistently elevated PSA levels. Noncancer-yield patients should undergo active surveillance and further follow-ups. Copyright © 2016. Published by Elsevier Taiwan LLC.

  14. Ventilation onset prior to umbilical cord clamping (physiological-based cord clamping improves systemic and cerebral oxygenation in preterm lambs.

    Directory of Open Access Journals (Sweden)

    Graeme R Polglase

    Full Text Available As measurement of arterial oxygen saturation (SpO2 is common in the delivery room, target SpO2 ranges allow clinicians to titrate oxygen therapy for preterm infants in order to achieve saturation levels similar to those seen in normal term infants in the first minutes of life. However, the influence of the onset of ventilation and the timing of cord clamping on systemic and cerebral oxygenation is not known.We investigated whether the initiation of ventilation, prior to, or after umbilical cord clamping, altered systemic and cerebral oxygenation in preterm lambs.Systemic and cerebral blood-flows, pressures and peripheral SpO2 and regional cerebral tissue oxygenation (SctO2 were measured continuously in apnoeic preterm lambs (126±1 day gestation. Positive pressure ventilation was initiated either 1 prior to umbilical cord clamping, or 2 after umbilical cord clamping. Lambs were monitored intensively prior to intervention, and for 10 minutes following umbilical cord clamping.Clamping the umbilical cord prior to ventilation resulted in a rapid decrease in SpO2 and SctO2, and an increase in arterial pressure, cerebral blood flow and cerebral oxygen extraction. Ventilation restored oxygenation and haemodynamics by 5-6 minutes. No such disturbances in peripheral or cerebral oxygenation and haemodynamics were observed when ventilation was initiated prior to cord clamping.The establishment of ventilation prior to umbilical cord clamping facilitated a smooth transition to systemic and cerebral oxygenation following birth. SpO2 nomograms may need to be re-evaluated to reflect physiological management of preterm infants in the delivery room.

  15. Ventilation onset prior to umbilical cord clamping (physiological-based cord clamping) improves systemic and cerebral oxygenation in preterm lambs.

    Science.gov (United States)

    Polglase, Graeme R; Dawson, Jennifer A; Kluckow, Martin; Gill, Andrew W; Davis, Peter G; Te Pas, Arjan B; Crossley, Kelly J; McDougall, Annie; Wallace, Euan M; Hooper, Stuart B

    2015-01-01

    As measurement of arterial oxygen saturation (SpO2) is common in the delivery room, target SpO2 ranges allow clinicians to titrate oxygen therapy for preterm infants in order to achieve saturation levels similar to those seen in normal term infants in the first minutes of life. However, the influence of the onset of ventilation and the timing of cord clamping on systemic and cerebral oxygenation is not known. We investigated whether the initiation of ventilation, prior to, or after umbilical cord clamping, altered systemic and cerebral oxygenation in preterm lambs. Systemic and cerebral blood-flows, pressures and peripheral SpO2 and regional cerebral tissue oxygenation (SctO2) were measured continuously in apnoeic preterm lambs (126±1 day gestation). Positive pressure ventilation was initiated either 1) prior to umbilical cord clamping, or 2) after umbilical cord clamping. Lambs were monitored intensively prior to intervention, and for 10 minutes following umbilical cord clamping. Clamping the umbilical cord prior to ventilation resulted in a rapid decrease in SpO2 and SctO2, and an increase in arterial pressure, cerebral blood flow and cerebral oxygen extraction. Ventilation restored oxygenation and haemodynamics by 5-6 minutes. No such disturbances in peripheral or cerebral oxygenation and haemodynamics were observed when ventilation was initiated prior to cord clamping. The establishment of ventilation prior to umbilical cord clamping facilitated a smooth transition to systemic and cerebral oxygenation following birth. SpO2 nomograms may need to be re-evaluated to reflect physiological management of preterm infants in the delivery room.

  16. Clamp and clamp loader structures of the human checkpoint protein complexes, Rad9-1-1 and Rad17-RFC.

    Science.gov (United States)

    Shiomi, Yasushi; Shinozaki, Ayako; Nakada, Daisuke; Sugimoto, Katsunori; Usukura, Jiro; Obuse, Chikashi; Tsurimoto, Toshiki

    2002-08-01

    We have reported that protein imaging by transmission electron microscope observation based on low-angle platinum shadowing can reproduce characteristic ring structures of the replication clamp, proliferating cell nuclear antigen (PCNA), and the clamp loader protein, replication factor C (RFC). The checkpoint protein complexes, Rad9-Hus1-Rad1 (Rad9-1-1) and Rad17-RFCs2-5 (Rad17-RFC), have been predicted to function as novel clamp and clamp loader proteins, respectively, due to their amino acid sequence similarities with PCNA and RFC. We reconstituted human Rad9-1-1 and Rad17-RFC complexes in insect cells using a baculovirus expression system and showed purified Rad9-1-1 to be composed of equimolar amounts of Rad9, Hus1 and Rad1 proteins, exhibiting a native molecular mass of 100 kDa, in line with a trimeric complex. When Rad17 was co-expressed with the four small subunits of RFC in insect cells, these proteins formed a complex of 240 kDa that displayed DNA binding, ATPase activity and binding to its predicted target protein, Rad9-1-1. Analyses of the molecular architecture of Rad9-1-1 and Rad17-RFC using transmission electron microscopy, in comparison with PCNA and RFC, revealed the Rad9-1-1 complex to have a characteristic ring structure indistinguishable from that of PCNA in shape and size. In addition, the Rad17-RFC complex was found to be oval in structure and 26 x 22 nm in size with a cleft, reminiscent of the structure of RFC. Our direct comparison of images from the two sets of clamp and clamp loader proteins indicated that Rad9-1-1 and Rad17-RFC are, respectively, structural orthologs of PCNA and RFC, with presumed functions as novel clamp and clamp-loader proteins in eukaryotes.

  17. Optical biopsy of epithelial cancers by optical coherence tomography (OCT)

    NARCIS (Netherlands)

    Wessels, R.; de Bruin, D. M.; Faber, D. J.; van Leeuwen, T. G.; van Beurden, M.; Ruers, T. J. M.

    2014-01-01

    Optical coherence tomography (OCT) is an optical technique that measures the backscattering of near-infrared light by tissue. OCT yields in 2D and 3D images at micrometer-scale resolution, thus providing optical biopsies, approaching the resolution of histopathological imaging. The technique has

  18. Optical biopsy of epithelial cancers by optical coherence tomography

    NARCIS (Netherlands)

    Wessels, R.; Wessels, R.; de Bruin, D.M.; Faber, D.J.; van Leeuwen, Ton; van Beurden, M.F.B.; Ruers, Theo J.M.

    2014-01-01

    Optical coherence tomography (OCT) is an optical technique that measures the backscattering of near-infrared light by tissue. OCT yields in 2D and 3D images at micrometer-scale resolution, thus providing optical biopsies, approaching the resolution of histopathological imaging. The technique has

  19. A new clamp method for firing bricks | Obeng | Journal of Applied ...

    African Journals Online (AJOL)

    A new clamp method for firing bricks. ... Journal of Applied Science and Technology ... To overcome this operational deficiencies, a new method of firing bricks that uses brick clamp technique that incorporates a clamp wall of 60 cm thickness, a six tier approach of sealing the top of the clamp (by combination of green bricks) ...

  20. Dynamic clamp as a tool to study the functional effects of individual membrane currents

    NARCIS (Netherlands)

    Berecki, Géza; Verkerk, Arie O.; van Ginneken, Antoni C. G.; Wilders, Ronald

    2014-01-01

    Today, the patch-clamp technique is the main technique in electrophysiology to record action potentials or membrane current from isolated cells, using a patch pipette to gain electrical access to the cell. The common recording modes of the patch-clamp technique are current clamp and voltage clamp.

  1. Measuring beta-cell function relative to insulin sensitivity in youth: Does the hyperglycemic clamp suffice?

    Science.gov (United States)

    To compare beta-cell function relative to insulin sensitivity, disposition index (DI), calculated from two clamps (2cDI, insulin sensitivity from the hyperinsulinemic-euglycemic clamp and first-phase insulin from the hyperglycemic clamp) with the DI calculated from the hyperglycemic clamp alone (hcD...

  2. Ultrasonic Needles for Bone Biopsy.

    Science.gov (United States)

    Mathieson, Andrew; Wallace, Robert; Cleary, Rebecca; Li Li; Simpson, Hamish; Lucas, Margaret

    2017-02-01

    Bone biopsy is an invasive clinical procedure, where a bone sample is recovered for analysis during the diagnosis of a medical condition. When the architecture of the bone tissue is required to be preserved, a core-needle biopsy is taken. Although this procedure is performed while the patient is under local anaesthesia, the patient can still experience significant discomfort. Additionally, large haematoma can be induced in the soft tissue surrounding the biopsy site due to the large axial and rotational forces, which are applied through the needle to penetrate bone. It is well documented that power ultrasonic surgical devices offer the advantages of low cutting force, high accuracy, and preservation of soft tissues. This paper reports a study of the design, analysis, and test of two novel power ultrasonic needles for bone biopsy that operate using different configurations to penetrate bone. The first utilizes micrometric vibrations generated at the distil tip of a full-wavelength resonant ultrasonic device, while the second utilizes an ultrasonic-sonic approach, where vibrational energy generated by a resonant ultrasonic horn is transferred to a needle via the chaotic motion of a free-mass. It is shown that the dynamic behavior of the devices identified through experimental techniques closely match the behavior calculated through numerical and finite-element analysis methods, demonstrating that they are effective design tools for these devices. Both devices were able to recover trabecular bone from the metaphysis of an ovine femur, and the biopsy samples were found to be comparable to a sample extracted using a conventional biopsy needle. Furthermore, the resonant needle device was also able to extract a cortical bone sample from the central diaphysis, which is the strongest part of the bone, and the biopsy was found to be superior to the sample recovered by a conventional bone biopsy needle.

  3. Does repeat biopsy affect the prognosis of patients with prostate cancer treated with radical prostatectomy? Analysis by the number of cores taken at initial biopsy.

    Science.gov (United States)

    Park, Myungchan; You, Dalsan; Yoon, Jong Hyun; Jeong, In Gab; Song, Cheryn; Hong, Jun Hyuk; Ahn, Hanjong; Kim, Choung-Soo

    2012-05-01

    Study Type - Therapy (case series) Level of Evidence 4 What's known on the subject? and What does the study add? To date, studies to evaluate clinical significance of prostate cancer detected on repeat biopsy in patients who underwent radical prostatectomy have yielded inconsistent results. The present study confirms that prostate cancer diagnosed after repeat biopsies is related to better pathological outcomes after radical prostatectomy, but not predictive of biochemical recurrence. Additionally, we find that the number of cores taken at initial biopsy do not affect the association between the number of previous biopsies and the prognosis. To determine whether repeat prostate biopsies are associated with more favourable prognoses compared with diagnosis at initial biopsy in patients who undergo radical prostatectomy for prostate cancer and to determine if this association is affected by the number of cores taken at initial biopsy. We reviewed 1147 patients with prostate cancer from 1991 to 2008. Patients were stratified into two groups by the number of biopsies before diagnosis (initial biopsy vs repeat biopsy: at least two biopsies). The effects of several variables on pathological outcomes and biochemical recurrence-free and systemic progression-free survivals were assessed. Of the 1147 patients, 1064 (92.8%) were diagnosed with cancer at first biopsy and 83 (7.2%) at repeat biopsy. Compared with patients diagnosed at initial biopsy, those diagnosed at repeat biopsies were more likely to have a lower clinical stage (cT1c: 79.5% vs 55.5%, P number (8.3 vs 8.7, P= 0.373). Five-year biochemical recurrence-free and progression-free survival rates did not show significant differences between the two groups (88.8% vs 82.2%, P= 0.078; 100.0% vs 96.5%, P= 0.105, respectively), and these results were not affected by the number of cores taken at initial biopsy. Although prostate cancer diagnosed after repeat biopsies was related to better pathological outcomes after

  4. The Value of Endocervical Curettage in Addition to Biopsies in Women Referred to Colposcopy

    NARCIS (Netherlands)

    van der Marel, Jacolien; Rodriguez, Agata; del Pino, Marta; van Baars, Romy; Jenkins, David; van de Sandt, Miekel M.; Torne, Aureli; Ordi, Jaume; ter Harmsel, Bram; Verheijen, Rene H. M.; Schiffman, Mark; Gage, Julia C.; Quint, Wim G. V.; Wentzensen, Nicolas

    2015-01-01

    Objective Performing endocervical curettage (ECC) at colposcopy may increase the yield of cervical intraepithelial neoplasia grade 2 (CIN2) or worse (CIN2+) compared to biopsies alone. The additional benefit of ECC in detecting CIN2+ was studied in women with lesion-targeted biopsies (low-grade or

  5. Targeting the β-clamp in Helicobacter pylori with FDA-approved drugs reveals micromolar inhibition by diflunisal.

    Science.gov (United States)

    Pandey, Preeti; Verma, Vijay; Gautam, Gunjan; Kumari, Nilima; Dhar, Suman Kumar; Gourinath, Samudrala

    2017-08-01

    The β-clamp is the processivity-promoting factor for most of the enzymes in prokaryotic DNA replication; hence, it is a crucial drug target. In the present study, we investigated the β-clamp from Helicobacter pylori, aiming to seek potential drug molecules against this gastric-cancer-causing bacterium. An in silico screening of Food and Drug Administration (FDA) approved drugs against the H. pylori β-clamp, followed by its in vitro inhibition using a surface competition approach, yielded the drug diflunisal as a positive initial hit. Diflunisal inhibits the growth of H. pylori in the micromolar range. We determined the structure of diflunisal in complex with the β-clamp to show that the drug binds at subsite I, which is a protein-protein interaction site. Successful identification of FDA-approved molecules against H. pylori may lead to better and faster drug development. © 2017 Federation of European Biochemical Societies.

  6. A NOVEL SINGLE IMPEDANCE NETWORK BASED NEUTRAL POINT CLAMPED SEVEN LEVEL THREE PHASE INVETER WITH REDUCED CLAMPING DIODES FOR REGENERATIVE APPLICATIONS

    OpenAIRE

    T. A. Raghavendiran; C.L.Kuppuswamy

    2012-01-01

    A Multilevel Inverter (MLI) can eliminate the need for the step-up transformer and reduce the harmonics produced by the inverter. This paper presents Neutral Point Clamped (NPC) seven level inverter with less number of clamping diodes which is suitable for regenerative loads such as three phase induction motor with regenerative braking. To reduce the stress across the main switches, diodes are clamped anti-parallel to the main switches. In Earlier configurations, the numbers of clamping diode...

  7. Renal biopsy in the elderly

    Directory of Open Access Journals (Sweden)

    Javier Robaina

    2016-09-01

    Full Text Available Introduction: Kidney disease is very common among the elderly. Over the last decades, the number of renal biopsies performed on these patients has increased. Objective: This study was carried out to examine the frequency and the clinical-pathological correlation of kidney disease in elderly patients who have had a renal biopsy done. Methods: The clinical presentation of kidney disease and the main histological findings were retrospectively analyzed in patients over 65 who had undergone renal biopsy (n=109 for a period of 12 years. Results: The total number of renal biopsies performed during this period was 871, out of which 109 (12.5% corresponded to patients over 65. The main indications for renal biopsies were nephrotic syndrome (37.6% and kidney failure (34.9%. Microscopic hematuria was found in 59.6% of the patients and high blood pressure in 62.4% of them. The most frequent histological diagnosis was membranous glomerulonephritis (21.1%, followed by extracapillary glomerulonephritis (20.2%. When clinical syndromes and histological findings were compared, the nephrotic syndrome was found to be the main feature of membranous nephropathy (78.3%, of focal segmental glomerulosclerosis (55.6% and of diabetic nephropathy (66.7%. Kidney failure was present in 90% of the cases of extracapillary glomerulonephritis (95.5% pauciimmune or type 3. Microscopic hematuria was the main sign of mesangial prolifeative glomerulonephritis (83.3%. Conclusions: Nephrotic syndrome and kidney failure (especially rapidly progressive renal failure were the main renal biopsy results in this group of patients, bearing close relation to histological findings. The most common types of glomerulonephritis were membranous GN and pauciimmune extracapillary GN. Renal biopsy provides useful information for the diagnosis, prognosis and treatment of kidney disease in the elderly.

  8. YIELD INDICATORS

    African Journals Online (AJOL)

    International Institute of Tropical Agriculture, East and Southern Africa, Centre, P.O. Box 7878,. Kampala, Uganda. Makerere ... would have great potential in terms of human nutrition. Storage root yield , the ... Inter-relationships among traits and path analysis for yield components of cassava. 604 collected included plant ...

  9. New active load voltage clamp for HF-link converters

    Energy Technology Data Exchange (ETDEWEB)

    Ljusev, P.; Andersen, M.A.E.

    2005-07-01

    This paper proposes a new active clamp for HF-link converters, which features very high efficiency by returning the clamped energy back to the primary side through a small auxiliary converter. It also increases the reliability of HF-link converters by providing an alternative load current path during malfunctions of the secondary bidirectional bridge. The feasibility of the approach is shown on audio power amplifier prototype. New integrated magnetics design is presented that incorporates both the main power and auxiliary transformer on the same magnetic core. (au)

  10. A new configuration for multilevel converters with diode clamped topology

    DEFF Research Database (Denmark)

    Nami, A.; Zare, F.; Ledwich, G.

    2008-01-01

    Due to the increased use of renewable energy and power elctronic applications, more multilevel converters (MLC) are developed. A Neutral Point Clamped (NPC) inverter is one of the most used multilevel topologies for wind turbine (WT) and photovoltaic (PV) applications. One of the most crucial...... points in this type of converter is dc-voltage control. In this paper, a novel multi output dc-dc converter connected to a diode clamped topology is presented. This converter, for a given duty cycles, is able to regulate the capacitor voltage to provide an appropriate input voltage for NPC regardless...

  11. Improved DNA clamps by stacking to adjacent nucleobases

    DEFF Research Database (Denmark)

    Fatthalla, M.I.; Pedersen, Erik Bjerregaard

    2012-01-01

    Three or four aromatic rings interconnected by acetylene bridges form a stiff conjugated system with sufficient conformational freedom to make it useful to link together the two strands of a DNA clamp. Upon targeting a ssDNA, the conformational flexibility allows better stacking of the linker...... to the underlying non-planar base triplet in the formed triplex. This type of triplexes has a substantially higher thermal melting temperature which can be further improved by inserting locked nucleic acids (LNAs) in the Hoogsteen part of the clamp. An extremely high sensitivity to mismatches is observed...

  12. The Utility of Endoscopic Biopsies in Patients with Normal Upper Endoscopy

    Directory of Open Access Journals (Sweden)

    Anouar Teriaky

    2016-01-01

    Full Text Available Background and Aims. Upper endoscopy is a valuable tool in the workup of gastrointestinal (GI complaints. The purpose of this study is to determine cost and yield of taking biopsies in a normal upper GI tract. Methods. This is a retrospective study where all upper GI biopsies were identified between May 2012 and April 2013, at a tertiary care center. Clinical, procedural, and pathology reports were reviewed to identify patient demographics, procedure information, and pathology diagnosis. Results. Biopsies of the upper GI tract were taken in 1297 patients with normal upper endoscopies. In patients with normal upper endoscopy, 22% of esophageal, 44% of gastric, and 12% of duodenal biopsies were abnormal. The most frequent abnormality was reflux esophagitis in 16% of esophageal biopsies, chronic gastritis in 23% of gastric biopsies, and increased intraepithelial lymphocytes in 6% of duodenal biopsies. The additional cost for taking biopsies in a normal upper GI tract for a diagnosis of eosinophilic esophagitis was $2963 Canadian (CAD, H. pylori associated gastritis was $1404 CAD, and celiac disease was $3024 CAD. Conclusions. The yield of biopsy in normal upper endoscopy varied with location, but the additional expense can be costly and should be tailored to appropriate clinical situations.

  13. Magnetic Resonance and Ultrasound Image Fusion Supported Transperineal Prostate Biopsy Using the Ginsburg Protocol: Technique, Learning Points, and Biopsy Results.

    Science.gov (United States)

    Hansen, Nienke; Patruno, Giulio; Wadhwa, Karan; Gaziev, Gabriele; Miano, Roberto; Barrett, Tristan; Gnanapragasam, Vincent; Doble, Andrew; Warren, Anne; Bratt, Ola; Kastner, Christof

    2016-08-01

    Prostate biopsy supported by transperineal image fusion has recently been developed as a new method to the improve accuracy of prostate cancer detection. To describe the Ginsburg protocol for transperineal prostate biopsy supported by multiparametric magnetic resonance imaging (mpMRI) and transrectal ultrasound (TRUS) image fusion, provide learning points for its application, and report biopsy results. The article is supplemented by a Surgery in Motion video. This single-centre retrospective outcome study included 534 patients from March 2012 to October 2015. A total of 107 had no previous prostate biopsy, 295 had benign TRUS-guided biopsies, and 159 were on active surveillance for low-risk cancer. A Likert scale reported mpMRI for suspicion of cancer from 1 (no suspicion) to 5 (cancer highly likely). Transperineal biopsies were obtained under general anaesthesia using BiopSee fusion software (Medcom, Darmstadt, Germany). All patients had systematic biopsies, two cores from each of 12 anatomic sectors. Likert 3-5 lesions were targeted with a further two cores per lesion. Any cancer and Gleason score 7-10 cancer on biopsy were noted. Descriptive statistics and positive predictive values (PPVs) and negative predictive values (NPVs) were calculated. The detection rate of Gleason score 7-10 cancer was similar across clinical groups. Likert scale 3-5 MRI lesions were reported in 378 (71%) of the patients. Cancer was detected in 249 (66%) and Gleason score 7-10 cancer was noted in 157 (42%) of these patients. PPV for detecting 7-10 cancer was 0.15 for Likert score 3, 0.43 for score 4, and 0.63 for score 5. NPV of Likert 1-2 findings was 0.87 for Gleason score 7-10 and 0.97 for Gleason score ≥4+3=7 cancer. Limitations include lack of data on complications. Transperineal prostate biopsy supported by MRI/TRUS image fusion using the Ginsburg protocol yielded high detection rates of Gleason score 7-10 cancer. Because the NPV for excluding Gleason score 7-10 cancer was very

  14. Utility of abdominal skin plus subcutaneous fat and rectal mucosal biopsy in the diagnosis of AL amyloidosis with renal involvement.

    Directory of Open Access Journals (Sweden)

    Ting Li

    Full Text Available Skin fat biopsy of the abdominal wall is a simple and safe method for detecting amyloidosis, and rectal mucosal biopsy is also frequently used for screening for the disease; however, the sensitivity of these approaches has not been fully studied. The aim of this study was to evaluate the efficacy of skin fat biopsy combined with rectal mucosal biopsy as a screening procedure for the diagnosis of systemic immunoglobulin light-chain (AL amyloidosis.We retrospectively analyzed 224 AL amyloidosis patients confirmed by renal biopsy, including a test group of 165 patients and validation group of 59 patients. Surgical skin fat biopsy from the abdominal wall and rectal mucosal biopsy under endoscopy was performed to obtain specimens. Congo red staining and immunofluorescence staining with antibodies against light chains were performed to type the disease. Pathology reports were reviewed to assess the diagnostic sensitivity of skin fat biopsy and rectal mucosal biopsy. Diagnostic specificity was not examined in the present study, because no healthy volunteers and only few patients with other diseases had performed immunofluorescence staining on skin fat and rectal specimens.Of the 165 patients in the test group, Congo red staining of skin fat and rectal mucosal specimens was associated with a sensitivity of 89.3% and 94.8%, respectively. The sensitivity increased to 98.9% by combining both biopsy methods. Immunofluorescence stains were positive in 81.1% of patients undergoing skin fat biopsy and 84.7% of patients undergoing rectal mucosal biopsy. Immunofluorescence stains yielded positive results in 86.7% of cases combining skin fat biopsy with rectal mucosal biopsy. The diagnostic results also performed well in the validation group.Surgical skin biopsy including the subcutaneous fat pad can be performed safely at the bedside and is useful for diagnosing AL amyloidosis. Combining skin fat biopsy with rectal mucosal biopsy may identify amyloid deposits in

  15. Computed tomography-guided percutaneous biopsy of pancreatic masses using pneumodissection

    Directory of Open Access Journals (Sweden)

    Chiang Jeng Tyng

    2013-06-01

    Full Text Available Objective To describe the technique of computed tomography-guided percutaneous biopsy of pancreatic tumors with pneumodissection. Materials and Methods In the period from June 2011 to May 2012, seven computed tomography-guided percutaneous biopsies of pancreatic tumors utilizing pneumodissection were performed in the authors' institution. All the procedures were performed with an automatic biopsy gun and coaxial system with Tru-core needles. The biopsy specimens were histologically assessed. Results In all the cases the pancreatic mass could not be directly approached by computed tomography without passing through major organs and structures. The injection of air allowed the displacement of adjacent structures and creation of a safe coaxial needle pathway toward the lesion. Biopsy was successfully performed in all the cases, yielding appropriate specimens for pathological analysis. Conclusion Pneumodissection is a safe, inexpensive and technically easy approach to perform percutaneous biopsy in selected cases where direct access to the pancreatic tumor is not feasible.

  16. Computed tomography-guided percutaneous biopsy of pancreatic masses using pneumodissection

    International Nuclear Information System (INIS)

    Tyng, Chiang Jeng; Bitencourt, Almir Galvao Vieira; Almeida, Maria Fernanda Arruda; Barbosa, Paula Nicole Vieira; Martins, Eduardo Bruno Lobato; Junior, Joao Paulo Kawaoka Matushita; Chojniak, Rubens; Coimbra, Felipe Jose Fernandez

    2013-01-01

    Objective: to describe the technique of computed tomography-guided percutaneous biopsy of pancreatic tumors with pneumodissection. Materials and methods: in the period from June 2011 to May 2012, seven computed tomography guided percutaneous biopsies of pancreatic tumors utilizing pneumodissection were performed in the authors' institution. All the procedures were performed with an automatic biopsy gun and coaxial system with Tru-core needles. The biopsy specimens were histologically assessed. Results: in all the cases the pancreatic mass could not be directly approached by computed tomography without passing through major organs and structures. The injection of air allowed the displacement of adjacent structures and creation of a safe coaxial needle pathway toward the lesion. Biopsy was successfully performed in all the cases, yielding appropriate specimens for pathological analysis. Conclusion: Pneumodissection is a safe, inexpensive and technically easy approach to perform percutaneous biopsy in selected cases where direct access to the pancreatic tumor is not feasible. (author)

  17. Initial results of selective renal parenchymal clamping with an adjustable kidney clamp in nephron-sparing surgery: an easy way to minimise renal ischaemia.

    Science.gov (United States)

    Cheng, K C; Yiu, M K; Ho, S H; Ng, T L; Tsu, H L; Ma, W K

    2016-12-01

    A renal parenchymal clamp has been used at our centre since March 2012. It is used in position over the kidney to achieve optimal vascular control of a tumour while minimising parenchymal ischaemia. This study aimed to report the feasibility, surgical outcome, and oncological control of a kidney clamp in partial nephrectomy. This study was conducted at a teaching hospital in Hong Kong. Partial nephrectomies performed from January 2009 to March 2015 were reviewed. The tumour characteristics and surgical outcomes of kidney clamp were studied and compared with traditional hilar clamping. A total of 92 patients were identified during the study period. Kidney clamps were used in 20 patients and hilar clamping in 72, with a mean follow-up of 27 and 37 months, respectively. For patients in whom a kidney clamp was applied, all tumours were exophytic to a different extent and the majority (90%) were located at the polar region. The PADUA (preoperative aspects and dimensions used for an anatomical) classification nephrometry score was also lower than those in whom hilar clamping was used (7.07 vs 8.34; P=0.002). The clamp was used in open, laparoscopic, and robot-assisted surgery. Operating time was shorter (207 ± 72 mins vs 306 ± 80 mins; Pkidney clamp. No acute kidney injury occurred. Postoperative renal function was comparable between the two groups. Partial nephrectomy using parenchymal clamping is safe and feasible in selected cases. The postoperative renal function and oncological control were satisfactory.

  18. CT-guided percutaneous spine biopsy in suspected infection or malignancy. A study of 214 patients

    International Nuclear Information System (INIS)

    Rehm, J.; Veith, S.; Kauczor, H.U.; Weber, M.A.; Akbar, M.

    2016-01-01

    To retrospectively determine the effectiveness and accuracy of CT-guided percutaneous biopsy of malignant and inflammatory bone lesions of the spine and to assess the reliability of pre-biopsy CT and MRI. 214 patients with lesions of the spine, which were suspicious either for being malignant or inflammatory, underwent CT-guided biopsy for pathological and/or microbiological detection. Biopsy samples were sent for histological examination in 128/214 patients, for microbiological analysis in 17/214 patients and for both analyses in 69/214 patients. Retrospectively, the diagnostic accuracy and sensitivity/specificity of the pre-interventional imaging (CT and MRI) were determined. In addition, the influence of the biopsy on subsequent patient management was assessed. The accuracy was 94.4% for histopathological analysis and 97.7% for microbiological analysis. In 25% of cases the microbiological analysis revealed an underlying pathogen that was not significantly affected by pre-biopsy antibiotic therapy. The sensitivity/specificity of the pre-biopsy cross-sectional imaging concerning suspected malignancy was 69%/78%. For suspected infection, the sensitivity/specificity of pre-biopsy imaging was 81%/44%. In 52% of all cases, the biopsy result changed subsequent patient management. Percutaneous CT-guided spine biopsy is a useful and reliable diagnostic procedure to establish a definitive diagnosis but with a relatively low yield of microorganisms in the case of infection.

  19. CT-guided percutaneous spine biopsy in suspected infection or malignancy. A study of 214 patients

    Energy Technology Data Exchange (ETDEWEB)

    Rehm, J.; Veith, S.; Kauczor, H.U.; Weber, M.A. [Heidelberg Univ. (Germany). Inst. of Diagnostic and Interventional Radiology; Akbar, M. [Heidelberg Univ. (Germany). Dept. of Orthopaedic Surgery and Rehabilitation Medicine

    2016-12-15

    To retrospectively determine the effectiveness and accuracy of CT-guided percutaneous biopsy of malignant and inflammatory bone lesions of the spine and to assess the reliability of pre-biopsy CT and MRI. 214 patients with lesions of the spine, which were suspicious either for being malignant or inflammatory, underwent CT-guided biopsy for pathological and/or microbiological detection. Biopsy samples were sent for histological examination in 128/214 patients, for microbiological analysis in 17/214 patients and for both analyses in 69/214 patients. Retrospectively, the diagnostic accuracy and sensitivity/specificity of the pre-interventional imaging (CT and MRI) were determined. In addition, the influence of the biopsy on subsequent patient management was assessed. The accuracy was 94.4% for histopathological analysis and 97.7% for microbiological analysis. In 25% of cases the microbiological analysis revealed an underlying pathogen that was not significantly affected by pre-biopsy antibiotic therapy. The sensitivity/specificity of the pre-biopsy cross-sectional imaging concerning suspected malignancy was 69%/78%. For suspected infection, the sensitivity/specificity of pre-biopsy imaging was 81%/44%. In 52% of all cases, the biopsy result changed subsequent patient management. Percutaneous CT-guided spine biopsy is a useful and reliable diagnostic procedure to establish a definitive diagnosis but with a relatively low yield of microorganisms in the case of infection.

  20. Management of Senile Ptosis with Levator Muscle Resection Using the Putterman Clamp

    Science.gov (United States)

    2016-01-01

    Summary: Putterman clamp, a muscle clamp, is commonly used in conjunctival müllerectomies. We report 3 cases of senile ptosis repaired with levator muscle resection using the Putterman clamp. The redundant levator aponeurosis was removed with electrocautery after clamping with the Putterman clamp. The levator muscle was refixed to the tarsus with three 4-0 Vicryl stitches after adjusting the height of the eyelid fissure. No intraoperative difficulties were encountered. Ecchymosis and edema were limited in the immediate postoperative period. No complications were noted during the follow-up. The benefits of using the Putterman clamp in levator muscle resection are illustrated in these cases. PMID:27482474

  1. Testicular biopsy in prepubertal boys

    DEFF Research Database (Denmark)

    Faure, Alice; Bouty, Aurore; O'Brien, Mike

    2016-01-01

    for the preservation of fertility after gonadotoxic chemotherapy - even for prepubertal boys - are emerging. Cryopreservation of testicular tissue samples for the preservation of fertility - although still an experimental method at present - is appealing in this context. In our opinion, testicular biopsy...

  2. Biopsy techniques for intraocular tumors

    Directory of Open Access Journals (Sweden)

    Pukhraj Rishi

    2016-01-01

    Full Text Available Biopsy involves the surgical removal of a tissue specimen for histopathologic evaluation. Most intraocular tumors are reliably diagnosed based on the clinical evaluation or with noninvasive diagnostic techniques. However, accurately diagnosing a small percentage of tumors can be challenging. A tissue biopsy is thus needed to establish a definitive diagnosis and plan the requisite treatment. From fine-needle aspiration biopsy (FNAB to surgical excision, all tissue collection techniques have been studied in the literature. Each technique has its indications and limitations. FNAB has been reported to provide for 88-95% reliable and safe ophthalmic tumor diagnosis and has gained popularity for prognostic purposes and providing eye conserving treatment surgeries. The technique and instrumentation for biopsy vary depending upon the tissue involved (retina, choroid, subretinal space, vitreous, and aqueous, suspected diagnosis, size, location, associated retinal detachment, and clarity of the media. The cytopathologist confers a very important role in diagnosis and their assistance plays a key role in managing and planning the treatment for malignancies.

  3. Gram stain of tissue biopsy

    Science.gov (United States)

    ... suspected. Normal Results Whether there are bacteria, and what type there are, depends on the tissue being biopsied. Some tissues in the body are ... about the meaning of your specific test results. What Abnormal Results Mean ... results usually mean there is an infection in the tissue. More tests, such as culturing the tissue that ...

  4. A piezoelectric vibration harvester based on clamped-guided beams

    NARCIS (Netherlands)

    Wang, Z.; Matova, S.; Elfrink, R.; Jambunathan, M.; Nooijer, C. de; Schaijk, R. van; Vullers, R.J.M.

    2012-01-01

    The paper addresses the design, modeling, fabrication and experimental results of a piezoelectric energy harvester based on clamped-guided beams. The design is featured by shorter mass displacement and higher reliability than cantilever beams. Two separate sets of capacitors allow exploiting both

  5. Pulsewidth-modulated 2-source neutral-point-clamped inverter

    DEFF Research Database (Denmark)

    Blaabjerg, Frede; Loh, Poh Chang; Gao, Feng

    2007-01-01

    This paper presents the careful integration of a newly proposed Z-source topological concept to the basic neutral-point-clamped (NPC) inverter topology for designing a three-level inverter with both voltage-buck and voltage-boost capabilities. The designed Z-source NPC inverter uses two unique X-...

  6. A clamp-like biohybrid catalyst for DNA oxidation

    NARCIS (Netherlands)

    van Dongen, S.F.M.; Clerx, J.; Norgaard, K.; Bloemberg, T.G.; Cornelissen, Jeroen Johannes Lambertus Maria; Trakselis, M.A.; Nelson, S.W.; Benkovic, S.J.; Rowan, A.E.; Nolte, R.J.M.

    2013-01-01

    In processive catalysis, a catalyst binds to a substrate and remains bound as it performs several consecutive reactions, as exemplified by DNA polymerases. Processivity is essential in nature and is often mediated by a clamp-like structure that physically tethers the catalyst to its (polymeric)

  7. analytical bending solution of all clamped isotropic rectangular plate

    African Journals Online (AJOL)

    HP

    is the plate flexural rigidity, is the Young's modulus of elasticity of the plate, is the uniformly distributed load, is the deflection, is the modulus of subgrade reaction, is the thickness of the plate and is the. Poisson's ratio of the plate. The independent co-ordinates, x and y, of the clamped plate can be expressed in the form of ...

  8. Beyond the patch clamp: nanotechnologies for intracellular recording.

    Science.gov (United States)

    Kruskal, Peter B; Jiang, Zhe; Gao, Teng; Lieber, Charles M

    2015-04-08

    The patch clamp is a fundamental tool for neuroscientists, offering insights that have shaped our understanding of the brain. Advances in nanotechnology suggest that the next generation of recording methods is now within reach. We discuss the complexity and future promise of applying nanoscience to neural recording. Copyright © 2015 Elsevier Inc. All rights reserved.

  9. Trans-Z-source Neutral Point Clamped inverter

    DEFF Research Database (Denmark)

    Mo, W.; Loh, P. C.; Li, D.

    2012-01-01

    for buck-boost energy conversion with all the favourable advantages of multi-level switching retained. This paper presents three-level trans-Z-source Neutral Point Clamped (NPC) inverter topology, which achieves both the advantages of trans-Z-source and three-level NPC inverter configuration. With proper...

  10. Pulsewidth Modulation of Neutral-Point-Clamped Indirect Matrix Converter

    DEFF Research Database (Denmark)

    Blaabjerg, Frede; Poh Chiang, Loh; Gao, Feng

    2008-01-01

    discussed in the existing literature. Addressing the previously described issues, this paper focuses on the operational mode analysis of a three-level indirect matrix converter implemented using a neutral-point-clamped inversion stage and the design of a number of PWM and modulation ratio compensation...

  11. Euglycemic clamp insulin sensitivity and longitudinal systolic blood pressure

    DEFF Research Database (Denmark)

    Petrie, John R; Malik, Muhammad Omar; Balkau, Beverley

    2013-01-01

    and Cardiovascular disease (RISC) study, we measured insulin sensitivity (M/I) using the euglycemic clamp technique in 1073 healthy European adults (587 women, 486 men) aged 30 to 60 years followed up 3 years later. Systolic BP (SBP) at baseline was higher in insulin-resistant women (ie, those in the low sex...

  12. Five-level Z-source diode-clamped inverter

    DEFF Research Database (Denmark)

    Gao, F.; Loh, Poh Chiang; Blaabjerg, Frede

    2010-01-01

    This study proposes a five-level Z-source diode-clamped inverter designed with two intermediate Z-source networks connected between the dc input sources and rear-end inverter circuitry. By partially shorting the Z-source networks, new operating states not previously reported for two-level Z...

  13. Magnetic Resonance Imaging-Ultrasound Fusion Biopsy During Prostate Cancer Active Surveillance.

    Science.gov (United States)

    Tran, Geraldine N; Leapman, Michael S; Nguyen, Hao G; Cowan, Janet E; Shinohara, Katsuto; Westphalen, Antonio C; Carroll, Peter R

    2017-08-01

    Fusion biopsy using multiparametric magnetic resonance imaging (MRI) and transrectal ultrasound has demonstrated favorable detection rates of high-grade prostate cancer (PCa) among previously undiagnosed men. However, the diagnostic yield among men with active surveillance (AS) remains undefined. To determine the utility of MRI-ultrasound fusion biopsy during AS by reporting rates of PCa upgrading and comparing findings with systematic biopsy. We identified patients with low- and intermediate-risk PCa enrolled in AS who received MRI-ultrasound fusion surveillance biopsies. All completed prostate multiparametric MRI with 3-T and endorectal coil reviewed by radiologists selecting regions of interest, and all underwent MRI-ultrasound fusion biopsy with concurrent systematic biopsy. We report MRI-ultrasound fusion biopsy findings, rates of Gleason score (GS) upgrading to ≥3 + 4 (any upgrading) and to ≥4 + 3 (major upgrading), tumor involvement estimates using descriptive statistics, McNemar's test of symmetry, and multivariate logistic regression. Overall, 207 men underwent MRI-ultrasound fusion biopsy following radiologic suspicion on multiparametric MRI and met inclusion criteria. Agreement between systematic and MRI-ultrasound fusion biopsy GS was borderline statistically significant (p<0.047). In total, 83 men (40%) experienced any upgrading, including 49 (24%) on systematic sampling, 30 (14%) on MRI-targeted cores, and four (2%) on both. Among those with negative results on MRI-ultrasound fusion biopsy, seven (9%) exhibited major upgrading with systematic biopsy. MRI suspicion scores were high (4/5) for all but two patients with any upgrading and for all who experienced major upgrading. On multivariate analysis, older age was associated with higher odds of any upgrading for men with GS ≤3 + 3 on previous biopsy (odds ratio: 1.10; 95% confidence interval, 1.01-1.20; p=0.03). MRI-ultrasound fusion biopsy resulted in upgrading otherwise undetected by systematic

  14. When to biopsy seminal vesicles.

    Science.gov (United States)

    Panach-Navarrete, J; García-Morata, F; Hernández-Medina, J A; Martínez-Jabaloyas, J M

    2015-05-01

    The involvement of seminal vesicles in prostate cancer can affect the prognosis and determine the treatment. The objective of this study was to determine whether we could predict its infiltration at the time of the prostate biopsy to know when to indicate the biopsy of the seminal vesicles. observational retrospective study of 466 patients who underwent seminal vesicle biopsy. The indication for this biopsy was a prostate-specific antigen (PSA) level greater than 10 ng/ml or an asymmetric or obliterated prostatoseminal angle. The following variables were included in the analysis: PSA level, PSA density, prostate volume, number of cores biopsied, suspicious rectal examination, and preservation of the prostatoseminal angle, studying its relationship with the involvement of the seminal vesicles. Forty-one patients (8.8%) had infiltrated seminal vesicles and 425 (91.2%) had no involvement. In the univariate analysis, the cases with infiltration had a higher mean PSA level (P 19.60 ng/dL (P < .01) and 2.95 times higher if there is a suspicious rectal examination (P = .014). Furthermore, this probability increases by 1.04 times for each unit of prostate volume lower (P < .01). The ROC curves showed maximum sensitivity and specificity at 19.6 ng/mL for PSA and 0.39 for PSA density. In this series, greater involvement of seminal vesicles was associated with a PSA level ≥20 ng/ml, a suspicious rectal examination and a lack of prostatoseminal angle preservation. Copyright © 2014 AEU. Publicado por Elsevier España, S.L.U. All rights reserved.

  15. Direct immunofluorescence of skin biopsy: Perspective of an immunopathologist

    Directory of Open Access Journals (Sweden)

    Minz Ranjana

    2010-01-01

    Full Text Available Background: By direct immunofluorescence (DIF, presence of immune complexes in the skin biopsy at various locations such as the dermo-epidermal junction, dermal blood vessels, etc. help to arrive at a diagnosis. Aims: (1 To study the role of DIF in confirmation or exclusion of diseases involving skin vis-à-vis histopathology and clinical diagnosis, (2 to describe the annual spectrum of dermatologic conditions that present to a tertiary referral center and require DIF examination of skin biopsy for confirmation of diagnosis. Methods: A total of 267 biopsies received over a period of 16 months in the Department of Immunopathology were analyzed along with clinical and histopathological details and the correlation between them was studied. Results: DIF was positive in 204 skin biopsies. Of these, 127 biopsies showed good clinico-immuno-histopathological correlation. In 10 cases, only DIF could clinch the diagnosis. In another nine cases, immune deposits were noted, which were unexpected in light of clinical and histopathological diagnosis. The most common skin involvement was seen in vasculitides. DIF was, however, non-contributory in lesions like erythema multiformè, post Kala-azar dermal leishmaniasis, sarcoidosis, lupus vulgaris, pyoderma gangrenosum and prurigo nodularis. Conclusion: The DIF of skin in conjunction with histopathology gives the best diagnostic yield. It is invaluable in confirming the diagnosis of small vessel vasculitides and bullous lesions of skin and can be used as an additional tool to pinpoint the diagnosis of systemic and localized autoimmune diseases involving the skin.

  16. Freehand biopsy guided by electromagnetic needle tracking

    DEFF Research Database (Denmark)

    Ewertsen, C; Nielsen, Marie Kristina Rue; Nielsen, M Bachmann

    2011-01-01

    To evaluate the overall accuracy and time spent on biopsy guided by electromagnetic needle tracking in a phantom compared with the standard technique of US-guided biopsy with an attached steering device. Furthermore, to evaluate off-plane biopsy guided by needle tracking.......To evaluate the overall accuracy and time spent on biopsy guided by electromagnetic needle tracking in a phantom compared with the standard technique of US-guided biopsy with an attached steering device. Furthermore, to evaluate off-plane biopsy guided by needle tracking....

  17. Testing of Diode-Clamping in an Inductive Pulsed Plasma Thruster Circuit

    Science.gov (United States)

    Toftul, Alexandra; Polzin, Kurt A.; Martin, Adam K.; Hudgins, Jerry L.

