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Sample records for cava svc reconstruction

  1. Treatment of Superior Vena Cava (SVC) Syndrome and Inferior Vena Cava (IVC) Thrombosis in a Patient with Colorectal Cancer: Combination of SVC Stenting and IVC Filter Placement to Palliate Symptoms and Pave the Way for Port Implantation

    International Nuclear Information System (INIS)

    Thrombosis of the inferior vena cava is a life-threatening complication in cancer patients leading to pulmonary embolism. These patients can also be affected by superior vena cava syndrome causing dyspnea followed by trunk or extremity swelling. We report the case of a 61-year-old female suffering from an extended colorectal tumor who became affected by both of the mentioned complications. Due to thrombus formation within the right vena jugularis interna, thrombosis of the inferior vena cava, and superior vena cava syndrome, a combined interventional procedure via a left jugular access with stenting of the superior vena cava and filter placement into the inferior vena cava was performed As a consequence, relief of the patient's symptoms, prevention of pulmonary embolism, and paving of the way for further venous chemotherapy were achieved.

  2. SVC obstruction

    Science.gov (United States)

    ... Lymphoma Metastatic lung cancer (lung cancer that spreads) Testicular cancer Thyroid cancer Thymus tumor Superior vena cava obstruction ... Complications are serious and can sometimes be fatal. Prevention Prompt treatment of other medical disorders may reduce ...

  3. Acute lymphoid leukemia presenting with superior vena cava syndrome

    OpenAIRE

    Mohammad Emami Ardestani; Firouzeh Moeinzadeh

    2013-01-01

    When superior vena cava (SVC) compress or obstructed by internal or external pressure, we encounter to SVC syndrome. The cause of this compression is malignant or benign. Although the widespread use of permanent central venous access catheters coupled with the improved success of chemotherapy has increased the incidence of SVC syndrome not caused by direct tumor infiltration (non-malignant SVC syndrome) but SVC syndrome may be a sign of advanced malignancy. In this report, we present a 30-yea...

  4. Combined Double Sleeve Lobectomy and Superior Vena Cava Resection for Non-small Cell Lung Cancer with Persistent Left Superior Vena Cava.

    Science.gov (United States)

    Zhu, Daxing; Qiu, Xiaoming; Zhou, Qinghua

    2015-11-01

    A 65-year-old man with right central type of lung squamous carcinoma was admitted to our department. Bronchoscopy displayed complete obstruction of right upper lobe bronchus and infiltration of the bronchus intermedius with tumor. Chest contrast computed tomography revealed the tumor invaded right pulmonary artery, superior vena cava, and the persistant left superior vena cava flowed into the coronary sinus. The tumor was successfully removed by means of bronchial and pulmonary artery sleeve resection of the right upper and middle lobes combined with resection and reconstruction of superior vena cava (SVC) utilizing ringed polytetrafluoroethylene graft. To the best of our knowledge, this was the first report of complete resection of locally advanced lung cancer involving superior vena cava, right pulmonary artery trunk and main bronchus with persistant left superior vena cava. PMID:26582230

  5. Combined Double Sleeve Lobectomy and Superior Vena Cava Resection for Non-small Cell Lung Cancer with Persistent Left Superior Vena Cava

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    Daxing ZHU

    2015-11-01

    Full Text Available A 65-year-old man with right central type of lung squamous carcinoma was admitted to our department. Bronchoscopy displayed complete obstruction of right upper lobe bronchus and infiltration of the bronchus intermedius with tumor. Chest contrast computed tomography revealed the tumor invaded right pulmonary artery, superior vena cava, and the persistant left superior vena cava flowed into the coronary sinus. The tumor was successfully removed by means of bronchial and pulmonary artery sleeve resection of the right upper and middle lobes combined with resection and reconstruction of superior vena cava (SVC utilizing ringed polytetrafluoroethylene graft. To the best of our knowledge, this was the first report of complete resection of locally advanced lung cancer involving superior vena cava, right pulmonary artery trunk and main bronchus with persistant left superior vena cava.

  6. Leiomyosarcoma of the inferior vena cava level II involvement: curative resection and reconstruction of renal veins

    Directory of Open Access Journals (Sweden)

    Wang Quan

    2012-06-01

    Full Text Available Abstract Leiomyosarcoma of the inferior vena cava (IVCL is a rare retroperitoneal tumor. We report two cases of level II (middle level, renal veins to hepatic veins IVCL, who underwent en bloc resection with reconstruction of bilateral or left renal venous return using prosthetic grafts. In our cases, IVCL is documented to be occluded preoperatively, therefore, radical resection of tumor and/or right kidney was performed and the distal end of inferior vena cava was resected and without caval reconstruction. None of the patients developed edema or acute renal failure postoperatively. After surgical resection, adjuvant radiation therapy was administrated. The patients have been free of recurrence 2 years and 3 months, 9 months after surgery, respectively, indicating the complete surgical resection and radiotherapy contribute to the better survival. The reconstruction of inferior vena cava was not considered mandatory in level II IVCL, if the retroperitoneal venous collateral pathways have been established. In addition to the curative resection of IVCL, the renal vascular reconstruction minimized the risks of procedure-related acute renal failure, and was more physiologically preferable. This concept was reflected in the treatment of the two patients reported on.

  7. Superior vena cava syndrome in hemodialysis patient

    Directory of Open Access Journals (Sweden)

    Azeb Molhem

    2011-01-01

    Full Text Available Obstruction of blood flow in the superior vena cava (SVC results in symptoms and signs of SVC syndrome. SVC obstruction can be caused either by invasion or external compression of the SVC by contagious pathologic processes involving the right lung, lymph nodes, and other mediastinal structures, or by thrombosis of blood within the SVC. Occasionally, both mechanisms co-exist. We hereby report a case of a 28-year-old male, Saudi patient who was diagnosed with end-stage renal disease and was maintained on regular hemodiaysis via right jugular vein dual lumen catheter for ten months. Three years later, the patient presented with signs and symptoms suggestive of SVC obstruction that was successfully managed with SVC stenting.

  8. Ectopic Triggers of Superior Vena Cava in Atrial Fibrillation

    Directory of Open Access Journals (Sweden)

    Jayasree Pillarisetti MD

    2009-04-01

    Full Text Available Superior vena cava (SVC triggers constitute 6- 8% of non-pulmonary vein (PV foci that initiate atrial fibrillation (AF.1 Since SVC cardiomyocytes originate from the right sinus horn they possess enhanced automacity and after-depolarization leading to arrhythmogenicity.2 In a recent study by Arruda et al. 12% of patients had SVC triggers and empiric adjunctive isolation of SVC-right atrium along with PVisolation resulted in higher long term success rate than the group that underwent PVI alone. They demonstrated that adjunctive isolation of SVC along with PV isolation (PVI is a safe and feasible strategy for ablation of AF.

  9. Decompression of superior vena cava during bidirectional Glenn shunt

    OpenAIRE

    Kulkarni Venugopal; Mudunuri Ravikiran; Mulavisala Krishnaprasad; Byalal R

    2009-01-01

    Patients undergoing bi-directional Glenn shunt for various congenital anomalies of the heart will have their superior vena cava (SVC) clamped during the procedure. The duration of the procedure is variable, ranging from five to 30 minutes. This can affect the cerebral perfusion due to raised venous pressure [Cerebral blood flow = Mean arterial pressure − (Intracranial pressure + Central venous pressure)]. Shunting away the SVC blood is a well known technique to counter this probl...

  10. Electrophysiological characteristics of paroxysmal atrial fibrillation originating from superior vena cava: a clinical analysis of 30 cases

    OpenAIRE

    Shi, Xiang-min; YUAN, HONG-TAO; Guo, Hong-Yang; Guo, Jian-Ping; Shan, Zhao-Liang; Wang, Yu-tang

    2015-01-01

    To analyze characteristics of electrocardiogram (ECG), electrophysiological intracardiac mapping and radiofrequency ablation (RF) of paroxysmal atrial fibrillation (PAF) originating from superior vena cava (SVC), aiming to investigate electrophysiological characteristics of PAF with SVC origin. Clinical data of 30 subjects (18 men and 12 women, aged, 58.6 ± 15.5 years) with PAF of SVC origin were retrospectively analyzed; All patients underwent RF during 2006.9-2012.7. ECG of AF and atrial pr...

  11. Dramatic response of follicular thyroid carcinoma with superior vena cava syndrome and tracheal obstruction to external-beam radiotherapy

    Energy Technology Data Exchange (ETDEWEB)

    Wilford, M.R.; Chertow, B.S.; Lepanto, P.B.; Leidy, J.W. Jr. (Section of Endocrinology, Marshall University School of Medicine, Huntington, West Virginia (USA))

    1991-06-01

    We report a patient with follicular thyroid carcinoma progressing to superior vena cava (SVC) syndrome and tracheal obstruction despite multiple doses of radioactive iodine therapy but subsequently responding dramatically to external-beam radiotherapy (RT). Although RT is not considered to be the treatment of choice for follicular carcinoma, RT in our patient produced unequivocal improvement of SVC syndrome and tracheal obstruction.