    2014-01-01

    Testing of a 5.5 kV silicon (Si) diode and 5.8 kV prototype silicon carbide (SiC) diode in an inductive pulsed plasma thruster (IPPT) circuit was performed to obtain a comparison of the resulting circuit recapture efficiency,eta(sub r), defined as the percentage of the initial charge energy remaining on the capacitor bank after the diode interrupts the current. The diode was placed in a pulsed circuit in series with a silicon controlled rectifier (SCR) switch, and the voltages across different components and current waveforms were collected over a range of capacitor charge voltages. Reverse recovery parameters, including turn-off time and peak reverse recovery current, were measured and capacitor voltage waveforms were used to determine the recapture efficiency for each case. The Si fast recovery diode in the circuit was shown to yield a recapture efficiency of up to 20% for the conditions tested, while the SiC diode further increased recapture efficiency to nearly 30%. The data presented show that fast recovery diodes operate on a timescale that permits them to clamp the discharge quickly after the first half cycle, supporting the idea that diode-clamping in IPPT circuit reduces energy dissipation that occurs after the first half cycle

  18. Impact of Early Release of the IVC Clamp from Different IVC Clamping Maneuvers on Changes in Hemodynamic Parameters in Living Donor Liver Transplantation.

    Science.gov (United States)

    Shih, Tsung-Hsiao; Huang, Chia-Jung; Chen, Chao-Long; Cheng, Kwok-Wai; Wu, Shao-Chun; Yang, Sheng-Chun; Juang, Sin-Ei; Lee, Ying-En; Jawan, Bruno; Wang, Chih-Hsien

    2015-09-06

    BACKGROUND The aim of this study was to evaluate the impact of different methods of inferior vena cava (IVC) clamping and release of the cross clamp on hemodynamic parameters of recipients during living donor liver transplantation. MATERIAL AND METHODS Ninety-six adult living donor liver transplantation patients were divided into 3 groups according to cross-clamp of the IVC for all the hepatic vein and portal vein reconstruction (G1), cross-clamp of the IVC only for hepatic vein reconstruction (G2), and side-clamp of the IVC for hepatic vein reconstruction (G3). In G2 and G2, the reconstructed hepatic vein was clamped instead of the IVC for portal vein reconstruction. The hemodynamic parameters among groups were compared by 1-way ANOVA and the complications in each group were compared using the Kruskal-Wallis test. RESULTS Changes in percentage of MAP and CO in G3 were significantly less than that of G1 and G2 for hepatic vein reconstruction. Hemodynamic parameters of G2 and G3 normalized to pre-clamped values during portal vein reconstruction, while the hemodynamics of G1 remained unstable. CONCLUSIONS Hemodynamic changes were less pronounced in LT with side-clamp of the inferior cava vein versus total cross-clamp. Early release of the IVC clamp minimized the hemodynamic changes. There were no differences in terms of outcome (morbidity and mortality).

  19. Review: The lord of the rings: Structure and mechanism of the sliding clamp loader.

    Science.gov (United States)

    Kelch, Brian A

    2016-08-01

    Sliding clamps are ring-shaped polymerase processivity factors that act as master regulators of cellular replication by coordinating multiple functions on DNA to ensure faithful transmission of genetic and epigenetic information. Dedicated AAA+ ATPase machines called clamp loaders actively place clamps on DNA, thereby governing clamp function by controlling when and where clamps are used. Clamp loaders are also important model systems for understanding the basic principles of AAA+ mechanism and function. After nearly 30 years of study, the ATP-dependent mechanism of opening and loading of clamps is now becoming clear. Here I review the structural and mechanistic aspects of the clamp loading process, as well as comment on questions that will be addressed by future studies. © 2016 Wiley Periodicals, Inc. Biopolymers 105: 532-546, 2016. © 2016 Wiley Periodicals, Inc.

  20. Patch-Clamp Recording from Human Induced Pluripotent Stem Cell-Derived Cardiomyocytes: Improving Action Potential Characteristics through Dynamic Clamp

    Science.gov (United States)

    Veerman, Christiaan C.; Zegers, Jan G.; Mengarelli, Isabella; Bezzina, Connie R.

    2017-01-01

    Human induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs) hold great promise for studying inherited cardiac arrhythmias and developing drug therapies to treat such arrhythmias. Unfortunately, until now, action potential (AP) measurements in hiPSC-CMs have been hampered by the virtual absence of the inward rectifier potassium current (IK1) in hiPSC-CMs, resulting in spontaneous activity and altered function of various depolarising and repolarising membrane currents. We assessed whether AP measurements in “ventricular-like” and “atrial-like” hiPSC-CMs could be improved through a simple, highly reproducible dynamic clamp approach to provide these cells with a substantial IK1 (computed in real time according to the actual membrane potential and injected through the patch-clamp pipette). APs were measured at 1 Hz using perforated patch-clamp methodology, both in control cells and in cells treated with all-trans retinoic acid (RA) during the differentiation process to increase the number of cells with atrial-like APs. RA-treated hiPSC-CMs displayed shorter APs than control hiPSC-CMs and this phenotype became more prominent upon addition of synthetic IK1 through dynamic clamp. Furthermore, the variability of several AP parameters decreased upon IK1 injection. Computer simulations with models of ventricular-like and atrial-like hiPSC-CMs demonstrated the importance of selecting an appropriate synthetic IK1. In conclusion, the dynamic clamp-based approach of IK1 injection has broad applicability for detailed AP measurements in hiPSC-CMs. PMID:28867785

  1. Patch-Clamp Recording from Human Induced Pluripotent Stem Cell-Derived Cardiomyocytes: Improving Action Potential Characteristics through Dynamic Clamp.

    Science.gov (United States)

    Verkerk, Arie O; Veerman, Christiaan C; Zegers, Jan G; Mengarelli, Isabella; Bezzina, Connie R; Wilders, Ronald

    2017-08-30

    Human induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs) hold great promise for studying inherited cardiac arrhythmias and developing drug therapies to treat such arrhythmias. Unfortunately, until now, action potential (AP) measurements in hiPSC-CMs have been hampered by the virtual absence of the inward rectifier potassium current ( I K1 ) in hiPSC-CMs, resulting in spontaneous activity and altered function of various depolarising and repolarising membrane currents. We assessed whether AP measurements in "ventricular-like" and "atrial-like" hiPSC-CMs could be improved through a simple, highly reproducible dynamic clamp approach to provide these cells with a substantial I K1 (computed in real time according to the actual membrane potential and injected through the patch-clamp pipette). APs were measured at 1 Hz using perforated patch-clamp methodology, both in control cells and in cells treated with all-trans retinoic acid (RA) during the differentiation process to increase the number of cells with atrial-like APs. RA-treated hiPSC-CMs displayed shorter APs than control hiPSC-CMs and this phenotype became more prominent upon addition of synthetic I K1 through dynamic clamp. Furthermore, the variability of several AP parameters decreased upon I K1 injection. Computer simulations with models of ventricular-like and atrial-like hiPSC-CMs demonstrated the importance of selecting an appropriate synthetic I K1 . In conclusion, the dynamic clamp-based approach of I K1 injection has broad applicability for detailed AP measurements in hiPSC-CMs.

  2. Biopsy

    Science.gov (United States)

    ... What is the FOD? Foundation Levels of Giving Governance By-Laws Committees Committee Service Conflict of Interest ... These are often done to remove a small growth and confirm its nature at the same time. ...

  3. Active energy recovery clamping circuit to improve the performance of power converters

    Science.gov (United States)

    Whitaker, Bret; Barkley, Adam

    2017-05-09

    A regenerative clamping circuit for a power converter using clamping diodes to transfer charge to a clamping capacitor and a regenerative converter to transfer charge out of the clamping capacitor back to the power supply input connection. The regenerative converter uses a switch connected to the midpoint of a series connected inductor and capacitor. The ends of the inductor and capacitor series are connected across the terminals of the power supply to be in parallel with the power supply.

  4. Ultrasound guided percutaneous fine needle aspiration biopsy ...

    African Journals Online (AJOL)

    2011-06-15

    )-guided percutaneous fine needle aspiration biopsy (PFNAB)/US-guided percutaneous needle core biopsy (PNCB) of abdominal lesions is efficacious in diagnosis, is helpful in treatment choice, to evaluate whether various ...

  5. Ultrasound guided percutaneous fine needle aspiration biopsy ...

    African Journals Online (AJOL)

    )-guided percutaneous fine needle aspiration biopsy (PFNAB)/US-guided percutaneous needle core biopsy (PNCB) of abdominal lesions is efficacious in diagnosis, is helpful in treatment choice, to evaluate whether various other investigations ...

  6. Are the days of closed pleural biopsy over? Yes

    Directory of Open Access Journals (Sweden)

    Dharmesh Patel

    2015-01-01

    Full Text Available In the modern management of pleural diseases, thoracoscopy has a clear advantage over closed pleural biopsy. By way of its high yield, both in malignant pleural disease and pleural Tuberculosis – the two commonest cause of undiagnosed pleural effusion, thoracoscopy has the added advantage of faster symptom relief and offering effective pleurodesis. This makes it an attractive diagnostic and therapeutic procedure of choice and features high in the algorithms of many international guidelines on the approach to pleural diseases.

  7. Four- year thyroidectomy procedures: Ligasure Vs. clamp & tie

    Directory of Open Access Journals (Sweden)

    Pazoki AR

    2010-01-01

    Full Text Available "n Normal 0 false false false EN-US X-NONE AR-SA MicrosoftInternetExplorer4 /* 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:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; 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:Arial; mso-bidi-theme-font:minor-bidi;} Background: The electrothermal bipolar vessel sealing system is an adjunct to the hemostatic technique, which has been successfully used in many abdominal operation, recently made available to thyroid surgery. The purpose of this was compare the outcomes of new hemostatic technique with traditional method of clamp and tie."n"nMethods: In this retrospective cross-sectional study has been done in surgery's wards of Milad & Rasul- Akram hospitals in Tehran, Iran. During three- year period between 2005-2008 all patients with different kind of pathology that need operation were assessed. Time duration of surgery and hospital stay and post surgery complication in two group, ligasure (n=45 and clamp & tie (n=145 were compared with each others."n"nResults: No difference was seen between two groups in time duration of surgery. Significant difference was seen in hospital stay and complications of surgery. Time of operation in Ligasure group was 132/22 minute and in clamp and tie group was 130/10 minute. There was found significant difference in duration of hospital stay and postoperative complication. Hypocalcemia were seen in two and 24 cases in Ligasure and Clamp & Tie group, respectively (p<0.05. Hospital stay was 2

  8. The clinical utility of multimodal MR image-guided needle biopsy in cerebral gliomas.

    Science.gov (United States)

    Yao, Chengjun; Lv, Shunzeng; Chen, Hong; Tang, Weijun; Guo, Jun; Zhuang, Dongxiao; Chrisochoides, Nikos; Wu, Jinsong; Mao, Ying; Zhou, Liangfu

    2016-01-01

    Our aim was to evaluate the diagnostic value of multimodal Magnetic Resonance (MR) Image in the stereotactic biopsy of cerebral gliomas, and investigate its implications. Twenty-four patients with cerebral gliomas underwent (1)H Magnetic Resonance Spectroscopy ((1)H-MRS)- and intraoperative Magnetic Resonance Imaging (iMRI)-supported stereotactic biopsy, and 23 patients underwent only the preoperative MRI-guided biopsy. The diagnostic yield, morbidity and mortality rates were analyzed. In addition, 20 patients underwent subsequent tumor resection, thus the diagnostic accuracy of the biopsy was further evaluated. The diagnostic accuracies of biopsies evaluated by tumor resection in the trial groups were better than control groups (92.3% and 42.9%, respectively, p = 0.031). The diagnostic yield in the trial groups was better than the control groups, but the difference was not statistically significant (100% and 82.6%, respectively, p = 0.05). The morbidity and mortality rates were similar in both groups. Multimodal MR image-guided glioma biopsy is practical and valuable. This technique can increase the diagnostic accuracy in the stereotactic biopsy of cerebral gliomas. Besides, it is likely to increase the diagnostic yield but requires further validation.

  9. Aortography following subdiaphragmal aortic biopsy

    International Nuclear Information System (INIS)

    Schimmler, J.

    1982-01-01

    A juxtaposition of the subdiaphragmal and infrarenal translumbar aortic biopsy sites showed decisive advantages in favour of the higher site: a more stable position because of better anatomic fixation and rarer incidence of vascular alterations, a wider vascular lumen. Disadvantages lie in the fact that the large visceral arteries (especially Tr. coeliacus) branch off nearly and in the close anatomic relationship to large abdominal organs and the thoracal region. Evaluation of the radiographical image of the vascular tree after subdiaphragmal aortic biopsy showed an average 82% of the vessels to the area of the Knees to be assessable (renal arteries approximately 93%, popliteal arteries approximately 70%). Beyong, the method proved unsatisfactory: 52% of the vessels could not, or not safety, be evaluated. A relatively broad spectrum of indications by comparison with transfemoral catheter aortography had no influence on the rate of complications with reference to either method. A comparison of the topographic conditions shows the need for even more scrupulons observation of the technique in subdiaphragmal biopsy than in the infrarenal one. To sum up the results obtained, subdiaphregmal translumbar aortography is to be preferred to the infrarenal one where transfemoral catheter aortography is contra-indicated, within the limits mentioned. (orig.) [de

  10. Pressure controlled clamp using shape memory alloy for minimal vessel invasion in blood flow occlusion.

    Science.gov (United States)

    Zhang, Ye; Kanetaka, Hiroyasu; Sano, Yuya; Kano, Mitsuhiro; Kudo, Tadaaki; Sato, Takumi; Shimizu, Yoshinaka

    2013-01-01

    Vessel damage after clamping may affect the success of surgical operations. A new pressure controlled clamp (SMA clamp) was designed using super elastic property of shape memory alloy (SMA) to realize atraumatic vessel occlusion. The ability and biological effect of the SMA clamp to control pressure was investigated in vivo. The loading-displacement curves of the SMA clamps (experimental group) and conventional clamp (control group) by occlusion of pig carotid arteries were evaluated using a clamping-pressure analyzing system. To investigate macroscopically and histologically the vessel damage of the SMA and conventional clamps, pig carotid arteries were stained with Evan's blue and its histological sections were stained with Elastica Massion after clamping for fifteen minutes. Constant value was shown in the loading-displacement curve of SMA clamp. In the control group, damaged area stained with Evan's blue in the vessel wall showed enlargement with the pressure increasing. Less areas in experimental groups are observed than that in the control group. Histological section in the experimental group showed no obvious except a slight compressive damage in the tunica intima. In the control group, vessel wall showed irreversible damages. This experiment indicated that the SMA clamp, which has a unique mechanical property, can be used without vessels damage. This pressure controlled clamp can be a selection in clinical apparatus to improve surgical safety.

  11. Mega-granuloma After Using the Universal Clamp for Adolescent Idiopathic Scoliosis: What Is It and Can It Be Prevented?

    Science.gov (United States)

    Bailey, Richard Anthony; Duncan, Jan William; Tran, Alan T; Abraham, Jerrold L

    2014-09-01

    Clinical case series. To characterize the postoperative course and histopathology of peri-implant tissue of adolescent idiopathic scoliosis patients who experienced postoperative development of an aseptic soft tissue reaction, with granulomas adjacent to the sublaminar polyethylene terephthalate strap-titanium clamp used in Zimmer's Universal Clamp (UC) spinal fixation system after spinal surgery. The UC was designed for use with spinal deformity procedures in place of pedicle screws, hooks, or sublaminar wiring in fusion constructs. Recent studies of the UC lack emphasis on implant-related postoperative complications. A total of 26 consecutive patients who underwent spinal deformity correction for scoliosis were reviewed for implant-related postoperative complications. Histology, scanning electron microscopy with energy-dispersive X-ray spectroscopy, fractional culture/biopsy, and Gram stain examination of the peri-implant tissue of patients with complications was performed. The authors reviewed 26 cases for correction of scoliosis. Two patients with adolescent idiopathic scoliosis who used the UC experienced implant-related complications with development of an aseptic soft tissue reaction with granulomas adjacent to the sublaminar polyethylene terephthalate straps-titanium clamp mechanism of the UC 8 months after AIS correction surgery. There were no signs or symptoms of wound infection. Gram stain revealed no organisms. There were many neutrophils and the surface of the wound revealed rare Staphylococcus aureus but the deep portions of the wounds were negative for organisms. Histopathology revealed extensive granulation tissue and histiocytes with engulfed birefringent particles or debris, and scanning electron microscopy with energy-dispersive X-ray spectroscopy analysis revealed macrophages containing many particles identified as titanium. adolescent idiopathic scoliosis patients who use the novel UC construct may develop postoperative foreign-body reaction

  12. 20 CFR 718.106 - Autopsy; biopsy.

    Science.gov (United States)

    2010-04-01

    ... 20 Employees' Benefits 3 2010-04-01 2010-04-01 false Autopsy; biopsy. 718.106 Section 718.106... PNEUMOCONIOSIS Criteria for the Development of Medical Evidence § 718.106 Autopsy; biopsy. (a) A report of an autopsy or biopsy submitted in connection with a claim shall include a detailed gross macroscopic and...

  13. Breast magnetic resonance imaging guided biopsy

    Energy Technology Data Exchange (ETDEWEB)

    Yun, Bo La; Kim, Sun Mi; Jang, Mi Jung [Dept. of Radiology, Seoul National University Bundang Hospital, Seongnam (Korea, Republic of); Cho, Nariya; Moon, Woo Kyung [Dept. of Radiology, Seoul National University Hospital, Seoul (Korea, Republic of); Kim, Hak Hee [Dept. of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul (Korea, Republic of)

    2016-06-15

    Despite the high sensitivity of breast magnetic resonance imaging (MRI), pathologic confirmation by biopsy is essential because of limited specificity. MRI-guided biopsy is required in patients with lesions only seen on MRI. We review preprocedural considerations and the technique of MRI-guided biopsy, challenging situations and trouble-shooting, and correlation of radiologic and pathologic findings.

  14. Freehand biopsy guided by electromagnetic needle tracking

    DEFF Research Database (Denmark)

    Ewertsen, C; Nielsen, Marie Kristina Rue; Nielsen, M Bachmann

    2011-01-01

    To evaluate the overall accuracy and time spent on biopsy guided by electromagnetic needle tracking in a phantom compared with the standard technique of US-guided biopsy with an attached steering device. Furthermore, to evaluate off-plane biopsy guided by needle tracking....

  15. Gigaseal formation in patch clamping with applications of nanotechnology

    CERN Document Server

    Malboubi, Majid

    2014-01-01

    This book presents an investigation of gigaseal formation using micro/nanotechnology. The aims of the book are twofold. First, it explains the mechanisms of gigaseal formation using the latest discoveries. Second, it provides practical techniques for frequent formation of high resistance seals. The formation of a high-resistance electrical seal, also known as a gigaseal, between a cell membrane and a glass micropipette tip is essential in patch-clamp experiments. Even though four decades have passed since the introduction of the patch-clamping technique by Neher and Sakmann, gigaseal formation remains an obstacle in developing the high-throughput ion channel screening systems required by the pharmaceutical industry. Here the authors share their latest methods for achieving gigaseal formation and describe techniques that are highly desirable at both research and industrial levels. Nanotechnology has been found to be a powerful tool for studying and modifying glass micropipettes and in tackling the problem of g...

  16. Patch Clamp Experiments under Conditions of Variable Graviy

    Science.gov (United States)

    Kohn, F. P. M.; Meissner, K.

    2013-02-01

    The cellular membrane is an intrinsic part of any cell. It has a complex composition of lipid molecules and proteins. The membrane is, among others, involved in excitation and signal transduction. Ion channels, as integral membrane proteins, play an important role. For the question of gravity sensitivity of biological systems, especially neuronal cells, ion channels are of high interest. Gravity might directly interact with the ion channel protein or it might change the thermodynamic membrane parameters, influencing the incorporated proteins indirectly. Detailed information about the effects of gravity on the function of single ion-channels can up to now only be acquired by electrophysiological approaches like the patch clamp technique. Today this technique is the preferentially used technique for single ion-channel studies. Consequently, experiments have been developed in recent years to investigate the interaction of gravity with single ion channel molecules utilizing the patch-clamp technology on different macro- and micro-gravity platforms.

  17. Accessible or Inaccessible? Diagnostic Efficacy of CT-Guided Core Biopsies of Head and Neck Masses

    Energy Technology Data Exchange (ETDEWEB)

    Cunningham, Jane D., E-mail: janecunningham0708@gmail.com; McCusker, Mark W.; Power, Sarah; PearlyTi, Joanna; Thornton, John; Brennan, Paul; Lee, Michael J.; O’Hare, Alan; Looby, Seamus [Beaumont Hospital, Department of Radiology (Ireland)

    2015-04-15

    PurposeTissue sampling of lesions in the head and neck is challenging due to complex regional anatomy and sometimes necessitates open surgical biopsy. However, many patients are poor surgical candidates due to comorbidity. Thus, we evaluated the use of CT guidance for establishing histopathological diagnosis of head and neck masses.MethodsAll consecutive patients (n = 22) who underwent CT-guided core biopsy of head or neck masses between April 2009 and August 2012 were retrospectively reviewed using the departmental CT interventional procedures database. The indication for each biopsy performed was to establish or exclude a diagnosis of neoplasia in patients with suspicious head or neck lesions found on clinical examination or imaging studies. Patients received conscious sedation and 18 G, semiautomated core needle biopsies were performed by experienced neuroradiologists using 16-slice multidetector row CT imaging guidance (Somatom Definition Siemens Medical Solutions, Germany). Histopathology results of each biopsy were analysed.ResultsSixteen of 22 biopsies that were performed (73 %) yielded a pathological diagnosis. Anatomic locations biopsied included: masticator (n = 7), parapharyngeal (n = 3), parotid (n = 3), carotid (n = 3), perivertebral (n = 3), pharyngeal (n = 2), and retropharyngeal (n = 1) spaces. Six biopsies (27 %) were nondiagnostic due to inadequate tissue sampling, particularly small biopsy sample size and failure to biopsy the true sampling site due to extensive necrosis. No major complications were encountered.ConclusionsThe use of CT guidance to perform core biopsies of head and neck masses is an effective means of establishing histopathological diagnosis and reduces the need for diagnostic open surgical biopsy and general anaesthesia.

  18. Analysis of the Pallet Clamping Conditions in Work Positioning

    OpenAIRE

    L. A. Kolesnikov

    2016-01-01

    Pallets of automatic transfer lines serve as the technological and work-transfer equipment. However, their design is based on the general principles of designing machine accessories. Calculation of the basic design parameters of work based on their functioning features is fairly relevant.In pallet transfer movement over work positioning there is a mismatch between axes of the basic bushing of a pallet and the clamping locks of positioning. The paper identifies the factors influencing it, and ...

  19. Safety and utility of image-guided research biopsies in relapsed high-grade serous ovarian carcinoma-experience of the BriTROC consortium.

    Science.gov (United States)

    Goranova, T; Ennis, D; Piskorz, A M; Macintyre, G; Lewsley, L A; Stobo, J; Wilson, C; Kay, D; Glasspool, R M; Lockley, M; Brockbank, E; Montes, A; Walther, A; Sundar, S; Edmondson, R; Hall, G D; Clamp, A; Gourley, C; Hall, M; Fotopoulou, C; Gabra, H; Freeman, S; Moore, L; Jimenez-Linan, M; Paul, J; Brenton, J D; McNeish, I A

    2017-05-09

    Investigating tumour evolution and acquired chemotherapy resistance requires analysis of sequential tumour material. We describe the feasibility of obtaining research biopsies in women with relapsed ovarian high-grade serous carcinoma (HGSC). Women with relapsed ovarian HGSC underwent either image-guided biopsy or intra-operative biopsy during secondary debulking, and samples were fixed in methanol-based fixative. Tagged-amplicon sequencing was performed on biopsy DNA. We screened 519 patients in order to enrol 220. Two hundred and two patients underwent successful biopsy, 118 of which were image-guided. There were 22 study-related adverse events (AE) in the image-guided biopsies, all grades 1 and 2; pain was the commonest AE. There were pre-specified significant AE in 3/118 biopsies (2.5%). 87% biopsies were fit-for-purpose for genomic analyses. Median DNA yield was 2.87 μg, and was higher in biopsies utilising 14 G or 16 G needles compared to 18 G. TP53 mutations were identified in 94.4% patients. Obtaining tumour biopsies for research in relapsed HGSC is safe and feasible. Adverse events are rare. The large majority of biopsies yield sufficient DNA for genomic analyses-we recommend use of larger gauge needles and methanol fixation for such biopsies, as DNA yields are higher but with no increase in AEs.

  20. Role of the Checkpoint Clamp in DNA Damage Response

    Directory of Open Access Journals (Sweden)

    Mihoko Kai

    2013-01-01

    Full Text Available DNA damage occurs during DNA replication, spontaneous chemical reactions, and assaults by external or metabolism-derived agents. Therefore, all living cells must constantly contend with DNA damage. Cells protect themselves from these genotoxic stresses by activating the DNA damage checkpoint and DNA repair pathways. Coordination of these pathways requires tight regulation in order to prevent genomic instability. The checkpoint clamp complex consists of Rad9, Rad1 and Hus1 proteins, and is often called the 9-1-1 complex. This PCNA (proliferating cell nuclear antigen-like donut-shaped protein complex is a checkpoint sensor protein that is recruited to DNA damage sites during the early stage of the response, and is required for checkpoint activation. As PCNA is required for multiple pathways of DNA metabolism, the checkpoint clamp has also been implicated in direct roles in DNA repair, as well as in coordination of the pathways. Here we discuss roles of the checkpoint clamp in DNA damage response (DDR.

  1. The optimal sequence for bronchial brushing and forceps biopsy in lung cancer diagnosis: a random control study.

    Science.gov (United States)

    Hou, Gang; Miao, Yuan; Hu, Xue-Jun; Wang, Wei; Wang, Qiu-Yue; Wu, Guang-Ping; Wang, En-Hua; Kang, Jian

    2016-03-01

    Optimizing basic techniques in diagnostic bronchoscopy is important for improving medical services in developing countries. In this study, the optimal sequence of bronchial brushing relative to bronchial biopsy for lung cancer diagnosis was evaluated. A total of 420 patients with visible endobronchial tumors were prospectively and randomly enrolled in two groups: a pre-biopsy brushing group, receiving two brushings before biopsy; two brushings which performed afterwards; were set as self-control and compared with the pre-biopsy brushings as the intra-group comparison; and a post-biopsy brushing group, only receiving two brushings after biopsy, which were compared with the pre-biopsy brushings as the inter-group comparison. Diagnostic yield of brushing was compared before and after biopsy, and as well as for different tumor pathologies and bronchoscopic morphologies. The occurrence of treated bleeding which defined as bleeding needed further intervention with argon plasma coagulation and/or anti-coagulation drugs in two groups was also compared. Only patients with a definitive cytological or histological diagnosis of lung cancer based on bronchoscopy or other confirmatory techniques were included. Patients were excluded if they had submucosal lesions, extrinsic compressions, pulmonary metastasis of extrapulmonary malignancies or uncommon non-small cell lung carcinoma (NSCLC). A total of 362 patients who met the inclusion criteria were analyzed. Diagnostic yield for pre-biopsy brushing (49.2%, 88/179) was significantly higher than for post-biopsy brushing within the same pre-biopsy brushing group (31.8%, 57/179) (P=0.007) as the intra-group comparison, and significantly higher than for post-biopsy brushing in the post group (30.6%, 56/183) (Pcancer. In cases of endobronchial exophytic tumors, pre-biopsy brushing appears to be superior to post-biopsy brushing.

  2. Experience with full-thickness rectal biopsy in the evaluation of ...

    African Journals Online (AJOL)

    meconium was present in 64.7%, constipation in 85.7%, abdominal distension in 88.6%, and bilious vomiting in. 55.9%. Thirty biopsies (83.3%) yielded a histologic diagnosis. Twenty-six (72.2%) confirmed HD, whereas four. (11.1%) yielded normal rectal histology. In six (16.7%), the sample taken was deemed inadequate ...

  3. Cost-effectiveness of MR Imaging-guided Strategies for Detection of Prostate Cancer in Biopsy-Naive Men.

    Science.gov (United States)

    Pahwa, Shivani; Schiltz, Nicholas K; Ponsky, Lee E; Lu, Ziang; Griswold, Mark A; Gulani, Vikas

    2017-10-01

    Purpose To evaluate the cost-effectiveness of multiparametric diagnostic magnetic resonance (MR) imaging examination followed by MR imaging-guided biopsy strategies in the detection of prostate cancer in biopsy-naive men presenting with clinical suspicion of cancer for the first time. Materials and Methods A decision-analysis model was created for biopsy-naive men who had been recommended for prostate biopsy on the basis of abnormal digital rectal examination results or elevated prostate-specific antigen levels (age groups: 41-50 years, 51-60 years, and 61-70 years). The following three major strategies were evaluated: (a) standard transrectal ultrasonography (US)-guided biopsy; (b) diagnostic MR imaging followed by MR imaging-targeted biopsy, with no biopsy performed if MR imaging findings were negative; and (c) diagnostic MR imaging followed by MR imaging-targeted biopsy, with a standard biopsy performed when MR imaging findings were negative. The following three MR imaging-guided biopsy strategies were further evaluated in each MR imaging category: (a) biopsy with cognitive guidance, (b) biopsy with MR imaging/US fusion guidance, and (c) in-gantry MR imaging-guided biopsy. Model parameters were derived from the literature. The primary outcome measure was net health benefit (NHB), which was measured as quality-adjusted life-years (QALYs) gained or lost by investing resources in a new strategy compared with a standard strategy at a willingness-to-pay (WTP) threshold of $50 000 per QALY gained. Probabilistic sensitivity analysis was performed by using Monte Carlo simulations. Results Noncontrast MR imaging followed by cognitively guided MR biopsy (no standard biopsy if MR imaging findings were negative) was the most cost-effective approach, yielding an additional NHB of 0.198 QALY compared with the standard biopsy approach. Noncontrast MR imaging followed by in-gantry MR imaging-guided biopsy (no standard biopsy if MR imaging findings were negative) led to the

  4. Elevation of serum insulin concentration during euglycemic hyperinsulinemic clamp studies leads to similar activation of insulin receptor kinase in skeletal muscle of subjects with and without NIDDM

    DEFF Research Database (Denmark)

    Klein, H H; Vestergaard, H; Kotzke, G

    1995-01-01

    The role of skeletal muscle insulin receptor kinase in the pathogenesis of non-insulin-dependent diabetes mellitus (NIDDM) was investigated. Muscle biopsies from 13 patients with NIDDM and 10 control subjects at fasting serum insulin concentrations and approximately 1,000 pmol/l steady-state serum...... insulin during euglycemic hyperinsulinemic clamps were immediately frozen. The biopsies were then solubilized, and the receptors were immobilized to anti-insulin receptor antibody-coated microwells. Receptor kinase and binding activities were consecutively measured in these wells. The increase in serum...... and control groups, respectively). Moreover, by selecting only the receptors that bound to anti-phosphotyrosine antibody, we found similar hyperinsulinemia-induced increases of this receptor fraction and its kinase activity in both study groups. In vitro activation of the immobilized receptors with 2 mmol...

  5. Investigation of the Dynamics of a Clamped-Clamped Microbeam Near the Third Mode Using a Partial Electrode

    KAUST Repository

    Masri, Karim M.

    2014-08-17

    We present an investigation of the dynamics of a clamped-clamped microbeam excited electrostatically near its third mode. To maximize the response at the third mode, a partial electrode configuration is utilized. A multi-mode Galerkin method is used to develop a reduced order model (ROM) of the beam. A shooting method to find the periodic motion is utilized to generate frequency response curves. The curves show hardenining behavior and dynamic pull-in. We show that the dynamic amplitude of the partial configuration is higher than that of a full electrode configuration. These results are promising for the use of higher-order modes for mass detection and for ultra sensitive resonant sensors.

  6. Tissue Biopsies in Diabetes Research

    DEFF Research Database (Denmark)

    Højlund, Kurt; Gaster, Michael; Beck-Nielsen, Henning

    2007-01-01

    Type 2 diabetes is characterized by insulin resistance in major metabolic tissues such as skeletal muscle, liver and fat cells, and failure of the pancreatic ß-cells to compensate for this abnormality (1,2). Skeletal muscle is the major site of glucose disposal in response to insulin, and insulin....... Together with morphological studies, measurement of energy stores and metabolites, enzyme activity and phosphorylation, gene and protein expression in skeletal muscle biopsies have revealed a variety of cellular abnormalities in patients with type 2 diabetes and prediabetes. The possibility to establish...

  7. Tissue Biopsies in Diabetes Research

    DEFF Research Database (Denmark)

    Højlund, Kurt; Gaster, Michael; Beck-Nielsen, Henning

    2007-01-01

    Type 2 diabetes is characterized by insulin resistance in major metabolic tissues such as skeletal muscle, liver and fat cells, and failure of the pancreatic ß-cells to compensate for this abnormality (1,2). Skeletal muscle is the major site of glucose disposal in response to insulin, and insulin...... description of the technique of percutaneous needle biopsy of skeletal muscle and the establishment of human muscle cell cultures together with a discussion of advantages and limitations of the methods in diabetes research...

  8. Microsurgical Hepatic Artery Reconstruction Using Ikuta A-II Double Clamp.

    Science.gov (United States)

    Okochi, Masayuki; Okochi, Hiromi; Sakaba, Takao; Momiyama, Masanori; Ueda, Kazuki

    2017-05-01

    We performed hepatic artery (HA) reconstruction on 24 patients between January 2010 and October 2016. Six of 24 patients used an Ikuta type A-II vascular clamp (A-II group). The mean age was 38.0 years (range, 1-61 years). There was no blood leakage at the anastomosed site in any of the patients. No patients required an additional vascular clamp, and none developed HA thrombosis. Eighteen of 24 patients used a conventional vascular clamp. The mean age was 36.1 years (range, 1-65 years; conventional group). Sixteen of 18 patients required an additional vascular clamp due to blood leakage from the HA. There was no significant difference between the 2 groups in mean age or diameter of the recipient HA. However, there was a significant difference in the proportion of patients who required an additional vascular clamp (n clamp is an effective vascular clamp for reconstruction of the HA in living donor liver transplantation.

  9. MR and CT Imaging to Optimize CT-Guided Biopsies in Suspected Spondylodiscitis.

    Science.gov (United States)

    Foreman, Sarah C; Schwaiger, Benedikt J; Gempt, Jens; Jungmann, Pia M; Kehl, Victoria; Delbridge, Claire; Wantia, Nina; Zimmer, Claus; Kirschke, Jan S

    2017-03-01

    The diagnostic value of computed tomography (CT)-guided spinal biopsy in patients with suspected spondylodiscitis is reported inconsistently in the literature. Our aim was to evaluate associations between procedural, clinical, and imaging parameters and the diagnostic yield of CT-guided spinal biopsy. One hundred and two procedures performed in 87 patients with clinically suggested spondylodiscitis were analyzed retrospectively. Preprocedural magnetic resonance (MR) and CT images were evaluated regarding signal alterations, vertebral destruction, and soft-tissue involvement. The position of the biopsy needle in correlation with MR imaging findings was assessed. Patient characteristics and clinical details were noted. Parameters were compared in patients with positive and negative microbiological and histologic results. Following microbiologic and histologic analysis, infectious spondylodiscitis was diagnosed in 29 and 23 biopsies, respectively. Microbiology results were significantly higher in biopsy specimens with central needle positioning within contrast enhancing tissue in correlation with the MR images (36% vs. 7%; P = 0.005). Biopsy specimens positioned in fluid-equivalent hyperintense discs in T2-weighted sequences yielded significantly lower microbiology results (6% vs. 33%; P = 0.036). Purely lytic endplate destruction and mixed vertebral density as shown by CT increased microbiology results (60% vs. 24%; P = 0.028). Previous antibiotic treatment for any cause did not influence microbiology yields significantly (P = 0.232). MR imaging is mandatory to determine the optimal biopsy position. No clinical or imaging parameter could rule out a positive biopsy result and thus omit an unnecessary procedure. Biopsy should not be avoided if antibiotic treatment has previously been administered. Copyright © 2016 Elsevier Inc. All rights reserved.

  10. Transjugular Renal Biopsy: Our Experience and Technical Considerations

    International Nuclear Information System (INIS)

    See, Teik Choon; Thompson, Barbara C.; Howie, Alexander J.; Karamshi, M.; Papadopoulou, Anthie M.; Davies, Neil; Tibballs, Jonathan

    2008-01-01

    The purpose of this study was to describe the indications for and technique of transjugular renal biopsy (TJRB) and evaluate the efficacy and complications of this method. We performed a retrospective review of 59 patients who underwent TJRB using the Quick-core needle biopsy system (Cook, Letchworth, UK) over a 4-year period. The indications for obtaining renal biopsy included acute renal failure, chronic renal failure, nephrotic syndrome, and proteinuria with or without other associated disease. Indications for the transjugular approach included coagulopathy, biopsy of a solitary kidney or essentially single functioning kidney, simultaneous renal and hepatic biopsy, morbid obesity, and failed percutaneous biopsy. All but four cases were performed via the right internal jugular vein. The right, left, or both renal veins were cannulated in 41, 14, and 4 cases, respectively. Combined liver and renal biopsies were obtained in seven cases. Diagnostic biopsy specimens were obtained in 56 of 59 patients (95%). The number and size of tissue cores ranged from 1 to 9 mm and from 1 to 20 mm, respectively. The mean numbers of glomeruli per procedure on light microscopy and electron microscopy were 10.3 and 2.6, respectively. Specimens for immunohistology were acquired in 49 cases, of which 40 were adequate. Of the 56 successful TJRB procedures, 34 (61%) were associated with isolated capsular perforation (19), contained subcapsular leak (10), isolated collecting system puncture (1), and concurrent collecting system and capsular perforation (4). There was a significant increase in capsular perforation with six or more needle passes, although no significant correlation was seen between number of needle passes and complication. Six patients had minor complications defined as hematuria or loin pain. Seven patients developed major complications, of whom five received blood transfusion alone. Two required intervention: in one an arteriocalyceal fistula was embolized and the patient

  11. Umbilical cord clamping at birth--practice in Norwegian maternity wards.

    Science.gov (United States)

    Lundberg, Camilla; Øian, Pål; Klingenberg, Claus

    2013-11-26

    The timing and practice used for umbilical cord clamping of neonates are controversial internationally as well as in Norway. We therefore wished to investigate routines and practices for umbilical cord clamping of neonates in Norway. A web-based questionnaire was sent to heads of departments of all maternity wards in Norway (n = 52). They were asked about their practice with regard to umbilical cord clamping of neonates and whether written routines had been prepared for this purpose. We defined early umbilical cord clamping as immediate or within 30 seconds and late clamping as ≥ 1 minute or not until pulsation in the umbilical cord had ceased. Fifty (96%) of the maternity institutions returned a completed questionnaire. Twelve institutions (24%) reported to clamp the umbilical cord of full-term neonates early, and 38 (76%) reported to practise late clamping. Nineteen maternity wards (38%) followed written routines for umbilical cord clamping of full-term neonates, and among these, early umbilical cord clamping was practised in nine (47%). In the 31 maternity wards that had no written routines, early umbilical cord clamping was practised in three (10%). Twenty-seven of the maternity wards reported that the child is placed on the maternal abdomen before clamping of the umbilical cord, 14 reported that the child commonly is held below the introitus before umbilical cord clamping, and the rest did not report any consistent practice. There is wide variation in the practice for umbilical cord clamping in Norwegian maternity wards, many of which have no written guidelines. We argue that national guidelines for umbilical cord clamping of neonates should be established.

  12. M. tuberculosis Sliding β-Clamp Does Not Interact Directly with the NAD+ -Dependent DNA Ligase

    Science.gov (United States)

    Kukshal, Vandna; Khanam, Taran; Chopra, Deepti; Singh, Nidhi; Sanyal, Sabyasachi; Ramachandran, Ravishankar

    2012-01-01

    The sliding β-clamp, an important component of the DNA replication and repair machinery, is drawing increasing attention as a therapeutic target. We report the crystal structure of the M. tuberculosis β-clamp (Mtbβ-clamp) to 3.0 Å resolution. The protein crystallized in the space group C2221 with cell-dimensions a = 72.7, b = 234.9 & c = 125.1 Å respectively. Mtbβ-clamp is a dimer, and exhibits head-to-tail association similar to other bacterial clamps. Each monomer folds into three domains with similar structures respectively and associates with its dimeric partner through 6 salt-bridges and about 21 polar interactions. Affinity experiments involving a blunt DNA duplex, primed-DNA and nicked DNA respectively show that Mtbβ-clamp binds specifically to primed DNA about 1.8 times stronger compared to the other two substrates and with an apparent Kd of 300 nM. In bacteria like E. coli, the β-clamp is known to interact with subunits of the clamp loader, NAD+ -dependent DNA ligase (LigA) and other partners. We tested the interactions of the Mtbβ-clamp with MtbLigA and the γ-clamp loader subunit through radioactive gel shift assays, size exclusion chromatography, yeast-two hybrid experiments and also functionally. Intriguingly while Mtbβ-clamp interacts in vitro with the γ-clamp loader, it does not interact with MtbLigA unlike in bacteria like E. coli where it does. Modeling studies involving earlier peptide complexes reveal that the peptide-binding site is largely conserved despite lower sequence identity between bacterial clamps. Overall the results suggest that other as-yet-unidentified factors may mediate interactions between the clamp, LigA and DNA in mycobacteria. PMID:22545130

  13. Stereotactic biopsy of cerebellar lesions: straight versus oblique frame positioning.

    Science.gov (United States)

    Quick-Weller, Johanna; Brawanski, Nina; Dinc, Nazife; Behmanesh, Bedjahn; Kammerer, Sara; Dubinski, Daniel; Seifert, Volker; Marquardt, Gerhard; Weise, Lutz

    2017-10-26

    Biospies of brain lesions with unknown entity are an everyday procedure among many neurosurgical departments. Biopsies can be performed frame-guided or frameless. However, cerebellar lesions are a special entity with a more complex approach. All biopsies in this study were performed stereotactically frame guided. Therefore, only biopsies of cerebellar lesions were included in this study. We compared whether the frame was attached straight versus oblique and we focused on diagnostic yield and complication rate. We evaluated 20 patients who underwent the procedure between 2009 and 2017. Median age was 56.5 years. 12 (60%) Patients showed a left sided lesion, 6 (30%) showed a lesion in the right cerebellum and 2 (10%) patients showed a midline lesion. The stereotactic frame was mounted oblique in 12 (60%) patients and straight in 8 (40%) patients. Postoperative CT scan showed small, clinically silent blood collection in two (10%) of the patients, one (5%) patient showed haemorrhage, which caused a hydrocephalus. He received an external ventricular drain. In both patients with small haemorrhage the frame was positioned straight, while in the patient who showed a larger haemorrhage the frame was mounted oblique. In all patients a final histopathological diagnosis was established. Cerebellar lesions of unknown entity can be accessed transcerebellar either with the stereotactic frame mounted straight or oblique. Also for cerebellar lesions the procedure shows a high diagnostic yield with a low rate of severe complications, which need further treatment.