  12. Successful Venous Angioplasty of Superior Vena Cava Syndrome after Heart Transplantation

    Directory of Open Access Journals (Sweden)

    Thomas Strecker

    2014-01-01

    Full Text Available Introduction. For patients with terminal heart failure, heart transplantation (HTX has become an established therapy. Before transplantation there are many repeated measurements with a pulmonary artery catheter (PAC via the superior vena cava (SVC necessary. After transplantation, endomyocardial biopsy (EMB is recommended for routine surveillance of heart transplant rejection again through the SVC. Case Presentation. In this report, we present a HTX patient who developed a SVC syndrome as a possible complication of all these procedures via the SVC. This 35-year-old Caucasian male could be successfully treated by balloon dilatation/angioplasty. Conclusion. The SVC syndrome can lead to pressure increase in the venous system such as edema in the head and the upper part of the body and further serious complications like cerebral bleeding and ischemia, or respiratory problems. Balloon angioplasty and stent implantation are valid methods to treat stenoses of the SVC successfully.

  13. [Mediastinal Mature Teratoma Necessitating Resection of Superior Vena Cava].

    Science.gov (United States)

    Aragaki, Masato; Iimura, Yasuaki; Hasegawa, Naoto; Kaga, Kichizo

    2015-09-01

    A 43-year-old woman was referred to our hospital for an abnormal shadow on chest X-ray. Computed tomography revealed a tumor with calcification of 9.8 cm in size at the anterior mediastinum. The infiltration into the left brachiocephalic vein and superior vena cava by tumor was suspected. Surgery was performed under a diagnosis of mature teratoma. The tumor was found to adhere firmly to superior vena cava (SVC), left brachiocephalic vein, right phrenic nerve, and the arch of the azygos vein. To ensure the blood flow, an artificial blood vessel was placed between left brachiocephalic vein and right atrium. Then SVC was clamped and the tumor was resected with the part of SVC. PMID:26329629

  14. Obstruction of Vena Cava and Collateral Flow after Abdominal Reconstruction for Gastroschisis

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    Wenceslao M. Calonge, MD

    2015-02-01

    Full Text Available Summary: The upper limit of intra-abdominal pressure after closure of gastroschisis has been suggested around 20 mm Hg. An acute abdominal compartmental syndrome may produce intestinal ischemia with perforation and hepatic or renal failure. We present a case of a baby born with gastroschisis and ileal atresias 2 decades ago. The closure of the defect entailed a borderline abdominal compartmental syndrome with caval occlusion and development of collateral venous circulation. This was evidenced by a phlebographic study at the age of 8. At the age of 19, the patient continued to show a superficial, varicose net and some aesthetic concerns. This minor condition seems not previously reported. The authors intend to raise awareness about current methods for indirect assessment of intra-abdominal pressure when performing abdominal reconstruction for a gastroschisis defect.

  15. A case of a bloated face: SVC syndrome relieved by an endovascular approach.

    Science.gov (United States)

    Szerlip, Molly; Singh, Gundeep; Luft, Ulrich C

    2012-02-01

    Superior vena cava (SVC) syndrome, or obstruction of blood returning from the head and upper extremities, is a syndrome that is rapidly increasing in the cardiovascular patient population due to the increasing use of transvenous devices such as permanent pacemakers, implantable cardioverter defibrillators (ICDs), and indwelling venous access devices for hemodialysis. This syndrome in the past has been seen predominately in the cancer population with malignancy being the most common reason for SVC syndrome. The management of this syndrome has largely been with a medical/supportive care approach or with surgical bypass. Given the advancement in the field of endovascular interventions and the increasing expertise in performing these procedures, an endovascular approach to relieving the SVC obstruction is rapidly becoming the treatment of choice for these patients. We describe a case of a patient who had a chronic indwelling port-a-cath who developed SVC syndrome, which was treated with an endovascular approach with stenting of the SVC/brachiocephalic vein junction.  PMID:21599752

  16. Treatment of pacemaker-induced superior vena cava syndrome by balloon angioplasty and stenting.

    LENUS (Irish Health Repository)

    Klop, B

    2011-01-01

    Superior vena cava (SVC) syndrome is a rare but serious complication after pacemaker implantation. This report describes three cases of SVC syndrome treated with venoplasty and venous stenting, with an average follow-up of 30.7 (±3.1) months. These cases illustrate that the definitive diagnosis, and the extent and location of venous obstruction, can only be determined by venography.

  17. Superior Vena Cava Syndrome due to Thrombosis: A Rare Paraneoplastic Presentation of Bronchogenic Carcinoma

    Directory of Open Access Journals (Sweden)

    Avradip Santra

    2016-07-01

    Full Text Available Superior vena cava (SVC syndrome is not an uncommon occurrence in patients with malignancy and it is often described as a medical emergency. In majority of the cases, SVC syndrome occurs due to mechanical obstruction of the SVC by extraluminal compression with primary intrathoracic malignancies. However, intraluminal obstruction due to thrombosis can also produce symptoms and signs of SVC syndrome. Clot-related SVC obstruction is mostly associated with indwelling central venous catheter and pacemaker leads, although such thrombosis can occur spontaneously in a background of a hypercoagulable state, e.g., malignancy. Here, an unusual case of sudden onset SVC syndrome has been reported, which on initial radiologic evaluation was found to have a lung nodule without any significant mediastinal mass or adenopathy compressing SVC. Subsequent investigation with Doppler ultrasonography of the neck showed thrombosis in the right internal jugular, right subclavian and right brachiocephalic vein, which was responsible for SVC syndrome. Histopathological evaluation of lung nodule confirmed presence of an adenocarcinoma. Therefore, venous thromboembolism as a paraneoplastic syndrome should be kept in mind while evaluating a case of SVC obstruction in a cancer patient. Management of the underlying disease is of prime importance in such cases and anticoagulation is the mainstay of therapy. Ability to identify paraneoplastic syndrome may have a significant effect on clinical outcome, ranging from early diagnosis to improved quality of life of the patient.

  18. The characteristics of action potential and nonselec-tive cation current of cardiomyocytes in rabbit superior vena cava

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    As a special focus in initiating and maintaining atrial fibrillation (AF), cardiomyocytes in superior vena cava (SVC) have distinctive electrophysiological characters. In this study, we found that comparing with the right atrial (RA) cardiomyoctyes, the SVC cardiomyoctyes had longer APD90 at the different basic cycle lengths; the conduction block could be observed on both RA and SVC cardiomyoctyes. A few of SVC cardiomyoctyes showed slow response action potentials with automatic activity and some others showed early afterdepolarization (EAD) spontaneously. Further more, we found that there are nonselective cation current (INs) in both SVC and RA cardiomyocytes. The peak density of INs in SVC cardiomyocytes was smaller than that in RA cardiomyocytes. Removal of extracellular divalent cation and glucose could increase INs in SVC cardiomyocytes. The agonist or the antagonist of INs may in-crease or decrease APD. To sum up, some SVC cardiomyocytes possess the ability of spontaneous activity; the difference of transmembrane action potentials between SVC and RA cardiomyocytes is partly because of the different density of INs between them; the agonist or the antagonist of INs can in-crease or decrease APD leading to the enhancement or reduction of EAD genesis in SVC cardiomyo-cytes. INs in rabbit myocytes is fairly similar to TRPC3 current in electrophysiological property, which might play an important role in the mechanisms of AF.

  19. Long-term success of endovascular treatment of benign superior vena cava occlusion with chylothorax and chylopericardium

    Energy Technology Data Exchange (ETDEWEB)

    Veroux, Pierfrancesco; Veroux, Massimiliano; Bonanno, Maria Giovanna; Tumminelli, Maria Giuseppina [Department of Surgery and Transplantation, University Hospital, Via S. Sofia, 78, 95123 Catania (Italy); Baggio, Elda [Department of Surgery and Gastroenterological Sciences, University Hospital of Verona (Italy); Petrillo, Giuseppe [Department of Radiology, University Hospital, Via S. Sofia, 78, 95123 Catania (Italy)

    2002-07-01

    The most likely etiology of benign obstruction of the superior vena cava (SVC) include fibrosing mediastinitis and iatrogenic etiologies such as sclerosis and obstruction caused by pacemakers and central venous catheter. Percutaneous stenting of SVC has been used with success both in malignant and benign superior vena cava syndrome; however, long-term follow-up of endovascular procedures is not well known. We present a case of a patient with complete occlusion of SVC of benign etiology, presenting dramatically with bilateral chylothorax and chylopericardium with cardiac tamponade, who underwent successful vena caval revascularization with thrombolytic therapy and placement of self-expanding metallic stent. The 42-month follow-up could encourage endovascular procedures even in SVC syndrome of benign etiology. (orig.)

  20. Innominate vein-right atrial bypass for relief of superior vena cava syndrome due to pacemaker lead thrombosis.

    Science.gov (United States)

    Deo, Salil V; Burkhart, Harold M; Araoz, Philip A; Brady, Peter A

    2010-11-01

    We present a patient with superior vena cava (SVC) obstruction due to multiple intraluminal pacemaker leads. Previous attempts at balloon dilatation of the SVC and surgical angioplasty did not provide a long-term solution. A Gore-Tex (W. L. Gore & Associates, Flagstaff, AZ, USA) conduit interposed between the innominate vein and right atrial appendage has resulted in symptomatic relief at a follow-up of 6 months. PMID:21039859

  1. Endovascular stenting in superior vena cava syndrome: utility of a through-and-through guidewire technique

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    Clark, T.W.I. [Dalhousie Univ., Queen Elizabeth II Health Sciences Centre, Section of Interventional Radiology, Dept. of Diagnostic Imaging, Halifax, NS (Canada)

    2000-08-01

    Objective: To describe an ancillary technique when a conventional femoral approach to superior vena cava (SVC) stent placement is not feasible because of buckling of balloon catheters or stent-deployment systems during device advancement. Patients and methods: Three patients in whom device advancement across the SVC lesion from a femoral or axillary approach was unsuccessful were managed by accessing the right jugular vein; SVC lesions were crossed from an antegrade direction, and the jugular guidewire was secured at the femoral access site to create a through-and-through guidewire. Results: Countertraction on the through-and-through guidewire during stent placement and dilation permitted unhindered advancement of stent delivery systems and catheters across the SVC. Technical and clinical success was achieved in each patient with relief of SVC syndrome within 24-72 hours. Survival ranged from 26 to 137 days. Conclusion: A through-and-through guidewire technique is useful when stenting a highly stenotic or thrombosed SVC in patients with superior vena cava syndrome. (author)

  2. Dialysis catheter-related superior vena cava syndrome with patent vena cava: Long term efficacy of unilateral viatorr stent-graft avoiding catheter manipulation

    International Nuclear Information System (INIS)

    Central venous catheters are the most frequent causes of benign central vein stenosis. We report the case of a 79-year-old woman on hemodialysis through a twin catheter in the right internal jugular vein, presenting with superior vena cava (SVC) syndrome with patent SVC. The clinically driven endovascular therapy was conducted to treat the venous syndrome with a unilateral left brachiocephalic stent-graft without manipulation of the well-functioning catheter. The follow-up was uneventful until death 94 months later.

  3. Dialysis catheter-related superior vena cava syndrome with patent vena cava: Long term efficacy of unilateral viatorr stent-graft avoiding catheter manipulation

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    Quaretti, Pietro; Galli, Franco; Maramarco, Lorenzo Paplo; Corti, Riccardo; Leati, Giovanni; Fiorina, Ilaria; Maestri, Marcello [IRCCS Policlinico San Matteo Foundation, Pavia (Italy)

    2014-06-15

    Central venous catheters are the most frequent causes of benign central vein stenosis. We report the case of a 79-year-old woman on hemodialysis through a twin catheter in the right internal jugular vein, presenting with superior vena cava (SVC) syndrome with patent SVC. The clinically driven endovascular therapy was conducted to treat the venous syndrome with a unilateral left brachiocephalic stent-graft without manipulation of the well-functioning catheter. The follow-up was uneventful until death 94 months later.

  4. The implantation of retrievable superior vena cava filter: report of 6 cases

    International Nuclear Information System (INIS)

    Objective: To discuss the techniques and clinical value of the placement of retrievable superior vena cava (SVC) filter. Methods: Under DSA guidance, the placement of retrievable SVC filter was performed in 6 patients with jugular vein thrombosis or upper extremity deep vein thrombosis. The diagnoses were proved by colour Doppler ultrasound and venography. All patients were affected with malignancy. The venous thrombosis was caused by the insertion of PICC (n=3) or by the compression or invasion of tumor (n=3). Catheterization was carried out via the right femoral vein. After venography of SVC, the delivery system of SVC filter was inserted into SVC, and the filter was placed at the site slightly below the confluence of brachiocephalic veins. The retrieval of the filter was performed through the femoral vein route. Results: The retrievable filter was successfully placed in SVC in all cases. No dislodgement or migration of the filters occurred during the procedure. The filter was successfully retrieved via the femoral vein in two cases at 15 days and 28 days after the placement respectively as color Dopper ultrasound showed that the venous thrombus disappeared. The remaining 4 patients were unwilling to take the procedure of filter retrieval. All the patients were followed up periodically. During the follow-up course, five patients died of some causes (deterioration of the tumor, etc.) unrelated to filter placement in 2-16 months after the procedure. No serious complications such as SVC thrombosis, pulmonary embolism, migration of filter, vascular perforation, etc. occurred. Conclusion: The placement of retrievable SVC filter is technically simple, clinically feasible and safe, and the filter can be retrieved easily. This technique is very useful for preventing both the pulmonary embolism caused by jugular vein or upper extremity deep vein thrombosis and the complications related to long-term retention of the filter within SVC. (authors)

  5. Azygos Tip Placement for Hemodialysis Catheters in Patients with Superior Vena Cava Occlusion

    International Nuclear Information System (INIS)

    Chronic central venous access is necessary for numerous life-saving therapies. Repeated access is complicated by thrombosis and occlusion of the major veins, such as the superior vena cava (SVC), which then require novel vascular approaches if therapy is to be continued. We present two cases of catheterization of the azygos system in the presence of an SVC obstruction. We conclude that the azygos vein may be used for long-term vascular access when other conduits are unavailable and that imaging studies such as magnetic resonance venography, contrast-enhanced computed tomography or conventional venography can be employed prior to the procedure to aid with planning and prevent unforeseen complications

  6. Downhill oesophageal varices resulting from superior vena cava graft occlusion after resection of a thymoma†

    Science.gov (United States)

    Inoue, Yoshimasa; Sakai, Shoji; Aoki, Teruhiro

    2013-01-01

    Downhill oesophageal varices (DEV) may occur as a rare complication of superior vena cava (SVC) obstruction. DEV are usually associated with SVC obstruction caused by systemic vasculitis or mediastinal tumours. In this report, we describe a very rare case of DEV resulting from SVC graft occlusion after resection of a thymoma. A 66-year old man with an invasive thymoma was treated by radical resection and bypass grafting from the right brachiocephalic vein to the right atrium. Occlusion of the SVC graft was diagnosed postoperatively; however, the patient could be managed conservatively. Although there had been no significant findings in the oesophagus in previous endoscopic examinations, grade F2 varices were found in the proximal oesophagus in the 19th postoperative month, and DEV caused by SVC graft occlusion was diagnosed. Until now, 2 years since the diagnosis, no apparent symptoms or deterioration of the DEV have been observed. The possible development of DEV should be borne in mind during the follow-up of patients with postoperative SVC graft occlusion. PMID:23686892

  7. SVC bitstream adaptation in MPEG-21 multimedia framework

    Institute of Scientific and Technical Information of China (English)

    THANG Truong Cong; KIM Young Suk; RO Yong Man; KANG Jungwon; KIM Jae-Gon

    2006-01-01

    Scalable video coding (SVC) is the most promising video format for applications of collaborative communication.MPEG-21 standard has newly emerged to enable the interoperability of multimedia delivery in heterogeneous environments. In this paper we study adaptation of SVC bitstream in the context of MPEG-21 multimedia framework. For interfacing SVC bitstream with MPEG-21 based adaptation system, we propose three SVC specific adaptation operators. Based on our previous work with multidimensional video adaptation, we present an effective approach, using MPEG-21 DIA AdaptationQoS description tool,to model QoS control for SVC adaptation. Then we show how the operator values could be computed from that representation. For the actual adaptation at bitstream level, we propose a procedure to remove the unnecessary NAL units from an SVC bitstream. The result of this study enables QoS management of SVC streaming in an efficient and standardized manner.

  8. Surgical repair for giant ascending aortic aneurysm to superior vena cava fistula with positive syphilitic test.

    Science.gov (United States)

    Sekine, Yuji; Yamamoto, Shin; Fujikawa, Takuya; Oshima, Susumu; Ono, Makoto; Sasaguri, Shiro

    2015-10-01

    Syphilitic aortitis is usually associated with thoracic aortic saccular aneurysm, aortic regurgitation and coronary ostial stenosis. However, syphilitic aneurysms have rarely been reported today. Here, we report a patient with ascending aortic aneurysm with aorta-superior vena cava (SVC) fistula with positive syphilitic test. A 52-year-old man was admitted to our institution with a giant ascending aortic aneurysm complicated with SVC syndrome. Computed tomography revealed a giant ascending aneurysm 79 mm in diameter. The result of serodiagnostic tests for syphilis had not been judged yet preoperatively. Total arch replacement concomitant with elephant trunk was performed. Intraoperatively, we detected the ascending aorta to SVC fistula. Postoperatively, we suspected the syphilitic aneurysm strongly, because preoperative serodiagnostic test was concluded to be positive. However, histological examination did not show typical syphilitic features. The patient remains asymptomatic 1 year later. Although extremely rarely today, syphilitic aneurysm should be still considered in the differential diagnosis of ascending aortic aneurysm. PMID:24000069

  9. Bilateral adrenal cystic neuroblastoma with superior vena cava syndrome and massive intracystic haemorrhage

    International Nuclear Information System (INIS)

    Bilateral cystic adrenal tumours are a rare presentation of neuroblastoma. Intratumoural haemorrhage is a frequent finding in neuroblastoma, but is rarely symptomatic. We present an 11-month-old girl with predominantly cystic bilateral neuroblastomas and distant lymph-node metastasis. Massive intracystic haemorrhage and superior vena cava (SVC) syndrome were ominous prognostic factors, leading to death. Large tumours with intracystic haemorrhage might require a conservative approach. (orig.)

  10. Superior vena cava syndrome associated with right-to left shunt through systemic-to-pulmonary venous collaterals

    International Nuclear Information System (INIS)

    Superior vena cava (SVC) obstruction is associated with the gradual development of venous collaterals. We present a rare form of systemic-to-pulmonary subpleural collateral pathway that developed in the bridging subpleural pulmonary veins in a 54-year-old woman with complete SVC obstruction. This uncommon collateral pathway represents a rare form of acquired right-to-left shunt due to previous pleural adhesions with an increased risk of stroke due to right-to-left venous shunting, which requires lifelong anticoagulation.