  14. Ultrasound-guided renal biopsy: experience using an automated core biopsy system.

    Science.gov (United States)

    Chan, R; Common, A A; Marcuzzi, D

    2000-04-01

    To assess the safety and efficacy of ultrasound-guided percutaneous renal biopsy using an automated core biopsy system, and to determine radiologists' accuracy in predicting sample adequacy. Ninety-five biopsies were performed on 25 native kidneys and 70 renal allografts using a 16-gauge automated, spring-loaded core biopsy device under real-time sonographic guidance. Radiologists performing the biopsy estimated the number of core samples needed to obtain an adequate specimen, based on visual inspection of each core. The final determination of the number of samples was made by a pathology technologist who attended each biopsy, based on preliminary microscopic examination of tissue cores. After each biopsy, an ultrasonographic examination was performed to search for biopsy-related hemorrhage, and a questionnaire was given to the patient to determine biopsy-related complications, which were categorized as either minor or major. The main indication for biopsy was acute renal failure (in 43.2% of biopsies). An average of 3 tissue cores per biopsy were obtained. Of the 94 patients in whom a biopsy was conducted to exclude diffuse renal disease, a mean of 12.5 glomeruli were present in each specimen. Overall, adequate tissue for diagnosis was obtained in 98.9% of cases. The radiologists' estimate of the number of core samples needed concurred with the pathology technologists' determination of sample adequacy in 88.4% of cases. A total of 26 complications occurred (in 27.4% of biopsies), consisting of 23 minor (24.2%) and 3 major (3.2%) complications. Real-time sonographic guidance in conjunction with an automated core biopsy system is a safe and accurate method of performing percutaneous renal biopsy. Routine use of sonographic examinations to search for biopsy-related complications is not indicated. Radiologists are accurate in estimating sample adequacy in most cases; however, the presence of a pathology technologist at the biopsy procedure virtually eliminates the

  15. Delayed Umbilical Cord Clamping in the 21st Century: Indications for Practice.

    Science.gov (United States)

    Bayer, Kimberly

    2016-02-01

    Health care providers have debated the timing of umbilical cord clamping since the days of Aristotle. Delayed cord clamping was the mainstay of practice until about the 1950s when it was changed to immediate clamping on the basis of a series of blood volume studies combined with the introduction of active management of the third stage of labor. However, in recent years, several systematic reviews advise that delayed cord clamping should be used in all births for at least 30 to 60 seconds. The purpose of this article is to discuss the physiology of umbilical cord clamping, the potential benefits and adverse effects of delayed cord clamping, and how this affects the advanced practice nurse. A search of PubMed, Cochrane Reviews, and Clinical Key was used to find relevant research on the topic of umbilical cord clamping. Potential benefits of delayed cord clamping include decreased frequency of iron-deficiency anemia in the first year of life with improved neurodevelopmental outcomes in term infants, reduced need for blood transfusions, possible autologous transfusion of stem cells, and a decreased incidence of intraventricular hemorrhage. Apprehension exists regarding the feasibility of the practice as well as the potential hindrance of immediate resuscitation. There is a need to begin to look for populations for which delayed cord clamping can be implemented. Recommendations are inconsistent on the patient population and timing; therefore, further studies are needed to understand the multiple variables that affect timing of umbilical cord clamping.

  16. Electrostatic Interactions at the Dimer Interface Stabilize the E. coli β Sliding Clamp.

    Science.gov (United States)

    Purohit, Anirban; England, Jennifer K; Douma, Lauren G; Tondnevis, Farzaneh; Bloom, Linda B; Levitus, Marcia

    2017-08-22

    Sliding clamps are ring-shaped oligomeric proteins that encircle DNA and associate with DNA polymerases for processive DNA replication. The dimeric Escherichia coli β-clamp is closed in solution but must adopt an open conformation to be assembled onto DNA by a clamp loader. To determine what factors contribute to the stability of the dimer interfaces in the closed conformation and how clamp dynamics contribute to formation of the open conformation, we identified conditions that destabilized the dimer and measured the effects of these conditions on clamp dynamics. We characterized the role of electrostatic interactions in stabilizing the β-clamp interface. Increasing salt concentration results in decreased dimer stability and faster subunit dissociation kinetics. The equilibrium dissociation constant of the dimeric clamp varies with salt concentration as predicted by simple charge-screening models, indicating that charged amino acids contribute to the remarkable stability of the interface at physiological salt concentrations. Mutation of a charged residue at the interface (Arg-103) weakens the interface significantly, whereas effects are negligible when a hydrophilic (Ser-109) or a hydrophobic (Ile-305) amino acid is mutated instead. It has been suggested that clamp opening by the clamp loader takes advantage of spontaneous opening-closing fluctuations at the clamp's interface, but our time-resolved fluorescence and fluorescence correlation experiments rule out conformational fluctuations that lead to a significant fraction of open states. Copyright © 2017 Biophysical Society. Published by Elsevier Inc. All rights reserved.

  17. Clamped seismic metamaterials: ultra-low frequency stop bands

    Science.gov (United States)

    Achaoui, Y.; Antonakakis, T.; Brûlé, S.; Craster, R. V.; Enoch, S.; Guenneau, S.

    2017-06-01

    The regularity of earthquakes, their destructive power, and the nuisance of ground vibration in urban environments, all motivate designs of defence structures to lessen the impact of seismic and ground vibration waves on buildings. Low frequency waves, in the range 1-10 Hz for earthquakes and up to a few tens of Hz for vibrations generated by human activities, cause a large amount of damage, or inconvenience; depending on the geological conditions they can travel considerable distances and may match the resonant fundamental frequency of buildings. The ultimate aim of any seismic metamaterial, or any other seismic shield, is to protect over this entire range of frequencies; the long wavelengths involved, and low frequency, have meant this has been unachievable to date. Notably this is scalable and the effects also hold for smaller devices in ultrasonics. There are three approaches to obtaining shielding effects: bragg scattering, locally resonant sub-wavelength inclusions and zero-frequency stop-band media. The former two have been explored, but the latter has not and is examined here. Elastic flexural waves, applicable in the mechanical vibrations of thin elastic plates, can be designed to have a broad zero-frequency stop-band using a periodic array of very small clamped circles. Inspired by this experimental and theoretical observation, all be it in a situation far removed from seismic waves, we demonstrate that it is possible to achieve elastic surface (Rayleigh) wave reflectors at very large wavelengths in structured soils modelled as a fully elastic layer periodically clamped to bedrock. We identify zero frequency stop-bands that only exist in the limit of columns of concrete clamped at their base to the bedrock. In a realistic configuration of a sedimentary basin 15 m deep we observe a zero frequency stop-band covering a broad frequency range of 0-30 Hz.

  18. Analysis of motion during the breast clamping phase of mammography.

    Science.gov (United States)

    Ma, Wang Kei; McEntee, Mark F; Mercer, Claire; Kelly, Judith; Millington, Sara; Hogg, Peter

    2016-01-01

    To measure paddle motion during the clamping phase of a breast phantom for a range of machine/paddle combinations. A deformable breast phantom was used to simulate a female breast. 12 mammography machines from three manufacturers with 22 flexible and 20 fixed paddles were evaluated. Vertical motion at the paddle was measured using two calibrated linear potentiometers. For each paddle, the motion in millimetres was recorded every 0.5 s for 40 s, while the phantom was compressed with 80 N. Independent t-tests were used to determine differences in paddle motion between flexible and fixed, small and large, GE Senographe Essential (General Electric Medical Systems, Milwaukee, WI) and Hologic Selenia Dimensions paddles (Hologic, Bedford, MA). Paddle tilt in the medial-lateral plane for each machine/paddle combination was calculated. All machine/paddle combinations demonstrate highest levels of motion during the first 10 s of the clamping phase. The least motion is 0.17 ± 0.05 mm/10 s (n = 20) and the most motion is 0.51 ± 0.15 mm/10 s (n = 80). There is a statistical difference in paddle motion between fixed and flexible (p Hologic Selenia Dimensions paddles (p < 0.001). Paddle tilt in the medial-lateral plane is independent of time and varied from 0.04 ° to 0.69 °. All machine/paddle combinations exhibited motion and tilting, and the extent varied with machine and paddle sizes and types. This research suggests that image blurring will likely be clinically insignificant 4 s or more after the clamping phase commences.

  19. [Time of cord clamping and neonatal complications, a prospective study].

    Science.gov (United States)

    Rincón, D; Foguet, A; Rojas, M; Segarra, E; Sacristán, E; Teixidor, R; Ortega, A

    2014-09-01

    To assess the effects of early or late clamping of the umbilical cord in term newborns, assessing the levels of hemoglobin, hematocrit, and ferritin, and their correlation with some of the complications. A prospective study of healthy newborns at term or born by dystotic or eutocic delivery in our hospital between May 2009 until May 2010. Patients were assigned according to the time of clamping, group 1 (<60 seconds), group 2 (1 to<2 minutes), and group 3 (2 to 3 minutes). Laboratory tests were performed at birth and at 48 hours of life, assessing the levels of hemoglobin, hematocrit, ferritin, and bilirubin. The risk of polycythemia, respiratory distress syndrome, neonatal phototherapy or admission to the Intensive Care Unit and the hospital stay, were evaluated. A total of 242 patients were included: group 1 (g1=80), group 2 (g2=31) y group 3 (g3=131). The background maternal and neonatal characteristics were similar in all sets. The first test showed significant differences in ferritin levels in those infants with delayed clamping (g1: 111 mg/dl, g2: 125 mg/dl, g3: 173 mg/dl; p<0.01). In the second analysis the values of hemoglobin (g1: 17.3 g/dl, g2: 18.9 g/dl, g3: 19.2 g/dl; p<0.01), hematocrit (g1: 53.4%, g2: 58%, g3: 59%; p<0.01) and ferritin (g1: 254 mg/dl, g2: 254.7 mg/dl, g3: 313 mg/dl; p = 0.008) were statistically higher in this group. As regards complications, a significant increase was observed in the number of cases of polycythemia symptoms in group 3. The late cord clamping is associated with an increase in hematocrit, hemoglobin and ferritin at 48 hours of life, as well as an increased risk of polycythemia present with symptoms. Copyright © 2013 Asociación Española de Pediatría. Published by Elsevier Espana. All rights reserved.

  20. Potassium Chloride Versus Voltage Clamp Contractures in Ventricular Muscle

    Science.gov (United States)

    Morad, M.; Reeck, S.; Rao, M.

    1981-01-01

    In frog ventricle, developed tension was markedly larger in response to depolarization caused by a voltage clamp step than to depolarization induced by high concentrations of potassium chloride. Measurement of extracellular potassium activity at the surface and at the depth of muscle during the development of contractures showed that the diffusion of potassium is much slower than the spread of depolarization through the cross section of muscle. These two observations suggest that competition between the depolarizing and the negative inotropic effects of an increase in the extracellular potassium ion concentration may determine the time course and magnitude of contractile tension in heart muscle.

  1. Infective endocarditis with spondylodiscitis after prostate biopsy

    Directory of Open Access Journals (Sweden)

    Fernando Pivatto Júnior

    2014-04-01

    Full Text Available Transrectal ultrasonography-guided prostate needle biopsy is the ideal method to obtain prostate specimens for histological analysis and is therefore frequently used in clinical practice. In the majority of the studies, prostate biopsy is considered a safe procedure with few major complications. In the present report, we describe a case of endocarditis with spondylodiscitis, two very rare complications of prostate biopsy.

  2. Biopsy-proven childhood glomerulonephritis in Johor.

    Science.gov (United States)

    Khoo, J J; Pee, S; Thevarajah, B; Yap, Y C; Chin, C K

    2004-06-01

    There has been no published study of biopsy-proven childhood glomerulonephritis in Malaysia. To determine the pattern of childhood glomerulonephritis in Johor, Malaysia from a histopathological perspective and the various indications used for renal biopsy in children. Retrospective study was done of all renal biopsies from children under 16 years of age, received in Sultanah Aminah Hospital, Johor between 1994 and 2001. The histopathological findings were reviewed to determine the pattern of biopsy-proven glomerulonephritis. The indications for biopsy, mode of therapy given after biopsy and the clinical outcome were studied. 122 adequate biopsies were received, 9 children had repeat biopsies. Of the 113 biopsies, minimal change disease formed the most common histopathological diagnosis (40.7%) while lupus nephritis formed the most common secondary glomerulonephritis (23.0%). The main indications for biopsy were nephrotic syndrome (50.8%), lupus nephritis (25.4%) and renal impairment (13.1%). The mode of therapy was changed in 59.8% of the children. Of 106 patients followed-up, 84 children were found to have normal renal function in remission or on treatment. 4 patients developed chronic renal impairment and 16 reached end stage renal disease. Five of the 16 children with end stage disease had since died while 11 were on renal replacement therapy. Another 2 patients died of other complications. The pattern of childhood GN in our study tended to reflect the more severe renal parenchymal diseases in children and those requiring more aggressive treatment. This was because of our criteria of selection (indication) for renal biopsy. Renal biopsy where performed appropriately in selected children may not only be a useful investigative tool for histological diagnosis and prognosis but may help clinicians plan the optimal therapy for these children.

  3. Can Sonovue targeted biopsy replace extended or saturation biopsy in prostate cancer diagnosis? Our experience at primary and repeat biopsy.

    Science.gov (United States)

    Pepe, Pietro; Candiano, Giuseppe; Pennisi, Michele; Aragona, Francesco

    2010-09-01

    To evaluate the detection rate of prostate cancer (PCa) at initial and repeat biopsy in patients submitted to Sonovue targeted biopsy vs extended or saturation prostate biopsy (SPBx). From November 2007 to April 2008 60 patients aged 64 years (median) underwent extended TRUS-guided transperineal prostate biopsy. Indications to biopsy were: abnormal DRE, PSA > 10 ng/mL; PSA included between 2.6 and 4.0 and 4.1 and 10 ng/mL with %free/total PSA digital rectal examination was positive in 9 vs 3 patients, respectively. Before performing extended or SPBx scheme in case of primary (19 cores) and repeated (28 cores) procedure, prostate areas characterized by absence of enhancement after Sonovue (2.4 mg) administration on gray scale during continuous harmonic imaging (HI) contrast-enhanced ultrasound (CEUS) were considered suspicious for PCa and submitted to targeted biopsy. 3.5 (median) targeted biopsies were performed in the peripheral zone of 22 men. In patients who underwent primary and repeated biopsy PCa was detected in 20/45 (44.5%) and 3/15 (20%) cases, but Sonovue detected only 6/20 (30%) and 1/3 (33.4%) of cancers, respectively. Sensitivity and specificity of Sonovue in diagnosing PCa was equal to 30.0% and 61.5% (primary biopsy) vs 33.4% and 54.5% (repeated biopsy). Based on its low diagnostic accuracy, Sonovue CEUS HI targeted biopsy can not replace extended or SPBx in diagnosing PCa.

  4. Nerve Biopsy In The Diagnosis Of Leporsy

    Directory of Open Access Journals (Sweden)

    Hazra B

    1997-01-01

    Full Text Available Skin and nerve biopsies were done in 33 cases of different clinical types of leprosy selected from Dermatology OPD of Medical College and Hospitals, Calcutta during 1994-95. Histopathological results were compared with emphasis on the role of nerve biopsies in detection of patients with multibacillary leprosy. The evident possibility of having patients with multibacillary leprosy in peripheral leprosy with multiple drugs. It is found that skin and nerve biopsy are equally informative in borderline and lepromatour leprosy and is the only means to diagnose polyneuritic leprosy. Nerve biopsy appears to be more informative in the diagnosis of all clinical types of leprosy.

  5. Robotic Prostate Biopsy in Closed MRI Scanner

    National Research Council Canada - National Science Library

    Fischer, Gregory

    2008-01-01

    .... This work enables prostate brachytherapy and biopsy procedures in standard high-field diagnostic MRI scanners through the development of a robotic needle placement device specifically designed...

  6. Needle muscle biopsy and its application

    Directory of Open Access Journals (Sweden)

    Meng-long CHEN

    2015-07-01

    Full Text Available Needle muscle biopsy is a straightforward and reliable minimally-invasive technique. During the past century, the needle biopsy can provide adequate samples and the technique has gradually gained wider acceptance. Compared with open biopsy, needle biopsy is less traumatic, with low rate of complications, and is suitable for the identifications and evaluations of muscular dystrophy, inflammatory myopathies and systemic diseases involving muscles, specially for infants and young children. Domestic insiders should be encouraged to apply this technique. DOI: 10.3969/j.issn.1672-6731.2015.06.003 

  7. Hypoxia marker labeling in tumor biopsies: quantification of labeling variation and criteria for biopsy sectioning

    International Nuclear Information System (INIS)

    Thrall, Donald E.; Rosner, Gary L.; Azuma, Chieko; McEntee, Margaret C.; Raleigh, James A.

    1997-01-01

    Background and purpose: The error associated with using biopsy-based methods for assessing parameters reflective of the tumor microenvironment depends on the variability in distribution of the parameter throughout the tumor and the biopsy sample. Some attention has been given to intratumoral distribution of parameters, but little attention has been given to their intrabiopsy distribution. We evaluated the intrabiopsy distribution of CCI-103F, a 2-nitroimidazole hypoxia marker. Materials and methods: The hypoxia marker CCI-103F was studied in dogs bearing spontaneous solid tumors. Two biopsies were taken from each of seven tumors, for a total of 14 biopsies. Biopsies were serially sectioned and four to six contiguous slides from each 100-150 μm of the biopsy were used to formulate the best estimate of CCI-103F labeled area throughout the biopsy sample. One, two or four slides were then randomly selected from each biopsy and the labeled area, based on this limited sample, was compared to the estimate obtained from counting all available slides. Random sampling of slides was repeated 1000 times for each biopsy sample. Results: CCI-103F labeling variance throughout the biopsy decreased as the estimated overall labeled area in the biopsy decreased. The error associated with estimating the overall labeled area in a biopsy from a randomly selected subset of slides decreased as the number of slides increased, and as the overall labeled area in the biopsy decreased. No minimally labeled biopsy was classified as unlabeled based on limited sampling. Conclusion: With regard to CCI-103F labeling, quantification of the labeled area in four randomly selected slides from a biopsy can provide, in most biopsies, an estimate of the labeled area in the biopsy within an absolute range of ±0.05

  8. The selective poly(ADP)ribose-polymerase 1 inhibitor INO1001 reduces spinal cord injury during porcine aortic cross-clamping-induced ischemia/reperfusion injury.

    Science.gov (United States)

    Maier, Christian; Scheuerle, Angelika; Hauser, Balázs; Schelzig, Hubert; Szabó, Csaba; Radermacher, Peter; Kick, Jochen

    2007-05-01

    It is well-established that poly(ADP)ribose-polymerase (PARP) assumes major importance during ischemic brain damage, and the selective PARP-1 inhibitor PJ34 reduced spinal cord damage in murine aortic occlusion-induced ischemia/reperfusion injury. We investigated the effect of the PARP-1 inhibitor INO1001 on aortic-occlusion-related porcine spinal cord injury. Prospective, randomized, controlled experimental study in an animal laboratory. Ten anesthetized, mechanically ventilated, and instrumented pigs. Animals underwent 45 min of thoracic aortic cross-clamping after receiving vehicle (n=5) or intravenous INO1001 (n=5, total dose 4 mg/kg administered both before clamping and during reperfusion). During reperfusion continuous intravenous norepinephrine was incrementally adjusted to maintain blood pressure at or above 80% of the preclamping level. Plasma INO1001 levels were analyzed by HPLC. After 4[Symbol: see text]h of reperfusion spinal cord biopsy samples were analyzed for neuronal damage (hematoxyline-eosine and Nissl staining), expression of the cyclin-dependent kinase inhibitor genes p21 and p27 (immunohistochemistry), and apoptosis (terminal deoxynucleotidyl transferase mediated nick end labeling assay). Plasma INO1001 levels were 0.8-2.3 and 0.30-0.76 mM before and after clamping, respectively. While 3-5% of the spinal cord neurons were irreversibly damaged in the INO1001 animals, the neuronal cell injury was three times higher in the control group. Neither p21 and p27 expression nor apoptosis showed any intergroup difference. The selective PARP-1 inhibitor INO1001 markedly reduced aortic occlusion-induced spinal cord injury. Given the close correlation reported in the literature between morphological damage and impaired spinal cord function, INO1001 may improve spinal cord recovery after thoracic aortic cross-clamping.

  9. Dynamic analysis of slender launching system connected by clamp band joint using harmonic balance method

    International Nuclear Information System (INIS)

    Qin, Z Y; Yan, S Z; Chu, F L

    2013-01-01

    Clamp band joints are widely used to fasten spacecrafts onto launching systems. Due to the unilateral constraints and the frictional slippage at the joint interface, clamp band joints may bring nonlinearity into launching systems during launching process. In this paper, the dynamics of a slender launching system with clamp band joint is investigated using harmonic balance method. Firstly, the formulas for the joint stiffness of the clamp band joint are proposed. Then, the finite element model for the launch vehicle and the spacecraft connected by the clamp band joint is developed, where the clamp band joint is represented by a massless beam element. Finally, harmonic balance method is applied to calculate the steady state response of the launching system

  10. Load-deflection characteristics of small-bore insulated-pipe clamps

    International Nuclear Information System (INIS)

    Severud, L.K.; Clark, G.L.

    1981-12-01

    The special insulated clamps used on both FFTF and CRBR piping utilize a Belleville spring arrangement to compensate for pipe thermal expansion. Analysis indicates that this produces a non-linear, directionally sensitive clamp spring rate. Since these spring rates influence the seismic response of a supported piping system, it was deemed necessary to evaluate them further by test. This has been accomplished for the FFTF clamps. A more standard insulated pipe clamp, which does not incorporate Belleville springs to accommodate thermal expansion, was also tested. This type clamp is simple in design, and economically attractive. It may have wide application prospects for use in LMFBR small bore auxiliary piping operating at temperatures below 427 0 C. Load deflection tests were conducted on 2.54 CM and 7.62 CM diameter samples of these commercial clamps

  11. The need for using fluoroscopic guidance to obtain gastric biopsies when in search of Helicobacter pylori with a nonendoscopic method

    International Nuclear Information System (INIS)

    Bender, Greg N.; Mullins, Daniel J.; Makuch, Richard S.

    1999-01-01

    Purpose: Nonendoscopic, fluoroscopic biopsy of the gastric mucosa, following barium examination of the stomach, has gained attention with its ease of performance and cost savings potential over endoscopy. Endoscopic research concerning the efficacy of biopsy sites has revealed an increased sensitivity of antral biopsies over greater curvature biopsies for the detection of Helicobacter pylori. Fluoroscopically guided biopsies of the gastric mucosal are studied to determine whether such a difference between site sensitivity held true. If not, blind biopsy through a nasogastric tube, which traditionally samples only the greater curvature, might prove an even less expensive alternative. Materials and methods: Seventy-two patients underwent nonendoscopic, fluoroscopically guided, mucosal biopsy of both the gastric antrum and the greater curvature of the stomach. Pathologic reports from both sites, using each patient as their own control, are compared to assess site sensitivity in the diagnosis of H. pylori gastritis. Results: The sensitivity for the detection of H. pylori gastritis by antral biopsy is 89% whereas the sensitivity of greater curvature biopsy is 62%. The difference is considered clinically significant at P≤0.05. Conclusions: This study confirms the need for antral biopsies when desiring a nonendoscopic approach to gastric mucosal sampling, in order to obtain a reasonable yield of data in dyspeptic patients with H. pylori gastritis. Blind techniques cannot reliably reach the antrum. Fluoroscopy can, and remains a less expensive alternative to endoscopy

  12. The need for using fluoroscopic guidance to obtain gastric biopsies when in search of Helicobacter pylori with a nonendoscopic method

    Energy Technology Data Exchange (ETDEWEB)

    Bender, Greg N.; Mullins, Daniel J.; Makuch, Richard S

    1999-12-01

    Purpose: Nonendoscopic, fluoroscopic biopsy of the gastric mucosa, following barium examination of the stomach, has gained attention with its ease of performance and cost savings potential over endoscopy. Endoscopic research concerning the efficacy of biopsy sites has revealed an increased sensitivity of antral biopsies over greater curvature biopsies for the detection of Helicobacter pylori. Fluoroscopically guided biopsies of the gastric mucosal are studied to determine whether such a difference between site sensitivity held true. If not, blind biopsy through a nasogastric tube, which traditionally samples only the greater curvature, might prove an even less expensive alternative. Materials and methods: Seventy-two patients underwent nonendoscopic, fluoroscopically guided, mucosal biopsy of both the gastric antrum and the greater curvature of the stomach. Pathologic reports from both sites, using each patient as their own control, are compared to assess site sensitivity in the diagnosis of H. pylori gastritis. Results: The sensitivity for the detection of H. pylori gastritis by antral biopsy is 89% whereas the sensitivity of greater curvature biopsy is 62%. The difference is considered clinically significant at P{<=}0.05. Conclusions: This study confirms the need for antral biopsies when desiring a nonendoscopic approach to gastric mucosal sampling, in order to obtain a reasonable yield of data in dyspeptic patients with H. pylori gastritis. Blind techniques cannot reliably reach the antrum. Fluoroscopy can, and remains a less expensive alternative to endoscopy.

  13. Fluoroscopy-Guided Percutaneous Vertebral Body Biopsy Using a Novel Drill-Powered Device: Technical Case Series

    Energy Technology Data Exchange (ETDEWEB)

    Wallace, Adam N., E-mail: wallacea@mir.wustl.edu; Pacheco, Rafael A., E-mail: pachecor@mir.wustl.edu; Tomasian, Anderanik, E-mail: tomasiana@mir.wustl.edu [Washington University School of Medicine, Mallinckrodt Institute of Radiology (United States); Hsi, Andy C., E-mail: hsia@path.wustl.edu [Washington University School of Medicine, Division of Anatomic Pathology, Department of Pathology & Immunology (United States); Long, Jeremiah, E-mail: longj@mir.wustl.edu [Washington University School of Medicine, Mallinckrodt Institute of Radiology (United States); Chang, Randy O., E-mail: changr@wusm.wustl.edu [Washington University School of Medicine (United States); Jennings, Jack W., E-mail: jenningsj@mir.wustl.edu [Washington University School of Medicine, Mallinckrodt Institute of Radiology (United States)

    2016-02-15

    BackgroundA novel coaxial biopsy system powered by a handheld drill has recently been introduced for percutaneous bone biopsy. This technical note describes our initial experience performing fluoroscopy-guided vertebral body biopsies with this system, compares the yield of drill-assisted biopsy specimens with those obtained using a manual technique, and assesses the histologic adequacy of specimens obtained with drill assistance.MethodsMedical records of all single-level, fluoroscopy-guided vertebral body biopsies were reviewed. Procedural complications were documented according to the Society of Interventional Radiology classification. The total length of bone core obtained from drill-assisted biopsies was compared with that of matched manual biopsies. Pathology reports were reviewed to determine the histologic adequacy of specimens obtained with drill assistance.ResultsTwenty eight drill-assisted percutaneous vertebral body biopsies met study inclusion criteria. No acute complications were reported. Of the 86 % (24/28) of patients with clinical follow-up, no delayed complications were reported (median follow-up, 28 weeks; range 5–115 weeks). The median total length of bone core obtained from drill-assisted biopsies was 28 mm (range 8–120 mm). This was longer than that obtained from manual biopsies (median, 20 mm; range 5–45 mm; P = 0.03). Crush artifact was present in 11 % (3/28) of drill-assisted biopsy specimens, which in one case (3.6 %; 1/28) precluded definitive diagnosis.ConclusionsA drill-assisted, coaxial biopsy system can be used to safely obtain vertebral body core specimens under fluoroscopic guidance. The higher bone core yield obtained with drill assistance may be offset by the presence of crush artifact.

  14. Renal function is the same 6 months after robot-assisted partial nephrectomy regardless of clamp technique: analysis of outcomes for off-clamp, selective arterial clamp and main artery clamp techniques, with a minimum follow-up of 1 year.

    Science.gov (United States)

    Komninos, Christos; Shin, Tae Young; Tuliao, Patrick; Han, Woong Kyu; Chung, Byung Ha; Choi, Young Deuk; Rha, Koon Ho

    2015-06-01

    To compare the renal functional outcomes, with >1 year of follow-up, of patients who underwent robot-assisted partial nephrectomy (RAPN) performed with different clamping techniques. The peri-operative data of patients undergoing RAPN performed with different clamping techniques were retrospectively analysed (group 1: off-clamp, n = 23; group 2: selective clamp, n = 25; group 3: main artery clamp, n = 114). The main outcome measures were postoperative serum creatinine level, estimated glomerular filtration rate (eGFR) and percentage change in eGFR, the data for which were collected at periodic intervals during the first 12 months and annually thereafter, in addition to late eGFR value. Only patients with >1 year of follow-up were included in the analysis. The baseline characteristics of groups 2 and 3 were similar, while patients in group 1 had smaller sized tumours and lower tumour complexity. The median follow-up periods were 45 (group 1), 20 (group 2) and 47 (group 3) months. The median clamping times were 24.8 min in the main artery clamp and 18 min in the selective artery clamp groups. Group 2 had greater median blood loss volume (100 vs 500 vs 200 mL for groups 1, 2 and 3, respectively; P clamp procedure and tumour complexity score were predictive of normal renal function 7 days after surgery, while only baseline eGFR and age could predict it 1 year postoperatively. Off-clamp and selective artery clamp techniques result in superior short-term renal functional outcomes compared with the main artery clamp approach; however, after the 6th postoperative month, there were no significant differences regarding the functional outcome among the above surgical techniques, as long as the warm ischaemia time was 20-30 min. © 2014 The Authors BJU International © 2014 BJU International.

  15. Microchip amplifier for in vitro, in vivo, and automated whole cell patch-clamp recording.

    Science.gov (United States)

    Harrison, Reid R; Kolb, Ilya; Kodandaramaiah, Suhasa B; Chubykin, Alexander A; Yang, Aimei; Bear, Mark F; Boyden, Edward S; Forest, Craig R

    2015-02-15

    Patch clamping is a gold-standard electrophysiology technique that has the temporal resolution and signal-to-noise ratio capable of reporting single ion channel currents, as well as electrical activity of excitable single cells. Despite its usefulness and decades of development, the amplifiers required for patch clamping are expensive and bulky. This has limited the scalability and throughput of patch clamping for single-ion channel and single-cell analyses. In this work, we have developed a custom patch-clamp amplifier microchip that can be fabricated using standard commercial silicon processes capable of performing both voltage- and current-clamp measurements. A key innovation is the use of nonlinear feedback elements in the voltage-clamp amplifier circuit to convert measured currents into logarithmically encoded voltages, thereby eliminating the need for large high-valued resistors, a factor that has limited previous attempts at integration. Benchtop characterization of the chip shows low levels of current noise [1.1 pA root mean square (rms) over 5 kHz] during voltage-clamp measurements and low levels of voltage noise (8.2 μV rms over 10 kHz) during current-clamp measurements. We demonstrate the ability of the chip to perform both current- and voltage-clamp measurement in vitro in HEK293FT cells and cultured neurons. We also demonstrate its ability to perform in vivo recordings as part of a robotic patch-clamping system. The performance of the patch-clamp amplifier microchip compares favorably with much larger commercial instrumentation, enabling benchtop commoditization, miniaturization, and scalable patch-clamp instrumentation. Copyright © 2015 the American Physiological Society.

  16. Mechanism of ATP-driven PCNA clamp loading by S. cerevisiae RFC.

    Science.gov (United States)

    Chen, Siying; Levin, Mikhail K; Sakato, Miho; Zhou, Yayan; Hingorani, Manju M

    2009-05-08

    Circular clamps tether polymerases to DNA, serving as essential processivity factors in genome replication, and function in other critical cellular processes as well. Clamp loaders catalyze clamp assembly onto DNA, and the question of how these proteins construct a topological link between a clamp and DNA, especially the mechanism by which ATP is utilized for the task, remains open. Here we describe pre-steady-state analysis of ATP hydrolysis, proliferating cell nuclear antigen (PCNA) clamp opening, and DNA binding by Saccharomyces cerevisiae replication factor C (RFC), and present the first kinetic model of a eukaryotic clamp-loading reaction validated by global data analysis. ATP binding to multiple RFC subunits initiates a slow conformational change in the clamp loader, enabling it to bind and open PCNA and to bind DNA as well. PCNA opening locks RFC into an active state, and the resulting RFC.ATP.PCNA((open)) intermediate is ready for the entry of DNA into the clamp. DNA binding commits RFC to ATP hydrolysis, which is followed by PCNA closure and PCNA.DNA release. This model enables quantitative understanding of the multistep mechanism of a eukaryotic clamp loader and furthermore facilitates comparative analysis of loaders from diverse organisms.

  17. Modeling of SVM Diode Clamping Three-Level Inverter Connected to Grid

    DEFF Research Database (Denmark)

    Guo, Yougui; Zeng, Ping; Zhu, Jieqiong

    2011-01-01

    PLECS is used to model the diode clamping three-level inverter connected to grid and good results are obtained. First the output voltage SVM is described for diode clamping three-level inverter with loads connected to Y. Then the output voltage SVM of diode clamping three-level inverter is simply...... analyzed with loads connected to △. But it will be further researched in the future. Third, PLECS is briefly introduced. Fourth, the modeling of diode clamping three-level inverter is briefly presented with PLECS. Finally, a series of simulations are carried out. The simulation results tell us PLECS...

  18. Cryogenic Clamp-on Ultrasonic Flowmeters using Single Crystal Piezoelectric Transducers, Phase I

    Data.gov (United States)

    National Aeronautics and Space Administration — Clamp-on ultrasound cryogenic flowmeters using single crystal piezoelectric transducers are proposed to enable reliable, accurate cryogenic instrumentation needs in...

  19. Three-dimensional renal CT angiography for guiding segmental renal artery clamping during laparoscopic partial nephrectomy

    International Nuclear Information System (INIS)

    Xu, Yi; Shao, Pengfei; Zhu, Xiaomei; Lv, Qiang; Liu, Wangyan; Xu, Hai; Zhu, Yinsu; Yang, Guangyu; Tang, Lijun; Yin, Changjun

    2013-01-01

    Aim: To evaluate the effectiveness of three-dimensional (3D) renal computed tomography angiography (CTA) in guiding segmental renal artery clamping during laparoscopic partial nephrectomy (LPN). Materials and methods: Forty-three patients with renal tumours undergoing renal CTA before LPN were retrospectively enrolled in this study. 3D arteriogram reconstructed images were created to identify the renal tumour-supplying arteries. The number and location of these targeted vessels were annotated on 3D images preoperatively and compared with the clamped vessels during LPN. The consistency between target vessels annotated at CTA and clamped arteries at LPN was compared both using a patient-based analysis and vessel-based analysis. The χ 2 test was applied to analyse the influence of tumour size, location, and growth pattern on the number of clamped segmental renal branches. Results: On patient-based analysis, the number of targeted vessels was consistent with the clamped vessels during LPN in 33 of 43 patients. On vessel-based analysis, 56 of 65 target vessels annotated at CTA were clamped during LPN. More segmental renal branches (p = 0.04) were clamped in patients with tumours of larger size. Tumour location and growth pattern had no association with the number of clamped segmental branches during LPN. Conclusion: High-quality CTA images and 3D reconstruction images can detect detailed information of tumour-supplying arteries to renal tumours. 3D renal CTA is an effective way to guide segmental renal artery clamping during LPN

  20. How does clamping pressure influence actuation performance of soft ionic polymer–metal composites?

    International Nuclear Information System (INIS)

    Moeinkhah, Hossein; Jung, Jin-Young; Jeon, Jin-Han; Park, K C; Oh, Il-Kwon; Akbarzadeh, Ali; Rezaeepazhand, Jalil

    2013-01-01

    The effect of clamping pressure on the actuation performance of ionic polymer–metal composite (IPMC) actuators is newly investigated by carefully considering changes of mechanical stiffness and electrical resistance due to the interfacial contacts between the IPMC and clamping devices. During the clamping process, the soft ionic exchangeable polymer membrane will be squeezed along the thickness direction in the clamping area, resulting in a change of the mechanical stiffness of the cantilevered IPMCs. Also, the electrical contact resistance between two electrodes of the IPMC and the clamping device will be greatly changed according to the change of clamping pressures. Present experimental results show that clamping pressures between the IPMC and the clamping device will strongly affect the actuation performance of the IPMC actuators. An exact electro-mechanical model is developed to fully describe dynamics of the IPMC actuators by considering structural damping, hydrodynamic loading and electro-mechanical force. This study shows that there exists an optimal clamping pressure to obtain the largest bending deformation of the IPMC actuator because of a trade-off between mechanical stiffness and electrical contact resistance. (paper)

  1. Multicentre evaluation of magnetic resonance imaging supported transperineal prostate biopsy in biopsy-naïve men with suspicion of prostate cancer.

    Science.gov (United States)

    Hansen, Nienke L; Barrett, Tristan; Kesch, Claudia; Pepdjonovic, Lana; Bonekamp, David; O'Sullivan, Richard; Distler, Florian; Warren, Anne; Samel, Christina; Hadaschik, Boris; Grummet, Jeremy; Kastner, Christof

    2017-10-11

    To analyse the detection rates of primary magnetic resonance imaging (MRI)-fusion transperineal prostate biopsy using combined targeted and systematic core distribution in three tertiary referral centres. In this multicentre, prospective outcome study, 807 consecutive biopsy-naïve patients underwent MRI-guided transperineal prostate biopsy, as the first diagnostic intervention, between 10/2012 and 05/2016. MRI was reported following the Prostate Imaging-Reporting and Data System (PI-RADS) criteria. In all, 236 patients had 18-24 systematic transperineal biopsies only, and 571 patients underwent additional targeted biopsies either by MRI-fusion or cognitive targeting if PI-RADS ≥3 lesions were present. Detection rates for any and Gleason score 7-10 cancer in targeted and overall biopsy were calculated and predictive values were calculated for different PI-RADS and PSA density (PSAD) groups. Cancer was detected in 68% of the patients (546/807) and Gleason score 7-10 cancer in 49% (392/807). The negative predictive value of 236 PI-RADS 1-2 MRI in combination with PSAD of PI-RADS 4-5 lesions using targeted plus systematic biopsies, the cancer detection rate of Gleason score 7-10 was significantly higher at 71% vs 59% and 61% with either approach alone (P PI-RADS 3 lesions, the detection rate was 31% with no significant difference to systematic biopsies with 27% (P > 0.05). Limitations include variability of multiparametric MRI (mpMRI) reading and Gleason grading. MRI-based transperineal biopsy performed at high-volume tertiary care centres with a significant experience of prostate mpMRI and image-guided targeted biopsies yielded high detection rates of Gleason score 7-10 cancer. Prostate biopsies may not be needed for men with low PSAD and an unsuspicious MRI. In patients with high probability lesions, combined targeted and systematic biopsies are recommended. © 2017 The Authors BJU International © 2017 BJU International Published by John Wiley & Sons Ltd.

  2. [Use of cellulose acetate millipore filters for the correct orientation of endoscopic biopsies in digestive diseases].

    Science.gov (United States)

    Auriati, L; Truini, M; Sebastiani, P; Bruzzone, G; Fiocca, R

    2003-06-01

    biopsy samples, improves the assessment of several diagnostic features in esophageal and gastric pathology and yields a significant reduction in costs when biopsies from different sites are processed together.

  3. morphological pattern of endometrial biopsies in south

    African Journals Online (AJOL)

    INTRODUCTION. Endometrial biopsies are among the most common specimens submitted for histopathological analysis.1. Endometrial biopsy is a safe, efficient and cost-effective means of evaluating the uterine endometrium. The procedure is usually associated with minimal discomfort and is easily accomplished in the ...

  4. Testicular biopsy: Clinical practice and interpretation

    NARCIS (Netherlands)

    G.R. Dohle (Gert); S. Elzanaty (Saad); N.J. van Casteren (Niels)

    2012-01-01

    textabstractTesticular biopsy was considered the cornerstone of male infertility diagnosis for many years in men with unexplained infertility and azoospermia. Recent guidelines for male infertility have limited the indications for a diagnostic testicular biopsy to the confirmation of obstructive

  5. Transjugular Liver Biopsy: Results of 97 Patients

    Directory of Open Access Journals (Sweden)

    Kemal Deniz

    2012-06-01

    Full Text Available Objective: To evaluate the feasibility and efficacy of transjugular liver biopsy in patients with contraindicated percutaneous biopsy.Materials and Methods: Between June 2005 and April 2010, 97 patients who were admitted for transjugular liver biopsy were enrolled in this retrospective study. All liver biopsies were obtained using an 18 gauge Quick-Core liver biopsy set through the right hepatic vein via the internal jugular vein. Clinical indication, histopathological diagnosis, and complications were noted.Results: Primary technical success was achieved in 93 (95.8% patients. Hepatic veins could not be catheterized and opacified in two patients and in the remaining two patients the veins could be opacified and catheterized but we were not able to pass the biopsy needle into the hepatic vein because of the acute angle between the inferior vena cava and hepatic veins. At least two specimens were obtained from each patient. The most frequent histopathological diagnosis was cirrhosis. A subcutaneous hematoma around the puncture side was encountered in one patient.Conclusion: Transjugular liver biopsy is a feasible and effective alternative in patients with contraindication for percutaneous biopsy.

  6. Ultrasound guided synovial biopsy of the wrist

    NARCIS (Netherlands)

    van Vugt, R. M.; van Dalen, A.; Bijlsma, J. W.

    1997-01-01

    Seven patients (4 female and 3 male, mean age 46) with arthritis of the wrist (n = 7) without known etiology were evaluated. High-definition ultrasound equipment was used for localization of synovial hypertrophy, suitable for ultrasound guided biopsy without risk. A 18-gauge diameter Tru-cut biopsy

  7. 'Microerosions' in rectal biopsies in Crohn's disease

    DEFF Research Database (Denmark)

    Poulsen, Steen Seier

    1984-01-01

    Small (less than 1 mm), superficial erosions ('microerosions') have been observed stereo-microscopically in surface-stained rectal biopsies in Crohn's disease (CD). Biopsy specimens from 97 patients with CD, 225 with ulcerative colitis (UC), and a control material of 161 patients were investigated...

  8. Coeliac disease: to biopsy or not?

    Science.gov (United States)

    Reilly, Norelle R; Husby, Steffen; Sanders, David S; Green, Peter H R

    2018-01-01

    Coeliac disease is increasingly recognized as a global problem in both children and adults. Traditionally, the findings of characteristic changes of villous atrophy and increased intraepithelial lymphocytosis identified in duodenal biopsy samples taken during upper gastrointestinal endoscopy have been required for diagnosis. Although biopsies remain advised as necessary for the diagnosis of coeliac disease in adults, European guidelines for children provide a biopsy-sparing diagnostic pathway. This approach has been enabled by the high specificity and sensitivity of serological testing. However, these guidelines are not universally accepted. In this Perspective, we discuss the pros and cons of a biopsy-avoiding pathway for the diagnosis of coeliac disease, especially in this current era of the call for more biopsies, even from the duodenal bulb, in the diagnosis of coeliac disease. In addition, a contrast between paediatric and adult guidelines is presented.

  9. Prostate cancer diagnostics with biopsy material

    Directory of Open Access Journals (Sweden)

    Fedorina Т.A.

    2013-12-01

    Full Text Available The aim of the article is to study the potential importance of specific location of biopsy of prostate cancer. Material and methods. Histological material from 700 patients has been examinated. 580 specimen of radical prostatectomy were examined. TRUS-guided 12-cores biopsy has been performed in all patients. Histological, computer morphomet-ric, immunohistochemal methods (PIN4-coctail, AR were used. Results. It has been established that undergrading of carcinoma in needle biopsy occurred in 26% of patients. Overgrading of carcinoma in needle biopsy may also occur, but it was only found in 3% of cases. Undergrading results have been explained by low amount of tumor elements taken from tiny areas of carcinoma, multicentric growth and heterogenous structure of tumor. Conclusions. An important task is to identify the minimal or limited adenocarcinoma in biopsies, as tumor of >1cc volume is often found in prostatectomy specimen.

  10. Papillary lesions of the breast: comparison of the US-guided 14-gauge automated gun method and the 11-gauge directional vacuum-assisted biopsy method

    International Nuclear Information System (INIS)

    Ko, Eun Sook; Cho, Nariya; Yang, Sang Kyu; Kim, Do Youn; Moon, Woo Kyung

    2006-01-01

    The compare the outcomes of US-guided 14-gauge automated biopsy and 11-gauge vacuum-assisted biopsy for the papillary lesions of the breast. We retrospectively reviewed the US-guided core biopsies of 1,723 consecutive breast lesions that were treated from January 2003 to April 2005. Ninety-eight lesions (5.7%) were pathologically reported as papillary lesions. The biopsies were performed with using a 14-gauge automated gun on 65 lesions or with using an 11-gauge vacuum-assisted device on 33 lesions. Thirty-five lesions (54%, 35/65) of 14-gauge automated gun biopsies and 5 lesions (15%, 5/33) of 11-gauge vacuum-assisted biopsies underwent surgery. The histologic findings were compared with the surgical, imaging and follow-up findings. The histologic underestimation rate, the repeat biopsy rate and the false negative rate were compared between the two groups. The repeat biopsy rate was determined by dividing the total number of core biopsies into the number of repeat biopsies. 'ADH underestimation' was defined as a lesion yielding atypical ductal hyperplasia on percutaneous biopsy and carcinoma at surgery, and 'DCIS underestimation' was defined as a lesion yielding ductal carcinoma in situ on percutaneous biopsy and invasive carcinoma at surgery. The repeat biopsy rate was 42% (27/65) for the 14-gauge automated gun biopsies and 9.1% (3/33) for the 11-gauge vacuum-assisted biopsies. The ADH underestimation rate was 50% (7/14) for the 14-gauge automated gun biopsies and 0% (0/4) for the 11-gauge vacuum-assisted biopsies. The DCIS underestimation was 14% (1/7) for the 14-gauge automated gun biopsies and 0% (0/2) for the 11-gauge vacuum-assisted biopsies. The false negative rate was 0% for these two groups. For the papillary lesions of the breast, the outcomes of the US-guided core biopsies performed with the 11-gauge vacuum-assisted device were better than those of the biopsies performed with the 14-gauge automated gun, in terms of underestimation and repeat biopsy

  11. Breast carcinoma in radiosurgery biopsy

    International Nuclear Information System (INIS)

    Cohen, Leonard O.; Brito, Pablo E.; Coppolecchia, German L.; Giarmana, Maria J.; Delle Ville, Rodolfo E.; Cortese, Eduardo M.

    2006-01-01

    Purpose: To report our experience on the detection of breast cancer (BC) through guided radiosurgical biopsies (GRSB) in the Gynecology Department of the Hospital Aeronautico Central (SGHAC). Materials and method: We retrospectively analyzed 622 GRSBs performed at the SGHAC between 1 January 1995 and 31 December 2004. We took into account single or associated lesions found in mammograms, which we subdivided into four types: 1) Non-palpable mammographic nodules; 2) Microcalcifications; 3) Structural distortions; 4) Mammographic asymmetries. Results: We found 332 non-palpable nodules (53.4%), 214 microcalcifications (34.4%), 40 structural distortions (6.4%), and 36 mammographic asymmetries (5.8%). Out of the 622 GRSBs performed during the above period, 152 BCs were diagnosed, that is, an incidence of 24.4% detected through this method. Out of the 152 BCs, 110 (72.4%) were invasive and 42 (27.6%) were noninvasive. Conclusions: Although 24.4% of BCs were identified through GRSBs, our tea m considers this to be the standard method for early detection of breast cancer. (author) [es

  12. [Is percutaneous liver biopsy using the Trucut (Travenol) needle superior to Menghini puncture?].

    Science.gov (United States)

    Judmaier, G; Prior, C; Klimpfinger, M; Bernklau, E; Vogel, W; Dietze, O; Denk, H

    1989-11-01

    The aim of this study was to compare the quality of biopsy cylinders obtained by the Menghini or Trucut liver biopsy-method as well as the frequency of complications observed with both these methods. For this purpose, 74 Menghini and 62 Trucut biopsies were analyzed. Both groups were comparable with respect to histologic diagnosis, but no final diagnosis could be made in eight cases of Menghini biopsy because of insufficiency of the material obtained. Fragmentation of the sample occurred significantly more often in the Menghini group (p less than 0.05; chi 2 test). Trucut biopsies were significantly longer (12 mm versus 8 mm mean value; p less than 0.001; Wilcoxon rank sum test) and contained significantly more portal tracts (16 versus 6 mean value; p less than 0.001). None of the total 136 biopsies led to serious complications. We conclude that Trucut liver biopsy is superior to the Menghini method since tissue yield is better and both methods are equally safe.

  13. High efficiency for prostate biopsy qualification with full-field OCT after training

    Science.gov (United States)

    Yang, C.; Ricco, R.; Sisk, A.; Duc, A.; Sibony, M.; Beuvon, F.; Dalimier, E.; Delongchamps, N. B.

    2016-02-01

    Full-field optical coherence tomography (FFOCT) offers a fast and non-destructive method of obtaining images of biological tissues at ultrahigh resolution, approaching traditional histological sections. In the context of prostate cancer diagnosis involving multiple biopsies, FFOCT could be used to validate the cores just after they are obtained in order to guide the number of biopsies to be performed. The aim of the study was to define and test a training protocol for efficient FFOCT prostate biopsy assessment. Three readers (a pathologist with previous experience with FFOCT, a pathologist new to FFOCT, and a urologist new to FFOCT) were trained to read FFOCT images of prostate biopsies on a set of 20 commented zooms (1 mm field of view) and 25 complete images. They were later tested on a set of 115 anonymized and randomized images of prostate biopsies. The results showed that an extra 30 images were necessary for more complete training as compared to prior studies. After training, pathologists obtained 100% sensitivity on high-grade cancer detection and 96% overall specificity; the urologist obtained 88% sensitivity on high-grade cancer and 89% overall specificity. Overall, the readers obtained a mean of 93% accuracy of qualifying malignancy on prostate biopsies. Moreover, the two pathologists showed a steeper learning curve than the urologist. This study demonstrates that a training protocol for such a new imaging modality may be implemented and yield very high efficiency for the pre-histologic detection of malignancy on prostate biopsies.

  14. Confounding factors in diagnostics of MGMT promoter methylation status in glioblastomas in stereotactic biopsies.

    Science.gov (United States)

    Weise, Lutz M; Harter, Patrick N; Eibach, Sebastian; Braczynski, Anne K; Dunst, Maika; Rieger, Johannes; Bähr, Oliver; Hattingen, Elke; Steinbach, Joachim P; Plate, Karl H; Seifert, Volker; Mittelbronn, Michel

    2014-01-01

    In nonresectable glioblastoma (GBM), stereotactic biopsies are performed to retrieve tissue for diagnostic purposes. The analysis of O6-methylguanine-DNA methyltransferase (MGMT) promoter methylation adds prognostic and predictive information. The aim of the study was to detect confounding factors that limit the number of conclusive MGMT promoter methylation results. We analyzed 71 consecutive GBM patients undergoing stereotactic biopsy on whom MGMT analysis was performed by methylation-specific polymerase chain reaction. Specimens were correlated to imaging by coregistration and prospective documentation of biopsy localization. Our findings were validated in an additional 62 GBM stereotactic biopsies. Our results demonstrate that the best MGMT promoter methylation results were obtained from samples (n = 71) taken in a tangential manner from tumor areas showing contrast enhancement in magnetic resonance imaging. In the additional validation series of 62 stereotactically biopsied GBM, we were able to increase the rate of conclusive MGMT promoter methylation results from 76.1 to 85.48% by strictly planning the route of biopsy in a tangential manner if possible. These results underline that within the contrast-enhanced tumor part, choosing the trajectory in a tangential manner increases the diagnostic yield for conclusive MGMT promoter methylation analyses in stereotactic biopsies as a basis for patient stratification and individualized therapy.

  15. MR cone-beam CT fusion image overlay for fluoroscopically guided percutaneous biopsies in pediatric patients.

    Science.gov (United States)

    Thakor, Avnesh S; Patel, Premal A; Gu, Richard; Rea, Vanessa; Amaral, Joao; Connolly, Bairbre L

    2016-03-01

    Lesions only visible on magnetic resonance (MR) imaging cannot easily be targeted for image-guided biopsy using ultrasound or X-rays but instead require MR guidance with MR-compatible needles and long procedure times (acquisition of multiple MR sequences). We developed an alternative method for performing these difficult biopsies in a standard interventional suite, by fusing MR with cone-beam CT images. The MR cone-beam CT fusion image is then used as an overlay to guide a biopsy needle to the target area under live fluoroscopic guidance. Advantages of this technique include (i) the ability for it to be performed in a conventional interventional suite, (ii) three-dimensional planning of the needle trajectory using cross-sectional imaging, (iii) real-time fluoroscopic guidance for needle trajectory correction and (iv) targeting within heterogeneous lesions based on MR signal characteristics to maximize the potential biopsy yield.

  16. Subungual hyperkeratosis nail biopsy: A better diagnostic tool for onychomycosis

    Directory of Open Access Journals (Sweden)

    Rahul Nagar

    2012-01-01

    Full Text Available Background: Onychomycosis is one of the most common nail disorders. Mycological examination by potassium hydroxide (KOH mount and fungal culture is the most commonly used diagnostic method. However, it is associated with a low sensitivity. Aims: To evaluate the technique of subungual hyperkeratosis nail biopsy in diagnosing onychomycosis in HIV-infected and immunocompetent adults and compare it with mycological examination. Methods: 34 HIV-positive patients who presented clinically with onychomycosis were recruited in the study from the beginning. There was no screening done for patients with onychomycosis. This has been clarified in manuscript under the heading of methods. Results: All the fungal cultures yielded dermatophytes correlating with the biopsy findings. Only hyphal form of fungus was detected in KOH examination, indicating it was not a contaminant. Clinical types of onychomycosis are stated in discussion. Conclusions: PAS stain of subungual hyperkeratosis nail biopsy was the most sensitive in the diagnosis of onychomycosis in both HIV-infected and non-infected groups.

  17. CT-guided percutaneous core needle biopsy in deep seated musculoskeletal lesions: a prospective study of 128 cases

    International Nuclear Information System (INIS)

    Puri, A.; Shingade, V.U.; Agarwal, M.G.; Anchan, C.; Juvekar, S.; Desai, S.; Jambhekar, N.A.

    2006-01-01

    Although large lesions of the limbs can easily be biopsied without image guidance, lesions in the spine, paraspinal area and pelvis are difficult to target, and benefit from CT guidance to improve the accuracy of targeting the lesion for biopsy purposes. A prospective study of CT-guided core needle biopsies for deep-seated musculoskeletal lesions was conducted at a referral cancer institute over a 4-year period with the aim of assessing the safety and efficacy of the procedure. From January 2000 to December 2003, 136 consecutive CT-guided biopsy sessions were undertaken for musculoskeletal lesions in 128 patients comprising 73 males and 55 females. The following data was recorded in all patients: demographic data, suspected clinicoradiological diagnosis, data related to core biopsy session (date, site, approach, total time required in minutes, number of cores, surgeon satisfaction with adequacy of cores), patient discomfort, complications, histopathology report and number of further sessions if material obtained during the first biopsy session was not confirmatory. The sample obtained during the biopsy session was considered inconclusive if, in the opinion of the pathologist, inadequate or non-representative tissue had been obtained. The diagnosis was considered inaccurate if the final histopathological diagnosis did not match with the biopsy diagnosis, or if subsequent clinicoradiological evaluation at follow up did not correlate with the biopsy diagnosis in those patients who were treated with modalities other than surgery. In 121 patients, a single session was sufficient to obtain representative material, whilst for six patients two sessions, and for one patient three sessions were necessary. The time taken for biopsy, including the pre-biopsy CT examination time, varied from 15 min to 60 min (median 30 min). For 110 bony lesions 116 sessions were required, and for 18 soft-tissue lesions 20 sessions were required. 108 biopsy sessions yielded a diagnosis, whilst

  18. Clamped end conditions and cross section deformation in the finite element absolute nodal coordinate formulation

    International Nuclear Information System (INIS)

    Hussein, Bassam A.; Weed, David; Shabana, Ahmed A.

    2009-01-01

    In the finite element absolute nodal coordinate formulation (ANCF), the elimination of the relative translations and rotations at a point does not necessarily define a fully clamped joint, particularly in the case of fully parameterized ANCF finite elements that allow for the deformation of the cross section. In this investigation, the formulations and results of two different sets of clamped end conditions that define two different joints are compared. The first joint, called the partially clamped joint, eliminates only the translations and rotations at a point on the cross section. The second joint, called the fully clamped joint, eliminates all the translation, rotation and deformation degrees of freedom at a point on the cross section. The kinematic equations that define the partially and fully clamped joints are developed, and the dynamic equations used in the comparative numerical study presented in this paper are shown. As discussed in this investigation, the fully clamped joint does not allow for the deformation of the cross section at the joint node since the gradient vectors remain orthogonal unit vectors. The partially clamped joint, on the other hand, allows for the deformation of the cross section. Nanson's formula is used as a measure of the deformation of the cross section in the case of the partially clamped joint. A very flexible pendulum that has a rigid body attached to its free end is used to compare the results of the partially and fully clamped joints. The numerical results obtained using this very flexible pendulum example show that, while the type of joint (partially or fully clamped) does not significantly affect the gross reference motion of the system, there are fundamental differences between the two joints since the partially clamped joint allows for the cross section deformations at the joint node

  19. Renal Vascular Clamp Placement: A Potential Cause of Incomplete Hilar Control during Partial Nephrectomy.

    Science.gov (United States)

    Tryon, David; Myklak, Kristene; Alsyouf, Muhannad; Conceicao, Carol; Peplinski, Brandon; Arenas, Javier L; Faaborg, Daniel; Ruckle, Herbert C; Baldwin, D Duane

    2016-03-01

    Previous benchtop studies have shown that robotic bulldog clamps provide incomplete vascular control of a Penrose drain. We determined the efficacy of robotic and laparoscopic bulldog clamps to ensure hemostasis on the human renal artery. The effect of clamp position on vascular control was also examined. Fresh human cadaveric renal arteries were used to determine the leak point pressure of 7 bulldog clamps from a total of 3 manufacturers. Five trials were performed per clamp at 4 locations, including the fulcrum, proximal, middle and distal positions. Comparison was done using the Kruskal-Wallis test with p clamps leaked at a pressure less than 215 mm Hg when applied at the proximal, middle or distal position. In general leak point pressure decreased as the artery was positioned more distal along the clamp. The exception was when the vessel was placed at the fulcrum position. At that position 80% to 100% of trials with the Klein laparoscopic, 100% with the Klein robotic (Klein Robotic, San Antonio, Texas) and 60% to 80% with the Scanlan robotic (Scanlan International, Saint Paul, Minnesota) clamp leaked at pressure below 215 mm Hg. Each vascular clamp adequately occluded flow at physiological pressure when placed at the proximal, middle or distal position. Furthermore, these results demonstrate that there is leakage at physiological pressure when the artery is placed at the fulcrum of certain clamp types. These results suggest that applying a bulldog clamp at the fulcrum could potentially lead to inadequate vessel occlusion and intraoperative bleeding. Copyright © 2016 American Urological Association Education and Research, Inc. Published by Elsevier Inc. All rights reserved.

  20. Electrothermally actuated tunable clamped-guided resonant microbeams

    KAUST Repository

    Alcheikh, Nouha

    2017-06-11

    We present simulation and experimental investigation demonstrating active alteration of the resonant and frequency response behavior of resonators by controlling the electrothermal actuation method on their anchors. In-plane clamped-guided arch and straight microbeams resonators are designed and fabricated with V-shaped electrothermal actuators on their anchors. These anchors not only offer various electrothermal actuation options, but also serve as various mechanical stiffness elements that affect the operating resonance frequency of the structures. We have shown that for an arch, the first mode resonance frequency can be increased up to 50% of its initial value. For a straight beam, we have shown that before buckling, the resonance frequency decreases to very low values and after buckling, it increases up to twice of its initial value. These results can be promising for the realization of different wide–range tunable microresonator. The experimental results have been compared to multi-physics finite-element simulations showing good agreement among them.

  1. Conserved residues in the delta subunit help the E. coli clamp loader, gamma complex, target primer-template DNA for clamp assembly.

    Science.gov (United States)

    Chen, Siying; Coman, Maria Magdalena; Sakato, Miho; O'Donnell, Michael; Hingorani, Manju M

    2008-06-01

    The Escherichia coli clamp loader, gamma complex (gamma(3)deltadelta'lambdapsi), catalyzes ATP-driven assembly of beta clamps onto primer-template DNA (p/tDNA), enabling processive replication. The mechanism by which gamma complex targets p/tDNA for clamp assembly is not resolved. According to previous studies, charged/polar amino acids inside the clamp loader chamber interact with the double-stranded (ds) portion of p/tDNA. We find that dsDNA, not ssDNA, can trigger a burst of ATP hydrolysis by gamma complex and clamp assembly, but only at far higher concentrations than p/tDNA. Thus, contact between gamma complex and dsDNA is necessary and sufficient, but not optimal, for the reaction, and additional contacts with p/tDNA likely facilitate its selection as the optimal substrate for clamp assembly. We investigated whether a conserved sequence-HRVW(279)QNRR--in delta subunit contributes to such interactions, since Tryptophan-279 specifically cross-links to the primer-template junction. Mutation of delta-W279 weakens gamma complex binding to p/tDNA, hampering its ability to load clamps and promote proccessive DNA replication, and additional mutations in the sequence (delta-R277, delta-R283) worsen the interaction. These data reveal a novel location in the C-terminal domain of the E. coli clamp loader that contributes to DNA binding and helps define p/tDNA as the preferred substrate for the reaction.

  2. Transvenous liver biopsy via the femoral vein

    International Nuclear Information System (INIS)

    Khosa, F.; McNulty, J.G.; Hickey, N.; O'Brien, P.; Tobin, A.; Noonan, N.; Ryan, B.; Keeling, P.W.N.; Kelleher, D.P.; McDonald, G.S.A.

    2003-01-01

    AIM: To study the safety, effectiveness and diagnostic value of transvenous forceps biopsy of the liver in 54 patients with coagulopathy, gross ascites or morbid obesity and suspected liver disease in whom percutaneous liver biopsy was contraindicated. MATERIAL AND METHODS: Forceps biopsy of the liver via the femoral vein was attempted in 54 adult patients with advanced liver disease of unknown aetiology who had coagulation disorders (41 cases), gross ascites (11 cases) or morbid obesity (two cases). In each patient two to six biopsies (average four) were taken using a radial jaw forceps inserted via the right or left femoral vein. RESULTS: The procedure was successful in 53 cases. Hepatic vein catheterization failed in one patient. Adequate liver tissue for diagnosis was obtained in 84% of cases. One patient developed delayed haemorrhage at 12 h from a capsular leak that was undetected during the biopsy procedure. This patient required blood transfusions and laparotomy to control bleeding. There were no deaths in the 53 patients studied. Transient minor chest and shoulder pain was encountered during sheath insertion into a hepatic vein in 23 patients. Three patients developed a femoral vein haematoma, which resolved with conservative treatment. CONCLUSION: Transvenous liver biopsy via the femoral vein is another safe, effective, simple alternative technique of biopsy when the percutaneous route is contraindicated

  3. Prevention of sepsis prior to prostate biopsy

    Directory of Open Access Journals (Sweden)

    Liam Toner

    2016-03-01

    Full Text Available Purpose: Urosepsis is the most feared complication of transrectal prostate biopsy. The incidence may be increasing from <1% to 2%–3% in contemporary series. Historically, fluoroquinolones have been effective antibiotic prophylaxis to prevent infective complications but antibiotic resistance is increasing. The increase in antibiotic resistance may contribute to reported increases in urosepsis and hospitalization after transrectal biopsy. This article will review other methods clinicians may employ to reduce the incidence of infective complications after prostate biopsy. Materials and Methods: A systematic review of the literature was conducted using literature databases PubMed and Ovid MEDLINE in August 2015 in accordance with the PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-analyses criteria. Results: Effective strategies to reduce infective complications after transrectal prostate biopsy include augmented prophylaxis with other antibiotics, rectal swab culture directed antibiotic prophylaxis or a transperineal biopsy approach. Needle disinfection, minimizing the number of biopsy needles and rectal disinfectants may also be of use. These methods may be of particular utility in patients with risk factors for developing urosepsis such as recent antibiotic use and overseas travel. Conclusions: The scientific literature describes various techniques designed to reduce infective complications caused by prostate biopsy. Clinicians should consider incorporating these novel techniques into their contemporary practice.

  4. Estimation of endogenous glucose production during hyperinsulinemic-euglycemic glucose clamps. Comparison of unlabeled and labeled exogenous glucose infusates

    International Nuclear Information System (INIS)

    Finegood, D.T.; Bergman, R.N.; Vranic, M.

    1987-01-01

    Tracer methodology has been applied extensively to the estimation of endogenous glucose production (Ra) during euglycemic glucose clamps. The accuracy of this approach has been questioned due to the observation of significantly negative estimates for Ra when insulin levels are high. We performed hyperinsulinemic (300 microU/ml)-euglycemic glucose clamps for 180 min in normal dogs and compared the standard approach, an unlabeled exogenous glucose infusate (cold GINF protocol, n = 12), to a new approach in which a tracer (D-[3- 3 H]glucose) was added to the exogenous glucose used for clamping (hot GINF protocol, n = 10). Plasma glucose, insulin and glucagon concentrations, and glucose infusion rates were similar for the two protocols. Plasma glucose specific activity was 20 +/- 1% of basal (at 120-180 min) in the cold GINF studies, and 44 +/- 3 to 187 +/- 5% of basal in the hot GINF studies. With the one-compartment, fixed pool volume model of Steele, Ra for the cold GINF studies was -2.4 +/- 0.7 mg X min-1 X kg-1 at 25 min and remained significantly negative until 110 min (P less than .05). For the hot GINF studies, Ra was never significantly less than zero (P greater than .05) and was greater than in the cold GINF studies at 20-90 min (P less than .05). There was substantially less between-(78%) and within- (40%) experiment variation for the hot GINF studies compared with the cold GINF studies. An alternate approach (regression method) to the application of the one-compartment model, which allows for a variable and estimable effective distribution volume, yielded Ra estimates that were suppressed 60-100% from basal

  5. Crystal structure of DNA polymerase III β sliding clamp from Mycobacterium tuberculosis.

    Science.gov (United States)

    Gui, Wen-Jun; Lin, Shi-Qiang; Chen, Yuan-Yuan; Zhang, Xian-En; Bi, Li-Jun; Jiang, Tao

    2011-02-11

    The sliding clamp is a key component of DNA polymerase III (Pol III) required for genome replication. It is known to function with diverse DNA repair proteins and cell cycle-control proteins, making it a potential drug target. To extend our understanding of the structure/function relationship of the sliding clamp, we solved the crystal structure of the sliding clamp from Mycobacterium tuberculosis (M. tuberculosis), a human pathogen that causes most cases of tuberculosis (TB). The sliding clamp from M. tuberculosis forms a ring-shaped head-to-tail dimer with three domains per subunit. Each domain contains two α helices in the inner ring that lie against two β sheets in the outer ring. Previous studies have indicated that many Escherichia coli clamp-binding proteins have a conserved LF sequence, which is critical for binding to the hydrophobic region of the sliding clamp. Here, we analyzed the binding affinities of the M. tuberculosis sliding clamp and peptides derived from the α and δ subunits of Pol III, which indicated that the LF motif also plays an important role in the binding of the α and δ subunits to the sliding clamp of M. tuberculosis. Copyright © 2011 Elsevier Inc. All rights reserved.

  6. Application of active electrode compensation to perform continuous voltage-clamp recordings with sharp microelectrodes.

    Science.gov (United States)

    Gómez-González, J F; Destexhe, A; Bal, T

    2014-10-01

    Electrophysiological recordings of single neurons in brain tissues are very common in neuroscience. Glass microelectrodes filled with an electrolyte are used to impale the cell membrane in order to record the membrane potential or to inject current. Their high resistance induces a high voltage drop when passing current and it is essential to correct the voltage measurements. In particular, for voltage clamping, the traditional alternatives are two-electrode voltage-clamp technique or discontinuous single electrode voltage-clamp (dSEVC). Nevertheless, it is generally difficult to impale two electrodes in a same neuron and the switching frequency is limited to low frequencies in the case of dSEVC. We present a novel fully computer-implemented alternative to perform continuous voltage-clamp recordings with a single sharp-electrode. To reach such voltage-clamp recordings, we combine an active electrode compensation algorithm (AEC) with a digital controller (AECVC). We applied two types of control-systems: a linear controller (proportional plus integrative controller) and a model-based controller (optimal control). We compared the performance of the two methods to dSEVC using a dynamic model cell and experiments in brain slices. The AECVC method provides an entirely digital method to perform continuous recording and smooth switching between voltage-clamp, current clamp or dynamic-clamp configurations without introducing artifacts.

  7. A structural and mechanistic study of π-clamp-mediated cysteine perfluoroarylation.

    Science.gov (United States)

    Dai, Peng; Williams, Jonathan K; Zhang, Chi; Welborn, Matthew; Shepherd, James J; Zhu, Tianyu; Van Voorhis, Troy; Hong, Mei; Pentelute, Bradley L

    2017-08-11

    Natural enzymes use local environments to tune the reactivity of amino acid side chains. In searching for small peptides with similar properties, we discovered a four-residue π-clamp motif (Phe-Cys-Pro-Phe) for regio- and chemoselective arylation of cysteine in ribosomally produced proteins. Here we report mutational, computational, and structural findings directed toward elucidating the molecular factors that drive π-clamp-mediated arylation. We show the significance of a trans conformation prolyl amide bond for the π-clamp reactivity. The π-clamp cysteine arylation reaction enthalpy of activation (ΔH ‡ ) is significantly lower than a non-π-clamp cysteine. Solid-state NMR chemical shifts indicate the prolyl amide bond in the π-clamp motif adopts a 1:1 ratio of the cis and trans conformation, while in the reaction product Pro3 was exclusively in trans. In two structural models of the perfluoroarylated product, distinct interactions at 4.7 Å between Phe1 side chain and perfluoroaryl electrophile moiety are observed. Further, solution 19 F NMR and isothermal titration calorimetry measurements suggest interactions between hydrophobic side chains in a π-clamp mutant and the perfluoroaryl probe. These studies led us to design a π-clamp mutant with an 85-fold rate enhancement. These findings will guide us toward the discovery of small reactive peptides to facilitate abiotic chemistry in water.

  8. Diuretic response to acute hypertension is blunted during angiotensin II clamp

    DEFF Research Database (Denmark)

    Leong, Patrick K K; Zhang, Yibin; Yang, Li E

    2002-01-01

    and endogenous lithium clearance increased two- and threefold, respectively. We conclude that HOE-140, an inhibitor of the B(2) receptor, potentiates the sensitivity of arterial pressure to ANG II and that clamping systemic ANG II levels during acute hypertension blunts the magnitude of the pressure diuretic...... whether the suppression of the renin-angiotensin system during acute hypertension affects the magnitude of the inhibition of PT fluid and sodium reabsorption, plasma ANG II levels were clamped by infusion of the angiotensin-converting enzyme (ACE) inhibitor captopril (12 microg/min) and ANG II after...... ("ANG II clamp"). When blood pressure was acutely increased 50-60 mmHg by arterial constriction without ANG II clamp, urine output and endogenous lithium clearance increased 4.0- and 6.7-fold, respectively. With ANG II clamp, the effects of acute hypertension were reduced 50%: urine output...

  9. A reduction clamp for an aiming component in associated acetabular fractures

    Directory of Open Access Journals (Sweden)

    Zhang-Fu Wang

    2015-01-01

    Full Text Available Background: The treatment of acetabular fractures is complex and requires specialized equipment. However, all currently available instruments have some disadvantages. A new reduction clamp that can firmly enable reduction and not hinder subsequent fixation procedures for some special fracture types is needed. Materials and Methods: In this study, we introduce a new acetabular clamp and its preliminary clinical application in three T-shaped acetabular fractures. Results: This new clamp can successfully pull the posterior column back to the anterior column and firmly maintain the reduction. This clamp′s aiming plate can facilitate the insertion of long lag screws. The clamp is also easy to assemble and use. Conclusion: This reduction clamp is a useful instrument that can facilitate open reduction and internal fixation of acetabular fractures.

  10. On the mechanism of loading the PCNA sliding clamp by RFC.

    Science.gov (United States)

    Dionne, Isabelle; Brown, Nicola J; Woodgate, Roger; Bell, Stephen D

    2008-04-01

    Sliding clamps play central roles in a broad range of DNA replication and repair processes. The clamps form circular molecules that must be opened and resealed around DNA by the clamp loader complex to fulfil their function. While most eukaryotes and many archea possess a homo-trimeric PCNA, the PCNA of Sulfolobus solfataricus is a heterotrimer. Here, we exploit the asymmetry of S. solfataricus PCNA to create a series of circularly permuted PCNA subunit fusions, thereby covalently closing defined interfaces within the heterotrimer. Using these concatamers, we investigate the requirements for loading the clamp onto DNA and reveal that a single defined interface within the heterotrimer is opened during the loading process. Subunit-specific interactions between S. solfataricus RFC clamp loader and PCNA permit us to superimpose our data upon the structure of yeast RFC-PCNA complex, thereby presenting a general model for PCNA loading by RFC in archaea and eukaryotes.

  11. Ultrasound-Guided Fine Needle Aspiration Biopsy of the Thyroid

    Science.gov (United States)

    ... Physician Resources Professions Site Index A-Z Ultrasound-Guided Fine Needle Aspiration Biopsy of the Thyroid An ... Aspiration Biopsy of the Thyroid? What is Ultrasound-Guided Fine Needle Aspiration Biopsy of the Thyroid? During ...

  12. Radial scars without atypia in percutaneous biopsy specimens: can they obviate surgical biopsy?

    Science.gov (United States)

    Mesa-Quesada, J; Romero-Martín, S; Cara-García, M; Martínez-López, A; Medina-Pérez, M; Raya-Povedano, J L

    To evaluate the need for surgical biopsy in patients diagnosed with radial scars without atypia by percutaneous biopsy. In this retrospective observational study, we selected patients with a histological diagnosis of radial scar in specimens obtained by percutaneous biopsy during an 8-year period. The statistical analysis was centered on patients with radial scar without atypia (we assessed the radiologic presentation, the results of the percutaneous biopsy, and their correlation with the results of surgical biopsy and follow-up) and we added the patients with atypia and cancer in the elaboration of the diagnostic indices. We identified 96 patients with radial scar on percutaneous biopsy; 54 had no atypia, 18 had atypia, and 24 had cancer. Among patients with radial scar without atypia, there were no statistically significant differences between patients who underwent imaging follow-up and those who underwent surgical biopsy (p>0.05). The rate of underdiagnosis for percutaneous biopsy in patients without atypia was 1.9%. The rates of diagnosis obtained with percutaneous biopsy in relation to follow-up and surgical biopsy in the 96 cases were sensitivity 92.3%, specificity 100%, positive predictive value 100%, negative predictive value 97.2%, and accuracy 97.9%. The area under the ROC curve was 0.96 (p<0.001), and the kappa concordance index was 0.95 (p<0.001) CONCLUSIONS: We consider that it is not necessary to perform surgical biopsies in patients with radial scars without atypia on percutaneous biopsies because the rate of underestimation is very low and the concordance between the diagnosis reached by percutaneous biopsy and the definitive diagnosis is very high. Copyright © 2017 SERAM. Publicado por Elsevier España, S.L.U. All rights reserved.

  13. Prostate Magnetic Resonance Imaging and Magnetic Resonance Imaging Targeted Biopsy in Patients with a Prior Negative Biopsy: A Consensus Statement by AUA and SAR.

    Science.gov (United States)

    Rosenkrantz, Andrew B; Verma, Sadhna; Choyke, Peter; Eberhardt, Steven C; Eggener, Scott E; Gaitonde, Krishnanath; Haider, Masoom A; Margolis, Daniel J; Marks, Leonard S; Pinto, Peter; Sonn, Geoffrey A; Taneja, Samir S

    2016-12-01

    After an initial negative biopsy there is an ongoing need for strategies to improve patient selection for repeat biopsy as well as the diagnostic yield from repeat biopsies. As a collaborative initiative of the AUA (American Urological Association) and SAR (Society of Abdominal Radiology) Prostate Cancer Disease Focused Panel, an expert panel of urologists and radiologists conducted a literature review and formed consensus statements regarding the role of prostate magnetic resonance imaging and magnetic resonance imaging targeted biopsy in patients with a negative biopsy, which are summarized in this review. The panel recognizes that many options exist for men with a previously negative biopsy. If a biopsy is recommended, prostate magnetic resonance imaging and subsequent magnetic resonance imaging targeted cores appear to facilitate the detection of clinically significant disease over standardized repeat biopsy. Thus, when high quality prostate magnetic resonance imaging is available, it should be strongly considered for any patient with a prior negative biopsy who has persistent clinical suspicion for prostate cancer and who is under evaluation for a possible repeat biopsy. The decision of whether to perform magnetic resonance imaging in this setting must also take into account the results of any other biomarkers and the cost of the examination, as well as the availability of high quality prostate magnetic resonance imaging interpretation. If magnetic resonance imaging is done, it should be performed, interpreted and reported in accordance with PI-RADS version 2 (v2) guidelines. Experience of the reporting radiologist and biopsy operator are required to achieve optimal results and practices integrating prostate magnetic resonance imaging into patient care are advised to implement quality assurance programs to monitor targeted biopsy results. Patients receiving a PI-RADS assessment category of 3 to 5 warrant repeat biopsy with image guided targeting. While

  14. CO2 Clamping, Peripheral and Central Fatigue during Hypoxic Knee Extensions in Men.

    Science.gov (United States)

    Rupp, Thomas; Mallouf, Thibault Le Roux; Perrey, Stéphane; Wuyam, Bernard; Millet, Guillaume Y; Verges, Samuel

    2015-12-01

    The central nervous system can play a critical role in limiting exercise performance during hypoxic conditions. Hypocapnia, which is associated with hypoxia-induced hyperventilation, may affect cerebral perfusion. We hypothesized that CO2 clamping during hypoxic isometric knee extensions would improve cerebral oxygenation and reduce central fatigue. Fifteen healthy men (mean ± SD: age, 25 ± 8 yr; body mass, 72 ± 11 kg; height, 179 ± 7 cm) performed intermittent isometric knee extensions at ∼50% of maximal voluntary contraction to task failure in normoxia, hypoxia with CO2 clamping (arterial O2 saturation, 80% ± 2%; end-tidal CO2 partial pressure, 40 ± 2 mm Hg), and hypoxia without CO2 clamping (arterial O2 saturation, 80% ± 3%). Transcranial magnetic stimulation and femoral nerve electrical stimulation were used to assess central and peripheral determinants of fatigue. Prefrontal cortex and quadriceps femoris oxygenation were monitored by multichannel near-infrared spectroscopy. Exercise duration was reduced to a similar extent in hypoxia with CO2 clamping (997 ± 460 s) or hypoxia without CO2 clamping (929 ± 412 s) compared to normoxia (1473 ± 876 s; P stimulation maximal voluntary activation decreased to a greater extent at task failure in hypoxia without CO2 clamping (-18% ± 8%) compared to hypoxia with CO2 clamping (-9% ± 9%; P < 0.01) and normoxia (-10% ± 7%; P < 0.05). Conversely, exercise-induced peripheral fatigue was larger in hypoxia with CO2 clamping than in hypoxia without CO2 clamping (e.g., Db10-to-Db100 ratio of 0.54 ± 0.12 and 0.63 ± 0.11 at task failure, respectively; P < 0.05). The results demonstrate that CO2 clamping can alter central and peripheral mechanisms that contribute to neuromuscular fatigue during hypoxic isometric knee extensions in men. Hypocapnia impairs cerebral oxygenation and central drive but exerts a protective effect against fatigability in muscles.

  15. Escherichia coli processivity clamp β from DNA polymerase III is dynamic in solution†

    Science.gov (United States)

    Fang, Jing; Engen, John R.; Beuning, Penny J.

    2011-01-01

    Escherichia coli DNA polymerase III is a highly processive replicase due to the presence of the β clamp protein that tethers DNA polymerases to DNA. The β clamp is a head-to-tail ring-shaped homodimer, in which each protomer contains three structurally similar domains. Although multiple studies have probed the functions of the β clamp, a detailed understanding of the conformational dynamics of the β clamp in solution is lacking. Here we used hydrogen exchange mass spectrometry to characterize the conformation and dynamics of the intact dimer β clamp and a variant form (I272A/L273A) with diminished ability to dimerize in solution. Our data indicate that the β clamp is not a static closed ring but rather is dynamic in solution. The three domains showed different dynamics though they share a highly similar tertiary structure. Domain I, which controls the opening of the clamp by dissociating from Domain III, contained several highly flexible peptides that underwent partial cooperative unfolding (EX1 kinetics) with a half-life ~4 h. The comparison between the β monomer variant and the wild-type β clamp showed that the β monomer was more dynamic. In the monomer, partial unfolding was much faster and additional regions of Domain III also underwent partial unfolding with a half-life ~1 h. Our results suggest that the δ subunit of the clamp loader may function as a “ring holder” to stabilize the transient opening of the β clamp, rather than as a “ring opener”. PMID:21657794

  16. Ultrasound-guided Lung Biopsy in the Hands of Respiratory Physicians

    DEFF Research Database (Denmark)

    Laursen, Christian B.; Naur, Therese M.H.; Bodtger, Uffe

    2016-01-01

    in which a primary USTTNAB had been performed were identified. The most common biopsy sites were lungs and pleurae with a total of 164 (76.3%) patients and 31 patients (14.4%), respectively. US-TTNAB diagnostic yield was 76.9% (95% CI, 70.3%-83.4%) for malignant diagnoses and 47.6% (95% CI, 31...

  17. GoM Coastal Biopsy Surveys - NRDA

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Small vessel surveys were conducted within estuarine and nearshore coastal waters of Barataria Bay, LA and Mississippi Sound, MS to collect tissue biopsy samples...

  18. Incision for pleural tissue biopsy (image)

    Science.gov (United States)

    ... open pleural biopsy, a small piece of the pleural tissue is removed through a surgical incision in the chest. After the sample is obtained, a chest tube is placed and the incision is closed with ...

  19. Effects of Delayed Umbilical Cord Clamping vs Early Clamping on Anemia in Infants at 8 and 12 Months: A Randomized Clinical Trial.

    Science.gov (United States)

    Kc, Ashish; Rana, Nisha; Målqvist, Mats; Jarawka Ranneberg, Linda; Subedi, Kalpana; Andersson, Ola

    2017-03-01

    Delayed umbilical cord clamping has been shown to improve iron stores in infants to 6 months of age. However, delayed cord clamping has not been shown to prevent iron deficiency or anemia after 6 months of age. To investigate the effects of delayed umbilical cord clamping, compared with early clamping, on hemoglobin and ferritin levels at 8 and 12 months of age in infants at high risk for iron deficiency anemia. This randomized clinical trial included 540 late preterm and term infants born vaginally at a tertiary hospital in Kathmandu, Nepal, from October 2 to November 21, 2014. Follow-up included blood levels of hemoglobin and ferritin at 8 and 12 months of age. Follow-up was completed on December 11, 2015. Analysis was based on intention to treat. Infants were randomized to delayed umbilical cord clamping (≥180 seconds after delivery) or early clamping (≤60 seconds after delivery). Main outcomes included hemoglobin and anemia levels at 8 months of age with the power estimate based on the prevalence of anemia. Secondary outcomes included hemoglobin and anemia levels at 12 months of age and ferritin level, iron deficiency, and iron deficiency anemia at 8 and 12 months of age. In this study of 540 infants (281 boys [52.0%] and 259 girls [48.0%]; mean [SD] gestational age, 39.2 [1.1] weeks), 270 each were randomized to the delayed and early clamping groups. At 8 months of age, 212 infants (78.5%) from the delayed group and 188 (69.6%) from the early clamping group returned for blood sampling. After multiple imputation analysis, infants undergoing delayed clamping had higher levels of hemoglobin (10.4 vs 10.2 g/dL; difference, 0.2 g/dL; 95% CI, 0.1 to 0.4 g/dL). Delayed cord clamping also reduced the prevalence of anemia (hemoglobin level infants (relative risk, 0.89; 95% CI, 0.81-0.98; number needed to treat [NNT], 11; 95% CI, 6-54). At 8 months, the risk for iron deficiency was reduced in the delayed clamping group in 60 (22.2%) vs 103 (38.1%) patients

  20. Colon Biopsy Findings of Renal Transplant Patients.

    Science.gov (United States)

    Taştepe, Firdevs Zeynep; Özgün, Gonca; Özdemir, Binnaz Handan; Tepeoğlu, Merih; Haberal, Mehmet

    2016-11-01

    The purpose of this study was to evaluate colonic pathologies in renal transplant recipients. Patients with colon biopsies were selected from 1816 renal transplant recipients from January 1990 to December 2012 at Baskent University Hospital (Ankara, Turkey). Demographic and clinical findings with colon biopsies were examined. There were 84 patients who had colon biopsies after renal transplant. There were 57 male and 27 female patients (median age at renal transplant was 33 y). Chronic diarrhea was the most common clinical finding at the time of colon biopsy. The median interval from renal transplant to first colon biopsy was 48.1 ± 47.5 months. On microscopic evaluation, there were no pathologic changes in 17 patients. The remaining 67 patients had colitis (38 patients), polyps (17 patients), cytomegalovirus colitis (8 patients), and amyloidosis (4 patients). The mean interval between transplant and the diagnosis of colitis was 49.08 ± 42.6 months, amyloidosis was 47.5 ± 79.28 months, cytomegalovirus colitis was 5 ± 3.5 months, and polyps was 77.65 ± 58.8 months. There was a statistically significant difference between biopsy diagnosis and the time interval between transplant and colon biopsy (P colonic biopsies, 40 patients never had acute rejection episodes and 44 patients had at least 1 acute rejection episode. Seven of 8 patients with cytomegalovirus colitis, 19 of 38 with colitis, 3 of 4 with amyloidosis, and 5 of 17 with polyps had acute rejection episodes. In our report on colonic manifestations in renal transplant recipients, the most common colonic lesion was noninfectious colitis. Cytomegalovirus colitis is an important infection that affects immunosuppressed individuals, such as transplant recipients. Cytomegalovirus must be kept in mind, and thorough sectioning and immunohistochemical sta ining should be used if necessary in the presence of any clinical or histologic suspicion for infective colitis.

  1. Ionic dependence of active Na-K transport: clamping of cellular Na+ with monensin

    International Nuclear Information System (INIS)

    Haber, R.S.; Pressley, T.A.; Loeb, J.N.; Ismail-Beigi, F.

    1987-01-01

    The Na + ionophore monensin was used to study the Na + - and K + -dependence of ouabain-inhibitable 86 Rb + uptake in ARL 15 cells, a rat liver cell line. Graded concentrations of monensin rapidly induced incremental elevations of cellular Na + that were stable for up to 2 h. In experiments in which cellular Na + was thus clamped at various levels, the activation curve for ouabain-inhibitable 86 Rb + uptake as a function of intracellular Na + was found to be steepest near basal Na + levels (Hill coefficient /congruent/ 2.4), indicating that these cells can respond to relatively large changes in passive Na + entry by increasing the rate of Na-K pump function with only minimal increases in cellular Na + . Exposure of cells to monensin also permitted examination of the extracellular-K + dependence of ouabain inhibitable 86 Rb + uptake in presence of saturating intracellular Na + and yielded a Hill coefficient of ∼ 1.5. The rate of ATP hydrolysis calculated from measurements of the maximal rate of ouabain-inhibitable 86 Rb + uptake in intact cells was similar to the enzymatic V/sub max/ of the Na + -K + -ATPase in cell lysates, suggesting that the Na + -K + -ATPase activity in these broken-cell preparations closely reflects the functional transport capacity of the Na-K pump

  2. A randomised pilot study comparing 13 G vacuum-assisted biopsy and conventional 14 G core needle biopsy of axillary lymph nodes in women with breast cancer

    International Nuclear Information System (INIS)

    Maxwell, A.J.; Bundred, N.J.; Harvey, J.; Hunt, R.; Morris, J.; Lim, Y.Y.

    2016-01-01

    Aim: To compare the acceptability, safety, and feasibility of vacuum-assisted biopsy (VAB) and core needle biopsy (CNB) of axillary lymph nodes in women with breast cancer. Materials and methods: This parallel, non-blinded, randomised study was approved by the National Research Ethics Service. Following written informed consent, women with abnormal appearing axillary lymph nodes and radiologically malignant breast masses were randomised 1:1 to lymph node sampling under local anaesthetic with either 14 G CNB or 13 G VAB in a single UK centre. Primary outcomes were study uptake rate and patient willingness to undergo a repeat procedure if necessary. Procedure duration, immediate and post-procedure pain scores, diagnostic yield, complications, and surgical histopathology were recorded. Results: Ninety-five women were approached; 81 (85.3%) consented and were randomised. Forty underwent CNB; 40 underwent VAB; one was excluded. Median age was 57 years. The median procedure time was 2 minutes for both techniques. The median number of samples obtained was three for CNB and four for VAB. Median pain scores for the procedure and first 3 days were 1/10 and 1/10 for CNB and 1/10 and 2/10 for VAB (p=0.11 and 0.04). More women were prepared to undergo repeat CNB compared to VAB, but the difference was not significant (38/39 versus 33/39; p=0.11). Two patients developed a haematoma after VAB. One CNB and six VABs failed to yield adequate tissue (p=0.11), but the sensitivity was similar at 79% and 78%. Conclusion: Study uptake was high. Acceptability of the two procedures was similar, but VAB was associated with more post-procedure pain. The sensitivity appears to be similar. - Highlights: • Vacuum biopsy of axillary lymph nodes can be performed rapidly. • Post-procedure pain was slightly higher in women who underwent vacuum biopsy. • The inadequate yield rate of vacuum biopsy may be higher than that for core biopsy. • Sensitivity of 13-gauge vacuum biopsy and 14-gauge

  3. Cryopreservation of biopsied cleavage stage human embryos.

    Science.gov (United States)

    Stachecki, James J; Cohen, Jacques; Munné, Santiago

    2005-12-01

    The aim was to develop a method to optimize cryopreservation of biopsied multi-celled human embryos. Human day 3 embryos that were donated to research, along with those found to be chromosomally abnormal after blastomere biopsy and fluorescence in-situ hyridization (FISH), were cryopreserved using a slow-freezing protocol in either standard embryo cryopreservation solution [embryo transfer freezing medium (ETFM), a conventional sodium-based medium] or CJ3 (a choline-based, sodium-free medium). After thawing, the number of intact cells was recorded and the previously biopsied embryos were re-analysed using FISH. Biopsied embryos had a lower proportion of intact blastomeres after cryopreservation as compared with intact embryos. However, a significantly (P < 0.05) higher proportion of blastomeres from intact and biopsied embryos cryopreserved in CJ3 (84.1 and 80.1% respectively) survived after thaw than those in ETFM (73.6 and 50.5% respectively). The proportion of aneuploid and mosaic embryos was not statistically different between the two groups. In addition, the frequency of lost cells by aneuploid and mosaic embryos was similar. This study describes a new method that improves the survival of cryopreserved biopsied embryos, and shows that it may also be beneficial for the storage of intact human multi-celled embryos.