  11. Medical image of the week: persistent left superior vena cava

    Directory of Open Access Journals (Sweden)

    Hammode E

    2014-10-01

    Full Text Available No abstract available. Article truncated after 150 words. A 19 year old man with acute lymphocytic leukemia was admitted to the ICU with septic shock. Due to areas of cellulitis on the right side of the chest and neck and femoral venous thrombi, a left subclavian central access was attempted. The chest x-ray obtained after line placement is shown below (Figure 1. Blood gas done from the line was consistent with venous blood and venous tranduction was seen. A CT of the chest (Figure 2 confirmed the diagnosis of persistent left superior vena cava (PLSVC. A persistent left superior vena cava is the most common congenital thoracic venous anomaly, seen in 0.3-0.5% of the population (1. Incidence is increased in patients with congenital heart disease to 5%. In most patients a right sided SVC is also present; hence the term SVC duplication has also been used. Embryologically a PLSVC is formed when the left anterior cardinal vein is ...

  12. Covered stent placement for the treatment of malignant superior vena cava syndrome: Is unilateral covered stenting and effective?

    Energy Technology Data Exchange (ETDEWEB)

    Cho, Young Hoon; Gwon, Dong Il; Ko, Gi Young; Ko, Heung Kyu; Kim, Jin Hyoung; Shin, Ji Hoon; Yoon, Hyun Ki; Sung, Kyu Bo [Dept. of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Seoul (Korea, Republic of)

    2014-02-15

    To evaluate the safety and efficacy of unilateral covered stent placement in patients with malignant superior vena cava (SVC) syndrome. Between October 2008 and November 2012, expanded polytetrafluoroethylene-covered stent placement for malignant SVC syndrome was performed in 40 consecutive patients (35 men and five women; mean age, 61.4 years; range, 35-81 years). All covered stents were unilaterally placed within the SVC or across the venous confluence when needed to relieve venous obstruction and prevent tumor overgrowth, regardless of patency of contralateral brachiocephalic veins. Stent placement was technically successful in all patients. There were no major complications. Of the 37 patients symptomatic prior to stent placement, 34 (92%) experienced complete symptomatic relief 1-8 days after stent placement. Of the 29 patients who underwent covered stent placement across the venous confluence, nine patients had patent contralateral brachiocephalic veins prior to stent placement. However, no sign of SVC obstruction or contralateral upper extremity venous thrombosis was observed during the follow-up period. Kaplan-Meier analysis revealed median patient survival of 163 days. Stent occlusion occurred in four (10%) of 40 patents. Cumulative stent patency rates at 1, 3, 6, and 12 months were 95%, 92%, 86%, and 86%, respectively. Unilateral covered stent placement appears to be a safe and effective method for treating malignant SVC syndrome, despite the location of SVC occlusion.

  13. Covered stent placement for the treatment of malignant superior vena cava syndrome: Is unilateral covered stenting and effective?

    International Nuclear Information System (INIS)

    To evaluate the safety and efficacy of unilateral covered stent placement in patients with malignant superior vena cava (SVC) syndrome. Between October 2008 and November 2012, expanded polytetrafluoroethylene-covered stent placement for malignant SVC syndrome was performed in 40 consecutive patients (35 men and five women; mean age, 61.4 years; range, 35-81 years). All covered stents were unilaterally placed within the SVC or across the venous confluence when needed to relieve venous obstruction and prevent tumor overgrowth, regardless of patency of contralateral brachiocephalic veins. Stent placement was technically successful in all patients. There were no major complications. Of the 37 patients symptomatic prior to stent placement, 34 (92%) experienced complete symptomatic relief 1-8 days after stent placement. Of the 29 patients who underwent covered stent placement across the venous confluence, nine patients had patent contralateral brachiocephalic veins prior to stent placement. However, no sign of SVC obstruction or contralateral upper extremity venous thrombosis was observed during the follow-up period. Kaplan-Meier analysis revealed median patient survival of 163 days. Stent occlusion occurred in four (10%) of 40 patents. Cumulative stent patency rates at 1, 3, 6, and 12 months were 95%, 92%, 86%, and 86%, respectively. Unilateral covered stent placement appears to be a safe and effective method for treating malignant SVC syndrome, despite the location of SVC occlusion.

  14. SVC PSCAD model validation testing in Manitoba

    Energy Technology Data Exchange (ETDEWEB)

    Kell, D. [TransGrid Solutions, Winnipeg, MB (Canada); Jacobson, D. [Manitoba Hydro, Winnipeg, MB (Canada); Oheidhin, G. [Areva T and D, Staffordshire (United Kingdom)

    2007-07-01

    The paper described some of the main technical aspects of the commissioning of the Ponton static var compensator (SVC) to Manitoba Hydro's electrical system. Off-line simulations were performed to gain confidence in the system tests and to deliver a validated EMT-type model. The peak load of Manitoba Hydro is approximately 4200 MW with an installed generating capacity of 5700 MW. Approximately 70 per cent of the power is generated from 3 hydraulic stations on the Nelson River in northern Manitoba. This power is transmitted for 900 km via the Nelson River high voltage direct current (HVDC) transmission to the Dorsey switching station near the major load centre of Winnipeg. The AC system is interconnected with Saskatchewan to the west with four 230 kV AC lines, and with Ontario to the east by two 230 kV AC lines. There are three 230 kV and one 500 kV AC inter-ties between Manitoba Hydro and the power system in the United States. One 230 kV line travels south from the northern generators and inter-connects into the Ponton busbar where an SVC with a supplementary damping controller was recently installed to improve system stability. 7 figs.

  15. Reactive current control through SVC for load power factor correction

    Energy Technology Data Exchange (ETDEWEB)

    Kodsi, Sameh K.M.; Canizares, Claudio A.; Kazerani, Mehrdad [University of Waterloo, Department of Electrical & amp; Computer Engineering, Waterloo, Ont. (Canada N2L 3G1)

    2006-06-15

    This paper discusses a new technique for controlling SVCs (Fixed Capacitor-Thyristor Controlled Reactor) in power systems with the aim of canceling the reactive current component of the load. A complete model of the SVC with its control circuit is set up and simulated in the EMTDC program. The generated harmonics from the proposed SVC controller are considered to design simple tuned filters to cancel the undesirable harmonic components. The effect of these filters is considered as well in the SVC control design, so that the reactive current component absorbed by the combination of the load, SVC, and filters is eliminated. The proposed control technique is compared with respect to a standard PI-based SVC controller. (author)

  16. Real-time phase-contrast flow MRI of haemodynamic changes in the ascending aorta and superior vena cava during Mueller manoeuvre

    International Nuclear Information System (INIS)

    Aim: To evaluate the potential of real-time phase-contrast flow magnetic resonance imaging (MRI) at 40 ms resolution for the simultaneous determination of blood flow in the ascending aorta (AA) and superior vena cava (SVC) in response to reduced intrathoracic pressure (Mueller manoeuvre). Materials and methods: Through-plane flow was assessed in 20 healthy young subjects using real-time phase-contrast MRI based on highly undersampled radial fast low-angle shot (FLASH) with image reconstruction by regularized non-linear inversion. Haemodynamic alterations (three repetitions per subject = 60 events) were evaluated during normal breathing (10 s), inhalation with nearly closed epiglottis (10 s), and recovery (20 s). Results: Relative to normal breathing and despite interindividual differences, reduced intrathoracic pressure by at least 30 mmHg significantly decreased the initial peak mean velocity (averaged across the lumen) in the AA by −24 ± 9% and increased the velocity in the SVC by +28 ± 25% (p < 0.0001, n = 23 successful events). Respective changes in flow volume per heartbeat were −25 ± 9% in the AA and +49 ± 44% in the SVC (p < 0.0001, n = 23). Flow parameters returned to baseline during sustained pressure reduction, while the heart rate was elevated by 10% (p < 0.0001) after the start (n = 24) and end (n = 17) of the manoeuvre. Conclusions: Real-time flow MRI during low intrathoracic pressure non-invasively revealed quantitative haemodynamic adjustments in both the AA and SVC. - Highlights: • Direct monitoring of rapid haemodynamic adjustments can be achieved using real-time phase contrast MRI. • This technique allows for the simultaneous measurement of blood flow in multiple vessels. • It may improve our understanding of the cardiovascular consequences of sleep apnoea

  17. Massive catheter-related thrombosis of vena cava superior protruding into the right atrium in a hemodialysis patient.

    Science.gov (United States)

    Mach, Lukas; Ondruskova, Olga; Nemec, Petr; Orban, Marek

    2015-10-01

    A 36-year-old man with chronic renal insufficiency secondary to type 1 diabetes mellitus was on hemodialysis via central venous catheter (CVC), newly placed into the right subclavian vein after his arteriovenous fistula became dysfunctional. Seven days after CVC insertion, the patient developed fever and on day 11 echocardiography showed a large nearly occluding thrombus in the superior vena cava (SVC) extending into the right atrium (RA). Emergency surgical thrombectomy was successfully performed and an 11 cm long thrombus extending from the RA cranially into the SVC occupying majority of the vein's lumen was removed. Cultures from the thrombus and CVC were negative, but polymerase chain reaction was positive for Staphylococcus aureus. This particular case was interesting for a marked discrepancy between large SVC occluding thrombosis and a relatively mild clinical presentation with fever, and it highlights the importance of correct timing of echocardiography exam which might prevent potentially fatal consequences such as pulmonary embolism. PMID:25645521

  18. Angiosarcoma of the superior vena cava

    International Nuclear Information System (INIS)

    The first reported case of an angiosarcoma apparently arising from the superior vena cava is presented. The patient, a 20-year-old white man, was treated by surgical excision and reconstruction with dacron grafts from the left and right brachiocephalic veins to the right atrium. This was followed by a course of mediastinal irradiation. The patient remained clinically disease-free at 24 months post-treatment. The patient had occasional occupational exposure to polyvinyl chloride

  19. Angiosarcoma of the superior vena cava

    Energy Technology Data Exchange (ETDEWEB)

    Abratt, R.P.; Williams, M.; Raff, M.; Dodd, N.F.; Uys, C.J.

    1983-08-15

    The first reported case of an angiosarcoma apparently arising from the superior vena cava is presented. The patient, a 20-year-old white man, was treated by surgical excision and reconstruction with dacron grafts from the left and right brachiocephalic veins to the right atrium. This was followed by a course of mediastinal irradiation. The patient remained clinically disease-free at 24 months post-treatment. The patient had occasional occupational exposure to polyvinyl chloride.

  20. Electrophysiological characteristics of paroxysmal atrial fibrillation originating from superior vena cava: a clinical analysis of 30 cases.

    Science.gov (United States)

    Shi, Xiang-Min; Yuan, Hong-Tao; Guo, Hong-Yang; Guo, Jian-Ping; Shan, Zhao-Liang; Wang, Yu-Tang

    2015-01-01

    To analyze characteristics of electrocardiogram (ECG), electrophysiological intracardiac mapping and radiofrequency ablation (RF) of paroxysmal atrial fibrillation (PAF) originating from superior vena cava (SVC), aiming to investigate electrophysiological characteristics of PAF with SVC origin. Clinical data of 30 subjects (18 men and 12 women, aged, 58.6 ± 15.5 years) with PAF of SVC origin were retrospectively analyzed; All patients underwent RF during 2006.9-2012.7. ECG of AF and atrial premature contractions (APCs), procedure and fluoroscopic time, numbers of ablation sites within SVC, complications and success rate were studied. Compared with P wave of sinus rhythm (SR), APCs of SVC origin exhibited higher amplitude in lead II (0.23 ± 0.11 vs. 0.15 ± 0.06 mv), III (0.19 ± 0.09 vs. 0.13 ± 0.08 mv), AVF (0.21 ± 0.13 vs. 0.14 ± 0.10 mv), V2 (0.24 ± 0.07 vs. 0.15 ± 0.09 mv) and V3 (0.21 ± 0.09 vs. 0.12 ± 0.05 mv) (P atrial flutter within 1 month after completion of ablation and were controlled by antiarrhythmic drugs. The APCs and AF of SVC origin manifested distinctive ECG features, which could be helpful to distinguish SVC from other foci before ablation, the completion of SVCI required shorter procedure and fluoroscopic time, as well as less ablation points, and meanwhile, the success rate was high with less complication. PMID:25784993

  1. Networked Software’ Performance Metrics and Analysis with IBM SVC Config Advisor

    OpenAIRE

    Mr. Kushal S. Patel; Prof. S.A. Shinde

    2014-01-01

    IBM SVC is a virtualization product by IBM which deals with storage virtualization. In this IBM SVC, numbers of hetrogenous hosts are connected by means of high speed communication network. To manage configuration of these networked component is very difficult task. To automate this configuration checking is need of the world. Hence IBM SVC Config Advisor tool is developed by IBM. This tool deals with remote configuration check for storage stand including IBM SVC and Storwize products. This p...

  2. Creating a Fontan fenestration in a child with dextrocardia and interrupted inferior vena cava

    Directory of Open Access Journals (Sweden)

    Pradeepkumar Charlagorla

    2016-01-01

    Full Text Available Plastic bronchitis is a rare life-threatening complication of the Fontan operation. Transcatheter Fontan fenestration can ameliorate symptoms by decompressing elevated venous pressures. Transcatheter creation of a fenestration can be technically challenging in cases with complex venous anatomy. We report a case of a 5-year-old boy with heterotaxy, dextrocardia with unbalanced atrioventricular canal (AVC, atrial and visceral situs inversus, left-sided superior vena cava (SVC, and left-sided interrupted inferior vena cava (IVC with azygos continuation. With few modifications to the equipment, a successful Fontan fenestration with stent implantation was performed via transjugular approach. At 2-year follow-up, his symptoms of plastic bronchitis improved significantly.

  3. Suction against resistance: a new breathing technique to significantly improve the blood flow ratio of the superior and inferior vena cava

    International Nuclear Information System (INIS)

    Optimal contrast within the pulmonary artery is achieved by the maximum amount of contrast-enhanced blood flowing through the superior vena cava (SVC), while minimum amounts of non-contrasted blood should originate from the inferior vena cava (IVC). This study aims to clarify whether ''suction against resistance'' might optimise this ratio. Phase-contrast pulse sequences on a 1.5T MRI magnet were used for flow quantification mean flow (mL/s), stroke volume (Vol) in the SVC and IVC in volunteers. Different breathing manoeuvers were analysed repeatedly: free breathing; inspiration; expiration; suction against resistance, and Valsalva. To standardise breathing commands, volunteers performed suction and Valsalva manoeuvers with an MR-compatible manometer.??Suction against resistance was associated with a significant drop of the IVC/SVC flow quotient (1.63 [range 1.3-2.0] p 0.05).??Suction against resistance caused a significant drop in the IVC/SVC quotient. Theoretically, this breathing manoeuver might significantly improve the enhancement characteristics of CT angiography. (orig.)

  4. Cerebral tissue oxygenation index and superior vena cava blood flow in the very low birth weight infant.

    LENUS (Irish Health Repository)

    Moran, M

    2012-02-01

    BACKGROUND: Superior vena cava (SVC) flow assesses blood flow from the upper body, including the brain. Near infrared spectroscopy (NIRS) provides information on brain perfusion and oxygenation. AIM: To assess the relationship between cerebral tissue oxygenation index (cTOI) and cardiac output measures in the very low birth weight (VLBW) infant in the first day of life. METHODS: A prospective observational cohort study. Neonates with birth weight less than 1500 g (VLBW) were eligible for enrollment. Newborns with congenital heart disease, major congenital malformations and greater than Papile grade1 Intraventricular Haemorrhage on day 1 of life were excluded. Echocardiographic evaluation of SVC flow was performed in the first 24 h of life. Low SVC flow states were defined as a flow less than 40 mL\\/kg\\/min. cTOI was measured using NIRO 200 Hamamatsu. RESULTS: Twenty-seven VLBW neonates had both echocardiography and NIRS performed. The median (range) gestation was 29\\/40 (25 + 3 to 31 + 5 weeks) and median birth weight was 1.2 kg (0.57-1.48 kg). The mean (SD) TOI was 68.1 (7.9)%. The mean (SD) SVC flow was 70.36(39.5) mLs\\/kg\\/min. The correlation coefficient of cerebral tissue oxygenation and SVC flow was r = 0.53, p-value 0.005. There was a poor correlation between right and left ventricular output and cTOI which is not surprising considering the influence of intra- and extracardiac shunts. CONCLUSION: There is a positive relationship between cerebral TOI values and SVC flow in the very low birth infant on day one of life.

  5. Primary lung lymphoma involving the superior vena cava

    Directory of Open Access Journals (Sweden)

    Wei Sen

    2012-06-01

    Full Text Available Abstract Primary lung lymphoma (PLL presenting as a primary pulmonary lesion is rare and usually affects elderly people. Here we describe a 25-year-old Chinese man diagnosed with primary lung lymphoma, which presented as a huge lung tumor mimicking a primary lung cancer and involving the superior vena cava. He underwent double-sleeve reconstructions of bronchus and pulmonary arteries with right upper- and middle-lobe lobectomy along with replacement of the superior vena cava with a graft, and was then given standard chemotherapy of CHOP plus Rituximab. The patient has been well, showing no local recurrence or distal metastasis during a 27-month follow-up.

  6. H.264 SVC Complexity Reduction Based on Likelihood Mode Decision.

    Science.gov (United States)

    Balaji, L; Thyagharajan, K K

    2015-01-01

    H.264 Advanced Video Coding (AVC) was prolonged to Scalable Video Coding (SVC). SVC executes in different electronics gadgets such as personal computer, HDTV, SDTV, IPTV, and full-HDTV in which user demands various scaling of the same content. The various scaling is resolution, frame rate, quality, heterogeneous networks, bandwidth, and so forth. Scaling consumes more encoding time and computational complexity during mode selection. In this paper, to reduce encoding time and computational complexity, a fast mode decision algorithm based on likelihood mode decision (LMD) is proposed. LMD is evaluated in both temporal and spatial scaling. From the results, we conclude that LMD performs well, when compared to the previous fast mode decision algorithms. The comparison parameters are time, PSNR, and bit rate. LMD achieve time saving of 66.65% with 0.05% detriment in PSNR and 0.17% increment in bit rate compared with the full search method. PMID:26221623

  7. H.264 SVC Complexity Reduction Based on Likelihood Mode Decision

    Science.gov (United States)

    Balaji, L.; Thyagharajan, K. K.