  4. Indications for kidney biopsy in idiopathic childhood nephrotic syndrome.

    Science.gov (United States)

    Alshami, Alanoud; Roshan, Abishek; Catapang, Marisa; Jöbsis, Jasper J; Kwok, Trevor; Polderman, Nonnie; Sibley, Jennifer; Sibley, Matt; Mammen, Cherry; Matsell, Douglas G

    2017-10-01

    Most cases of childhood nephrotic syndrome (NS) are due to minimal change disease (MCD), while a minority of children have focal segmental glomerulosclerosis (FSGS) and an unfavorable clinical course, requiring a kidney biopsy to confirm diagnosis. We hypothesized that clinical characteristics at diagnosis and initial response to corticosteroid treatment accurately predict FSGS and can be used to guide consistent practice in the indications for kidney biopsy. This was a case control study (1990-2012). Inclusion criteria included age 1-17 years, meeting the diagnostic criteria for NS, and having biopsy-proven FSGS or MCD. Clinical characteristics at diagnosis included age, kidney function [estimated glomerular filtration rate (eGFR)], hypertension, hematuria, nephritis (reduced eGFR, hematuria, hypertension), and response to steroids. From a total of 169 children who underwent kidney biopsy for NS we included 65 children with MCD and 22 with FSGS for analysis. There were no significant between-group differences in age, sex, or eGFR at the time of diagnosis. The FSGS group had a higher proportion of hypertension (40 vs. 15%; p = 0.02), hematuria (80 vs. 47%; p = 0.01), and nephritis (22 vs. 2%; p = 0.004) and was more likely to be steroid resistant after 6 weeks of treatment than the MCD group (67 vs. 19%; p < 0.001). As predictors of FSGS, hematuria had a high sensitivity of 0.80 [95% confidence interval (CI) 0.56-0.93] and low specificity of 0.53 (95% CI 0.39-0.66), nephritis had a low sensitivity of 0.22 (95% CI 0.07-0.48) and high specificity of 0.98 (95% CI 0.88-0.99), and steroid resistance had a low sensitivity of 0.67 (95% CI 0.43-0.85) and high specificity of 0.81 (95% CI 0.68-0.90). The combination of steroid resistance after 6 weeks of therapy and/or nephritis at diagnosis yielded the optimal sensitivity and specificity at 0.80 (95% CI 0.56-0.93) and 0.75 (95% CI 0.60-0.86), respectively, confirmed by the highest receiver operator characteristic

  5. Liver Biopsies for Chronic Hepatitis C: Should Nonultrasound-Guided Biopsies Be Abandoned?

    Directory of Open Access Journals (Sweden)

    Jennifer A Flemming

    2009-01-01

    Full Text Available BACKGROUND/OBJECTIVE: Liver biopsy has been the gold standard for grading and staging chronic hepatitis C virus (HCV-mediated liver injury. Traditionally, this has been performed by trained practitioners using a nonimage-guided percutaneous technique at the bedside. Recent literature suggests an expanding role for radiologists in obtaining biopsies using an ultrasound (US-guided technique. The present study was undertaken study to determine if the two techniques produced liver biopsy specimens of similar quality and hypothesized that at our institution, non-US-guided percutaneous liver biopsies for HCV would be of higher quality than US-guided specimens.

  6. Comparative study between the use of image guided pleural biopsy using abram’s needle and medical thoracoscope in diagnosis of exudative pleural effusion

    Directory of Open Access Journals (Sweden)

    Essam G. Hassanein

    2017-07-01

    Conclusion: If US guidance can be used for biopsies performed with an Abrams needle, the yield of this traditional method can be increased. The use of US-guided Abram’s needle pleural biopsy is simple, safe and well tolerated.

  7. Identifying pathogens of spondylodiscitis: percutaneous endoscopy or CT-guided biopsy.

    Science.gov (United States)

    Yang, Shih-Chieh; Fu, Tsai-Sheng; Chen, Lih-Huei; Chen, Wen-Jer; Tu, Yuan-Kun

    2008-12-01

    Identifying offending pathogens is crucial for appropriate antibiotic administration for infectious spondylitis. Although computed tomography (CT)-guided biopsy for bacteriologic diagnosis is a standard procedure, it has a variable success rate. Some reports claim percutaneous endoscopic discectomy and drainage offer a sufficient amount of tissue for microbiologic examination and easy application. We therefore compared the diagnostic value of CT guidance with that of endoscope guidance in 52 patients with suspected infectious spondylitis. Twenty patients underwent percutaneous endoscopic discectomy and drainage by an orthopaedic surgeon and the other 32 patients underwent CT-guided biopsies by a radiologist. Patients were followed a minimum of 12 months after treatment. Culture results of the biopsy specimens were recorded. Causative bacteria were identified more frequently with percutaneous endoscopy than in CT-guided biopsy (18 of 20 [90%] versus 15 of 32 [47%]). We observed no biopsy-related complications or side effects in either group. The data suggest percutaneous endoscopic discectomy and drainage yield higher bacterial recovery rates than CT-guided spinal biopsy. Level III, therapeutic study. See the Guidelines for Authors for a complete description of levels of evidence.

  8. [Interest using 3D ultrasound and MRI fusion biopsy for prostate cancer detection].

    Science.gov (United States)

    Marien, A; De Castro Abreu, A; Gill, I; Villers, A; Ukimura, O

    2017-09-01

    The strategic therapy for prostate cancer depends on histo-pronostics data, which could be upgraded by obtaining targeted biopsies (TB) with MRI (magnetic resonance imagery) fusion 3D ultrasound. To compare diagnostic yield of image fusion guided prostate biopsy using image fusion of multi-parametric MRI (mpMRI) with 3D-TRUS. Between January 2010 and April 2013, 179 consecutive patients underwent outpatient TRUS biopsy using the real-time 3D TRUS tracking system (Urostation™). These patients underwent MRI-TRUS fusion targeted biopsies (TB) with 3D volume data of the MRI elastically fused with 3D TRUS at the time of biopsy. A hundred and seventy-three patients had TBs with fusion. Mean biopsy core per patient were 11.1 (6-14) for SB and 2.4 (1-6) for TB. SBs were positive in 11% compared to 56% for TB (Pperform the higher level of MR/US fusion and should be use for active surveillance. 4. Copyright © 2017 Elsevier Masson SAS. All rights reserved.

  9. The technique of ultrasound guided prostate biopsy.

    Science.gov (United States)

    Romics, Imre

    2004-11-01

    This article discusses the preparations for ultrasound guided prostate biopsy, the conditions used and the process of performing a biopsy. The first step in preparing the patient is a cleansing enema before biopsy. Every author proposes the use of a preoperative antibiotic based prophylaxis. Differences may be found in the type, dosage and the duration of this preoperative application, which can last from 2 h to 2 days. For anaesthesia, lidocaine has been proposed, which may be used as a gel applied in the rectum or in the form of a prostate infiltrate. Quite a few colleagues administer a brief intravenous narcosis. A major debate goes on in respect of defining the number of biopsy samples needed. Hodge proposed sextant biopsy in 1989, for which we had false negative findings in 20% of all cases. Because of this, it has recently been suggested that eight or rather ten samples be taken. There are some who question even this. Twelve biopsy samples do offer an advantage compared to six, although in the case of eight this is not the case. We shall present an in depth discussion of the various opinions on the different numbers of biopsies samples required. For the sample site, the apex, the base and the middle part are proposed, and (completing the process) two additional samples can also be taken from the transition zone (TZ), since 20% of all prostate cancers originate from TZ. In case of a palpable nodule or any lesion made visible by TRUS, an additional, targeted, biopsy has to be performed. Certain new techniques like the 3-D Doppler, contrast, intermittent and others shall also be presented. The control of the full length of samples taken by a gun, as well as the proper conservation of the samples, are parts of pathological processing and of the technical tasks. A repeated biopsy is necessary in the case of PIN atypia, beyond which the author also discusses other indications for a repeated biopsy. We may expect the occurrence of direct postoperative complications

  10. CT fluoroscopy guided transpleural cutting needle biopsy of small ({<=}2.5 cm) subpleural pulmonary nodules

    Energy Technology Data Exchange (ETDEWEB)

    Prosch, Helmut; Oschatz, Elisabeth; Eisenhuber, Edith; Wohlschlager, Helmut [Otto Wagner Hospital, Department of Radiology, Sanatoriumsstrasse 2, 1140 Vienna (Austria); Mostbeck, Gerhard H., E-mail: gerhard.mostbeck@wienkav.at [Otto Wagner Hospital, Department of Radiology, Sanatoriumsstrasse 2, 1140 Vienna (Austria)

    2011-01-15

    Purpose: Small subpleural pulmonary lesions are difficult to biopsy. While the direct, short needle path has been reported to have a lower rate of pneumothorax, the indirect path provides a higher diagnostic yield. Therefore, we tried to optimize the needle pathway and minimize the iatrogenic pneumothorax risk by evaluating a CT fluoroscopy guided direct approach to biopsy subpleural lesions. Material and methods: Between 01/2005 and 01/2007, CT fluoroscopy guided core biopsies were performed in 24 patients. Using our technique, the tip of the guide needle remains outside the visceral pleura (17 G coaxial guide needle, 18 G Biopsy-gun, 15 or 22 mm needle path). The position of the lesion relative to the needle tip can be optimized using CT fluoroscopy by adjusting the breathing position of the patient. The Biopty gun is fired with the needle tip still outside the pleural space. Cytological smears are analyzed by a cytopathologist on-site, and biopsies are repeated as indicated with the coaxial needle still outside the pleura. Results: Median nodule size was 1.6 cm (0.7-2.3 cm). A definitive diagnosis was obtained in 22 patients by histology and/or cytology. In one patient, only necrotic material could be obtained. In another patient, the intervention had to be aborted as the dyspnoic patient could not follow breathing instructions. An asymptomatic pneumothorax was present in seven patients; chest tube placement was not required. Conclusion: The presented biopsy approach has a high diagnostic yield and is especially advantageous for biopsies of small subpleural lesions in the lower lobes.

  11. Analysis and Experiments on Sea Load and Fastened Mechanics on Pipe Clamps

    Directory of Open Access Journals (Sweden)

    Wang Zhuo

    2017-08-01

    Full Text Available When an offshore oil field completed and put into production, new subsea pipelines and the new cable need to be established. Cable protection pipe clamp is used to fix cable protection pipe on the jacket. In order to avoid the problem of traditional steel structure clamp splice, counterpoint, fastening difficulty when installed cable protection pipe under water, reduce the risk and workload of under water, This paper develop a new type of portable connecting riser clamp -“backpack clamp” which solve the riser cable protection pipe difficult underwater installation problem. The main structure of backpack clamp used three valves type structure. The load characteristic of a clamping device was determined by the Morison equation which was a classical theory. Clamp device underwater mechanics analysis model was established. The minimum tension pre-tightening force was determined. The results show that the strength of the base meets the requirements after strength analysis with finite element analysis method, stability and strength experiments, which means the clamp based on resin matrix composite is feasible.

  12. A missing factor in chip-based patch clamp assay: gigaseal

    International Nuclear Information System (INIS)

    Ong, W-L; Yobas, L; Ong, W-Y

    2006-01-01

    The 'gold' standard in the study of ionic currents across biological membranes is the Patch Clamp method. However, this is a slow, labor and skill intensive process. High throughput patch clamp devices are mainly chip-based. A major challenge in these miniaturized devices is the low rate of 'Gigaseal' formation which is critical in the study of Single Channel effect. In a conventional patch clamp, a pipette moves and patches a fixed cell (cell-adhered patch) which is grown on the bottom of a Petri dish. In the chip-based case, the cells are in suspension and move towards the fixed patch clamp sites (cell-suspended patch). In this study, using the proven conventional patch clamp setup, we investigated the effect of the differences in the cell configurations between the convention patch clamp and cell-based patch clamp. It is shown that adhered cells (as used in the conventional setup) have a much higher rate of gigaseal formation as compared to the cells in suspension (as used in chip-based devices). We postulate that the arrangement of the cytoskeleton within the cell plays a major part in the formation of the gigaseal

  13. Dynamic assembly of Hda and the sliding clamp in the regulation of replication licensing.

    Science.gov (United States)

    Kim, Jin S; Nanfara, Michael T; Chodavarapu, Sundari; Jin, Kyeong S; Babu, Vignesh M P; Ghazy, Mohamed A; Chung, Scisung; Kaguni, Jon M; Sutton, Mark D; Cho, Yunje

    2017-04-20

    Regulatory inactivation of DnaA (RIDA) is one of the major regulatory mechanisms of prokaryotic replication licensing. In RIDA, the Hda-sliding clamp complex loaded onto DNA directly interacts with adenosine triphosphate (ATP)-bound DnaA and stimulates the hydrolysis of ATP to inactivate DnaA. A prediction is that the activity of Hda is tightly controlled to ensure that replication initiation occurs only once per cell cycle. Here, we determined the crystal structure of the Hda-β clamp complex. This complex contains two pairs of Hda dimers sandwiched between two β clamp rings to form an octamer that is stabilized by three discrete interfaces. Two separate surfaces of Hda make contact with the β clamp, which is essential for Hda function in RIDA. The third interface between Hda monomers occludes the active site arginine finger, blocking its access to DnaA. Taken together, our structural and mutational analyses of the Hda-β clamp complex indicate that the interaction of the β clamp with Hda controls the ability of Hda to interact with DnaA. In the octameric Hda-β clamp complex, the inability of Hda to interact with DnaA is a novel mechanism that may regulate Hda function. © The Author(s) 2017. Published by Oxford University Press on behalf of Nucleic Acids Research.

  14. Generalization of the dynamic clamp concept in neurophysiology and behavior.

    Directory of Open Access Journals (Sweden)

    Pablo Chamorro

    Full Text Available The idea of closed-loop interaction in in vitro and in vivo electrophysiology has been successfully implemented in the dynamic clamp concept strongly impacting the research of membrane and synaptic properties of neurons. In this paper we show that this concept can be easily generalized to build other kinds of closed-loop protocols beyond (or in addition to electrical stimulation and recording in neurophysiology and behavioral studies for neuroethology. In particular, we illustrate three different examples of goal-driven real-time closed-loop interactions with drug microinjectors, mechanical devices and video event driven stimulation. Modern activity-dependent stimulation protocols can be used to reveal dynamics (otherwise hidden under traditional stimulation techniques, achieve control of natural and pathological states, induce learning, bridge between disparate levels of analysis and for a further automation of experiments. We argue that closed-loop interaction calls for novel real time analysis, prediction and control tools and a new perspective for designing stimulus-response experiments, which can have a large impact in neuroscience research.

  15. Impedance spectra of patch clamp scenarios for single cells immobilized on a lab-on-a-chip

    DEFF Research Database (Denmark)

    Alberti, Massimo; Snakenborg, Detlef; Lopacinska, Joanna M.

    2014-01-01

    A simple method based on impedance spectroscopy (IS) was developed to distinguish between different patch clamp modes for single cells trapped on microapertures in a patch clamp microchannel array designed for patch clamping on cultured cells. The method allows detecting via impedance analysis wh...

  16. Serial superficial digital flexor tendon biopsies for diagnosing and monitoring collagenase-induced tendonitis in horses

    Directory of Open Access Journals (Sweden)

    José C. de Lacerda Neto

    2013-06-01

    Full Text Available The purpose of this investigation was to demonstrate the feasibility of a biopsy technique by performing serial evaluations of tissue samples of the forelimb superficial digital flexor tendon (SDFT in healthy horses and in horses subjected to superficial digital flexor tendonitis induction. Eight adult horses were evaluated in two different phases (P, control (P1 and tendonitis-induced (P2. At P1, the horses were subjected to five SDFT biopsies of the left forelimb, with 24 hours (h of interval. Clinical and ultrasonographic (US examinations were performed immediately before the tendonitis induction, 24 and 48 h after the procedure. The biopsied tendon tissues were analyzed through histology. P2 evaluations were carried out three months later, when the same horses were subjected to tendonitis induction by injection of bacterial collagenase into the right forelimb SDFT. P2 clinical and US evaluations, and SDFT biopsies were performed before, and after injury induction at the following time intervals: after 24, 48, 72 and 96 h, and after 15, 30, 60, 90, 120 and 150 days. The biopsy technique has proven to be easy and quick to perform and yielded good tendon samples for histological evaluation. At P1 the horses did not show signs of localised inflammation, pain or lameness, neither SDFT US alterations after biopsies, showing that the biopsy procedure per se did not risk tendon integrity. Therefore, this procedure is feasible for routine tendon histological evaluations. The P2 findings demonstrate a relation between the US and histology evaluations concerning induced tendonitis evolution. However, the clinical signs of tendonitis poorly reflected the microscopic tissue condition, indicating that clinical presentation is not a reliable parameter for monitoring injury development. The presented method of biopsying SDFT tissue in horses enables the serial collection of material for histological analysis causing no clinical signs and tendon damage seen

  17. Ultrasound-guided diagnostic breast biopsy methodology: retrospective comparison of the 8-gauge vacuum-assisted biopsy approach versus the spring-loaded 14-gauge core biopsy approach

    Science.gov (United States)

    2011-01-01

    Background Ultrasound-guided diagnostic breast biopsy technology represents the current standard of care for the evaluation of indeterminate and suspicious lesions seen on diagnostic breast ultrasound. Yet, there remains much debate as to which particular method of ultrasound-guided diagnostic breast biopsy provides the most accurate and optimal diagnostic information. The aim of the current study was to compare and contrast the 8-gauge vacuum-assisted biopsy approach and the spring-loaded 14-gauge core biopsy approach. Methods A retrospective analysis was done of all ultrasound-guided diagnostic breast biopsy procedures performed by either the 8-gauge vacuum-assisted biopsy approach or the spring-loaded 14-gauge core biopsy approach by a single surgeon from July 2001 through June 2009. Results Among 1443 ultrasound-guided diagnostic breast biopsy procedures performed, 724 (50.2%) were by the 8-gauge vacuum-assisted biopsy technique and 719 (49.8%) were by the spring-loaded 14-gauge core biopsy technique. The total number of false negative cases (i.e., benign findings instead of invasive breast carcinoma) was significantly greater (P = 0.008) in the spring-loaded 14-gauge core biopsy group (8/681, 1.2%) as compared to in the 8-gauge vacuum-assisted biopsy group (0/652, 0%), with an overall false negative rate of 2.1% (8/386) for the spring-loaded 14-gauge core biopsy group as compared to 0% (0/148) for the 8-gauge vacuum-assisted biopsy group. Significantly more (P guided diagnostic breast biopsy procedure. Significantly more (P guided diagnostic breast biopsy procedure. Conclusions In appropriately selected cases, the 8-gauge vacuum-assisted biopsy approach appears to be advantageous to the spring-loaded 14-gauge core biopsy approach for providing the most accurate and optimal diagnostic information. PMID:21835024

  18. Analysis of the role of PCNA-DNA contacts during clamp loading

    Directory of Open Access Journals (Sweden)

    Goedken Eric R

    2010-01-01

    Full Text Available Abstract Background Sliding clamps, such as Proliferating Cell Nuclear Antigen (PCNA in eukaryotes, are ring-shaped protein complexes that encircle DNA and enable highly processive DNA replication by serving as docking sites for DNA polymerases. In an ATP-dependent reaction, clamp loader complexes, such as the Replication Factor-C (RFC complex in eukaryotes, open the clamp and load it around primer-template DNA. Results We built a model of RFC bound to PCNA and DNA based on existing crystal structures of clamp loaders. This model suggests that DNA would enter the clamp at an angle during clamp loading, thereby interacting with positively charged residues in the center of PCNA. We show that simultaneous mutation of Lys 20, Lys 77, Arg 80, and Arg 149, which interact with DNA in the RFC-PCNA-DNA model, compromises the ability of yeast PCNA to stimulate the DNA-dependent ATPase activity of RFC when the DNA is long enough to extend through the clamp. Fluorescence anisotropy binding experiments show that the inability of the mutant clamp proteins to stimulate RFC ATPase activity is likely caused by reduction in the affinity of the RFC-PCNA complex for DNA. We obtained several crystal forms of yeast PCNA-DNA complexes, measuring X-ray diffraction data to 3.0 Å resolution for one such complex. The resulting electron density maps show that DNA is bound in a tilted orientation relative to PCNA, but makes different contacts than those implicated in clamp loading. Because of apparent partial disorder in the DNA, we restricted refinement of the DNA to a rigid body model. This result contrasts with previous analysis of a bacterial clamp bound to DNA, where the DNA was well resolved. Conclusion Mutational analysis of PCNA suggests that positively charged residues in the center of the clamp create a binding surface that makes contact with DNA. Disruption of this positive surface, which had not previously been implicated in clamp loading function, reduces RFC

  19. A Central Swivel Point in the RFC Clamp Loader Controls PCNA Opening and Loading on DNA

    OpenAIRE

    Sakato, Miho; O’Donnell, Mike; Hingorani, Manju M.

    2011-01-01

    Replication Factor C (RFC) is a 5-subunit complex that loads PCNA clamps onto primer-template DNA (ptDNA) during replication. RFC subunits belong to the AAA+ superfamily, and their ATPase activity drives interactions between the clamp loader, clamp, and ptDNA, leading to topologically linked PCNA•ptDNA. We report the kinetics of transient events in S. cerevisiae RFC catalyzed PCNA loading, including ATP-induced RFC activation, PCNA opening, ptDNA binding, ATP hydrolysis, PCNA closing and PCNA...

  20. Effective lactation yield

    NARCIS (Netherlands)

    Kok, Akke; Middelaar, van C.E.; Engel, B.; Knegsel, van A.T.M.; Hogeveen, H.; Kemp, B.; Boer, de I.J.M.

    2016-01-01

    To compare milk yields between cows or management strategies, lactations are traditionally standardized to 305-d yields. The 305-d yield, however, gives no insight into the combined effect of additional milk yield before calving, decreased milk yield after calving, and a possible shorter calving

  1. Modeling the euglycemic hyperinsulinemic clamp by stochastic differential equations.

    Science.gov (United States)

    Picchini, Umberto; Ditlevsen, Susanne; De Gaetano, Andrea

    2006-11-01

    The Euglycemic Hyperinsulinemic Clamp (EHC) is the most widely used experimental procedure for the determination of insulin sensitivity. In the present study, 16 subjects with BMI between 18.5 and 63.6 kg/m(2) have been studied with a long-duration (5 hours) EHC. In order to explain the oscillations of glycemia occurring in response to the hyperinsulinization and to the continuous glucose infusion at varying speeds, we first hypothesized a system of ordinary differential equations (ODEs), with limited success. We then extended the model and represented the experiment using a system of stochastic differential equations (SDEs). The latter allow for distinction between (i) random variation imputable to observation error and (ii) system noise (intrinsic variability of the metabolic system), due to a variety of influences which change over time. The stochastic model of the EHC was fitted to data and the system noise was estimated by means of a (simulated) maximum likelihood procedure, for a series of different hypothetical measurement error values. We showed that, for the whole range of reasonable measurement error values: (i) the system noise estimates are non-negligible; and (ii) these estimates are robust to changes in the likely value of the measurement error. Explicit expression of system noise is physiologically relevant in this case, since glucose uptake rate is known to be affected by a host of additive influences, usually neglected when modeling metabolism. While in some of the studied subjects system noise appeared to only marginally affect the dynamics, in others the system appeared to be driven more by the erratic oscillations in tissue glucose transport rather than by the overall glucose-insulin control system. It is possible that the quantitative relevance of the unexpressed effects (system noise) should be considered in other physiological situations, represented so far only with deterministic models.

  2. Renal Biopsy in Type 2 Diabetic Patients.

    Science.gov (United States)

    Espinel, Eugenia; Agraz, Irene; Ibernon, Meritxell; Ramos, Natalia; Fort, Joan; Serón, Daniel

    2015-05-18

    The majority of diabetic patients with renal involvement are not biopsied. Studies evaluating histological findings in renal biopsies performed in diabetic patients have shown that approximately one third of the cases will show pure diabetic nephropathy, one third a non-diabetic condition and another third will show diabetic nephropathy with a superimposed disease. Early diagnosis of treatable non-diabetic diseases in diabetic patients is important to ameliorate renal prognosis. The publication of the International Consensus Document for the classification of type 1 and type 2 diabetes has provided common criteria for the classification of diabetic nephropathy and its utility to stratify risk for renal failure has already been demonstrated in different retrospective studies. The availability of new drugs with the potential to modify the natural history of diabetic nephropathy has raised the question whether renal biopsies may allow a better design of clinical trials aimed to delay the progression of chronic kidney disease in diabetic patients.

  3. Comparative study of decomposable and indecomposable biopsy needle in lung puncture biopsy

    International Nuclear Information System (INIS)

    Wang Bo; Sheng Zhanxin; Wen Yamin; Zhang Liping; Wen Zongqiu

    2007-01-01

    Objective: To contrast the clinical practice characteristics with decomposable and indecomposable biopsy needle in the CT-guided lung puncture biopsy. Methods: 50 patients with lung tumour carried on puncture biopsy under the CT guidance were divided in two groups randomly: Group A (25 examples): using the indecomposable BioPinceTM biopsy needle; Group B(25 examples): using the decomposable Precisa or Vitesse biopsy needle. The puncture biopsy organization quantity, the first time puncture success rate, the pathological diagnosis result and the incidence of puncture complication were compared in two groups. Results: More striped structures were gained obviously in group A than in group B: 24/25 and 11/25 respectively (P>0.05), The pathological diagnosis 'serious extrusion amoebocyte and nature undetermined' only occurred in group B. But the first time puncture success rate was lower in group A than in B: 52%(13/25) and 80%(20/25) respectively (P>0.05), The incidence of hemorrhage and pneumothorax in group A was higher slightly: 84% and 72%, 16% and 4% respectively (P>0.05). Conclusion: The indecomposable needle (BioPinceTM) was better in lung puncture biopsy, but the lower first time puncture success rate also increases the risk of operation and complication in some degree because of the structure of the needle. On the contrary, decomposable needle (the Precisa or the Vitesse) was not the best choice in lung puncture biopsy. But it had the original superiority, especially regarding the special patient such as patient with small tumour, thin thoracic wall, bad physique for its nimble operation. It is essential for us to use the two different types of biopsy needle rationally to enhance the level of CT-guided lung puncture biopsy. (authors)

  4. Influence of non-steady state during isoglycemic hyperinsulinemic clamp in hypertension. A LIFE substudy

    DEFF Research Database (Denmark)

    Olsen, M H; Andersen, U B; Wachtell, K

    1999-01-01

    hyperinsulinemic clamp in 26 young, healthy subjects and 43 elderly patients with unmedicated essential hypertension and left ventricular hypertrophy. The 3-h Sip correlated strongly with the 2-h M/IG in the patients (r = 0.88, p

  5. Implementation of a fast 16-Bit dynamic clamp using LabVIEW-RT.

    Science.gov (United States)

    Kullmann, Paul H M; Wheeler, Diek W; Beacom, Joshua; Horn, John P

    2004-01-01

    The dynamic-clamp method provides a powerful electrophysiological tool for creating virtual ionic conductances in living cells and studying their influence on membrane potential. Here we describe G-clamp, a new way to implement a dynamic clamp using the real-time version of the Lab-VIEW programming environment together with a Windows host, an embedded microprocessor that runs a real-time operating system and a multifunction data-acquisition board. The software includes descriptions of a fast voltage-dependent sodium conductance, delayed rectifier, M-type and A-type potassium conductances, and a leak conductance. The system can also read synaptic conductance waveforms from preassembled data files. These virtual conductances can be reliably implemented at speeds LabVIEW should make it relatively easy for others to adapt G-clamp for new experimental applications.

  6. Design and testing of CRBRP insulated horizontal and vertical pipe clamps

    International Nuclear Information System (INIS)

    Pollono, L.P.; Mello, R.M.

    1980-01-01

    The Clinch River Breeder Reactor Plant (CRBRP) Primary Heat Transport system piping may be characterized as large-diameter, thin-wall piping which transports liquid sodium at high temperatures. The piping is arranged in accord with the elevated loop concept, consisting of large horizontal inplane, expansion loops and long, vertical runs of piping. These characteristics and the postulated thermal transient and seismic loads, which are imposed on the piping, dictate pipe clamp designs that are substantially different from standard off the shelf pipe clamp designs. The design features of the CRBRP horizontal and vertical pipe clamps for the large sodium piping, the various test programs used to verify the clamp designs, and the results of this testing are presented

  7. Welding scheme optimization for the U-shaped flexible clamps of ITER poloidal field coil supports

    International Nuclear Information System (INIS)

    Zhang Teng; Li Pengyuan; Sun Zhenchao; Xu Dan; Han Shilei; Wang Yue

    2015-01-01

    The numerical simulation and welding experiment were adopted to investigate the welding deformation of ITER poloidal field coil supports, and the comparison of the simulation and the actual measurement was made to verify the validity of simulation. The basic law of welding seam deformation on the U-shaped flexible clamps was obtained and the existing clamps type was improved. Furthermore, based on the verified heat and mechanical boundary condition and the optimization clamp, the calculations of welding deformations of U-shaped flexible clamps in three different welding plans were carried out and an optimized plan for the poloidal field coil supports fabricating was proposed. The optimal welding deformation is controlled within 0.6 mm. (authors)

  8. Suppression of Spiral Waves by Voltage Clamp Techniques in a Conductance-Based Cardiac Tissue Model

    International Nuclear Information System (INIS)

    Lian-Chun, Yu; Guo-Yong, Zhang; Yong, Chen; Jun, Ma

    2008-01-01

    A new control method is proposed to control the spatio-temporal dynamics in excitable media, which is described by the Morris–Lecar cells model. It is confirmed that successful suppression of spiral waves can be obtained by spatially clamping the membrane voltage of the excitable cells. The low voltage clamping induces breakup of spiral waves and the fragments are soon absorbed by low voltage obstacles, whereas the high voltage clamping generates travel waves that annihilate spiral waves through collision with them. However, each method has its shortcomings. Furthermore, a two-step method that combines both low and high voltage clamp techniques is then presented as a possible way of out this predicament. (cross-disciplinary physics and related areas of science and technology)

  9. Model Clamp: A Computer Tool to Probe Action Potential Transfer Between Cardiac Cells

    National Research Council Canada - National Science Library

    Wilders, Ronald

    2001-01-01

    In the early nineties, Joyner and coworkers introduced the "coupling clamp" technique in which an isolated cardiac cell can be electrically coupled to either another isolated cardiac cell or to an analog model cell (RC circuit...

  10. Estimation on the clamping force of high strength bolt by temperature parameter

    International Nuclear Information System (INIS)

    Nah, Hwan-Seon; Kim, Kang-Seok; Lee, Hyeon-Ju; Kim, Woo-Bum

    2009-01-01

    In case of Korean nuclear power plant, the field design of bolted connection for steel structures has been changed from high strength hexagon bolt to torque shear bolt. The torque control method is mainly used as a clamping method of high strength bolt at construction site. However the torque coefficient affects the design strength in tension on the process of tightening by torque control. This is why it is obscure to assume quantitatively the direct tension induced into bolt. The determinant factor affected on the clamping force is ambient temperature as Korean standard B 2819 indicated. This study was planned to assess the expected clamping force on two kinds of high strength bolts considering temperature ranged from -10degC to 50degC. From test data subjected to temperature parameters, the equation to estimate the clamping force was extracted by regression analysis. (author)

  11. Ultrasound-guided fine needle aspiration versus core needle biopsy: comparison of post-biopsy hematoma rates and risk factors.

    Science.gov (United States)

    Chae, In Hye; Kim, Eun-Kyung; Moon, Hee Jung; Yoon, Jung Hyun; Park, Vivian Y; Kwak, Jin Young

    2017-07-01

    To compare post-biopsy hematoma rates between ultrasound guided-fine needle aspiration and ultrasound guided-core needle biopsy, and to investigate risk factors for post-biopsy hematoma. A total of 5304 thyroid nodules which underwent ultrasound guided biopsy were included in this retrospective study. We compared clinical and US features between patients with and without post-biopsy hematoma. Associations between these features and post-biopsy hematoma were analyzed. Post-biopsy hematoma rate was 0.8% (43/5121) for ultrasound guided-fine needle aspiration and 4.9% (9/183) for ultrasound guided-core needle biopsy (P guided-fine needle aspiration, gender, age, size, presence of vascularity, and suspicious US features were not associated with post-biopsy hematoma according to experience level. Post-biopsy hematoma occurred significantly more with ultrasound guided-core needle biopsy (9/179, 5.0%) than with ultrasound guided-fine needle aspiration (9/1138, 0.8%) (P guided-core needle biopsy was the only significant risk factor for post-biopsy hematoma (adjusted Odds Ratio, 6.458, P guided-core needle biopsy than in ultrasound guided-fine needle aspiration and ultrasound guided-core needle biopsy was the only independent factor of post-biopsy hematoma in thyroid nodules.

  12. Delayed umbilical cord clamping after childbirth: potential benefits to baby's health

    Directory of Open Access Journals (Sweden)

    Uwins C

    2014-11-01

    Full Text Available Christina Uwins,1 David JR Hutchon2 1Department of Obstetrics and Gynaecology, Croydon University Hospital, Croydon, 2Department of Obstetrics, Darlington Memorial Hospital, Darlington, UKAbstract: Early cord clamping was initially introduced as part of the package of care known as “active management of the third stage”, which was implemented to reduce postpartum hemorrhage. It has now been shown to provide no benefit to the mother and to result in harm to the neonate. The clinical trial evidence relating to delayed cord clamping compared to immediate cord clamping is presented and the physiological rationale for delayed cord clamping is discussed in this paper. Most organizations (eg World Health Organization (WHO, Royal College of Obstetricians and Gynaecologists (RCOG, Resuscitation Council (UK,The International Federation of Gynecology and Obstetrics (FIGO, International Confederation of Midwives, International Liaison Committee on Resuscitation (ILCOR and the European Resuscitation Council now advise a delay of 1–3 minutes before clamping the cord in term and preterm infants, and clinicians need to be aware of this change. Healthy neonates benefit from a more physiological and gentle transition from placental to pulmonary respiration, and we explain why this benefit should be provided to all neonates until there is any evidence to the contrary. The harm of early cord clamping is not limited to anemia and iron deficiency, and evidence for a wide range of possible harms of early cord clamping is presented. The need for resuscitation is one of the most common concerns, and ways of overcoming these concerns are described.Keywords: transition, cord clamping, hypovolemia, intraventricular hemorrhage

  13. Patch Clamp: A Powerful Technique for Studying the Mechanism of Acupuncture

    Directory of Open Access Journals (Sweden)

    D. Zhang

    2012-01-01

    Full Text Available Cellular and molecular events can be investigated using electrophysiological techniques. In particular, the patch-clamp method provides detailed information. In addition, the patch-clamp technique has become a powerful method for investigating the mechanisms underlying the effects of acupuncture. In this paper, recent researches on how acupuncture might modulate electrophysiological responses in the central nervous system (CNS and affect peripheral structures are reviewed.

  14. Computer Simulation Model to Train Medical Personnel on Glucose Clamp Procedures.

    Science.gov (United States)

    Maghoul, Pooya; Boulet, Benoit; Tardif, Annie; Haidar, Ahmad

    2017-10-01

    A glucose clamp procedure is the most reliable way to quantify insulin pharmacokinetics and pharmacodynamics, but skilled and trained research personnel are required to frequently adjust the glucose infusion rate. A computer environment that simulates glucose clamp experiments can be used for efficient personnel training and development and testing of algorithms for automated glucose clamps. We built 17 virtual healthy subjects (mean age, 25±6 years; mean body mass index, 22.2±3 kg/m 2 ), each comprising a mathematical model of glucose regulation and a unique set of parameters. Each virtual subject simulates plasma glucose and insulin concentrations in response to intravenous insulin and glucose infusions. Each virtual subject provides a unique response, and its parameters were estimated from combined intravenous glucose tolerance test-hyperinsulinemic-euglycemic clamp data using the Bayesian approach. The virtual subjects were validated by comparing their simulated predictions against data from 12 healthy individuals who underwent a hyperglycemic glucose clamp procedure. Plasma glucose and insulin concentrations were predicted by the virtual subjects in response to glucose infusions determined by a trained research staff performing a simulated hyperglycemic clamp experiment. The total amount of glucose infusion was indifferent between the simulated and the real subjects (85±18 g vs. 83±23 g; p=NS) as well as plasma insulin levels (63±20 mU/L vs. 58±16 mU/L; p=NS). The virtual subjects can reliably predict glucose needs and plasma insulin profiles during hyperglycemic glucose clamp conditions. These virtual subjects can be used to train personnel to make glucose infusion adjustments during clamp experiments. Copyright © 2017 Diabetes Canada. Published by Elsevier Inc. All rights reserved.

  15. Dual Roles of Ctf18-RFC: Loading the Clamp and Angling for the Polymerase.

    Science.gov (United States)

    Pellegrini, Luca

    2018-01-02

    Clamp loaders such as Ctf18-RFC assist DNA replication by loading the PCNA clamp onto DNA. In this issue of Structure, Grabarczyk et al. (2018) reveal that a hook-like structure formed by the unique Dcc1 and Ctf8 subunits mediates the interaction of Ctf18-RFC with the leading strand DNA polymerase ɛ. Copyright © 2017 Elsevier Ltd. All rights reserved.

  16. The TCF C-clamp DNA binding domain expands the Wnt transcriptome via alternative target recognition.

    Science.gov (United States)

    Hoverter, Nate P; Zeller, Michael D; McQuade, Miriam M; Garibaldi, Angela; Busch, Anke; Selwan, Elizabeth M; Hertel, Klemens J; Baldi, Pierre; Waterman, Marian L

    2014-12-16

    LEF/TCFs direct the final step in Wnt/β-catenin signalling by recruiting β-catenin to genes for activation of transcription. Ancient, non-vertebrate TCFs contain two DNA binding domains, a High Mobility Group box for recognition of the Wnt Response Element (WRE; 5'-CTTTGWWS-3') and the C-clamp domain for recognition of the GC-rich Helper motif (5'-RCCGCC-3'). Two vertebrate TCFs (TCF-1/TCF7 and TCF-4/TCF7L2) use the C-clamp as an alternatively spliced domain to regulate cell-cycle progression, but how the C-clamp influences TCF binding and activity genome-wide is not known. Here, we used a doxycycline inducible system with ChIP-seq to assess how the C-clamp influences human TCF1 binding genome-wide. Metabolic pulse-labeling of nascent RNA with 4'Thiouridine was used with RNA-seq to connect binding to the Wnt transcriptome. We find that the C-clamp enables targeting to a greater number of gene loci for stronger occupancy and transcription regulation. The C-clamp uses Helper sites concurrently with WREs for gene targeting, but it also targets TCF1 to sites that do not have readily identifiable canonical WREs. The coupled ChIP-seq/4'Thiouridine-seq analysis identified new Wnt target genes, including additional regulators of cell proliferation. Thus, C-clamp containing isoforms of TCFs are potent transcriptional regulators with an expanded transcriptome directed by C-clamp-Helper site interactions. © The Author(s) 2014. Published by Oxford University Press on behalf of Nucleic Acids Research.

  17. An ANN Based Capicitor Voltage Balancing Method For Neutral Point Clamped Multi-Level Inverter

    OpenAIRE

    P.J.S. Praveen,; Narendra Bavisetti

    2015-01-01

    Multi-level inverters are became popular for usage in medium voltage, low voltage power applications due to flexibility in control and better performance characteristics in terms of harmonic regulation. Neutral point clamped are popular as they require less number of sources as their input when compared with their counter parts i.e. cascaded multi-level inverters and found to be reliable when compared with flying capacitor based multi-level inverters. But when neutral clamped tech...

  18. Optical Biopsy of Peripheral Nerve Using Confocal Laser Endomicroscopy: A New Tool for Nerve Surgeons?

    Directory of Open Access Journals (Sweden)

    Christopher S Crowe

    2015-09-01

    Full Text Available Peripheral nerve injuries remain a challenge for reconstructive surgeons with many patients obtaining suboptimal results. Understanding the level of injury is imperative for successful repair. Current methods for distinguishing healthy from damaged nerve are time consuming and possess limited efficacy. Confocal laser endomicroscopy (CLE is an emerging optical biopsy technology that enables dynamic, high resolution, sub-surface imaging of live tissue. Porcine sciatic nerve was either left undamaged or briefly clamped to simulate injury. Diluted fluorescein was applied topically to the nerve. CLE imaging was performed by direct contact of the probe with nerve tissue. Images representative of both damaged and undamaged nerve fibers were collected and compared to routine H&E histology. Optical biopsy of undamaged nerve revealed bands of longitudinal nerve fibers, distinct from surrounding adipose and connective tissue. When damaged, these bands appear truncated and terminate in blebs of opacity. H&E staining revealed similar features in damaged nerve fibers. These results prompt development of a protocol for imaging peripheral nerves intraoperatively. To this end, improving surgeons' ability to understand the level of injury through real-time imaging will allow for faster and more informed operative decisions than the current standard permits.

  19. Computed tomography-guided percutaneous biopsy of pancreatic masses using pneumodissection; Biopsia percutanea de massas pancreaticas guiada por tomografia computadorizada com pneumodisseccao

    Energy Technology Data Exchange (ETDEWEB)

    Tyng, Chiang Jeng; Bitencourt, Almir Galvao Vieira; Almeida, Maria Fernanda Arruda; Barbosa, Paula Nicole Vieira; Martins, Eduardo Bruno Lobato; Junior, Joao Paulo Kawaoka Matushita; Chojniak, Rubens, E-mail: chiangjengtyng@gmail.com [Hospital A.C. Camargo, Sao Paulo, SP (Brazil). Dept. de Imagem; Coimbra, Felipe Jose Fernandez [Hospital A.C. Camargo, Sao Paulo, SP (Brazil). Dept. de Cirurgia Abdominal

    2013-05-15

    Objective: to describe the technique of computed tomography-guided percutaneous biopsy of pancreatic tumors with pneumodissection. Materials and methods: in the period from June 2011 to May 2012, seven computed tomography guided percutaneous biopsies of pancreatic tumors utilizing pneumodissection were performed in the authors' institution. All the procedures were performed with an automatic biopsy gun and coaxial system with Tru-core needles. The biopsy specimens were histologically assessed. Results: in all the cases the pancreatic mass could not be directly approached by computed tomography without passing through major organs and structures. The injection of air allowed the displacement of adjacent structures and creation of a safe coaxial needle pathway toward the lesion. Biopsy was successfully performed in all the cases, yielding appropriate specimens for pathological analysis. Conclusion: Pneumodissection is a safe, inexpensive and technically easy approach to perform percutaneous biopsy in selected cases where direct access to the pancreatic tumor is not feasible. (author)

  20. Locoregional Anesthesia for Carotid Endarterectomy: Identification of Patients with Intolerance to Cross-Clamping.

    Science.gov (United States)

    Dellaretti, Marcos; de Vasconcelos, Laura T; Dourado, Jules; de Souza, Renata F; Fontoura, Renato R; de Sousa, Atos A

    2016-03-01

    During carotid endarterectomy (CEA), carotid cross-clamping is performed to allow for artery incision and plaque removal. A small subgroup of patients can tolerate carotid occlusion for only a few seconds, if at all, without presenting neurologic deficit. These patients are described as having ''cross-clamp intolerance.'' The purpose of this study was to demonstrate the safety of locoregional anesthesia in identifying patients with cross-clamp intolerance and factors associated with this condition. From August 2008 to May 2010, 115 consecutive patients were submitted to CEA under locoregional anesthesia at the Santa Casa de Belo Horizonte; the procedure was performed by the main author. Patients who showed intolerance to internal carotid artery (ICA) occlusion for intolerance. Among the 115 participating patients, 9.6% (11 patients) showed intolerance to ICA occlusion and developed deficits in intolerance). The factor that was associated with cross-clamp intolerance was the mean degree of contralateral carotid stenosis, which was 57.5% for those who presented intolerance and 27.8% for those who tolerated ICA occlusion. Locoregional anesthesia is a safe method for identifying patients with cross-clamp intolerance. Patients with cross-clamp intolerance present contralateral stenosis that is greater on average than patients who readily tolerate carotid artery occlusion. Copyright © 2016 Elsevier Inc. All rights reserved.