    2015-01-01

    H.264 Advanced Video Coding (AVC) was prolonged to Scalable Video Coding (SVC). SVC executes in different electronics gadgets such as personal computer, HDTV, SDTV, IPTV, and full-HDTV in which user demands various scaling of the same content. The various scaling is resolution, frame rate, quality, heterogeneous networks, bandwidth, and so forth. Scaling consumes more encoding time and computational complexity during mode selection. In this paper, to reduce encoding time and computational complexity, a fast mode decision algorithm based on likelihood mode decision (LMD) is proposed. LMD is evaluated in both temporal and spatial scaling. From the results, we conclude that LMD performs well, when compared to the previous fast mode decision algorithms. The comparison parameters are time, PSNR, and bit rate. LMD achieve time saving of 66.65% with 0.05% detriment in PSNR and 0.17% increment in bit rate compared with the full search method. PMID:26221623

  8. Artificial Intelligence SVC Based Control of Two Machine Transmission System

    OpenAIRE

    Reza Bayat; Hamed ahmadi

    2013-01-01

    The main target in this paper is to present, design fuzzy logic controller (FLC) applied to static var compensator (SVC) on two machine transmission system to improve transient stability and rapid damping oscillations of synchronous generators, when power generators sudden changes occur.stability that also played important role in power systems. static var compensator with fuzzy logic controller (SVCFLC) is a new control strategy can help improve transient stability.The effect of three phase...

  9. Adaptive live multicast video streaming of SVC with UEP FEC

    Science.gov (United States)

    Lev, Avram; Lasry, Amir; Loants, Maoz; Hadar, Ofer

    2014-09-01

    Ideally, video streaming systems should provide the best quality video a user's device can handle without compromising on downloading speed. In this article, an improved video transmission system is presented which dynamically enhances the video quality based on a user's current network state and repairs errors from data lost in the video transmission. The system incorporates three main components: Scalable Video Coding (SVC) with three layers, multicast based on Receiver Layered Multicast (RLM) and an UnEqual Forward Error Correction (FEC) algorithm. The SVC provides an efficient method for providing different levels of video quality, stored as enhancement layers. In the presented system, a proportional-integral-derivative (PID) controller was implemented to dynamically adjust the video quality, adding or subtracting quality layers as appropriate. In addition, an FEC algorithm was added to compensate for data lost in transmission. A two dimensional FEC was used. The FEC algorithm came from the Pro MPEG code of practice #3 release 2. Several bit errors scenarios were tested (step function, cosine wave) with different bandwidth size and error values were simulated. The suggested scheme which includes SVC video encoding with 3 layers over IP Multicast with Unequal FEC algorithm was investigated under different channel conditions, variable bandwidths and different bit error rates. The results indicate improvement of the video quality in terms of PSNR over previous transmission schemes.

  10. Artificial Intelligence SVC Based Control of Two Machine Transmission System

    Directory of Open Access Journals (Sweden)

    Reza Bayat

    2013-07-01

    Full Text Available The main target in this paper is to present, design fuzzy logic controller (FLC applied to static var compensator (SVC on two machine transmission system to improve transient stability and rapid damping oscillations of synchronous generators, when power generators sudden changes occur.stability that also played important role in power systems. static var compensator with fuzzy logic controller (SVCFLC is a new control strategy can help improve transient stability.The effect of three phase fault causes instability on power system. By and large, it is very difficult to control machine speeds ,rotor angle and voltage during three-phase fault.SVCFLC is a voltage stablizer using three static var compensator which are controlled by SVC with fuzzy logic controller(FLC.The FLC is an effective device for transient stability of two-mashine transmission system. The nonlinear model dynamic formulation problem in unstable system can be solved by using artificial intelligence theorem. Fuzzy logic theory is used to improve the system stability . simulation results of three-phase fault in power system show that SVCFLC caused to increase the stability and damp out the oscillation of machine, compared with effective of SVC in the presence of power system stabilizer(PSS.

  11. Networked Software’ Performance Metrics and Analysis with IBM SVC Config Advisor

    Directory of Open Access Journals (Sweden)

    Mr. Kushal S. Patel

    2014-06-01

    Full Text Available IBM SVC is a virtualization product by IBM which deals with storage virtualization. In this IBM SVC, numbers of hetrogenous hosts are connected by means of high speed communication network. To manage configuration of these networked component is very difficult task. To automate this configuration checking is need of the world. Hence IBM SVC Config Advisor tool is developed by IBM. This tool deals with remote configuration check for storage stand including IBM SVC and Storwize products. This paper introduces the IBM SVC Config Advisor tool along with performance statistics. This paper mainly deals with the networked tool’s performance statistics collection and analysis. Here IBM SVC Config Advisor is used as networked Tool for analysis. This paper can be useful to analyze software which are highly network dependent in nature.

  12. Mode decision acceleration for H.264/AVC to SVC temporal video transcoding

    Science.gov (United States)

    Yeh, Chia-Hung; Tseng, Wen-Yu; Wu, Shih-Tse

    2012-12-01

    This study presents a fast video transcoding architecture that overcomes the complexity of different coding structures between H.264/AVC and SVC. The proposed algorithms simplify the mode decision process in SVC owing to its heavy computations. Two scenarios namely transcoding with the same quantization parameter and bitrate reduction are considered. In the first scenario, SVC's modes are determined by the probability models, including conditional probability, Bayesian theorem, and Markov chain. The second scenario measures MB activity to determine SVC's modes. Experimental results indicate that our algorithm saves significant coding time with negligible PSNR loss over that when using a cascaded pixel-domain transcoder.

  13. Temporal scalability comparison of the H.264/SVC and distributed video codec

    DEFF Research Database (Denmark)

    Huang, Xin; Ukhanova, Ann; Belyaev, E.; Forchhammer, Søren

    The problem of the multimedia scalable video streaming is a current topic of interest. There exist many methods for scalable video coding. This paper is focused on the scalable extension of H.264/AVC (H.264/SVC) and distributed video coding (DVC). The paper presents an efficiency comparison of SVC...

  14. Improving P2P live-content delivery using SVC

    Science.gov (United States)

    Schierl, T.; Sánchez, Y.; Hellge, C.; Wiegand, T.

    2010-07-01

    P2P content delivery techniques for video transmission have become of high interest in the last years. With the involvement of client into the delivery process, P2P approaches can significantly reduce the load and cost on servers, especially for popular services. However, previous studies have already pointed out the unreliability of P2P-based live streaming approaches due to peer churn, where peers may ungracefully leave the P2P infrastructure, typically an overlay networks. Peers ungracefully leaving the system cause connection losses in the overlay, which require repair operations. During such repair operations, which typically take a few roundtrip times, no data is received from the lost connection. While taking low delay for fast-channel tune-in into account as a key feature for broadcast-like streaming applications, the P2P live streaming approach can only rely on a certain media pre-buffer during such repair operations. In this paper, multi-tree based Application Layer Multicast as a P2P overlay technique for live streaming is considered. The use of Flow Forwarding (FF), a.k.a. Retransmission, or Forward Error Correction (FEC) in combination with Scalable video Coding (SVC) for concealment during overlay repair operations is shown. Furthermore the benefits of using SVC over the use of AVC single layer transmission are presented.

  15. Analysis of Doppler flow spectra of the superior vena cava in a canine model of acute thromboembolic pulmonary hypertension.

    Science.gov (United States)

    Sun, Dan Dan; Chen, Hong Mao; Duan, Yun You; Yuan, Li Jun; Shang, Fu Jun; Liang, Ning Nan; Cao, Wei

    2011-10-01

    We aimed to establish a canine model of acute thromboembolic pulmonary hypertension (ATEPH) and to explore the feasibility of diagnosing pulmonary hypertension (PH) through the Doppler flow spectra of the superior vena cava (SVC). A canine model of ATEPH was developed by infusing thrombus into the right femoral vein. The pulmonary arterial pressure was simultaneously measured via a right heart catheter with the guidance of ultrasound. The maximum systolic peak flow velocity (SPV), ventricular reverse peak flow velocity (VRPV), diastolic peak flow velocity (DPV), and atrial reverse peak flow velocity (ARPV) of the SVC were measured by transthoracic echocardiography. ATEPH was successfully established in 24 dogs (88.9%) with the pulmonary arterial systolic pressure (PASP) greater than 30 mmHg. ARPV increased significantly with the increase of PASP, and was positively correlated with PASP (PSPV larger than 0.8 could be better adopted to identify all the subjects with PH in this study. The Doppler flow spectra of the SVC could be employed to assess the severity of ATEPH.  PMID:21916968

  16. Coordinated Control of SVC and PSS for Transient Stability Enhancement of Multi-Machine Power System

    Directory of Open Access Journals (Sweden)

    Lin Xu

    2013-02-01

    Full Text Available The coordinated control for SVC and generic/multi-band PSS for power swing damping is presented for the multimachine power system. The background and the mathematical models of the generic PSS, the multi-band PSS and the SVC are presented. The V-I characteristics as well as the dynamic properties of the static var compensator (SVC are presented. The multi-machine power system is simulated using MATLAB and the effect of PSS and SVC on dynamic response of the system under single-phase fault and three-phase fault are simulated. The simulation results reveal that the coordinated control of the SVC and the generic/multi-band PSS is an effective solution to damp low frequency oscillation for multimachine power system and enhance global stability of the large inter-connected power system.

  17. Design of an H.264/SVC resilient watermarking scheme

    Science.gov (United States)

    Van Caenegem, Robrecht; Dooms, Ann; Barbarien, Joeri; Schelkens, Peter

    2010-01-01

    The rapid dissemination of media technologies has lead to an increase of unauthorized copying and distribution of digital media. Digital watermarking, i.e. embedding information in the multimedia signal in a robust and imperceptible manner, can tackle this problem. Recently, there has been a huge growth in the number of different terminals and connections that can be used to consume multimedia. To tackle the resulting distribution challenges, scalable coding is often employed. Scalable coding allows the adaptation of a single bit-stream to varying terminal and transmission characteristics. As a result of this evolution, watermarking techniques that are robust against scalable compression become essential in order to control illegal copying. In this paper, a watermarking technique resilient against scalable video compression using the state-of-the-art H.264/SVC codec is therefore proposed and evaluated.