  1. The effect of clamping a tensioned wire: implications for the Ilizarov external fixation system.

    Science.gov (United States)

    Watson, M A; Mathias, K J; Maffulli, N; Hukins, D W L

    2003-01-01

    This study demonstrates that clamping a tensioned wire can cause a reduction in wire tension. Tension (about 1275 N) was applied to a wire that was subsequently clamped, using cannulated bolts, to the steel half-ring of an Ilizarov external fixator. The tension in the wire was monitored before, during and after clamping. The apparatus was disassembled and the deformations in the wire caused by the clamps were measured. This experiment was repeated 15 times. When the wire was clamped to the frame, the wire tension was reduced by 22 +/- 7 per cent (mean +/- standard deviation, SD). The drop in wire tension was linearly correlated (r = 0.96; p toothpaste from a tube) and so reduce its tension during fixator assembly. To assess the magnitude of this effect in the clinical situation, the FE model analysis was repeated to replicate clamping a 1.8-mm-diameter wire to a 180-mm-diameter steel Ilizarov ring component. The analysis showed that for these conditions the tension reduced by 8-29 per cent. The results of this study highlight a general engineering problem: how can a tensioned wire be secured to a structure without an appreciable loss of tension? If the performance of the structure depends on the wire tension, this performance will change when the wire is secured.

  2. Patch-clamp technique to characterize ion channels in enlarged individual endolysosomes.

    Science.gov (United States)

    Chen, Cheng-Chang; Cang, Chunlei; Fenske, Stefanie; Butz, Elisabeth; Chao, Yu-Kai; Biel, Martin; Ren, Dejian; Wahl-Schott, Christian; Grimm, Christian

    2017-08-01

    According to proteomics analyses, more than 70 different ion channels and transporters are harbored in membranes of intracellular compartments such as endosomes and lysosomes. Malfunctioning of these channels has been implicated in human diseases such as lysosomal storage disorders, neurodegenerative diseases and metabolic pathologies, as well as in the progression of certain infectious diseases. As a consequence, these channels have engendered very high interest as future drug targets. Detailed electrophysiological characterization of intracellular ion channels is lacking, mainly because standard methods to analyze plasma membrane ion channels, such as the patch-clamp technique, are not readily applicable to intracellular organelles. Here we present a protocol detailing how to implement a manual patch-clamp technique for endolysosomal compartments. In contrast to the alternatively used planar endolysosomal patch-clamp technique, this method is a visually controlled, direct patch-clamp technique similar to conventional patch-clamping. The protocol assumes basic knowledge and experience with patch-clamp methods. Implementation of the method requires up to 1 week, and material preparation takes ∼2-4 d. An individual experiment (i.e., measurement of channel currents across the endolysosomal membrane), including control experiments, can be completed within 1 h. This excludes the time for endolysosome enlargement, which takes between 1 and 48 h, depending on the approach and cell type used. Data analysis requires an additional hour.

  3. Early identification of hERG liability in drug discovery programs by automated patch clamp.

    Science.gov (United States)

    Danker, Timm; Möller, Clemens

    2014-01-01

    Blockade of the cardiac ion channel coded by human ether-à-gogo-related gene (hERG) can lead to cardiac arrhythmia, which has become a major concern in drug discovery and development. Automated electrophysiological patch clamp allows assessment of hERG channel effects early in drug development to aid medicinal chemistry programs and has become routine in pharmaceutical companies. However, a number of potential sources of errors in setting up hERG channel assays by automated patch clamp can lead to misinterpretation of data or false effects being reported. This article describes protocols for automated electrophysiology screening of compound effects on the hERG channel current. Protocol details and the translation of criteria known from manual patch clamp experiments to automated patch clamp experiments to achieve good quality data are emphasized. Typical pitfalls and artifacts that may lead to misinterpretation of data are discussed. While this article focuses on hERG channel recordings using the QPatch (Sophion A/S, Copenhagen, Denmark) technology, many of the assay and protocol details given in this article can be transferred for setting up different ion channel assays by automated patch clamp and are similar on other planar patch clamp platforms.

  4. A High Step-Down Interleaved Buck Converter with Active-Clamp Circuits for Wind Turbines

    Directory of Open Access Journals (Sweden)

    Chih-Lung Shen

    2012-12-01

    Full Text Available In this paper, a high step-down interleaved buck coupled-inductor converter (IBCC with active-clamp circuits for wind energy conversion has been studied. In high step-down voltage applications, an IBCC can extend duty ratio and reduce voltage stresses on active switches. In order to reduce switching losses of active switches to improve conversion efficiency, a IBCC with soft-switching techniques is usually required. Compared with passive-clamp circuits, the IBCC with active-clamp circuits have lower switching losses and minimum ringing voltage of the active switches. Thus, the proposed IBCC with active-clamp circuits for wind energy conversion can significantly increase conversion efficiency. Finally, a 240 W prototype of the proposed IBCC with active-clamp circuits was built and implemented. Experimental results have shown that efficiency can reach as high as 91%. The proposed IBCC with active-clamp circuits is presented in high step-down voltage applications to verify the performance and the feasibility for energy conversion of wind turbines.

  5. Surgical Excision of Benign Papillomas Diagnosed with Core Biopsy: A Community Hospital Approach

    International Nuclear Information System (INIS)

    Rozentsvayg, Eka; Carver, Kristen; Borkar, Sunita; Mathew, Melvy; Enis, Sean; Friedman, Paul

    2011-01-01

    Our goal was to assess the value of surgical excision of benign papillomas of the breast diagnosed on percutaneous core biopsy by determining the frequency of upgrade to malignancies and high risk lesions on a final surgical pathology. We reviewed 67 patients who had biopsies yielding benign papilloma and underwent subsequent surgical excision. Surgical pathology of the excised lesions was compared with initial core biopsy pathology results. 54 patients had concordant benign core and excisional pathology. Cancer (ductal carcinoma in situ and invasive ductal carcinoma) was diagnosed in five (7%) patients. Surgery revealed high-risk lesions in 8 (12%) patients, including atypical ductal hyperplasia, atypical lobular hyperplasia, and lobular carcinoma in situ. Cancer and high risk lesions accounted for 13 (19%) upstaging events from benign papilloma diagnosis. Our data suggests that surgical excision is warranted with core pathology of benign papilloma

  6. Optimization of initial prostate biopsy in clinical practice: sampling, labeling and specimen processing.

    Science.gov (United States)

    Bjurlin, Marc A; Carter, H Ballentine; Schellhammer, Paul; Cookson, Michael S; Gomella, Leonard G; Troyer, Dean; Wheeler, Thomas M; Schlossberg, Steven; Penson, David F; Taneja, Samir S

    2013-06-01

    An optimal prostate biopsy in clinical practice is based on a balance among adequate detection of clinically significant prostate cancers (sensitivity), assuredness regarding the accuracy of negative sampling (negative predictive value), limited detection of clinically insignificant cancers and good concordance with whole gland surgical pathology results to allow accurate risk stratification and disease localization for treatment selection. Inherent within this optimization is variation of the core number, location, labeling and processing for pathological evaluation. To date, there is no consensus in this regard. The purpose of this review is to 1) define the optimal number and location of biopsy cores during primary prostate biopsy among men with suspected prostate cancer, 2) define the optimal method of labeling prostate biopsy cores for pathological processing which will provide relevant and necessary clinical information for all potential clinical scenarios, and 3) determine the maximal number of prostate biopsy cores allowable within a specimen jar which would not preclude accurate histological evaluation of the tissue. A bibliographic search using PubMed® covering the period up to July 2012 yielded approximately 550 articles. Articles were reviewed and categorized based on which of the 3 objectives of this review was addressed. Data were extracted, analyzed and summarized. Recommendations are provided based on this literature review and our clinical experience. The use of 10 to 12-core extended sampling protocols increases cancer detection rates compared to traditional sextant sampling methods and reduces the likelihood of repeat biopsy by increasing negative predictive value, ultimately allowing more accurate risk stratification without increasing the likelihood of detecting insignificant cancers. As the number of cores increases above 12, the increase in diagnostic yield becomes marginal. Only limited evidence supports the use of initial biopsy schemes

  7. Unusual presentation and inconclusive biopsy render fibroadenoma ...

    African Journals Online (AJOL)

    Two young, nonlactating, nulliparous women presented with acutely painful breast masses. Sonographic features showed mixed echogenic masses. Core biopsies were not diagnostic, and surgical excision revealed infarcted fibroadenomas in both cases. Although fibroadenomas are common, they do not commonly infarct, ...

  8. Protective Capnothorax During Transthoracic Needle Biopsy

    Energy Technology Data Exchange (ETDEWEB)

    Kavanagh, John, E-mail: jokavana@tcd.ie; Siemienowicz, Miranda L.; Lyen, Stephen; Kandel, Sonja; Rogalla, Patrik [University of Toronto, Division of Cardiothoracic Imaging, Joint Department of Medical Imaging, University Health Network and Mount Sinai Hospital (Canada)

    2017-04-15

    PurposeTransthoracic needle biopsy (TTNB) is an established procedure in the management of pulmonary nodules. The most common complications are directly related to crossing the lung or visceral pleura during the biopsy. In this study, we describe the use of carbon dioxide instead of room air to create a protective “capnothorax” during TTNB.Materials and MethodsFive patients underwent creation of a capnothorax during TTNB. Parameters recorded were location and size of target, distance from pleura, length of procedure, volume of carbon dioxide, periprocedural complications and biopsy result.ResultsInduction of capnothorax was successful in all cases. In two patients, a continuous infusion of carbon dioxide was required to maintain an adequate volume of intrapleural gas. In two patients, the carbon dioxide resolved spontaneously and in the remaining patients it was aspirated at the end of the procedure. All biopsies were diagnostic with no periprocedural or postprocedural complications.ConclusionThis study suggests that protective iatrogenic capnothorax is a safe and effective technique during TTNB. The intrinsic properties and availability of carbon dioxide make it an attractive alternative to room air.

  9. Core biopsies of the breast: Diagnostic pitfalls

    Directory of Open Access Journals (Sweden)

    Megha Joshi

    2011-01-01

    Full Text Available The incidence of breast cancer is increasing worldwide. In this review article, the authors compare and contrast the incidence of breast cancer, and the inherent differences in the United States (US and India in screening techniques used for diagnosing breast cancer. In spite of these differences, core biopsies of the breast are common for diagnosis of breast cancer in both countries. The authors describe "Best Practices" in the reporting and processing of core biopsies and in the analysis of estrogen receptor (ER, progesterone receptor (PR, and human epidermal growth factor Receptor 2 (Her2/neu. The pitfalls in the diagnosis of fibroepithelial lesions of the breast on core biopsy are discussed, as also the significance of pseudoangiomatous stromal hyperplasia of the breast (PASH is discussed in core biopsy. In this review, the management and diagnosis of flat epithelial atypia and radiation atypia are elaborated and the use of immunohistochemistry (IHC in papillary lesions, phyllodes tumor, and complex sclerosing lesions (radial scars is illustrated. Rarer lesions such as mucinous and histiocytoid carcinoma are also discussed.

  10. Liver biopsy — the current view?

    African Journals Online (AJOL)

    1). The term. 'Chiba needle', sometimes used interchangeably with fine-needle, is also confusing, being applied to needles as large as 18 gauge. At the same time improvements in the core biopsy needles and alternatives has added to the options. Stubs needle gauge. X. Fig. 1. Needle gauge versus outer diameter in mm.

  11. Liver biopsy in liver patients with coagulopathy

    DEFF Research Database (Denmark)

    Ott, P.; Gronbaek, H.; Clausen, M.R.

    2008-01-01

    The risk of severe bleeding after liver biopsy is estimated to be 1:12,000 in patients with near normal coagulation (INR 60 billion /l). Beyond these limits, the risk is higher, but still uncertain. The Danish guidelines require INR > 1.5, platelet count

  12. Sentinel node biopsy in penile cancer

    DEFF Research Database (Denmark)

    Jakobsen, J. K.; Krarup, K. P.; Sommer, P.

    2015-01-01

    INTRODUCTION & OBJECTIVES: Nodal involvement is a strong prognosticator in penile cancer and lymph node staging is crucial. Sentinel node biopsy (SNB) has proven a useful staging tool with few complications, but evidence rely mostly on single institution publications with a short follow-up. In th......INTRODUCTION & OBJECTIVES: Nodal involvement is a strong prognosticator in penile cancer and lymph node staging is crucial. Sentinel node biopsy (SNB) has proven a useful staging tool with few complications, but evidence rely mostly on single institution publications with a short follow......-up. In this study we estimated the diagnostic accuracy of SNB in patients with squamous cell carcinoma of the penis and assessed procedure-related complications in a multicentre setting with long-term follow-up. MATERIAL & METHODS: Data was retrospectively collected from medical records by one medical doctor...... died from complications. CONCLUSIONS: To our knowledge, this is the first complete national study on sentinel node biopsy. Penile cancer sentinel node biopsy with a close follow-up is a reliable lymph node staging and has few complications in a national multicentre setting. Inguinal lymph node...

  13. Ultrasound- and MRI-Guided Prostate Biopsy

    Science.gov (United States)

    ... assistance of a nurse and an MR imaging technologist. As with the ultrasound procedure, you may receive antibiotics, sedatives and pain medication before the biopsy. The MRI-guided procedure may use contrast ... A nurse or technologist will insert an intravenous (IV) catheter into a ...

  14. Modeling CICR in rat ventricular myocytes: voltage clamp studies

    Directory of Open Access Journals (Sweden)

    Palade Philip T

    2010-11-01

    Full Text Available Abstract Background The past thirty-five years have seen an intense search for the molecular mechanisms underlying calcium-induced calcium-release (CICR in cardiac myocytes, with voltage clamp (VC studies being the leading tool employed. Several VC protocols including lowering of extracellular calcium to affect Ca2+ loading of the sarcoplasmic reticulum (SR, and administration of blockers caffeine and thapsigargin have been utilized to probe the phenomena surrounding SR Ca2+ release. Here, we develop a deterministic mathematical model of a rat ventricular myocyte under VC conditions, to better understand mechanisms underlying the response of an isolated cell to calcium perturbation. Motivation for the study was to pinpoint key control variables influencing CICR and examine the role of CICR in the context of a physiological control system regulating cytosolic Ca2+ concentration ([Ca2+]myo. Methods The cell model consists of an electrical-equivalent model for the cell membrane and a fluid-compartment model describing the flux of ionic species between the extracellular and several intracellular compartments (cell cytosol, SR and the dyadic coupling unit (DCU, in which resides the mechanistic basis of CICR. The DCU is described as a controller-actuator mechanism, internally stabilized by negative feedback control of the unit's two diametrically-opposed Ca2+ channels (trigger-channel and release-channel. It releases Ca2+ flux into the cyto-plasm and is in turn enclosed within a negative feedback loop involving the SERCA pump, regulating[Ca2+]myo. Results Our model reproduces measured VC data published by several laboratories, and generates graded Ca2+ release at high Ca2+ gain in a homeostatically-controlled environment where [Ca2+]myo is precisely regulated. We elucidate the importance of the DCU elements in this process, particularly the role of the ryanodine receptor in controlling SR Ca2+ release, its activation by trigger Ca2+, and its

  15. Positron emission mammography-guided breast biopsy.

    Science.gov (United States)

    Raylman, R R; Majewski, S; Weisenberger, A G; Popov, V; Wojcik, R; Kross, B; Schreiman, J S; Bishop, H A

    2001-06-01

    Positron emission mammography (PEM) is a technique to obtain planar images of the breast for detection of potentially cancerous, radiotracer-avid tumors. To increase the diagnostic accuracy of this method, use of minimally invasive methods (e.g., core biopsy) may be desirable for obtaining tissue samples from lesions detected with PEM. The purpose of this study was to test the capabilities of a novel method for performing PEM-guided stereotactic breast biopsies. The PEM system consisted of 2 square (10 x 10 cm) arrays of discrete scintillator crystals. The detectors were mounted on a stereotactic biopsy table. The stereotactic technique used 2 PEM images acquired at +/-15 degrees and a new trigonometric algorithm. The accuracy and precision of the guidance method was tested by placement of small point sources of (18)F at known locations within the field of view of the imager. The calculated positions of the sources were compared with the known locations. In addition, simulated stereotactic biopsies of a breast phantom consisting of a 10-mm-diameter gelatin sphere containing a concentration of (18)F-FDG consistent with that reported for breast cancer were performed. The simulated lesion was embedded in a 4-cm-thick slab of gelatin containing a commonly reported concentration of FDG, simulating a compressed breast (target-to-background ratio, approximately 8.5:1). An anthropomorphic torso phantom was used to simulate tracer uptake in the organs of a patient 1 h after a 370-MBq injection of FDG. Five trials of the biopsy procedure were performed to assess repeatability. Finally, a method for verifying needle positioning was tested. The positions of the point sources were successfully calculated to within 0.6 mm of their true positions with a mean error of +/-0.4 mm. The biopsy procedures, including the method for verification of needle position, were successful in all 5 trials in acquiring samples from the simulated lesions. The success of this new technique shows its

  16. EFFICACY OF IMMUNOHISTOCHEMISTRY IN PROSTATE NEEDLE BIOPSIES

    Directory of Open Access Journals (Sweden)

    Tameem Afroz

    2016-10-01

    Full Text Available BACKGROUND Prostate needle biopsies can pose a major diagnostic challenge when it comes to differentiating adenocarcinoma and its variants from its benign mimics. In needle biopsies, when the suspicious focus is small, morphological features may not suffice to differentiate it from its morphologic mimics like atrophy, basal cell hyperplasia, reactive inflammatory changes, seminal vesicles and adenosis. Immunohistochemical marker for basal cells, p63 and prostate cancer specific marker, Alpha-Methylacyl-CoA Racemase (AMACR help in overcoming such diagnostic dilemmas. MATERIALS AND METHODS We analysed 157 prostate core needle biopsies over a period of 2 years. Routine Hematoxylin and Eosin (H and E sections and immunohistochemical markers for basal cells (p63 and prostate cancer specific marker (AMACR were used. Prospective study was done on prostate needle core biopsies. Biopsy was done under ultrasound guidance with an 18-gauge needle. Biopsy was done in patients with raised serum PSA levels for exclusion of prostate carcinoma. RESULTS Over a period of two years, 157 prostate core needle biopsies were studied. 83 were benign lesions comprising 69 benign prostatic hyperplasias, five basal cell hyperplasias, four granulomatous lesions and three showed atrophic changes. Two biopsies morphologically resembled seminal vesicles. Prostate cancer specific marker, AMACR was negative in all, but two lesions. In these two lesions, it showed weak nonspecific staining. Basal cell marker p63 showed a continuous staining pattern highlighting the basal cells in all the 69 cases of benign prostatic hyperplasia, 5 cases of basal hyperplasia showed positivity in all the hyperplastic basal cells. In the two cases of seminal vesicles, it showed intense basal cell positivity. It showed a discontinuous pattern in two of the four granulomatous lesions and showed a weak, but a continuous staining pattern in the atrophic lesions. 74 were adenocarcinomas; the predominant

  17. The incidence of fluoroquinolone resistant infections after prostate biopsy--are fluoroquinolones still effective prophylaxis?

    Science.gov (United States)

    Feliciano, Joseph; Teper, Ervin; Ferrandino, Michael; Macchia, Richard J; Blank, William; Grunberger, Ivan; Colon, Ivan

    2008-03-01

    Fluoroquinolones have been shown to decrease infective complications after prostate biopsy. However, fluoroquinolone resistance is emerging. We quantified contemporary rates of infective complications and the incidence of fluoroquinolone resistant infections after prostate biopsy under fluoroquinolone prophylaxis. We retrospectively evaluated the records of 1,273 patients who underwent prostate biopsy at New York Harbor Veterans Affairs Hospital from January 2004 to December 2006. Patients received levofloxacin or gatifloxacin. Using the Veterans Affairs computerized patient record system we reviewed all patient visits within 1 month after prostate biopsy. Visits were queried for infective symptoms. Positive cultures were evaluated for resistance patterns. The annual and overall incidence of infective complications and fluoroquinolone resistant infections was calculated. Of 1,273 patients 31 (2.4%) presented with infective symptoms after biopsy. The overall incidence of fluoroquinolone resistant infections was 1.2% (15 cases). When stratified by year, there were statistically significant increases in the incidence of infective complications and fluoroquinolone resistance from 2004 to 2006. Of the positive cultures those from 89% of patients yielded Escherichia coli and 90% were fluoroquinolone resistant. Fluoroquinolone resistant E. coli were also resistant to gentamicin in 22% of cases, trimethoprim/sulfamethoxazole in 44%, piperacillin in 72% and ampicillin in 94%. However, 100% sensitivity was demonstrated for amikacin, ceftazidime and ceftriaxone. Fluoroquinolones are still effective as antibiotic prophylaxis for prostate biopsies but there is an increase in infective complications and fluoroquinolone resistance. When patients present with post-prostate biopsy infective symptoms, almost 50% are associated with fluoroquinolone resistant pathogens. Empirical treatment with ceftriaxone, ceftazidime or amikacin should be initiated until culture specific therapy can

  18. Cytological Sampling Versus Forceps Biopsy During Percutaneous Transhepatic Biliary Drainage and Analysis of Factors Predicting Success

    Energy Technology Data Exchange (ETDEWEB)

    Tapping, C. R.; Byass, O. R.; Cast, J. E. I., E-mail: james.cast@hey.nhs.uk [Hull Royal Infirmary, Department of Radiology (United Kingdom)

    2012-08-15

    Purpose: To assess the accuracy of cytological sampling and forceps biopsy in obstructing biliary lesions and to identify factors predictive of success. Methods: Consecutive patients (n = 119) with suspected malignant inoperable obstructive jaundice treated with percutaneous transhepatic biliary drainage during 7 years were included (60 male; mean age 72.5 years). All patients underwent forceps biopsy plus cytological sampling by washing the forceps device in cytological solution. Patient history, procedural and pathological records, and clinical follow-up were reviewed. Statistical analysis included chi-square test and multivariate regression analysis. Results: Histological diagnosis after forceps biopsy was more successful than cytology: Sensitivity was 78 versus 61%, and negative predictive value was 30 versus 19%. Cytology results were never positive when the forceps biopsy was negative. The cytological sample was negative and forceps sample positive in 2 cases of cholangiocarcinoma, 16 cases of pancreatic carcinoma, and 1 case of benign disease. Diagnostic accuracy was predicted by low bilirubin (p < 0.001), aspartate transaminase (p < 0.05), and white cell count (p {<=} 0.05). Conclusions: This technique is safe and effective and is recommended for histological diagnosis during PTBD in patients with inoperable malignant biliary strictures. Diagnostic yield is greater when bilirubin levels are low and there is no sepsis; histological diagnosis by way of forceps biopsy renders cytological sampling unnecessary.

  19. Consistent and reproducible outcomes of blastocyst biopsy and aneuploidy screening across different biopsy practitioners: a multicentre study involving 2586 embryo biopsies.

    Science.gov (United States)

    Capalbo, Antonio; Ubaldi, Filippo Maria; Cimadomo, Danilo; Maggiulli, Roberta; Patassini, Cristina; Dusi, Ludovica; Sanges, Federica; Buffo, Laura; Venturella, Roberta; Rienzi, Laura

    2016-01-01

    Is blastocyst biopsy and quantitative real-time PCR based comprehensive chromosome screening a consistent and reproducible approach across different biopsy practitioners? The blastocyst biopsy approach provides highly consistent and reproducible laboratory and clinical outcomes across multiple practitioners from different IVF centres when all of the embryologists received identical training and use similar equipment. Recently there has been a trend towards trophectoderm (TE) biopsy in preimplantation genetic screening (PGS)/preimplantation genetic diagnosis (PGD) programmes. However, there is still a lack of knowledge about the reproducibility that can be obtained from multiple biopsy practitioners in different IVF centres in relation also to blastocysts of different morphology. Although it has been demonstrated that biopsy at the blastocyst stage has no impact on embryo viability, it remains a possibility that less experienced individual biopsy practitioners or laboratories performing TE biopsy may affect certain outcomes. We investigated whether TE biopsy practitioners can have an impact on the quality of the genetic test and the subsequent clinical outcomes. This longitudinal cohort study, between April 2013 and December 2014, involved 2586 consecutive blastocyst biopsies performed at three different IVF centres and the analysis of 494 single frozen euploid embryo transfer cycles (FEET). Seven biopsy practitioners performed the blastocyst biopsies in the study period and quantitative PCR was used for comprehensive chromosome screening (CCS). The same practitioner performed both the biopsy and tubing procedures for each blastocyst they biopsied. To investigate the quality of the biopsied samples, the diagnostic rate, sample-specific concurrence and the cell number retrieved in the biopsy were evaluated for each biopsy operator. Clinical outcomes following FEET cycles were stratified by biopsy operator and compared. Cellularity of the biopsy sample was also

  20. Short interval follow-up after a benign concordant MR-guided vacuum assisted breast biopsy - is it worthwhile?

    Energy Technology Data Exchange (ETDEWEB)

    Shaylor, Sara D.; Melsaether, Amy N.; Gupta, Avani; Babb, James; Moy, Linda [NYU School of Medicine, Department of Radiology, New York, NY (United States); Heller, Samantha L. [St. George' s Healthcare Trust, Department of Radiology, London (United Kingdom); Gupta, Dipti [Northwestern Memorial Hospital, Breast and Women' s Imaging Center, Chicago, IL (United States)

    2014-06-15

    To determine the utility of short-interval follow-up after benign concordant MRI-guided breast biopsy. Institutional review board approved, retrospective review of consecutive biopsies performed over 3 years (2007-10) yielded 170 women with 188 lesions that were considered benign concordant. Indication for original study, biopsy results, follow-up recommendations, compliance and outcomes of subsequent MRI and mammography examinations were reviewed. The most common indication for breast MRI was high-risk screening 119/170 (70 %). Overall, 59 % of lesions (113/188) had follow-up MRI. Of those lesions (n = 113), 43 % (49/113) presented within 7 months, 26 % (29/113) presented within 8-13 months, 11.5 % (13/113) presented within 14-22 months, and 19 % (22/113) presented after 23 months. At initial follow-up, 37 % of lesions were stable and 61 % were decreased in size. Three lesions were recommended for excision based on follow-up imaging with one malignancy diagnosed 2 years following biopsy. One additional patient had MRI-detected bilateral cancers remote from the biopsy site 3 years after biopsy. Overall cancer yield of lesions with follow-up MRI was 0.9 % (1/113); no cancers were detected at 6 months. Our data suggests that 6-month follow-up may not be required and that annual screening MRI would be acceptable to maintain a reasonable cancer detection rate. (orig.)

  1. A two-step method for the extraction of high-quality RNA from endoscopic biopsies.

    Science.gov (United States)

    Wex, Thomas; Treiber, Gerhard; Lendeckel, Uwe; Malfertheiner, Peter

    2003-08-01

    The use of molecular techniques such as quantitative RT-PCR depends on the quality of cellular RNA. In particular, RNA extraction from endoscopic biopsies is difficult with respect to yield, and especially integrity. Endoscopic biopsies taken from the gastric antrum, corpus and duodenum were subjected to various RNA extraction protocols, and the RNA was used for quantitative RT-PCR. The subsequent use of two methods, (i) a phenol/chloroform extraction and (ii) a column-based extraction method, resulted in a yield of 4.5 microg total RNA per biopsy with reliable quality in 80% of samples. The quantitative RT-PCR analysis revealed that only RNA samples that clearly show both 18S- and 28S-RNA bands in agarose gel electrophoresis were suitable for quantitative RT-PCR as shown by expression of corpus-specific pepsinogen C-mRNA and the duodenum-specific multi-drug resistance protein-1 (mdr-1)-mRNA. In partially degraded RNA, pepsinogen C, mdr-1, or beta-actin mRNAs were still detectable, but the quantitative determination gave inconsistent data. The two-step method described here is a suitable option for extracting high-quality RNA from endoscopic biopsies when other standard protocols fail.

  2. A central swivel point in the RFC clamp loader controls PCNA opening and loading on DNA.

    Science.gov (United States)

    Sakato, Miho; O'Donnell, Mike; Hingorani, Manju M

    2012-02-17

    Replication factor C (RFC) is a five-subunit complex that loads proliferating cell nuclear antigen (PCNA) clamps onto primer-template DNA (ptDNA) during replication. RFC subunits belong to the AAA(+) superfamily, and their ATPase activity drives interactions between the clamp loader, the clamp, and the ptDNA, leading to topologically linked PCNA·ptDNA. We report the kinetics of transient events in Saccharomyces cerevisiae RFC-catalyzed PCNA loading, including ATP-induced RFC activation, PCNA opening, ptDNA binding, ATP hydrolysis, PCNA closing, and PCNA·ptDNA release. This detailed perspective enables assessment of individual RFC-A, RFC-B, RFC-C, RFC-D, and RFC-E subunit functions in the reaction mechanism. Functions have been ascribed to RFC subunits previously based on a steady-state analysis of 'arginine-finger' ATPase mutants; however, pre-steady-state analysis provides a different view. The central subunit RFC-C serves as a critical swivel point in the clamp loader. ATP binding to this subunit initiates RFC activation, and the clamp loader adopts a spiral conformation that stabilizes PCNA in a corresponding open spiral. The importance of RFC subunit response to ATP binding decreases as RFC-C>RFC-D>RFC-B, with RFC-A being unnecessary. RFC-C-dependent activation of RFC also enables ptDNA binding, leading to the formation of the RFC·ATP·PCNA(open)·ptDNA complex. Subsequent ATP hydrolysis leads to complex dissociation, with RFC-D activity contributing the most to rapid ptDNA release. The pivotal role of the RFC-B/C/D subunit ATPase core in clamp loading is consistent with the similar central location of all three ATPase active subunits of the Escherichia coli clamp loader. Copyright © 2011 Elsevier Ltd. All rights reserved.

  3. Pre-Descemets endothelial keratoplasty: the PDEK clamp for successful PDEK.

    Science.gov (United States)

    Dua, H S; Said, D G

    2017-07-01

    PurposeTo design and produce a clamp that enables good handling of donor sclera-corneal disks, allows air to be injected in the corneal stroma and consistently provides pre-Descemets endothelial keratoplasty (PDEK) tissue by creation of a type-1 big bubble (BB) avoiding a type-2BB by shutting the fenestrations in the periphery of the pre-Descemets layer and preventing escape of air.Patients and methodsA clamp with spring loaded handles attached to two rings of 9 mm diameter and 1 mm width with a side port for insertion of a needle for air injection was designed and produced. The clamp was tested in 20 human donor sclera-corneal disks and refined over three prototypes. The final design was used for PDEK in 8 patients.ResultsThe clamp was able to prevent any escape of air or the formation of a type-2BB. By preventing air leak, it provided better control over the volume of air injected allowing for consistent formation of a type-1BB, which could be expanded to its full diameter by advancing the tip of the needle into the bubble cavity. Centration of tissue in the clamp was important. The clamp was used successfully to obtain PDEK tissue from 8 donor sclara-corneal disks for transplant in three eyes with pseudophakic bullous keratopathy and five eyes with pseudophakia and Fuchs' endothelial dystrophy.ConclusionThe PDEK clamp is a simple and useful instrument that will give surgeons the confidence of consistently obtaining PDEK tissue with ease and without the risk of separating the Descemets membrane in a type-2BB.

  4. Conformational Changes of the Clamp of the Protein Translocation ATPase SecA.

    Science.gov (United States)

    Chen, Yu; Bauer, Benedikt W; Rapoport, Tom A; Gumbart, James C

    2015-07-17

    Post-translational protein translocation across the bacterial plasma membrane is mediated by the interplay of the SecA ATPase and the protein-conducting SecY channel. SecA consists of several domains, including two nucleotide-binding domains (NBD1 and NBD2), a polypeptide cross-linking domain (PPXD), a helical scaffold domain (HSD), and a helical wing domain (HWD). PPXD, HSD, and NBD2 form a clamp that positions the polypeptide substrate above the channel so that it can be pushed into the channel by a two-helix finger of the HSD. How the substrate is accommodated in the clamp during translocation is unclear. Here, we report a crystal structure of Thermotoga maritima SecA at 1.9 Å resolution. Structural analysis and free-energy calculations indicate that the new structure represents an intermediate state during the transition of the clamp from an open to a closed conformation. Molecular dynamics simulations show that closure of the clamp occurs in two phases, an initial movement of PPXD, HSD, and HWD as a unit, followed by a movement of PPXD alone toward NBD2. Simulations in the presence of a polypeptide chain show that the substrate associates with the back of the clamp by dynamic hydrogen bonding and that the clamp is laterally closed by a conserved loop of the PPXD. Mutational disruption of clamp opening or closure abolishes protein translocation. These results suggest how conformational changes of SecA allow substrate binding and movement during protein translocation. Copyright © 2015 Elsevier Ltd. All rights reserved.

  5. Safety evaluation of large external fixation clamps and frames in a magnetic resonance environment.

    Science.gov (United States)

    Luechinger, Roger; Boesiger, Peter; Disegi, John A

    2007-07-01

    Large orthopedic external fixation clamps and related components were evaluated for force, torque, and heating response when subjected to the strong electromagnetic fields of magnetic-resonance (MR) imaging devices. Forces induced by a 3-Tesla (T) MR scanner were compiled for newly designed nonmagnetic clamps and older clamps that contained ferromagnetic components. Heating trials were performed in a 1.5 and in a 3 T MR scanner with two assembled external fixation frames. Forces of the newly designed clamps were more than a factor 2 lower as the gravitational force on the device whereas, magnetic forces on the older devices showed over 10 times the force induced by earth acceleration of gravity. No torque effects could be found for the newly designed clamps. Temperature measurements at the tips of Schanz screws in the 1.5 T MR scanner showed a rise of 0.7 degrees C for a pelvic frame and of 2.1 degrees C for a diamond knee bridge frame when normalized to a specific absorption rate (SAR) of 2 W/kg. The normalized temperature increases in the 3 T MR scanner were 0.9 degrees C for the pelvic frame and 1.1 degrees C for the knee bridge frame. Large external fixation frames assembled with the newly designed clamps (390 Series Clamps), carbon fiber reinforced rods, and implant quality 316L stainless steel Schanz screws met prevailing force and torque limits when tested in a 3-T field, and demonstrated temperature increase that met IEC-60601 guidelines for extremities. The influence of frame-induced eddy currents on the risk of peripheral nerve stimulation was not investigated. Copyright 2006 Wiley Periodicals, Inc.

  6. Modelling the clamping force distribution among chips in press-pack IGBTs using the finite element method

    DEFF Research Database (Denmark)

    Hasmasan, Adrian Augustin; Busca, Christian; Teodorescu, Remus

    2012-01-01

    for the chip, because it influences contact electrical resistance, contact thermal resistance and power cycling capability. Ideally, the clamping force should be equally distributed among chips, in order to maximize the reliability of the PP IGBT. The model is built around a hypothetical PP IGBT with 9 chips......In this paper, a FEM (finite element method) based mechanical model for PP (press-pack) IGBTs (insulated gate bipolar transistors) is presented, which can be used to calculate the clamping force distribution among chips under various clamping conditions. The clamping force is an important parameter......, and it has numerous simplifications in order to reduce the simulation time as much as possible. The developed model is used to analyze the clamping force distribution among chips, in various study cases, where uniform and non-uniform clamping pressures are applied on the studied PP IGBT....

  7. A single electrode voltage, current- and patch-clamp amplifier with complete stable series resistance compensation.

    Science.gov (United States)

    Strickholm, A

    1995-01-01

    An input headstage for single electrode voltage and current clamping is described which permits selecting desired operational modes during an experiment. These include cell attached or whole cell patch clamping, single micro-electrode voltage or current clamping, potential recording, iontophoresis and voltammetry. Input electrode series resistance with the electrode inserted in a cell or during whole cell patch clamping can be measured at any time. The unique circuitry allows complete compensation of the series resistance with high frequency response. The input series electrode resistance can also vary considerably around an initially set 100% compensation with intrinsic stability. An accelerator 'supercharger' or 'booster circuit' is included which can shorten the rise time of membrane potential to the command potential by a hundredfold. This improves the recording of early ion channel currents. Feedback resistors are selected remotely for the specific experimental need. Signal resolution in patch clamping is that expected from the thermal noise of the feedback resistor and electrode to membrane seal resistance. This headstage circuitry design thus allows interchangeable modes of operation and parameters during an experiment to obtain optimal conditions for signal detection and frequency response.

  8. Application of Automated Image-guided Patch Clamp for the Study of Neurons in Brain Slices.

    Science.gov (United States)

    Wu, Qiuyu; Chubykin, Alexander A

    2017-07-31

    Whole-cell patch clamp is the gold-standard method to measure the electrical properties of single cells. However, the in vitro patch clamp remains a challenging and low-throughput technique due to its complexity and high reliance on user operation and control. This manuscript demonstrates an image-guided automatic patch clamp system for in vitro whole-cell patch clamp experiments in acute brain slices. Our system implements a computer vision-based algorithm to detect fluorescently labeled cells and to target them for fully automatic patching using a micromanipulator and internal pipette pressure control. The entire process is highly automated, with minimal requirements for human intervention. Real-time experimental information, including electrical resistance and internal pipette pressure, are documented electronically for future analysis and for optimization to different cell types. Although our system is described in the context of acute brain slice recordings, it can also be applied to the automated image-guided patch clamp of dissociated neurons, organotypic slice cultures, and other non-neuronal cell types.

  9. Functional dissection of synaptic circuits: in vivo patch-clamp recording in neuroscience.

    Science.gov (United States)

    Tao, Can; Zhang, Guangwei; Xiong, Ying; Zhou, Yi

    2015-01-01

    Neuronal activity is dominated by synaptic inputs from excitatory or inhibitory neural circuits. With the development of in vivo patch-clamp recording, especially in vivo voltage-clamp recording, researchers can not only directly measure neuronal activity, such as spiking responses or membrane potential dynamics, but also quantify synaptic inputs from excitatory and inhibitory circuits in living animals. This approach enables researchers to directly unravel different synaptic components and to understand their underlying roles in particular brain functions. Combining in vivo patch-clamp recording with other techniques, such as two-photon imaging or optogenetics, can provide even clearer functional dissection of the synaptic contributions of different neurons or nuclei. Here, we summarized current applications and recent research progress using the in vivo patch-clamp recording method and focused on its role in the functional dissection of different synaptic inputs. The key factors of a successful in vivo patch-clamp experiment and possible solutions based on references and our experiences were also discussed.

  10. Novel Low Loss Active Voltage Clamp Circuit for Series Connection of RCGCT thyristors

    Science.gov (United States)

    Ito, Hiroshi; Suzuki, Akihiro; Iwata, Akihiko

    This paper describes novel low loss active voltage clamp circuits for the series connection of RCGCT thyristors. For high voltage converters the series connection of power semiconductor devices is an essential technique for direct switching of high voltages. Several protection circuits have been applied to the series connection of RCGCT thyristors such as CRD snubber circuits which suppress over-voltages across RCGCT thyristors, and voltage balancing resistors to equalize voltage sharing in steady states. However, significant losses in these protection circuits lower the converter’s efficiency. We propose novel low-loss protection circuits, which have active voltage clamp snubber circuits and static voltage balancing circuits. The clamp capacitor voltage of the active voltage clamp snubber circuits are designed to be higher than the equally divided DC-Link voltage. This method can reduce the loss of the clamp circuit to no more than 1/10 of that of the conventional CRD snubber. Also the static voltage balancing circuits compensate for the voltage imbalance generated by the difference in the leakage current between the series connection RCGCT thyristors.

  11. PATHOMORPHOLOGY OF ZERO BIOPSIES OF DONOR KIDNEYS

    Directory of Open Access Journals (Sweden)

    M. L. Arefjev

    2011-01-01

    Full Text Available There is well known fact that kidney transplants from Extended Criteria Donors may increase risk of De- layed Graft Function and Primary Non-Function of transplants. We have collected and tested 65 «zero» kidney biopsies from cadaver donors aged from 19 to 71 years old. In the pool of elderly donors who died from cerebrovascular accident the frequency of nephrosclerosis presentation was higher than in donors of yonger age who died from craniocephalic trauma. Nevertheless in the general donor pool the number of sclerosed glomeruli was no more than 12%. We did not meet at all in the whole volume of material any bi- opsy with the severe degree of arteriosclerosis. The «zero» biopsies of cadaver kidneys is quite usable and unexpensive tool to measure the degree of nephrosclerosis in order to exclude kidneys which are not fitable for transplantation. 

  12. Liver CT-guided aspirative biopsies

    International Nuclear Information System (INIS)

    Santos, Gilda da Cunha; Carvalho, Leda Viegas de; Chojniak, Rubens; Morini, Sandra Regina

    1996-01-01

    Sixty-eight CT-guided aspirative biopsies of hepatic nodules were performed at A.C. Camargo Hospital, Sao Paulo, Brazil, from 1992 to 1995. The cases were distributed as follow: 44(64.7%) with a positive diagnosis for neoplastic cells, 6(8.8%) with a negative diagnosis, and 14 (20.5%) with insufficient material. Of the positive cases (primary neoplasias and metastases), the cytological diagnosis was achieved in 39 cases. There were 36 cases of carcinoma (7 hepato carcinomas, 18 adenocarcinomas, 1 small cell carcinoma and 10 cases of unspecified differentiation), 2 cases of melanoma and 1 case of melanoma and 1 case of sarcoma. The correlation with histopathological exams showed no false positive cases and concordance between cytological and histopathological diagnosis. The results demonstrate that CT-guided aspirative biopsy of hepatic nodules permits a rapid diagnosis of neoplastic lesions, especially for the evaluation of metastases. (author)

  13. The interplay of primer-template DNA phosphorylation status and single-stranded DNA binding proteins in directing clamp loaders to the appropriate polarity of DNA.

    Science.gov (United States)

    Hayner, Jaclyn N; Douma, Lauren G; Bloom, Linda B

    2014-01-01

    Sliding clamps are loaded onto DNA by clamp loaders to serve the critical role of coordinating various enzymes on DNA. Clamp loaders must quickly and efficiently load clamps at primer/template (p/t) junctions containing a duplex region with a free 3'OH (3'DNA), but it is unclear how clamp loaders target these sites. To measure the Escherichia coli and Saccharomyces cerevisiae clamp loader specificity toward 3'DNA, fluorescent β and PCNA clamps were used to measure clamp closing triggered by DNA substrates of differing polarity, testing the role of both the 5'phosphate (5'P) and the presence of single-stranded binding proteins (SSBs). SSBs inhibit clamp loading by both clamp loaders on the incorrect polarity of DNA (5'DNA). The 5'P groups contribute selectivity to differing degrees for the two clamp loaders, suggesting variations in the mechanism by which clamp loaders target 3'DNA. Interestingly, the χ subunit of the E. coli clamp loader is not required for SSB to inhibit clamp loading on phosphorylated 5'DNA, showing that χ·SSB interactions are dispensable. These studies highlight a common role for SSBs in directing clamp loaders to 3'DNA, as well as uncover nuances in the mechanisms by which SSBs perform this vital role. © The Author(s) 2014. Published by Oxford University Press on behalf of Nucleic Acids Research.