  18. Mesothelioma with superior vena cava obstruction in young female following short latency of asbestos exposure

    Directory of Open Access Journals (Sweden)

    Anupam Patra

    2015-01-01

    Full Text Available An 18 years female was admitted with right-sided chest pain, dry cough, and low-grade fever and weight loss for last 1 month. On examination, patient had features of superior vena cava (SVC syndrome with right-sided pleural effusion. Chest X-ray showed mediastinal widening with nonhomogenous opacity mainly in the periphery of right upper and mid zone with right-sided pleural effusion. Ultrasonography thorax confirmed mild pleural effusion. Pleural fluid analysis showed lymphocytic, exudative, low adenosine deaminase with negative for Pap smear. Contrast-enhanced computed tomography (CT thorax revealed large extensive nodular soft tissue lesion along right mediastinum as well as costal pleura, with enlarged pretracheal lymphadenopathy and SVC obstruction. CT guided Tru-cut biopsy report came as malignant epithelial tumor with polygonal shape, abundant eosinophilic cytoplasm and nuclei with prominent nucleoli suggestive of mesothelioma of epithelioid type. The tumor cell expressed calretinin, WT-1, and immunonegative for thyroid transcription factor-1.

  19. Síndrome de veia cava superior Superior vena cava syndrome

    Directory of Open Access Journals (Sweden)

    SAMUEL ZUÍNGLIO DE BIASI CORDEIRO

    2002-09-01

    Full Text Available A obstrução ao fluxo sanguíneo na VCS e suas manifestações clínicas têm hoje como causa principal o câncer de pulmão. A história relata que no século XVIII a sífilis e a tuberculose eram responsáveis por 40% dos casos conhecidos. O conhecimento das alterações hemodinâmicas compreendidas nesta síndrome assim como a apuração das técnicas de diagnóstico de imagem e de citopatologia permitem hoje que o médico possa tratar de seu paciente com mais segurança e conforto do que há 10 anos. A TC contrastada e a RM auxiliam no diagnóstico de localização da obstrução e técnicas mais antigas como a cavografia puderam ser abandonadas. O diagnóstico de obstrução da VCS e o estudo por Doppler realizado à beira do leito em muito contribuem para a realização de procedimentos de desobstrução como a angioplastia transluminal percutânea nos casos de trombose ou estenose do vaso. Também a utilização de próteses como PTFE é de importância fundamental na condução de casos de lesão traumática da VCS durante cirurgias para câncer pulmonar ou mediastinal. No campo da radioterapia, a técnica de fracionamento permite que altas doses de irradiação sejam administradas aos pacientes portadores de neoplasias malignas, com benefícios em 70% dos casos.Lung cancer is now the main cause of blood flow obstruction in the superior vena cava and of its clinical manifestations. History tells that in the 18th Century, syphilis and tuberculosis were responsible for 40% of the known cases. The knowledge of hemodynamic changes seen in this syndrome and the improvement of diagnostic and cytopathologic techniques allow for a safer and more comfortable treatment of the patient than 10 years ago. Contrast CT and MR added to the identification and location of the obstruction, and older techniques such as cavography could be abandoned. SVC obstruction diagnosis and Doppler studies carried out at the bed of the patient contribute to

  20. Transient Stability Enhancement in Power System Using Static VAR Compensator (SVC

    Directory of Open Access Journals (Sweden)

    Youssef MOULOUDI

    2012-12-01

    Full Text Available In this paper, an indirect adaptive fuzzy excitation and static VAR (unit of reactive power, volt-ampere reactive compensator (SVC controller is proposed to enhance transient stability for the power system, which based on input-output linearization technique. A three-bus system, which contains a generator and static VAR compensator (SVC, is considered in this paper, the SVC is located at the midpoint of the transmission lines. Simulation results show that the proposed controller compared with a controller based on tradition linearization technique can enhance the transient stability of the power system under a large sudden fault, which may occur nearly at the generator bus terminal.

  1. Design of power control system using SMES and SVC for fusion power plant

    Energy Technology Data Exchange (ETDEWEB)

    Niiyama, K; Yagai, T; Tsuda, M; Hamajima, T [Graduate school of Engineering, Tohoku University, Sendai (Japan)], E-mail: kniiyama@ecei.tohoku.ac.jp

    2008-02-15

    A SMES (Superconducting Magnetic Energy Storage System) system with converter composed of self-commutated valve devices such as GTO and IGBT is available to control active and reactive power simultaneously. A SVC (Static Var Compensators) or STATCOM (Static Synchronous Compensator) is widely employed to reduce reactive power in power plants and substations. Owing to progress of power electronics technology using GTO and IGBT devices, power converters in the SMES system and the SVC can easily control power flow in few milliseconds. Moreover, since the valve devices for the SMES are equivalent to those for the SVC, the device cost must be reduced. In this paper the basic control system combined with the SMES and SVC is designed for large pulsed loads of a nuclear fusion power plant. This combined system largely expands the reactive power control region as well as the active one. The simulation results show that the combined system is effective and prospective for the nuclear fusion power plant.

  2. The coordinated control of SVC and excitation of generators Using Adaptive Fuzzy Control

    OpenAIRE

    Berbaoui Brahim; Bousmaha Bouchiba,; Youssef Mouloudi,; Abdellah Laoufi

    2011-01-01

    Based on the feedback linearized technique and control of differential and algebraic systems, the Indirect Adaptive fuzzy excitation control is presented in this paper for SVC (static var compensator) and generator excitation controllers in power systems with nonlinear loads. It can improve both the power angle stability ofgenerators and the voltage behavior at the SVC location. Simulation results shown that the proposed controller IAFLC, compared with a controller based on tradition lineariz...

  3. Persistent left superior vena cava draining to the left atrium: A case report and review of the literature

    International Nuclear Information System (INIS)

    Persistent left superior vena cava is a rare but important congenital vascular anomaly. However, PLSVC with absent RSVC (isolated PLSVC) is a very rare venous malformation We report on a rare case of persistent left superior vena cava (PLSVC) with absent right superior vena cava (RSVC). This venous malformation was identified incidentally in a 69-year-old woman during chest multi-detector computed tomography (MDCT). On chest MDCT, the SVC was noted on the left side. A bridging vein drained the right jugular and right subclavian veins and joined the left brachiocephalic vein in order to form the PLSVC, which descended on the left side of the mediastinum and drained into the left atrium (LA). The patient had no additional cardiac anomaly. Isolated PLSVC is usually asymptomatic but it can pose difficulties for establishing central venous access, pacemaker implantation and cardiothoracic surgery. This condition is also associated with an increased incidence of congenital heart disease, arrhythmias and conduction disturbances. A wide spectrum of clinicians should be aware of this anomaly, its variations and possible complications

  4. Malignant thrombosis of the superior vena cava caused by non-small-cell lung cancer treated with radiation and erlotinib: a case with complete and prolonged response over 3 years

    Directory of Open Access Journals (Sweden)

    Wang JY

    2013-07-01

    Full Text Available Jianyang Wang,1 Jun Liang,1 Wenqing Wang,1 Han Ouyang,2 Luhua Wang11Department of Radiation Oncology, Cancer Hospital and Institute, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 2Department of Diagnostic Radiology, Cancer Hospital and Institute, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, People's Republic of ChinaAbstract: Most cases of superior vena cava (SVC syndrome resulting from neoplasm, especially from lung cancer, remain a serious challenge to treat. Here, for the first time as far as we are aware, we report the case of a non-small-cell lung cancer patient with a massive SVC malignant thrombosis who was treated with thoracic irradiation and erlotinib. The treatment regimen consisted of erlotinib 150 mg/day and a total dose of 66 Gy/33 fractions delivered to the tumor, malignant thrombosis, and metastasis mediastinal lymph nodes. The malignant thrombosis responded dramatically and the combined regimen was well tolerated. After discharge, the erlotinib was prescribed as maintenance therapy. The patient was followed closely for the next 3 years. During this time, positron emission tomography/computed tomography scans and serum tumor marker screens were undertaken. By 6 months, the primary tumor showed complete response and by 9 months, the SVC thrombosis had disappeared. No sign of relapse has been found to date.Keywords: superior vena cava syndrome, radiotherapy, thoracic irradiation, neoplasm

  5. A Gait Recognition System using GA-based C-SVC and Plantar Pressure

    Directory of Open Access Journals (Sweden)

    Yanbei Li

    2013-10-01

    Full Text Available In order to conduct the gait recognition system, a wireless in-shoe wearable plantar pressure acquisition system based on ATmega16 and 8 FSR sensors was applied to data acquisition for the gaits which consist of standing, walking, jumping and going upstairs. And four volunteers (2 females and 2 males were invited in this research to collect the pressure information. MATLAB and LIBSVM were applied to conduct all algorithms proposed by this study. Genetic Algorithm (GA was used to set the best tuning (penalty parameter  and the best  (gamma of Gauss radial basis kernel (RBF for C-support vector classification (C-SVC model and the GA-based C-SVC was obtained. A dataset named ‘train-data’, containing 800 sets of pressure data was used to train the GA-based C-SVC as the algorithm of gait recognition. Finally a testing dataset containing 400 sets of pressure data was applied to test the algorithm of gait recognition called GA-based C-SVC. The accuracy of this GA-based C-SVC was 98% for standing, 91% for walking, 82% for going-upstairs and 97% for jumping. In generally speaking, a better GA-based C-SVC was obtained in this research.