  14. A position paper on standardizing the nonneoplastic kidney biopsy report

    NARCIS (Netherlands)

    A. Chang (Anthony); I.W. Gibson (Ian); A.H. Cohen (Arthur); J.J. Weening (Jan); J.C. Jennette (Charles); A.B. Fogo (Agnes)

    2012-01-01

    textabstractThe biopsy report for nonneoplastic kidney diseases represents a complex integration of clinical data with light, immunofluorescence, and electron microscopic findings. Practice guidelines for the handling and processing of the renal biopsy have previously been created. However, specific

  15. Systemic Air Embolism After CT-guided Lung Biopsy

    Science.gov (United States)

    2017-11-27

    Patients Who Underwent Percutaneous Lung Biopsy Under CT Guidance; Patients Who Presented Systemic Air Embolism After Percutaneous Lung Biopsy Under CT Guidance Depicted at the Time of the Procedure on a Whole Thoracic CT

  16. Clinical heart transplantation without routine endomyocardial biopsy.

    Science.gov (United States)

    Warnecke, H; Müller, J; Cohnert, T; Hummel, M; Spiegelsberger, S; Siniawski, H K; Lieback, E; Hetzer, R

    1992-01-01

    In a prospective clinical study, routine endomyocardial biopsy (EMB) for early detection of cardiac allograft rejection was replaced by two noninvasive diagnostic techniques. In 32 patients who underwent transplantation during a 6-month period, intramyocardial electrogram (IMEG) amplitude was recorded with the telemetry function of a dual-chamber pacemaker system. An amplitude decrease of more than 8% below the individual range of variability in overnight long-term recordings served as an indicator of rejection. A prolongation of the time interval Te--the time span between maximal posterior wall contraction and peak retraction velocity--of more than 20 msec was used as an additional indicator of rejection-related left ventricular dysfunction. For patient safety, routine EMBs were still performed but remained undisclosed to the transplantation team. The pathologist was asked to intervene in cases of discrepancies between biopsy results and medical decisions, but no such intervention was necessary. Twenty-seven rejection episodes were treated medically, of which 22 were diagnosed noninvasively. In four patients, EMB, ordered because noninvasive parameters remained inconclusive, led to medical treatment. No false negative IMEG results were observed. Retrospective correlation with rejection gave a 100% negative predictive value for IMEG and a 96.9% negative predictive value for echocardiographic diagnosis. We conclude that omission of a schedule of routine biopsies is justified, if the described techniques of IMEG and echocardiography are meticulously applied and indicate normal cardiac function. EMB remains indicated if noninvasive parameters are not conclusive or if false-positive IMEG results, which were observed in the presence of infection or arrhythmias, are suspected. The frequency of EMB can be reduced by 90%, compared to conventional routine biopsy schedules. Diagnostic safety is increased because the additional information gained from IMEG and

  17. Breast MR biopsy: Pathological and radiological correlation

    International Nuclear Information System (INIS)

    Dratwa, Chloe; Chopier, Jocelyne; Jalaguier-Coudray, Aurelie; Thomassin-Piana, Jeanne; Gonin, Julie; Antoine, Martine; Trop, Isabelle; Darai, Emile; Thomassin-Naggara, Isabelle

    2016-01-01

    To identify pathological features for sample analysis of magnetic resonance imaging-guided vaccum-assisted breast biopsy (MRIgVaBB) to optimize radio pathological correlation and identify discordant benign result. Databases of two centres were queried to identify MRIgVaBB performed between January 2009 and February 2013. A cohort of 197 women (mean age: 54.5 years (24-77)) with 208 lesions was identified. We retrospectively analyzed all prebiopsy MRI examinations according to the new BI-RADS lexicon, and all biopsy samples to describe the lesion of interest, its interface with the surrounding breast tissue and other associated features. The malignancy rate was 26.0 % (54/208) with an underestimation rate of 15.67 % (5/32). A visible interface at pathology between a biopsied lesion and the surrounding breast tissue was more frequently identified in mass enhancement compared to NME or focus (p = 0.0003). Regional NME was correlated with a high degree of fibrosis (p = 0.001) and the presence of PASH (p = 0.0007). Linear or segmental NME was correlated with the presence of periductal mastitis (p = 0.0003). The description of a visible interface between the target lesion and the surrounding tissue is crucial to confirm the correct targeting of an MR mass or a NME. (orig.)

  18. Analysis of bronchial biopsies in chronic cough.

    Science.gov (United States)

    Macedo, Patricia; Zhang, Qingling; Saito, Junpei; Liang, Zhike; Ffolkes, Lorrette; Nicholson, Andrew G; Chung, Kian Fan

    2017-06-01

    Chronic cough is commonly associated with asthma, gastro-oesophageal reflux disease and postnasal drip, but in a significant proportion, no associated cause can be found. We determined whether examination of bronchial biopsies would be useful in determining the cause associated with chronic cough. 100 consecutive patients referred to a specialist cough clinic underwent a systematic assessment including a fiberoptic bronchoscopy for bronchial biopsies. In 38 patients, treatment of associated causes led to amelioration of cough ('explained') and in 62, there was no association or improvement ('idiopathic'). The latter group had a longer duration of cough, a lower FeNO levels and a more sensitive capsaicin cough response, with an increase in basement membrane thickness with no differences in goblet cell hyperplasia and seromucinous hyperplasia, and in lymphocyte, neutrophil and eosinophil counts. The duration of cough was inversely correlated with the degree of neutrophil infiltration. We conclude that pathological examination of bronchial biopsies is unlikely to be useful in the diagnosis of chronic cough in non-smokers. Copyright © 2017 The Authors. Published by Elsevier Ltd.. All rights reserved.

  19. Diagnostic yield of fine needle aspiration biopsy in HIV-infected ...

    African Journals Online (AJOL)

    2014-01-27

    Jan 27, 2014 ... Statistics and Actuarial Sciences, Stellenbosch. University, for the data analysis. References. 1. Reuter H, Wood R, Schaaf HS, Donald PR. Overview of. Extrapulmonary Tuberculosis in Adults and Children. In: Schaaf. HS, Zumla A, eds. Tuberculosis: A Comprehensive Clinical. Reference. Atlanta: Saunders ...

  20. The interpretation of glucose clamp studies of long-acting insulin analogues: from physiology to marketing and back.

    Science.gov (United States)

    Swinnen, S G H A; Holleman, F; DeVries, J H

    2008-10-01

    Glucose clamp studies assessing the time-action profile of long-acting insulin analogues have reported conflicting results. In an attempt to reconcile the data, we organised an expert meeting of four leading European clamp groups, during which consensus was reached on some but not all points discussed. In this paper, which reflects our personal views only, we aim to provide guidance for readers and reviewers on the interpretation of this type of clamp study and to clarify its inherent limitations.Glucose clamp studies are either performed manually or using an automated procedure, but differences in clamp methodology hardly seem a satisfactory explanation for the conflicting results. (Un)conscious investigator-related bias, especially during manual studies, cannot be ruled out, despite attempts at blinding the study insulin during the clamp.The duration of action of study insulins is influenced by many factors, such as glucose and insulin levels prior to injection, endogenous insulin secretion, insulin dose, definitions used for onset and end of action, and insulin sensitivity (which is influenced by the necessity of fasting during the clamp). These factors limit the translation of clamp study results into daily practice.Because of the inherent limitations of the glucose clamp technique and the lack of reproducibility of the outcomes, its results should be regarded as no more than an indication of the clinical action profile of long-acting insulin preparations.

  1. Design and fabrication of a planar patch-clamp substrate using a silicon-on-insulator wafer

    International Nuclear Information System (INIS)

    Zhang Zhenlong; Liu Xiangyang; Mao Yanli

    2009-01-01

    The planar patch-clamp technique has been applied to high throughput screening in drug discovery. The key feature of this technique is the fabrication of a planar patch-clamp substrate using appropriate materials. In this study, a planar patch-clamp substrate was designed and fabricated using a silicon-on-insulator (SOI) wafer. The access resistance and capacitance of SOI-based planar patch-clamp substrates are smaller than those of bulk silicon-based planar substrates, which will reduce the distributed RC noise.

  2. The essential Drosophila CLAMP protein differentially regulates non-coding roX RNAs in male and females.

    Science.gov (United States)

    Urban, Jennifer A; Doherty, Caroline A; Jordan, William T; Bliss, Jacob E; Feng, Jessica; Soruco, Marcela M; Rieder, Leila E; Tsiarli, Maria A; Larschan, Erica N

    2017-06-01

    Heterogametic species require chromosome-wide gene regulation to compensate for differences in sex chromosome gene dosage. In Drosophila melanogaster, transcriptional output from the single male X-chromosome is equalized to that of XX females by recruitment of the male-specific lethal (MSL) complex, which increases transcript levels of active genes 2-fold. The MSL complex contains several protein components and two non-coding RNA on the X ( roX) RNAs that are transcriptionally activated by the MSL complex. We previously discovered that targeting of the MSL complex to the X-chromosome is dependent on the chromatin-linked adapter for MSL proteins (CLAMP) zinc finger protein. To better understand CLAMP function, we used the CRISPR/Cas9 genome editing system to generate a frameshift mutation in the clamp gene that eliminates expression of the CLAMP protein. We found that clamp null females die at the third instar larval stage, while almost all clamp null males die at earlier developmental stages. Moreover, we found that in clamp null females roX gene expression is activated, whereas in clamp null males roX gene expression is reduced. Therefore, CLAMP regulates roX abundance in a sex-specific manner. Our results provide new insights into sex-specific gene regulation by an essential transcription factor.

  3. Is extended biopsy protocol justified in all patients with suspected ...

    African Journals Online (AJOL)

    2012-01-03

    Jan 3, 2012 ... of both sextant and extended 10-core biopsy protocols at different PSA levels and digital rectal examination (DRE) ... Key words: Biopsy, detection rate, digital rectal examination, extended, prostate cancer, prostate-specific antigen, sextant .... Indications for prostate biopsy were elevated PSA alone in.

  4. Renal biopsy in childhood nephrotic syndrome

    International Nuclear Information System (INIS)

    Hafeez, F.; Rasool, F.; Hamid, T.

    2002-01-01

    Objective: To study the histopathological pattern in childhood nephrotic syndrome who underwent biopsy, and the safety of the procedure. Design: A prospective study. Patients and Duration of Study: Nephrology Department, The Children Hospital and the Institute of Child Health, Lahore form July 1999 to June 2001. Subjects and method: Ultrasound guided percutaneous renal biopsy was done in nephrotics, who were (a) steroid resistant (SR), (b) wit signs of steroid toxicity (c) deranged renal functions, hypocomplementemia, gross haematuria (d) signs of systemic disease. Patients with congenital nephrosis were not included. The biopsy material was examined under light microscope after staining with H and E and PAS. Results: Thirty-five patients with male to female ratio of 2.5:1 in the age range of 1-1/2 years 14 years (mean 6.9 years) underwent renal biopsy. Fifteen (42.9)% were SRNS (Steroid resistant nephritic syndrome), while 7 (20%) had signs of steroid toxicity and deranged renal functions each. Gross haematuria and signs suggestive of systemic disease were present in 3 (8.6%) Patients in each group. The most predominant histopathology was measangioproliferative in 12 (34.2%) followed by MPGN (Membranoproliferative glomerulonephritis) in 7 (20%), MCNS (Minimal change nephrotic syndrome) in 6 (17.1%), membranous nephropathy in 3 (8.85%), FSGS (Focal segmental glomeurlosclerosis) and focal proliferative GN (Glomerulonephritis) was seen in 1 (2.85%) each. Among the steroid resistant patients the most common histopathology was mesangioproliferative GN in 7 (46.6%) followed by MCNS and FSGS in 2 (13.2%) each. Overall complication rate was 17.2% in 6 with gross haematuria and flank pain seen in 2 (5.7%), while small perirenal haematoma and urinary retention occurred in 1 (2.85%) patients in each group. Conclusion: Percutaneous renal biopsy is a safe procedure with minimal risk of complications, it helps the nephrologist to find out the underlying histopathology for the

  5. The Effect of an Added Mass on the Frequency Shifts of a Clamped-Clamped Microbeam for Bio-Mass Detection

    KAUST Repository

    Bouchaala, Adam M.

    2016-12-05

    We present analytical formulations to calculate the induced resonance frequency shifts of electrically actuated clamped-clamped microbeams due to an added mass. Based on the Euler-Bernoulli beam theory, we investigate the linear dynamic responses of the beams added masses, which are modeled as discrete point masses. Analytical expressions based on perturbation techniques and a one-mode Galerkin approximation are developed to calculate accurately the frequency shifts under a DC voltage as a function of the added mass and position. The analytical results are compared to numerical solution of the eigenvalue problem. Results are shown for the fundamental as well as the higher-order modes of the beams. The results indicate a significant increase in the frequency shift, and hence the sensitivity of detection, when scaling down to nano scale and using higher-order modes.

  6. Flange joint system for SRF cavities utilizing high force spring clamps for low particle generation

    Energy Technology Data Exchange (ETDEWEB)

    None

    2017-09-05

    A flange joint system for SRF cavities. The flange joint system includes a set of high force spring clamps that produce high force on the simple flanges of Superconducting Radio Frequency (SRF) cavities to squeeze conventional metallic seals. The system establishes the required vacuum and RF-tight seal with minimum particle contamination to the inside of the cavity assembly. The spring clamps are designed to stay within their elastic range while being forced open enough to mount over the flange pair. Upon release, the clamps have enough force to plastically deform metallic seal surfaces and continue to a new equilibrium sprung dimension where the flanges remain held against one another with enough preload such that normal handling will not break the seal.

  7. Artifactual voltage response recorded from hair cells with patch-clamp amplifiers.

    Science.gov (United States)

    Masetto, S; Weng, T; Valli, P; Correia, M J

    1999-06-23

    Patch-clamp amplifiers (PCAs) are commonly used to characterize voltage- and current-clamp responses in the same cell. However, the cell membrane voltage response can be severely distorted by PCAs working in the current-clamp mode. Here we compare the voltage response of pigeon semicircular canal hair cells in situ, recorded with two different PCAs, and with a classic microelectrode bridge amplifier (BA). We found that the voltage response of hair cells recorded with PCAs differed significantly from that recorded with the BA. The true hair cell membrane voltage response to positive current steps was characterized by a strongly damped oscillation, whose frequency and duration depended on hair cell location in the sensory crista ampullaris.

  8. A simple technique to measure regional cerebral blood flow during intravascular ballon clamping

    International Nuclear Information System (INIS)

    Furuhata, Shigeru; Kubo, Atsushi; Kawase, Takeshi; Ibata, Yukio; Toya, Shigeo

    1988-01-01

    A case of giant internal carotid ophthalmic aneurysm was presented. In order to clarify whether the patient could tolerate carotid occlusion, a ballon clamping test was performed before surgery. The cerebral blood flow was measured using early imaging by single photon emission computed tomography (SPECT) with N-isopropyl-(iodine-123)-p-iodoamphetamine ( 123 I-IMP). When the ballon clamping test was performed the tracer was injected, and scanning was performed 35 minutes after removing the catheter. This tracer enabled a 'memory of blood flow' during temporary ischemia to determine the character of quick diffusion and slow wash out, that could not be performed by other methods of cerebral blood flow measurement. SPECT with 123 I-IMP can simplify the measurement of cerebral blood flow during the balloon clamping test. (author)

  9. Promoting physiologic transition at birth: re-examining resuscitation and the timing of cord clamping.

    Science.gov (United States)

    Niermeyer, Susan; Velaphi, Sithembiso

    2013-12-01

    Delayed clamping of the umbilical cord is recommended for term and preterm infants who do not require resuscitation. However, the approach to the newly born infant with signs of fetal compromise, prematurity and extremely low birthweight, or prolonged apnea is less clear. Human and experimental animal data show that delaying the clamping of the umbilical cord until after the onset of respirations promotes cardiovascular stability in the minutes immediately after birth. Rather than regarding delayed cord clamping as a fixed time period before resuscitation begins, a more physiologic concept of transition at birth should encompass the relative timing of onset of respirations and cord occlusion. Further research to explore the potential benefits of resuscitation with the cord intact is needed. Copyright © 2013 Elsevier Ltd. All rights reserved.

  10. Significance of Shrinkage Induced Clamping Pressure in Fiber-Matrix Bonding in Cementitious Composite Materials

    DEFF Research Database (Denmark)

    Stang, Henrik

    1996-01-01

    used in high performance cementitious composite materials.Assuming a Coulomb type of friction on the fiber/matrix interface andusing typical values for the frictional coefficient it is shownthat the shrinkage induced clamping pressure could be one of the mostimportant factors determining the frictional......The present paper accesses the significance of shrinkage inducedclamping pressure in fiber/matrix bonding mechanisms incementitious composite materials. The paper contains a description of an experimental setup whichallows mbox{measurement} of the clamping pressure which develops on anelastic...... inhomogeneity embedded in a matrix consisting of acementitious material undergoing shrinkage during hydration(autogenous shrinkage). Furthermore, the paperpresents the analysis necessary to perform an interpretation of the experimental results and which allows for thedetermination of the clamping pressure...

  11. Curvature-electric effects in artificial and natural membranes studied using patch-clamp techniques.

    Science.gov (United States)

    Petrov, A G; Ramsey, R L; Usherwood, P N

    1989-01-01

    Methods for applying sound pressure to membrane patches formed at the tips of patch-clamp pipettes have been developed. Artificial membrane patches were formed from diphytanoyl phosphatidylcholine using a pipette dipping technique. Natural membrane patches were excised (inside-out mode) from collagenase-treated locust muscle membrane. Curvature-electric signals were registered under both voltage clamp and current clamp conditions. The phenomenon of flexoelectricity in membranes has previously been attributed to curvature-induced polarization originating from the liquid crystalline properties of membranes. The estimated magnitude (2 x 10(-18) C) of the flexoelectric coefficient of the artificial lipid bilayers is consistent with previous findings while that of the muscle membrane was in certain cases several times larger. The present study is the first to report on flexoelectricity in a natural membrane and raises the question of the biological significance of this phenomenon.

  12. Influence of non-steady state during isoglycemic hyperinsulinemic clamp in hypertension. A LIFE substudy

    DEFF Research Database (Denmark)

    Olsen, M H; Andersen, U B; Wachtell, K

    1999-01-01

    We wanted to investigate whether time to steady state was reached within 2 h of insulin infusion during isoglycemic hyperinsulinemic clamp, comparing the glucose uptake index (M/IG) with Bergman's insulin sensitivity index (Sip). We performed a 2-h oral glucose tolerance test and a 3-h isoglycemic...... hyperinsulinemic clamp in 26 young, healthy subjects and 43 elderly patients with unmedicated essential hypertension and left ventricular hypertrophy. The 3-h Sip correlated strongly with the 2-h M/IG in the patients (r = 0.88, p .... Because the 2-h M/IG correlated strongly with the 3-h Sip with relatively narrow limits of agreement, it is a good measure of insulin sensitivity. However, a 2-h clamp results in lower insulin sensitivity values in elderly, hypertensive patients due to the fact that steady state is not reached...

  13. The evaluation on clamping force of high strength bolts by length parameter

    International Nuclear Information System (INIS)

    Kim, Kang-Seok; Nah, Hwan-Seon; Lee, Hyeon-Ju; Lee, Kang-Min

    2009-01-01

    It has been reported that the length parameter of high strength bolts results in the variance in tension loads. The required turn for each length is specified in AISC RCSC specification. This study was focused on evaluating any influence on the clamping torque subjected to length parameter of high strength bolts. The two kinds of high strength bolts of specimen are as follows; High Strength Hexagon bolt defined on ASTM A490 and Torque Shear Bolt on KS B 2819. The length parameter ranged from 60mm(3d) to 140mm(7d). The torque, turn of nut and the clamping force were analyzed to review whether length parameter can be affected on the required tension load. To test whether the length parameter has an impact on the torque and turn of nut for the required strength and clamping force, statistical analysis is carried out. (author)

  14. Modeling error and apparent isotope discrimination confound estimation of endogenous glucose production during euglycemic glucose clamps

    International Nuclear Information System (INIS)

    Finegood, D.T.; Bergman, R.N.; Vranic, M.

    1988-01-01

    We previously demonstrated that conventional tracer methods applied to euglycemic-hyperinsulinemic glucose clamps result in substantially negative estimates for the rate of endogenous glucose production, particularly during the first half of 180-min clamps. We also showed that addition of tracer to the exogenous glucose infusate resulted in nonnegative endogenous glucose production (Ra) estimates. In this study, we investigated the underlying cause of negative estimates of Ra from conventional clamp/tracer methods and the reason for the difference in estimates when tracer is added to the exogenous glucose infusate. We performed euglycemic-hyperinsulinemic (300-microU/ml) clamps in normal dogs without (cold GINF protocol, n = 6) or with (hot GINF protocol, n = 6) tracer (D-[3-3H]glucose) added to the exogenous glucose infusate. In the hot GINF protocol, sufficient tracer was added to the exogenous glucose infusate such that arterial plasma specific activity (SAa) did not change from basal through the clamp period (P greater than .05). In the cold GINF studies, plasma SAa fell 81 +/- 2% from the basal level by the 3rd h of clamping. We observed a significant, transient, positive venous-arterial difference in specific activity (SAv-SAa difference) during the cold GINF studies. The SAv-SAa difference reached a peak of 27 +/- 6% at 30 min and diminished to a plateau of 7 +/- 1% between 70 and 180 min. We also observed a positive but constant SAv-SAa difference (4.6 +/- 0.2% between 10 and 180 min) during the hot GINF studies

  15. Safety and effectiveness of percutaneous biopsy of focal splenic lesions under ultrasonographic guidance

    Energy Technology Data Exchange (ETDEWEB)

    Han, Hyun Young; Kim, Joo Heon [Eulji University College of Medicine, Taejeon (Korea, Republic of); Shin, Kyung Sook [Chungnam National University College of Medicine, Taejeon (Korea, Republic of)

    2002-06-15

    To evaluate the diagnostic yield and safety of ultrasound (US)-guided percutaneous needle biopsy for the diagnosis of focal splenic lesions. US guided, automated needle biopsy using an 18-gauge cutting needle was performed in 11 patients, consisted of nine men and two women (mean age=49 years), with focal splenic lesions detected on the CT or US. Six patients (55%) had multiple lesions while five (45%) had a single lesion. Two of eleven patients had splenomegaly. None of 11 patients had the prior diagnosis of extrasplenic or hematopoietic malignancies. The biopsy was considered successful if a specific pathological diagnosis was possible. The diagnostic yield and frequency of complication were retrospectively analyzed. Tissue adequate for histological diagnosis was obtained in nine (82%) of 11 patients, and no complications other than mild, localized discomfort occurred. Multifocal splenic lesions without splenomegaly in five patients were confirmed as Hodgkin's disease (n=2), tuberculosis (n=1), infarction (n=1), and hemangioma (n=1). All single lesion in four patients were proven as benign conditions including hamartoma (n=2), lymphangioma (n=1) and chronic organizing abscess (n=1), and only of them with a large hamartoma received splenectomy while others did not receive further treatment. Although in two (18%) patients with multiple lesions and splenomegaly, no specific diagnosis was established by US-guided biopsy, malignant lymphoma and Hodgkin's disease were confirmed by surgery. US-guided automated needle biopsy is a safe and valuable procedure that can provides a specific diagnosis in patients with splenic lesions.

  16. Ultrasound-guided versus computed tomography-scan guided biopsy of pleural-based lung lesions.

    Science.gov (United States)

    Khosla, Rahul; McLean, Anna W; Smith, Jessica A

    2016-01-01

    Computed tomography (CT) guided biopsies have long been the standard technique to obtain tissue from the thoracic cavity and is traditionally performed by interventional radiologists. Ultrasound (US) guided biopsy of pleural-based lesions, performed by pulmonologists is gaining popularity and has the advantage of multi-planar imaging, real-time technique, and the absence of radiation exposure to patients. In this study, we aim to determine the diagnostic accuracy, the time to diagnosis after the initial consult placement, and the complications rates between the two different modalities. A retrospective study of electronic medical records was done of patients who underwent CT-guided biopsies and US-guided biopsies for pleural-based lesions between 2005 and 2014 and the data collected were analyzed for comparing the two groups. A total of 158 patients underwent 162 procedures during the study period. 86 patients underwent 89 procedures in the US group, and 72 patients underwent 73 procedures in the CT group. The overall yield in the US group was 82/89 (92.1%) versus 67/73 (91.8%) in the CT group (P = 1.0). Average days to the procedure was 7.2 versus 17.5 (P = 0.00001) in the US and CT group, respectively. Complication rate was higher in CT group 17/73 (23.3%) versus 1/89 (1.1%) in the US group (P guided biopsy is similar to that of CT-guided biopsy, with a lower complication rate and a significantly reduced time to the procedure.

  17. Discussion on compact mechanism of air-stream and synchro-formed clamp plate impact molding

    Directory of Open Access Journals (Sweden)

    Zhenling WANG

    2004-11-01

    Full Text Available Applying the air impact molding method to mold the complicated pattern with wider opening surface and deeper concave, there always exist vaulted phenomenon and lower compactibility of sand mold over the entrance and the concave regions. Using the air-stream and synchro-formed clamp plate impact molding, however, this problem will be preferably solved. In this paper, the compact mechanism of the new molding method and the effect of some configuration factors, such as the area flowed by compressed air and the highness of the protruding block displacement around the diffluent clamp plate, on the compactibility of sand mold were discussed.

  18. Focal Urethral Stricturing Following Intraurethral Mitomycin-C Gel and the Use of a Penile Clamp

    Directory of Open Access Journals (Sweden)

    Richard F. J. Stanford

    2012-01-01

    Full Text Available We present a case of a 51-year-old gentleman, previously diagnosed with high-grade superficial transitional cell carcinoma of the bladder and treated with intravesical mitomycin C and BCG, who developed serial recurrences in the prostatic urethra. This was resected and treated further with intraurethral mitomycin-C gel. He subsequently developed an almost impassable distal penile urethral stricture, corresponding to the site of penile clamp application which we hypothesise is secondary to a combination of the mitomycin-C gel and penile clamp pressure.

  19. Requirements to gap widths and clamping for CO2 laser butt welding

    DEFF Research Database (Denmark)

    Gong, Hui; Juhl, Thomas Winther

    1999-01-01

    In the experimental study of fixturing and gap width requirements a clamping device for laser butt welding of steel sheets has been developed and tested. It has fulfilled the work and made the gap width experiments possible.It has shown that the maximum allowable gap width to some extent is inver......In the experimental study of fixturing and gap width requirements a clamping device for laser butt welding of steel sheets has been developed and tested. It has fulfilled the work and made the gap width experiments possible.It has shown that the maximum allowable gap width to some extent...

  20. Soft-Switched Neutral-Point-Clamped Single-Phase Boost Rectifier

    Science.gov (United States)

    Itoh, Ryozo; Ishizaka, Kouichi

    A soft-switched neutral-point-clamped single-phase boost rectifier capable of compensating the imbalance load voltage is studied. This is based on a single-phase rectifier, in which an inductor is placed in series with the AC supply to resonate with a capacitor connected across the DC output of a full-bridge rectifier and the switching transition is mainly governed by a series resonance. The experimental prototype using insulated-gate bipolar transistors is implemented to investigate the operation under the charge control. The experimental results confirm that the rectifier has a neutral-point-clamp feature providing a good quality AC current.

  1. Yield stress fluids slowly yield to analysis

    NARCIS (Netherlands)

    Bonn, D.; Denn, M.M.

    2009-01-01

    We are surrounded in everyday life by yield stress fluids: materials that behave as solids under small stresses but flow like liquids beyond a critical stress. For example, paint must flow under the brush, but remain fixed in a vertical film despite the force of gravity. Food products (such as

  2. Accuracy of percutaneous lung biopsy for invasive pulmonary aspergillosis

    International Nuclear Information System (INIS)

    Hoffer, F.A.; Gow, K.; Davidoff, A.; Flynn, P.M.

    2001-01-01

    Background. Invasive pulmonary aspergillosis is fulminant and often fatal in immunosuppressed patients. Percutaneous biopsy may select patients who could benefit from surgical resection. Objective. We sought to determine the accuracy of percutaneous biopsy for pediatric invasive pulmonary aspergillosis. Materials and methods. We retrospectively reviewed 28 imaging-guided percutaneous biopsies of the lungs of 24 children with suspected pulmonary aspergillosis. Twenty-two were being treated for malignancy and two for congenital immunodeficiency; 15 had received bone-marrow transplants. The accuracy of the percutaneous lung biopsy was determined by subsequent surgical resection, autopsy, or clinical course. Results. Histopathological studies showed ten biopsy specimens with septate hyphae, indicating a mold, and seven with Aspergillus flavus colonies in culture. The remaining 18 biopsies revealed no fungi. No patient had progressive aspergillosis after negative biopsy. Invasive pulmonary mold was detected by percutaneous biopsy with 100 % (10/10) sensitivity and 100 % (18/18) specificity. Percutaneous biopsy results influenced the surgical decision in 86 % (24 of 28) of the cases. Bleeding complicated the biopsy in 46 % (13/28) and hastened one death. Conclusion. Percutaneous biopsy of the lung is an accurate technique for the diagnosis of invasive pulmonary aspergillosis and correctly determines which immunosuppressed pediatric patients would benefit from therapeutic pulmonary resection. (orig.)

  3. Diagnosis of prostate cancer with needle biopsy: should all cases be biopsied before treatment?

    Science.gov (United States)

    Oranusi, C K; Ugezu, A I; Nwofor, Ame

    2012-01-01

    The triad of digital rectal examination (DRE), serum prostate specific antigen, and transrectal ultrasound-guided prostate biopsy is used in the detection of prostate cancer (PCa). It is recommended that all cases of PCa should be diagnosed with needle biopsy before treatment. The exclusion criteria for those that may not be suitable have not yet been defined. We reviewed all the patients diagnosed with PCa at the Nnamdi Azikiwe University Teaching Hospital Nnewi, Southeast, Nigeria, from January 2007 to December 2010. Relevant biodata and method of diagnosis of PCa before treatment were reviewed. A total of 133 patients had bilateral orchidectomy over the period. 120 (90.2%) had their diagnosis confirmed by needle biopsy before bilateral orchidectomy (category 1), while 13 (9.8%) had bilateral orchidectomy before diagnosis was confirmed. The method of diagnosis for category 1 patients was with lower urinary tract symptoms (LUTS), abnormal DRE findings, elevated prostate-specific antigen (PSA), and transrectal needle biopsy. For category 11 patients, diagnosis of PCa was suspected based on LUTS, abnormal DRE findings, and elevated PSA. Of this number, 11 (84.6%) had, in addition, sudden onset paraplegia at presentation, while 2 (15.4%) had severe uncontrolled hematuria at presentation. All the patients in both categories had needle biopsy confirmation of their disease. The sensitivity of PSA was 99.2%. Needle biopsy of the prostate is the preferred method for the diagnosis of PCa in most cases before treatment is undertaken. There are valid reasons why all PCas will not be diagnosed in this fashion. Elevated PSA when combined with an abnormal DRE finding increases the predictive value for cancer. In areas where pathologists are lacking, abnormal DRE and elevated PSA results can be a guide to proceed to treatment especially, where there is severe compromise of patients' quality of life due to symptoms of advanced PCa while awaiting confirmation.

  4. Initial experience with a novel EUS-guided core biopsy needle (SharkCore): results of a large North American multicenter study

    Science.gov (United States)

    DiMaio, Christopher J.; Kolb, Jennifer M.; Benias, Petros C.; Shah, Hiral; Shah, Shashin; Haluszka, Oleh; Maranki, Jennifer; Sharzehi, Kaveh; Lam, Eric; Gordon, Stuart R.; Hyder, Sarah M.; Kaimakliotis, Pavlos Z.; Allaparthi, Satya B.; Gress, Frank G.; Sethi, Amrita; Shah, Ashish R.; Nieto, Jose; Kaul, Vivek; Kothari, Shivangi; Kothari, Truptesh H.; Ho, Sammy; Izzy, Manhal J.; Sharma, Neil R.; Watson, Rabindra R.; Muthusamy, V. Raman; Pleskow, Douglas K.; Berzin, Tyler M.; Sawhney, Mandeep; Aljahdi, Emad; Ryou, Marvin; Wong, Clarence K.; Gupta, Parantap; Yang, Dennis; Gonzalez, Susana; Adler, Douglas G.

    2016-01-01

    Background and aims: The ability to safely and effectively obtain sufficient tissue for pathologic evaluation by using endoscopic ultrasound (EUS) guidance remains a challenge. Novel designs in EUS needles may provide for improved ability to obtain such core biopsies. The aim of this study was to evaluate the diagnostic yield of core biopsy specimens obtained using a novel EUS needle specifically designed to obtain core biopsies. Patients and methods: Multicenter retrospective review of all EUS-guided fine-needle biopsies obtained using a novel biopsy needle (SharkCore FNB needle, Medtronic, Dublin, Ireland). Data regarding patient demographics, lesion type/location, technical parameters, and diagnostic yield was obtained. Results: A total of 250 lesions were biopsied in 226 patients (Median age 66 years; 113 (50 %) male). Median size of all lesions (mm): 26 (2 – 150). Overall, a cytologic diagnosis was rendered in 81 % specimens with a median number of 3 passes. When rapid onsite cytologic evaluation (ROSE) was used, cytologic diagnostic yield was 126/149 (85 %) with a median number of 3 passes; without ROSE, cytologic diagnostic yield was 31/45 (69 %, P = 0.03) with a median number of 3 passes. Overall, a pathologic diagnosis was rendered in 130/147 (88 %) specimens with a median number of 2 passes. Pathologic diagnostic yield for specific lesion types: pancreas 70/81 (86 %), subepithelial lesion 13/15 (87 %), lymph node 26/28 (93 %). Ten patients (10/226, 4 %) experienced adverse events: 4 acute pancreatitis, 5 pain, 1 fever/cholangitis. Conclusions: Initial experience with a novel EUS core biopsy needle demonstrates excellent pathologic diagnostic yield with a minimum number of passes. PMID:27652304

  5. The biopsy of the boar testes using ultrasonographic examination

    Directory of Open Access Journals (Sweden)

    Laima Liepa

    2014-03-01

    Full Text Available The biopsy of live animal testes is an important clinical manipulation to control spermatogenesis and reproductive system pathologies. The aim was to develop a method of boar testes biopsy using a biopsy gun with ultrasound guidance and to investigate the influence of this procedure on the boar testes parenchyma and quality of ejaculate. The biopsy was carried out in six 8-month-old boars. Fourteen days prior to and 21 days after biopsy, the quality of ejaculate was examined (weight of ejaculate; concentration and motility of spermatozoa with a seven-day intervals. Ultrasound images of the testes parenchyma were recorded three times: directly before and 15 minutes after the biopsy, then 21 days after the procedure. The testes biopsies of generally anesthetized boars were performed with the biopsy gun for needle biopsy with a 12cm long, disposable 16-gauge needle 1.8mm in diameter (Vitesse through 1cm skin incision in the depth of 1.2-1.6cm of parenchyma. Fifteen minutes after the biopsy, macroscopic injures of the parenchyma of all the boar testes were not detected in the ultrasound image. Twenty one days after biopsy, the hyperechogenic line 0.1-0.2cm in diameter was seen in the testes parenchyma of six boars in the depth of 1.2-1.6cm. The biopsy of boar testes did not influence the quality of boars ejaculate. The ultrasonographic examination of boar testicles before the biopsy reduced possibilities to traumatize large blood vessels of the testes. A perfect boar testicular biopsy was easy to perform using ultrasonographic examination in the pigsty conditions.

  6. Bond yield curve construction

    Directory of Open Access Journals (Sweden)

    Kožul Nataša

    2014-01-01

    Full Text Available In the broadest sense, yield curve indicates the market's view of the evolution of interest rates over time. However, given that cost of borrowing it closely linked to creditworthiness (ability to repay, different yield curves will apply to different currencies, market sectors, or even individual issuers. As government borrowing is indicative of interest rate levels available to other market players in a particular country, and considering that bond issuance still remains the dominant form of sovereign debt, this paper describes yield curve construction using bonds. The relationship between zero-coupon yield, par yield and yield to maturity is given and their usage in determining curve discount factors is described. Their usage in deriving forward rates and pricing related derivative instruments is also discussed.

  7. Pleural effusion: Role of pleural fluid cytology, adenosine deaminase level, and pleural biopsy in diagnosis

    Directory of Open Access Journals (Sweden)

    Biswajit Biswas

    2016-01-01

    Full Text Available Objective: The present study is designed to evaluate the role of pleural fluid analysis in diagnosing pleural diseases and to study the advantages and disadvantages of thoracocentasis and pleural biopsy. Materials and Methods: We prospectively included 66 consecutive indoor patients over a duration of 1 year. Pleural fluid was collected and cytological smears were made from the fluid. Plural biopsy was done in the same patient by Cope needle. Adequate pleural biopsy tissue yielding specific diagnosis was obtained in 47 (71.2% cases. Results: Tuberculosis was the commonest nonneoplastic lesion followed by chronic nonspecific pleuritis comprising 60% and 33.3% of the nonneoplastic cases respectively and tuberculosis was predominantly diagnosed in the younger age group. Majority (70.8% of malignancy cases were in the age group of >50-70. Adenocarcinoma was found to be the commonest (66.7% malignant neoplasm in the pleurae followed by small-cell carcinoma (20.8%. Conclusion: Pleural biopsy is a useful and minimally invasive procedure. It is more sensitive and specific than pleural fluid smears.

  8. Image-guided core-needle biopsy of peripheral lymph nodes allows the diagnosis of lymphomas

    International Nuclear Information System (INIS)

    Kerviler, Eric de; Bazelaire, Cedric de; Mathieu, Olivier; Frija, Jacques; Mounier, Nicolas; Gisselbrecht, Christian; Brethon, Benoit; Briere, Josette; Marolleau, Jean-Pierre; Brice, Pauline

    2007-01-01

    It is commonly admitted that the diagnosis of lymphomas can be assessed by the image-guided needle biopsy (IGNB) of deep lymph nodes. However, when peripheral lymph nodes are present, surgical dissection remains the standard strategy. The aim of this study was to evaluate the diagnostic yield of IGNB of peripheral lymph nodes in patients with suspected lymphomas. The records of 180 multisampling IGNBs of peripheral lymph nodes in 180 patients were reviewed. One hundred and twenty-three IGNBs were observed at first diagnosis and 57 at progression using large-cutting core-biopsy needles ranging between 18 G and 14 G in size. Immunohistochemistry studies were performed in all cases and at least one biopsy was systematically frozen. A diagnosis of lymphoma with sufficient information such that a therapeutic decision could be made was obtained in 146 of the 152 patients with lymphoproliferative disorders (96%). IGNB was equally effective in making the correct diagnosis of lymphoma at the time of original diagnosis than at relapse. The results did not depend on the biopsy site, lymph nodes size, or needle type. We recommend that IGNB may be performed as an initial procedure for the diagnosis of lymphomas either in the presence of peripheral or deep lymph nodes, as it avoids surgery. (orig.)

  9. Characterization of the torque limits and clamping force relationships for small stainless steel screws in tensile loaded joints of various metals

    Energy Technology Data Exchange (ETDEWEB)

    Bernardin, John D [Los Alamos National Laboratory; Flores, Eugene M [Los Alamos National Laboratory

    2009-01-01

    This study originated during the design of ChemCam, a Laser Induced Breakdown Spectroscopy (LIBS) and imaging instrument being developed for NASA's Mars Science Lab Rover. The mission needs for miniaturization, reduced weight, high reliability, minimal use of thread locking compounds, and the ability to handle harsh environmental conditions dictated the use of small, high strength screws to be threaded into a variety of metal alloys including Be-S200f, Al-6061-T6, Mg-ZK60A-T5, and Ti-6Al-4V The lack of a credible fastener torque database for small (No.0 through No.8) high strength stainless steel screws in various parent materials, led to the development of an experimental program to characterize the following: (A) The screw torque value versus angular rotation (which indicates yielding in the screw or parent material) as a function of screw diameter, screw head configuration, depth of thread engagement, type of parent material, type of surface treatment on parent material, presence of thread locking compound, repeatable threaded hole use, and degree of screw pedigree. (B) The relationship between fastener torque and clamping force for a subset of the above mentioned variables. The database generated from this study will serve as a design reference for utilizing small stainless steel fasteners and provide trending information for other researchers who may be interested in broadening its range of parameters. This paper reviews the related fastener torque and clamping force information from the literature, describes the experimental screw torque and clamping force monitoring equipment, presents the test matrix and experimental procedures, and discusses the empirical results.

  10. The interpretation of glucose clamp studies of long-acting insulin analogues: from physiology to marketing and back

    NARCIS (Netherlands)

    Swinnen, S. G. H. A.; Holleman, F.; DeVries, J. H.

    2008-01-01

    Glucose clamp studies assessing the time-action profile of long-acting insulin analogues have reported conflicting results. In an attempt to reconcile the data, we organised an expert meeting of four leading European clamp groups, during which consensus was reached on some but not all points

  11. Research on micromanipulator’s clamping force sensing based on static wirerope tension of a surgical robot

    Directory of Open Access Journals (Sweden)

    Lingtao Yu

    2015-04-01

    Full Text Available The micromanipulator’s force feedback is one of the key research contents of minimally invasive surgical robotic system. Because the micromanipulator is a kind of compact construction which is suitable for valve installation with small space in surgery, especially for the influence of disinfection method, there are major difficulties and limitations to integrate compact sensors in the end of micromanipulator. This article focuses on the 3-degree-of-freedom micromanipulator’s clamping force sensing, and these three joints are actuated by wirerope driving. A clamping force sensing method is proposed based on static tension of wirerope driving, and a static model between the clamping force and wirerope’s static tension is established considering the influence of real friction resistance in the mechanical system. Finally, an equivalent experimental test platform for 3-degree-of-freedom micromanipulator’s clamping force sensing is set up, and then a series of experiments of the clamping force are studied. The frictional resistances of wirerope between the guide plate and guide pulley mechanism are tested, and a calibration and correction method of the experimental clamping force is proposed. The final experiment results show that the total average accuracy of experimental clamping force is about 78.3%, and it can be the basic measurement force to realize micromanipulator’s clamping force feedback of a minimally invasive surgical robot.

  12. Evaluation of diel patterns of relative changes in cell turgor of tomato plants using leaf patch clamp pressure probes

    NARCIS (Netherlands)

    Lee, K.M.; Driever, S.M.; Heuvelink, E.; Rüger, S.; Zimmermann, U.; Gelder, de A.; Marcelis, L.F.M.

    2012-01-01

    Relative changes in cell turgor of leaves of well-watered tomato plants were evaluated using the leaf patch clamp pressure probe (LPCP) under dynamic greenhouse climate conditions. Leaf patch clamp pressure changes, a measure for relative changes in cell turgor, were monitored at three different

  13. MATLAB implementation of a dynamic clamp with bandwidth >125 KHz capable of generating INa at 37°C

    Science.gov (United States)

    Clausen, Chris; Valiunas, Virginijus; Brink, Peter R.; Cohen, Ira S.

    2012-01-01

    We describe the construction of a dynamic clamp with bandwidth >125 KHz that utilizes a high performance, yet low cost, standard home/office PC interfaced with a high-speed (16 bit) data acquisition module. High bandwidth is achieved by exploiting recently available software advances (code-generation technology, optimized real-time kernel). Dynamic-clamp programs are constructed using Simulink, a visual programming language. Blocks for computation of membrane currents are written in the high-level matlab language; no programming in C is required. The instrument can be used in single- or dual-cell configurations, with the capability to modify programs while experiments are in progress. We describe an algorithm for computing the fast transient Na+ current (INa) in real time, and test its accuracy and stability using rate constants appropriate for 37°C. We then construct a program capable of supplying three currents to a cell preparation: INa, the hyperpolarizing-activated inward pacemaker current (If), and an inward-rectifier K+ current (IK1). The program corrects for the IR drop due to electrode current flow, and also records all voltages and currents. We tested this program on dual patch-clamped HEK293 cells where the dynamic clamp controls a current-clamp amplifier and a voltage-clamp amplifier controls membrane potential, and current-clamped HEK293 cells where the dynamic clamp produces spontaneous pacing behavior exhibiting Na+ spikes in otherwise passive cells. PMID:23224681

  14. Computational Model of Rabbit SA Node Pacemaker Activity Probed with Action Potential and Calcium Transient Clamp

    NARCIS (Netherlands)

    van Borren, Marcel M. J.; Zegers, Jan G.; Verkerk, Arie O.; Wilders, Ronald

    2007-01-01

    In the past decades, various computational models of the pacemaker activity of single sinoatrial (SA) nodal cells have been developed, building on data obtained in patch-clamp experiments on isolated SA nodal myocytes. These models show widely different results regarding the contribution of

  15. Emergent management of APC-2 pelvic ring injuries with an anteriorly placed C-clamp.

    Science.gov (United States)

    Richard, Marc J; Tornetta, Paul

    2009-01-01

    Can anteriorly placed pelvic C-clamps be used successfully in the emergent management of APC-2 pelvic fractures? Prospective cohort. Level 1 trauma center. A single-surgeon series of 24 patients with an anteroposterior compression type 2 pelvic fracture. Application of an anteriorly placed pelvic C-clamp within 2 hours of presentation. Response to hypotension, complications related to pin placement, application time, and symphyseal reduction measured on anteroposterior radiograph. Twenty-four patients with a mean age of 29 years (14-58 years) had an APC-2 pelvic fracture diagnosed by an anteroposterior radiograph of the pelvis on presentation. All patients were emergently managed with an anteriorly placed C-clamp applied in the emergency room (10), angiography suite (9), or operating room (5). Eleven patients presented with hypotension (systolic blood pressure elevation of their blood pressure of 23 mm Hg (10-44 mm Hg). The symphyseal separation was reduced from a mean of 4.5 cm (3-9 cm) to pelvic C-clamp can be placed anteriorly as a part of the early management of APC-2 pelvic fractures with a short application time in a variety of patient care areas.

  16. Gain-clamping techniques in two-stage double-pass L-band EDFA

    Indian Academy of Sciences (India)

    Two designs of long-wavelength band erbium-doped fiber amplifier (L-band EDFA) for gain clamping in double-pass systems are demonstrated and compared. The first design is based on ring laser technique where a backward amplified spontaneous emission (ASE) from the second stage is routed into the feedback loop ...

  17. Simple hardware implementation of voltage balancing in capacitor-clamped inverter

    Czech Academy of Sciences Publication Activity Database

    Kokeš, Petr; Semerád, Radko

    2009-01-01

    Roč. 54, č. 4 (2009), s. 325-341 ISSN 0001-7043 R&D Projects: GA MPO FT-TA4/077 Institutional research plan: CEZ:AV0Z20570509 Keywords : capacitor-clamped multilevel inverter * flying capacitor voltage balancing * pulse width modulation (PWM) Subject RIV: JA - Electronics ; Optoelectronics, Electrical Engineering

  18. Trans-Z-source and Γ-Z-source neutral-point-clamped inverters

    DEFF Research Database (Denmark)

    Wei, Mo; Loh, Poh Chiang; Blaabjerg, Frede

    2015-01-01

    Z-source neutral-point-clamped (NPC) inverters are earlier proposed for obtaining voltage buck-boost and three-level switching simultaneously. Their performances are, however, constrained by a trade-off between their input-to-output gain and modulation ratio. This trade-off can lead to high...

  19. CLAMP - a toolkit for efficiently building customized clinical natural language processing pipelines.

    Science.gov (United States)

    Soysal, Ergin; Wang, Jingqi; Jiang, Min; Wu, Yonghui; Pakhomov, Serguei; Liu, Hongfang; Xu, Hua

    2017-11-24

    Existing general clinical natural language processing (NLP) systems such as MetaMap and Clinical Text Analysis and Knowledge Extraction System have been successfully applied to information extraction from clinical text. However, end users often have to customize existing systems for their individual tasks, which can require substantial NLP skills. Here we present CLAMP (Clinical Language Annotation, Modeling, and Processing), a newly developed clinical NLP toolkit that provides not only state-of-the-art NLP components, but also a user-friendly graphic user interface that can help users quickly build customized NLP pipelines for their individual applications. Our evaluation shows that the CLAMP default pipeline achieved good performance on named entity recognition and concept encoding. We also demonstrate the efficiency of the CLAMP graphic user interface in building customized, high-performance NLP pipelines with 2 use cases, extracting smoking status and lab test values. CLAMP is publicly available for research use, and we believe it is a unique asset for the clinical NLP community. © The Author 2017. Published by Oxford University Press on behalf of the American Medical Informatics Association. All rights reserved. For Permissions, please email: journals.permissions@oup.com.

  20. Significance of Shrinkage Induced Clamping Pressure in Fiber-Matrix Bonding in Cementitious Composite Materials

    DEFF Research Database (Denmark)

    Stang, Henrik

    1996-01-01

    used in high performance cementitious composite materials.Assuming a Coulomb type of friction on the fiber/matrix interface andusing typical values for the frictional coefficient it is shownthat the shrinkage induced clamping pressure could be one of the mostimportant factors determining the frictional...

  1. Characterization of a patch-clamp microchannel array towards neuronal networks analysis

    DEFF Research Database (Denmark)

    Alberti, Massimo; Snakenborg, Detlef; Lopacinska, Joanna M.

    2010-01-01

    for simultaneous patch clamping of cultured cells or neurons in the same network. A disposable silicon/silicon dioxide (Si/SiO2) chip with a microhole array was integrated in a microfluidic system for cell handling, perfusion and electrical recording. Fluidic characterization showed that our PC mu CA can work...

  2. Reduced middle cerebral artery velocity during cross-clamp predicts cognitive dysfunction after carotid endarterectomy.

    Science.gov (United States)

    Mergeche, Joanna L; Bruce, Samuel S; Sander Connolly, E; Heyer, Eric J

    2014-03-01

    Transcranial Doppler (TCD) is a useful monitor that can be utilized during carotid endarterectomy (CEA). Cognitive dysfunction is a subtler and more common form of neurologic injury than stroke. We aimed to determine whether reduced middle cerebral artery (MCA) mean velocity (MV) predicts cognitive dysfunction and if so, whether a threshold of increased risk of cognitive dysfunction can be identified. One hundred twenty-four CEA patients were included in this observational study and neuropsychometrically evaluated preoperatively and 24 hours postoperatively. MCA-MV was measured by TCD and percentage of baseline during cross-clamp was calculated (MV(cross-clamp)/MV(baseline)). Patients with cognitive dysfunction had significantly lower MV during cross-clamp than those without cognitive dysfunction (33.1 ± 13.7 cm/s versus 39.6 ± 16.0 cm/s, p=0.02). In the final multivariate model, each percent reduction in MV was significantly associated with greater risk of cognitive dysfunction (odds ratio [OR]: 0.05 [95% confidence interval {CI} 0.01-0.23], p Reduced MCA-MV during cross-clamp is a predictor of cognitive dysfunction exhibited 24 hours after CEA. MCA-MV reduced to <72% of baseline, or a ≥28% reduction from baseline, is the threshold most strongly associated with increased risk of cognitive dysfunction. These observations should be considered by all clinicians that utilize intraoperative monitoring for CEA. Copyright © 2013 Elsevier Ltd. All rights reserved.

  3. space vector pulse width modulation of a multi-level diode clamped

    African Journals Online (AJOL)

    ES Obe

    Abstract. This paper presents the analysis of a multi-level diode clamped converter (DCC) which is implemented using space-vector pulse width modulation (SVPWM) tech- nique, widely considered as the most efficient and easily applied modulation tech- nique in most industrial drives and control applications.

  4. Influence of fretting on the fatigue strength at the vise clamp ...

    Indian Academy of Sciences (India)

    Unknown

    The electrical resistance strain gauges tech- nique was used for determining the alternating stress ... the photographic view of this machine. The clamping pressure was determined by strain gauges attached directly .... fretting actions, while below the knee the damage is solely due to fretting action. In the case of low-carbon ...

  5. Electrosurgical bipolar vessel sealing versus conventional clamping and suturing for vaginal hysterectomy: a randomised controlled trial

    NARCIS (Netherlands)

    Lakeman, M. M. E.; The, S.; Schellart, R. P.; Dietz, V.; ter Haar, J. F.; Thurkow, A.; Scholten, P. C.; Dijkgraaf, M. G. W.; Roovers, J. P. W. R.

    2012-01-01

    Please cite this paper as: Lakeman M, The S, Schellart R, Dietz V, ter Haar J, Thurkow A, Scholten P, Dijkgraaf M, Roovers J. Electrosurgical bipolar vessel sealing versus conventional clamping and suturing for vaginal hysterectomy: a randomised controlled trial. BJOG 2012;119:14731482. Objective To

  6. Gain-clamping techniques in two-stage double-pass L-band EDFA

    Indian Academy of Sciences (India)

    sion (ASE) from the second stage is routed into the feedback loop to create an oscillating laser for gain clamping. ... able to maintain constant gain during channel add/drop or abrupt failure in the system. To satisfy the ... of the input power of signals and the number of channels used in DWDM systems. To date, various ...

  7. A cryogenic clamping technique that facilitates ultimate tensile strength determinations in tendons and ligaments.

    Science.gov (United States)

    Bowser, J E; Elder, S H; Rashmir-Raven, A M; Swiderski, C E

    2011-01-01

    To describe the use of a cryogenic clamp of novel design for tensile strength testing of tendinous and ligamentous tissues with inherently high tensile strength. Inexpensive, easily machined steel clamps were manufactured to facilitate rapid insertion into a standard wedge-screw grip apparatus installed on a testing system with a control system attached. The deep digital flexor tendon (DDFT) of six horses was trimmed to a uniform dumbbell shape and secured in clamps using partial submersion in liquid nitrogen for approximately 45 seconds and immediately tested. Approximate time between removal from liquid nitrogen and failure of tendon was four minutes. Failure was achieved in all tendons tested in a region approximating a midpoint between the clamps. Ultimate failure loads of up to 6745 N were achieved without slippage of the tissue from the grips. The ultimate tensile strength of the normal equine DDFT determined in this study was 111.82 ± 11.53 N/mm2, and the stress versus grip-to-grip elongation plots for our equine DDFT were representative of a standard non-linear elastic curve obtained in similar studies. We present a low cost device for quantifying physical properties of specimens with high connective tissue concentrations and inherent high tensile strength. Results of this study indicate that this device provides a practical alternative to other more costly methods of adequately securing larger tendons and ligaments for tensile strength testing.

  8. Intrinsic thermal vibrations of suspended doubly clamped single-wall carbon nanotubes

    OpenAIRE

    Babic, B.; Furer, J.; Sahoo, S.; Farhangfar, Sh.; Schonenberger, C.

    2003-01-01

    We report the observation of thermally driven mechanical vibrations of suspended doubly clamped carbon nanotubes, grown by chemical vapor deposition (CVD). Several experimental procedures are used to suspend carbon nanotubes. The vibration is observed as a blurring in images taken with a scanning electron microscope. The measured vibration amplitudes are compared with a model based on linear continuum mechanics.

  9. E. coli DNA replication in the absence of free beta clamps

    NARCIS (Netherlands)

    Tanner, Nathan A.; Tolun, Goekhan; Loparo, Joseph J.; Jergic, Slobodan; Griffith, Jack D.; Dixon, Nicholas E.; van Oijen, Antoine M.

    2011-01-01

    During DNA replication, repetitive synthesis of discrete Okazaki fragments requires mechanisms that guarantee DNA polymerase, clamp, and primase proteins are present for every cycle. In Escherichia coli, this process proceeds through transfer of the lagging-strand polymerase from the beta sliding

  10. Early vs delayed clamping of the umbilical cord in full term, preterm and very preterm infants

    DEFF Research Database (Denmark)

    Moller, N.K.; Weber, T.

    2008-01-01

    Randomized studies from 2006 and two meta-analyses published in 2007 agree that clamping of the umbilical cord can be delayed. For the preterm and very preterm infant benefits include less need for blood transfusion and less morbidity, especially for the very preterm male infant. For the term...

  11. Fundamentals of a Multi-Phase, Neutral-Point Clamped Multilevel ...

    African Journals Online (AJOL)

    The conventional five-level diode-clamped inverter suffers from the problem of many active power switches when extended to multiphase system. As a consequence, increasing number of gate drive circuits are required; resulting in complex system circuitry. This paper presents the fundamentals of a multiphase, neutral ...

  12. i-Clamp phenoxazine for the fine tuning of DNA i-motif stability

    Science.gov (United States)

    Tsvetkov, Vladimir B; Zatsepin, Timofei S; Belyaev, Evgeny S; Kostyukevich, Yury I; Shpakovski, George V; Podgorsky, Victor V; Pozmogova, Galina E; Varizhuk, Anna M

    2018-01-01

    Abstract Non-canonical DNA structures are widely used for regulation of gene expression, in DNA nanotechnology and for the development of new DNA-based sensors. I-motifs (iMs) are two intercalated parallel duplexes that are held together by hemiprotonated C-C base pairs. Previously, iMs were used as an accurate sensor for intracellular pH measurements. However, iM stability is moderate, which in turn limits its in vivo applications. Here, we report the rational design of a new substituted phenoxazine 2′-deoxynucleotide (i-clamp) for iM stabilization. This residue contains a C8-aminopropyl tether that interacts with the phosphate group within the neighboring chain without compromising base pairing. We studied the influence of i-clamp on pH-dependent stability for intra- and intermolecular iM structures and found the optimal positions for modification. Two i-clamps on opposite strands provide thermal stabilization up to 10–11°C at a pH of 5.8. Thus, we developed a new modification that shows significant iM-stabilizing effect both at strongly and mildly acidic pH and increases iM transition pH values. i-Clamp can be used for tuning iM-based pH probes or assembling extra stable iM structures for various applications. PMID:29474573

  13. Experimental background of pain treatment by heat application - rapid heating and cooling in patch clamp experiments

    Czech Academy of Sciences Publication Activity Database

    Dittert, Ivan; Slovák, P.; Jíra, J.

    2005-01-01

    Roč. 8, Suppl.2 (2005), s. 32-32 ISSN 1212-0634. [Česko-Slovenské dialógy o bolesti /7./. 13.10.2005 - 15.10.2005, Bojnice] Institutional research plan: CEZ:AV0Z50110509 Keywords : patch clamp * channels Subject RIV: CF - Physical ; Theoretical Chemistry

  14. Five-Level Active-Neutral-Point-Clamped DC/DC Converter

    DEFF Research Database (Denmark)

    Liu, Dong; Deng, Fujin; Chen, Zhe

    2016-01-01

    Multi-level converters are getting more and more attentions because of their obvious merits such as lower voltage stress and harmonic, smaller size of output filters, and so on. In this paper, a five-level active-neutral-point-clamped (5L-ANPC) dc/dc converter is proposed for power transfer...

  15. Seasonal growth of the attachment clamps of a Paradiplozoon sp. as ...

    African Journals Online (AJOL)

    Geometric morphometric methods using computer software is a more statistically powerful method of assessing changes in the anatomy than are traditional measurements of lengths. The aim of the study was to investigate whether changes in the size and shape Paradiplozoon sp. permanent attachment clamps could be ...

  16. Single stage buck-boost DC-AC neutral point clamped inverter

    DEFF Research Database (Denmark)

    Mo, Wei; Loh, Poh Chiang; Andrew, A.

    2012-01-01

    This paper proposes a new single stage buck-boost DC-AC neutral point clamped inverter topology which integrates the cascaded configurations of recently introduced inductor-capacitor-capacitor-transformer impedance source network (by Adamowicz) and classic NPC configuration. As a consequence...

  17. A New Preparation of Pancreatic Ducts for Patch-Clamp Studies

    DEFF Research Database (Denmark)

    Novak, Ivana; Hug, M.J.

    1995-01-01

    parameters, monitored with the whole-cell patch-clamp method, and those in isolated perfused ducts, monitored with the conventional microelectrodes [Novak I, Greger R: Pflügers Arch 1988;411:58-68, 546-553], are comparable. Similar conclusion can be made about the calcium measurements [Hug M, et al: Pflügers...

  18. Construction, Calibration, and Validation of a Simple Patch-Clamp Amplifier for Physiology Education

    Science.gov (United States)

    Rouzrokh, Ali; Ebrahimi, Soltan Ahmed; Mahmoudian, Massoud

    2009-01-01

    A modular patch-clamp amplifier was constructed based on the Strickholm design, which was initially published in 1995. Various parts of the amplifier such as the power supply, input circuit, headstage, feedback circuit, output and nulling circuits were redesigned to use recent software advances and fabricated using the common lithographic printed…

  19. Enhanced Buck-Boost Three-Level Neutral-Point-Clamped Inverters

    DEFF Research Database (Denmark)

    Tan, K. K.; Gao, F.; Chiang Loh, Poh

    2009-01-01

    In traditional three-level neutral-point-clamped (NPC) inverters, a major issue is capacitor voltage imbalance, which results in low order harmonics. The compensation of the capacitor voltages often require additional control complexity, which cannot be conveniently implemented. The "alternative...

  20. Model Predictive Control of Z-source Neutral Point Clamped Inverter

    DEFF Research Database (Denmark)

    Mo, Wei; Loh, Poh Chiang; Blaabjerg, Frede

    2011-01-01

    This paper presents Model Predictive Control (MPC) of Z-source Neutral Point Clamped (NPC) inverter. For illustration, current control of Z-source NPC grid-connected inverter is analyzed and simulated. With MPC’s advantage of easily including system constraints, load current, impedance network...

  1. Hand-assisted partial nephrectomy with early arterial clamp removal: Impact of the learning curve

    DEFF Research Database (Denmark)

    Azawi, Nessn H; Norus, Thomas P; Wittendorff, Hans-Erik

    2014-01-01

    (40%), nine (45%) and 14 (70%) patients in cohorts 1, 2 and 3, respectively (p = 0.0185). CONCLUSIONS: Hand-assisted laparoscopic partial nephrectomy with early removal of arterial clamps is safe and easy to learn. An expert laparoscopic surgeon can perform hand-assisted laparoscopic partial...

  2. Pulse-Width-Modulation of Neutral-Point-Clamped Sparse Matrix Converter

    DEFF Research Database (Denmark)

    Loh, P.C.; Blaabjerg, Frede; Gao, F.

    2007-01-01

    literature. Addressing the afore-described issues, this paper focuses on the operational mode analysis of a three-level sparse matrix converter implemented using a neutral-point-clamped inversion stage, and  the design of a number of PWM and modulation ratio compensation schemes for controlling the converter...

  3. Model clamp and its application to synchronization of rabbit sinoatrial node cells

    NARCIS (Netherlands)

    Wilders, R.; Verheijck, E. E.; Kumar, R.; Goolsby, W. N.; van Ginneken, A. C.; Joyner, R. W.; Jongsma, H. J.

    1996-01-01

    A method for coupling an isolated cardiac cell to a simulated cardiac cell, i.e., the real-time solution of a mathematical model of such cell, has been developed. With this "model clamp" technique, the real cell and the model cell are coupled by any desired value of intercellular coupling

  4. Dengue: muscle biopsy findings in 15 patients

    Directory of Open Access Journals (Sweden)

    S.M.F. Malheiros

    1993-06-01

    Full Text Available Dengue is known to produce a syndrome involving muscles, tendons and joints. The hallmark of this syndrome is severe myalgia but includes fever, cutaneous rash, and headache. The neuromuscular aspects of this infection are outlined only in isolated reports, and the muscle histopathological features during myalgia have not been described. In order to ascertain the actual neuromuscular involvement in dengue and better comprehend the histological nature of myalgia, we performed a clinical and neurological evaluation, a serum CPK level and a muscle biopsy (with histochemistry in 15 patients (4 males, median age 23 years (range 14-47 with classic dengue fever, serologically confirmed, during the bra-zilian dengue epidemics from September 1986 to March 1987. All patients had a history of fever, headache and severe myalgia. Upon examination 4 had a cutaneous rash, 3 had fever, and 3 a small hepatomegaly. The neurological examination was unremarkable in all and included a manual muscle test. CPK was mildly elevated in only 3 patients. Muscle biopsy revealed a light to moderate perivascular mononuclear infiltrate in 12 patients and lipid accumulation in 11. Mild mitochondrial proliferation was seen in 3, few central nuclei in 3, rare foci of myonecrosis in 3, and 2 patients had type grouping. Dengue in our patients, produced myalgia but no detectable muscle weakness or other neuromuscular involvement. The main histopathological correlation with myalgia seems to be a perivascular mononuclear infiltrate and lipid accumulation.

  5. Post biopsy pneumothorax: Risk factors and course

    International Nuclear Information System (INIS)

    Sanchez, J.A.; Retamar, J.A.; Blazquez, J.; Castano, J.C.

    1996-01-01

    The was to study the natural course of pneumothorax produced after aspiration biopsy in the attempt to differentiate those cases that will resolve spontaneously from those that will require drainage, and to assess the possible risk factors associated with the development of this entity. Eighty-nine CT-guided aspiration biopsies were performed in 80 patients. Control CT was done immediately after the procedure and 24 hours later. When pneumothorax persisted, CT was repeated at 48 h, 72 h, day 5 and day 7 or until a drainage tube was introduced. The cases of pneumothorax were classified as minimal, anterior or anterolateral. Seven variables were assessed as possible risk factors for its occurrence. Pneumothorax developed on 29 occasions (32.5%), requiring drainage in 12 cases (13.5%). In 20 patients (22%), pneumothorax occurred immediately, while in the remaining 9 (10%) it was detected in the 24 h CT scan. When studied according to type, drainage was required in 3 of the 19 cases of minimal or anterior pneumothorax (15%) and in 9 or the 10 cases of anterolateral location (90%) (p<0.0005). The mean thickness of the parenchyma punctured was 3.4 cm +- 2.2. cm when pneumothorax developed and 1.3 cm+- 2 cm when it did not (p<0.0001). There is a statistically significant association between the development of anterolateral pneumothorax and the need for chest drainage. The thickness of the punctured parenchyma is associated with the production of pneumothorax. 16 refs

  6. Endometrial biopsy findings in postmenopausal bleeding

    International Nuclear Information System (INIS)

    Sarfraz, T.; Tariq, H.

    2007-01-01

    To study endometrial histopathology in women presenting with postmenopausal bleeding. A two-year study from January 2003 to December 2004 of 100 cases of postmenopausal bleeding was conducted at Combined Military Hospital, Sialkot. The histopathology of endometrial biopsy specimens was done to find out the causes of postmenopausal bleeding in these ladies. All these 100 patients had confirmed menopause and the average age was 55 years and above. The most common histopathological diagnosis was senile endometrial atrophy (27%), followed by simple cystic hyperplasia in (17%). Three cases of simple cystic hyperplasia had coexistent ovarian tumors. Glandular hyperplasia without atypia was seen in 6% and with atypia in 4%. Other causes were endometritis (13%), endometrial polyps (8%), proliferative phase endometrium (6%) and secretary phase endometrium (5%). Endometrial carcinoma was seen in (6%) cases, (8%) biopsy specimens were non-representative. Although senile endometrial atrophy was most commonly found in these ladies but a significant percentage of endometrial hyperplasia and endometrial cancer implies the need for investigating all cases of postmenopausal bleeding. Bimanual examination and pelvic ultrasonography should be combined with endometrial sampling so that rare pelvic pathologies may not be missed. (author)

  7. Applications of Dynamic Clamp to Cardiac Arrhythmia Research: Role in Drug Target Discovery and Safety Pharmacology Testing.

    Science.gov (United States)

    Ortega, Francis A; Grandi, Eleonora; Krogh-Madsen, Trine; Christini, David J

    2017-01-01

    Dynamic clamp, a hybrid-computational-experimental technique that has been used to elucidate ionic mechanisms underlying cardiac electrophysiology, is emerging as a promising tool in the discovery of potential anti-arrhythmic targets and in pharmacological safety testing. Through the injection of computationally simulated conductances into isolated cardiomyocytes in a real-time continuous loop, dynamic clamp has greatly expanded the capabilities of patch clamp outside traditional static voltage and current protocols. Recent applications include fine manipulation of injected artificial conductances to identify promising drug targets in the prevention of arrhythmia and the direct testing of model-based hypotheses. Furthermore, dynamic clamp has been used to enhance existing experimental models by addressing their intrinsic limitations, which increased predictive power in identifying pro-arrhythmic pharmacological compounds. Here, we review the recent advances of the dynamic clamp technique in cardiac electrophysiology with a focus on its future role in the development of safety testing and discovery of anti-arrhythmic drugs.

  8. [Stereotactic vacuum-assisted breast biopsy (Mammotome biopsy) for non-palpable microcalcification on mammography].

    Science.gov (United States)

    Matsuzaki, Saeko; Shiba, Eiichi; Kobayashi, Yasushi; Kawai, Mieko; Kitamura, Kaeko; Nishita, Toshiyuki; Nishio, Hiroshi; Kobayashi, Nobuyuki

    2005-01-01

    The purpose of this study was to assess the benefits of stereotactic vacuum-assisted breast biopsy in patients with non-palpable microcalcification detected on mammography. Between October 2001 and November 2003, stereotactic Mammotome biopsies were performed for 150 microcalcified lesions on mammography using the prone-type stereotactic vacuum-assisted breast biopsy system (Mammotest and Mammovision, Fischer, Denver, USA) . The mammography findings were classified according to the guidelines of The Japan Radiological Society/The Japan Association of Radiological Technologists. Ninety-eight cases were category 3, 38 were category 4, and 14 were category 5. All cases were determined to be cases of microcalcification by specimen radiography or histology. Complications were negligible. One hundred twenty of the cases were mastopathy, and 30 of them were breast cancer (14 were ductal carcinoma in situ, 7 were ductal carcinoma in situ with microinvasion, and 9 were invasive ductal carcinoma). Twenty-seven breast cancers were diagnosed as category 4 or 5 (51.9%) on mammography. The operative stages of 27 cases were as follows: 7 were stage 0, 17 were stage 1, and 3 were stage 2A. Twenty-four of 27 (88.9%) were early breast cancers. Mammotome biopsy is a safe and useful modality for the histological diagnosis of non-palpable microcalcifications.

  9. Systematic extended and saturation prostate biopsy: when and how.

    Science.gov (United States)

    Scattoni, V; Maccagnano, C; Zanni, G; Angiolilli, D; Raber, M; Rigatti, P; Montorsi, F

    2010-06-01

    The increasing incidence of prostate cancer is manly due to the improvement of systematic transrectal ultrasound-guided prostate biopsy techniques. The objective of this review is to analyze the different approaches and the most common schemes used to perform prostate biopsy, the role of the anesthetic procedures, of the complementary imaging methods and the histological evaluation of the biopsy results. The actual indications to perform prostate biopsy have been also critically reviewed. We performed a review of the literature by searching Medline Database with the following key words: prostate cancer, diagnosis, trans-rectal ultrasound (TRUS), prostate biopsy, anaesthesia and prognosis. Prostate biopsy is always performed under transrectal ultrasound guidance with both transrectal and transperineal approach, with a minimal core number of 10. The extended protocols include lateral peripheral zone cores and cores from lesions found on palpation or imaging. Saturation biopsies should be performed only in case of repeat biopsies. The refinement of effective local anesthesia has allowed to increase the number of biopsies without important side effects. Complementary imaging methods might be adopted in order to reduce the number of unnecessary procedures .The histological issues related to the number and the location of cores are still matter of debate as important prognostic factors. According to international guidelines, the factors most involved in performing prostate biopsy still include suspicious digital rectal examination and PSA. Both the transrectal and the transperineal approach in prostatic biopsy are valid in term of detection rate and low incidence of side effects. The initial biopsy scheme in mainly extended, saturation biopsy has to be considered only in the repeat setting, with the eventual help of the complementary imaging methods. The histological issues has to be considered about patient's prognosis.

  10. Scanning electron microscope/energy dispersive x ray analysis of impact residues on LDEF tray clamps

    Science.gov (United States)

    Bernhard, Ronald P.; Durin, Christian; Zolensky, Michael E.

    1992-01-01

    To better understand the nature of particulates in low-Earth orbit (LEO), and their effects on spacecraft hardware, we are analyzing residues found in impacts on the Long Duration Exposure Facility (LDEF) tray clamps. LDEF experiment trays were held in place by 6 to 8 chromic-anodized aluminum (6061-T6) clamps that were fastened to the spacecraft frame using three stainless steel hex bolts. Each clamp exposed an area of approximately 58 sq cm (4.8 cm x 12.7 cm x .45 cm, minus the bolt coverage). Some 337 out of 774 LDEF tray clamps were archived at JSC and are available through the Meteoroid & Debris Special Investigation Group (M&D SIG). Optical scanning of clamps, starting with Bay/Row A01 and working toward H25, is being conducted at JSC to locate and document impacts as small as 40 microns. These impacts are then inspected by Scanning Electron Microscopy/Energy Dispersive X-ray Analysis (SEM/EDXA) to select those features which contain appreciable impact residue material. Based upon the composition of projectile remnants, and using criteria developed at JSC, we have made a preliminary discrimination between micrometeoroid and space debris residue-containing impact features. Presently, 13 impacts containing significant amounts of unmelted and semi-melted micrometeoritic residues were forwarded to Centre National d'Etudes Spatiales (CNES) in France. At the CNES facilities, the upgraded impacts were analyzed using a JEOL T330A SEM equipped with a NORAN Instruments, Voyager X-ray Analyzer. All residues were quantitatively characterized by composition (including oxygen and carbon) to help understand interplanetary dust as possibly being derived from comets and asteroids.

  11. Effects of a cantaloupe melon extract/wheat gliadin biopolymer during aortic cross-clamping.

    Science.gov (United States)

    Kick, Jochen; Hauser, Balázs; Bracht, Hendrik; Albicini, Maura; Oter, Sükrü; Simon, Florian; Ehrmann, Ulrich; Garrel, Catherine; Sträter, Jörn; Brückner, Uwe B; Leverve, Xavier M; Schelzig, Hubert; Speit, Günter; Radermacher, Peter; Muth, Claus-Martin

    2007-04-01

    We previously reported in healthy volunteers that a cantaloupe melon extract chemically combined with wheat gliadin (melon extract/gliadin) and containing SOD, catalase and residual glutathione peroxidase (GPx), protected against DNA strand-break damage induced by hyperbaric oxygen (HBO), a well-established model of DNA damage resulting from oxidative stress. Aortic cross-clamping is a typical example of ischemia/reperfusion injury-related oxidative stress, and therefore we investigated whether this melon extract/gliadin would also reduce DNA damage after aortic cross-clamping and reperfusion. Prospective, randomized, controlled experimental study. Animal laboratory. 18 anesthetized, mechanically ventilated and instrumented pigs. After 14 days of oral administration of 1250 mg of the melon extract/gliadin (n=9) or vehicle (n=9), animals underwent 30 min of thoracic aortic cross-clamping and 4 h of reperfusion. Before clamping, immediately before declamping, and at 2 and 4 h of reperfusion, we measured blood isoprostane (immunoassay) and malondialdehyde concentrations (fluorimetric thiobarbituric acid test), SOD, catalase and GPx activities (spectrophotometric kits), NO formation (nitrate+nitrite; chemoluminescence), DNA damage in whole blood samples and isolated lymphocytes exposed to hyperbaric oxygen (comet assay). Organ function was also evaluated. Kidney and spinal cord specimen were analysed for apoptosis (TUNEL assay). The melon extract/gliadin blunted the DNA damage, reduced spinal cord apoptosis and attenuated NO release, however, without any effect on lipid peroxidation and organ function. Pre-treatment with the oral melon extract/gliadin may be a therapeutic option to reduce oxidative cell injury affiliated with aortic cross-clamping.

  12. Biochemical alterations in cerebrospinal fluid during thoracoabdominal aortic cross-clamping in dogs.

    Science.gov (United States)

    Nagy, G; Dzsinich, Cs; Selmeci, L; Sepa, G; Dzsinich, M; Kékesi, V; Juhász-Nagy, A

    2002-07-01

    Spinal cord damage during and after thoracoabdominal aortic cross-clamping continues to be a major problem. Somatosensory and motor evoked potentials have been used to monitor spinal cord function but their value for predicting paraplegia has been controversial. The aim of this study was to measure biochemical markers in the cerebrospinal fluid (CSF) and correlate changes with spinal cord ischemia. Since neural tissue utilizes only glucose as substrate for its metabolism and energy supply, we measured changes of metabolites of anaerobe glycolysis. In a canine model in which general anesthesia was used, the thoracoabdominal aorta was cross-clamped proximally and distally for 60 min. Hemodynamic parameters, blood gases, and glucose level were monitored continuously. Blood and CSF sampling were performed at baseline, at 15, 30, and 55 min during cross-clamping, and at 5 and 15 min after aortic declamping. Levels of lactate (1.7 +/- 0.1 to 3.2 +/- 0.3 mmol/L), pCO2 (43 +/- 2 to 35 +/- 1.6 mmHg), and neuron-specific enolase (NSE) (5.17 +/- 0.5 to 13.0 +/- 3.5 mg/L) in CSF showed significant changes (p < 0.05) during clamping and reperfusion. Changes in CSF lactate and NSE levels correlate with the duration of spinal cord ischemia. These markers of ischemic metabolism appear suitable to monitor the degree of spinal cord ischemia during thoracoabdominal cross-clamping and may be useful to predict the efficacy of preventive methods.

  13. Infrared video patch-clamp technique for spiral ganglion neurons in rat cochlear slices.

    Science.gov (United States)

    Zha, Ding-Jun; Lin, Ying; Wang, Zhi-Ming; Lu, Lian-Jun; Xue, Tao; Gao, Xue; Li, Yun-Qing; Qiao, Li; Qiu, Jian-Hua

    2009-05-01

    Cochlear slice and infrared video patch-clamp techniques can be used in real-time observation. They provide a good method and platform for further study of the electrophysiological properties and auditory transduction mechanism of spiral ganglion neuron (SGN). To establish the isolated rat cochlear slice technique combined with the infrared video patch-clamp technique to explore the electrophysiological properties of the SGN. SD rats were divided into three groups according to postnatal days (0-2 days, 3-6 days and 7-14 days). After quickly making SD rat cochlear slices, the electrophysiological properties of the SGN were observed using the infrared differential interference contrast technique and patch-clamp recording, and the factors that affect the cochlear slice quality and patch-clamp recording were analysed. The successful slice rate was highest in 3-6-day-old SD rats and two to four slices could be prepared using each cochlea. It is crucial to maintain the connection of partial skull with the cochlea and the volute integrity when producing slices. The position of the cochlear axis and blade, and the slice preparation time were also important factors affecting slice quality and cell activity. SGN cells in good condition could easily be found using the infrared video patch-clamp technique to help the assessment of the seal test process. SGN resting membrane potential of whole-cell recording was -45.6+/-5.3 mV (n=52) and the currents of Na+ and K+ could be recorded.

  14. Applicability of fiber model in seismic response analysis for center-clamp type bushings on transformers

    International Nuclear Information System (INIS)

    Miyagawa, Yoshinori; Sato, Hiroaki

    2015-01-01

    A bushing is a device for insulation and support of a conductor. Especially it is called center-clamp type when it is connected with a metal holder through clamping force. As a consequence of damage of center-clamp type bushings in Tohoku Earthquake in 2011, refinement of the response analysis method and review of the seismic design procedure became necessary. In the present report, the fiber model, which can evaluate non-linear behavior in the section subjected to axial force and bending moment, was implemented to the CRIEPI's finite element analysis program 'Mastrd' considering following characteristics of center-clamp type bushings. a) The gasket section between a porcelain tube and a metal holder has a torus shape. b) Springs around the top of the bushing give clamping force, but they lock in excessive base rotation. c) The gasket does not resist against tension. d) Local resistance against compression due to bending increases in use of very thin gaskets. The developed program was verified through comparison with the shaking table test result for real bushings whose voltage classes were 154 kV and 275 kV. Deformation indices as rotation angle and base opening due to bending were influenced by damping conditions. Though there was not the condition which brought about remarkable underestimation, reduction of damping for a fiber model element was preferable for safety. On the other hand, bending moment was consistent with experimental results because it tended not to fluctuate in the non-linear region. (author)

  15. Computed tomographic fluoroscopy-guided transthoracic needle biopsy for diagnosis of pulmonary nodules

    International Nuclear Information System (INIS)

    Hirose, Takashi; Mori, Kiyoshi; Machida, Suguru; Tominaga, Keigo; Yokoi, Kohei; Adachi, Mitsuru

    2000-01-01

    The purpose of this study was to evaluate the usefulness of computed tomographic (CT) fluoroscopy-guided transthoracic needle biopsy (TTNB) with an 18-gauge automatic biopsy gun for the diagnosis of pulmonary nodules. Between March 1996 and January 1998, 50 patients in whom pulmonary lesions could not be diagnosed cytopathologically with fiberoptic bronchoscopy or were not clearly visualized with fluoroscopy underwent CT fluoroscopy-guided TTNB. Final pathological diagnoses were 23 lung carcinomas, five pulmonary metastases and 22 benign lesions. Sufficient tissue for analysis was obtained from 48 of the 50 lesions (96%). The overall diagnostic yield of CT fluoroscopy-guided TTNB was 90%. The sensitivity, specificity and accuracy for malignancy were 89%, 100% and 94%, respectively. In 20 of the 22 cases (91%) of benign lesions, histological analysis yielded correct and specific diagnoses. Complications occurred in 22 of the 50 cases (44%). The most common complication was pneumothorax, which occurred in 21 of the 50 cases (42%). Chest tube insertion was required in 6 (12%). Although CT fluoroscopy could not decrease the complication rate, CT fluoroscopy-guided TTNB with an automatic biopsy gun appears to be a promising technique for diagnosing pulmonary lesions, particularly benign lesions. (author)

  16. An observational study of umbilical cord clamping practices of maternity care providers in a tertiary care center.

    Science.gov (United States)

    Hutton, Eileen K; Stoll, Kathrin; Taha, Natalie

    2013-03-01

    Severing the umbilical cord at birth is likely the oldest intervention, the timing of which remains fraught with controversy. Emerging evidence suggests benefit in delaying cord clamping for both term and preterm infants. The objective of this study was to investigate actual cord clamping time and circumstances at a large tertiary care center in Canada. We used a stopwatch to time the interval from the time the infant was born as far as the umbilicus until the time that the umbilical cord was clamped before cutting. We reported on timing of the umbilical cord clamping overall and by practitioner group (obstetrician, midwife, and family practitioner). A total of 98 women and their practitioners consented to be observed at the British Columbia Women's Hospital and Health Center, Vancouver, Canada. More than one-half (56.2%) of all infants had their umbilical cord clamped within 15 seconds. The median (5th, 95th percentile) clamping time in seconds for the full sample was 12 (4, 402) with practitioner subgroups as follows: obstetricians (12 [3, 107]), family physicians (19 [6, 325]), and midwives (81 [6, undefined]). The median clamping time was likely to be longer when the birth occurred spontaneously, no umbilical cord blood was collected, and no birth or neonatal complications occurred. In our sample taken in 2006 to 2007, most infants had umbilical cords clamped immediately after the birth, with more than one-half clamped within 15 seconds of birth. Since the time of our study, delayed umbilical cord clamping for the healthy term newborn has become a part of recommended management of third stage of labor and resuscitation guidelines. It would be informative to repeat a study like this one to determine compliance with the current standards of care. © 2013, Copyright the Authors Journal compilation © 2013, Wiley Periodicals, Inc.

  17. Diagnostic Value of Guided Biopsies: Fusion and Cognitive-registration Magnetic Resonance Imaging Versus Conventional Ultrasound Biopsy of the Prostate

    Science.gov (United States)

    Oberlin, Daniel T.; Casalino, David D.; Miller, Frank H.; Matulewicz, Richard S.; Perry, Kent T.; Nadler, Robert B.; Kundu, Shilajit; Catalona, William J.; Meeks, Joshua J.

    2016-01-01

    Objective To better assess the increased utilization of multiparametric magnetic resonance imaging (mpMRI) and fusion biopsy of the prostate, we compared prostate cancer detection rates among (a) men undergoing MR-ultrasound (US) fusion biopsy, (b) mpMRI cognitive-registration biopsy, and (c) conventional transrectal US-guided biopsy for the detection of prostate cancer. Materials and Methods We present a retrospective review of consecutive patients undergoing mpMRI of the prostate with subsequent prostate biopsy from October 2013 to September 2015. Lesions concerning for prostate cancer visualized on mpMRI were targeted with cognitive-registration or MR-US fusion biopsies. A cohort of men undergoing conventional prostate biopsy was utilized for comparison. Rates of cancer detection were compared among the 3 cohorts. Results A total of 231 patients underwent mpMRI-targeted biopsy (81 fusion, 150 cognitive). There was no difference in prostate specific antigen, mpMRI-defined Prostate Imaging Reporting and Data System score or number of lesions, or history of prostate cancer among the cohorts. The overall detection rate of cancer was significantly higher in the fusion cohort (48.1%) compared with both the cognitive (34.6% P = .04) and conventional (32.0%, P = .03) cohorts. Cancer detection rates were comparable in the MRI-cognitive and transrectal prostate US biopsy groups (34.6% vs 32%). MR fusion detected significantly more Gleason ≥7 cancer (61.5 vs 37.5%, P = .04) and significantly less Gleason 6 cancer (38.5 vs 62.5%, P = .04) compared with conventional biopsy. Conclusion Targeted biopsy of the prostate using MR-US fusion increased the cancer detection rate compared with both cognitive registration and conventional biopsy and was associated with detection of higher-grade cancer compared with conventional biopsy. PMID:26966043

  18. Terror management theory in dermatology: skin biopsy influences patient compliance.

    Science.gov (United States)

    Kim, Jae Hwan; Kim, Joonhwan; Jung, You-Hee; Yi, Youjae; Ahn, Hyo Hyun

    2010-05-01

    A skin biopsy is one of the most frequently performed procedures in the dermatology outpatient clinic, but doctors often do not consider the cognitive impact of the biopsy procedure. Based on "terror management theory," we reasoned that a skin biopsy increases patient compliance by unconsciously stimulating mortality salience. To study this hypothesis, trust toward doctors, authoritarian personality, mood, attitude toward recommendations, and intention to accept recommendations were compared be-tween skin biopsy and non-skin biopsy groups of patients. Eighty-three patients participated in the study, and 78 responses were used for the analysis. The results showed that patients who had a skin biopsy had a more positive attitude toward doctors' recommendations and a higher intention to follow the recommendations. These effects were not moderated by the patient's own personality (patient trust and authoritarian personality). The outcome of this study implies that performing a procedure itself can subliminally influence a patient's attitude toward a doctor's recommendations.

  19. Utility of skin biopsy in management of small fiber neuropathy.

    Science.gov (United States)

    Boruchow, Scott A; Gibbons, Christopher H

    2013-12-01

    We examined the role of skin biopsy in the evaluation and management of patients with suspected small fiber neuropathy (SFN). A retrospective chart review was performed among all patients who underwent skin biopsy for evaluation of SFN at our institution between March 2008 and March 2011. Change in management was defined as a new diagnosis or change in treatment in response to both positive and negative skin biopsies. Among 69 patients who underwent skin biopsy, 25 had pathological evidence of an SFN, and 9 had evidence of borderline SFN. Change in management or diagnosis occurred in 14 of 25 patients with definite SFN, 6 of 9 patients with borderline SFN, and 16 of 35 biopsy negative patients. Skin biopsy changed management or diagnosis in 52% of patients evaluated for a possible SFN and appears to play a valuable role in the workup of these patients. Copyright © 2013 Wiley Periodicals, Inc.

  20. A Hybrid Model for Safety Pharmacology on an Automated Patch Clamp Platform: Using Dynamic Clamp to Join iPSC-Derived Cardiomyocytes and Simulations of Ik1 Ion Channels in Real-Time

    Directory of Open Access Journals (Sweden)

    Birgit Goversen

    2018-01-01

    Full Text Available An important aspect of the Comprehensive In Vitro Proarrhythmia Assay (CiPA proposal is the use of human stem cell-derived cardiomyocytes and the confirmation of their predictive power in drug safety assays. The benefits of this cell source are clear; drugs can be tested in vitro on human cardiomyocytes, with patient-specific genotypes if needed, and differentiation efficiencies are generally excellent, resulting in a virtually limitless supply of cardiomyocytes. There are, however, several challenges that will have to be surmounted before successful establishment of hSC-CMs as an all-round predictive model for drug safety assays. An important factor is the relative electrophysiological immaturity of hSC-CMs, which limits arrhythmic responses to unsafe drugs that are pro-arrhythmic in humans. Potentially, immaturity may be improved functionally by creation of hybrid models, in which the dynamic clamp technique joins simulations of lacking cardiac ion channels (e.g., IK1 with hSC-CMs in real-time during patch clamp experiments. This approach has been used successfully in manual patch clamp experiments, but throughput is low. In this study, we combined dynamic clamp with automated patch clamp of iPSC-CMs in current clamp mode, and demonstrate that IK1 conductance can be added to iPSC-CMs on an automated patch clamp platform, resulting in an improved electrophysiological maturity.