  6. A simplified rate control algorithm for H.264/SVC

    Science.gov (United States)

    Zhang, Guang Y.; Abdelazim, Abdelrahman; Mein, Stephen J.; Varley, Martin R.; Ait-Boudaoud, Djamel

    2011-06-01

    The objective of scalable video coding is to enable the generation of a unique bitstream that can adapt to various bitrates, transmission channels and display capabilities. The scalability is categorised in terms of temporal, spatial, and quality. Effective Rate Control (RC) has important ramifications for coding efficiency, and also channel bandwidth and buffer constraints in real-time communication. The main target of RC is to reduce the disparity between the actual and target bit-rates. In order to meet the target bitrate, a predicted Mean of Absolute Difference (MAD) between frames is used in a rate-quantisation model to obtain the Quantisation Parameter (QP) for encoding the current frame. The encoding process exploits the interdependencies between video frames; therefore the MAD does not change abruptly unless the scene changes significantly. After the scene change, the MAD will maintain a stable slow increase or decrease. Based on this observation, we developed a simplified RC algorithm. The scheme is divided in two steps; firstly, we predict scene changes, secondly, in order to suppress the visual quality, we limit the change in QP value between two frames to an adaptive range. This limits the need to use the rate-quantisation model to those situations where the scene changes significantly. To assess the proposed algorithm, comprehensive experiments were conducted. The experimental results show that the proposed algorithm significantly reduces encoding time whilst maintaining similar rate distortion performance, compared to both the H.264/SVC reference software and recently reported work.

  7. Serum cortisol values, superior vena cava flow and illness severity scores in very low birth weight infants.

    LENUS (Irish Health Repository)

    Miletin, J

    2012-02-01

    OBJECTIVE: Recent evidence suggests that high cortisol concentrations are associated with increased morbidity and mortality in very low birth weight (VLBW) infants. Neonatal illness severity and mortality risk scores are reliable in predicting morbidity and mortality. The objectives were (i) to assess the correlation between serum cortisol levels and clinical assessment of multi-organ dysfunction\\/illness severity scores (CRIB II, SNAPPE-II and neonatal multiple organ dysfunction score (NEOMOD)) in first 24 h in VLBW infants and (ii) to assess the relationship between surrogates of end organ blood flow and serum cortisol levels. STUDY DESIGN: A prospective observational cohort study. Neonates with birth weight <1500 g were eligible for enrollment. Echocardiography evaluation of superior vena cava (SVC) flow was carried out in the first 24 h life. Cortisol levels were measured simultaneously and appropriate clinical scores were calculated. RESULT: A total of 54 VLBW neonates were enrolled following parental consent. Two patients were excluded because of congenital malformations. In 14 babies the cortisol value was not simultaneously obtained. The mean birth weight was 1.08 kg, mean gestational age was 27.8 weeks. There was a significant correlation between cortisol and NEOMOD score (P=0.006). There was no correlation between cortisol and CRIB II score (P=0.34), SVC flow (P=0.49) and mean arterial blood pressure respectively (P=0.35). CONCLUSION: There was no correlation between SVC flow and cortisol values or between cortisol and mean blood pressure values. There was a significant correlation between cortisol levels and neonatal organ dysfunction score evaluated suggesting that stressed VLBW infants do mount a cortisol response.

  8. Proton beam therapy for a patient with a giant thymic carcinoid tumor and severe superior vena cava syndrome

    Directory of Open Access Journals (Sweden)

    Kaori Sugawara

    2014-05-01

    Full Text Available Surgical resection is the first choice for treatment of a thymic carcinoid tumor and radiotherapy is often performed as adjuvant therapy. Here, we report a case of an unresectable and chemoresistant thymic carcinoid tumor that was treated successfully using standalone proton beam therapy (PBT. The patient was a 66-year-old woman in whom surgical resection of the tumor was impossible because of cardiac invasion. Therefore, chemotherapy was administered. However, the tumor grew to 15 cm in diameter and she developed severe superior vena cava (SVC syndrome. She was referred to our hospital and received PBT at a dose of 74 GyE in 37 fractions. PBT was conducted without severe early toxicities. After PBT, the tumor mildly shrunk to 13 cm in diameter and SVC syndrome almost disappeared. Subsequently, the tumor has continued to decrease in size slowly over the last 2 years and late toxicities have not been observed. Our experience with this case suggests that PBT may be effective for an unresectable thymic carcinoid tumor.

  9. Supervised Vicarious Calibration (SVC of Multi-Source Hyperspectral Remote-Sensing Data

    Directory of Open Access Journals (Sweden)

    Anna Brook

    2015-05-01

    Full Text Available Introduced in 2011, the supervised vicarious calibration (SVC approach is a promising approach to radiometric calibration and atmospheric correction of airborne hyperspectral (HRS data. This paper presents a comprehensive study by which the SVC method has been systematically examined and a complete protocol for its practical execution has been established—along with possible limitations encountered during the campaign. The technique was applied to multi-sourced HRS data in order to: (1 verify the at-sensor radiometric calibration and (2 obtain radiometric and atmospheric correction coefficients. Spanning two select study sites along the southeast coast of France, data were collected simultaneously by three airborne sensors (AisaDUAL, AHS and CASI-1500i aboard two aircrafts (CASA of National Institute for Aerospace Technology INTA ES and DORNIER 228 of NERC-ARSF Centre UK. The SVC ground calibration site was assembled along sand dunes near Montpellier and the thematic data were acquired from other areas in the south of France (Salon-de-Provence, Marseille, Avignon and Montpellier on 28 October 2010 between 12:00 and 16:00 UTC. The results of this study confirm that the SVC method enables reliable inspection and, if necessary, in-situ fine radiometric recalibration of airborne hyperspectral data. Independent of sensor or platform quality, the SVC approach allows users to improve at-sensor data to obtain more accurate physical units and subsequently improved reflectance information. Flight direction was found to be important, whereas the flight altitude posed very low impact. The numerous rules and major outcomes of this experiment enable a new standard of atmospherically corrected data based on better radiometric output. Future research should examine the potential of SVC to be applied to super-and-hyperspectral data obtained from on-orbit sensors.

  10. Voltage Stability Improvement of Grid Connected Wind Driven Induction Generator Using Svc

    Directory of Open Access Journals (Sweden)

    Ruchi Aggarwal

    2014-05-01

    Full Text Available Voltage stability is one of the major problem associated with wind power generating system which may be due to fluctuating nature of wind, heavy load, fault occurrence or insufficient reactive power supply. The wind power generating system most commonly employed with squirrel cage induction generator(SCIG that needs the support of an external device such as capacitor bank, FACTS devices etc. to support reactive power in order to remain connected with the grid during voltage dips. The voltage stability of a wind driven induction generator can be improved by using FACTS devices such as SVC, STATCOM.In this paper svc is used for voltage stability improvement.

  11. The coordinated control of SVC and excitation of generators Using Adaptive Fuzzy Control

    Directory of Open Access Journals (Sweden)

    Berbaoui Brahim

    2011-01-01

    Full Text Available Based on the feedback linearized technique and control of differential and algebraic systems, the Indirect Adaptive fuzzy excitation control is presented in this paper for SVC (static var compensator and generator excitation controllers in power systems with nonlinear loads. It can improve both the power angle stability ofgenerators and the voltage behavior at the SVC location. Simulation results shown that the proposed controller IAFLC, compared with a controller based on tradition linearization technique can enhance the transient stability of the power system. In addition, this system is used through the Algerian South-Western power system (SONELGAZ "Algerian electrical society" NAAMA city and BECHAR city.

  12. Traumatismos de veia cava inferior Inferior vena cava injuries

    Directory of Open Access Journals (Sweden)

    Cleinaldo de Almeida Costa

    2005-10-01

    Full Text Available OBJETIVO: Avaliar a incidência, o perfil clínico e as estratégias operatórias dos ferimentos de Veia Cava Inferior (VCI. MÉTODOS: Foram analisados retrospectivamente os prontuários de 76 doentes com ferimento de VCI atendidos nos dois prontossocorros de Manaus, no período de janeiro de 1997 a julho de 2002. Mecanismo de lesão, mortalidade, estado hemodinâmico, índice de trauma abdominal penetrante (PATI, achados intra-operatórios e conduta cirúrgica foram estudados. RESULTADOS: Quarenta e nove (65% doentes sofreram lesão por arma branca, 26 (34% por arma de fogo e um por traumatismo abdominal fechado. Quarenta e um (54% doentes sobreviveram. Quase todos chegaram acordados, entretanto 40% estavam hipotensos (pressão arterial sistólica BACKGROUND: Injuries of inferior vena cava (IVC require immediate and definitive action. Our objective is to evaluate the incidence, the clinical findings and the operative approach to IVC injuries. METHODS: We retrospectively studied 76 patients with IVC injuries treated in two Emergency Hospitals of Manaus, AM, Brazil, from January 1997 to July 2002. Mechanisms of injuries, mortality, hemodynamic status, penetrating abdominal trauma index (PATI, intraoperative findings and surgical approach were among assessed data. RESULTS: Fourty-nine patients (65% had stab wounds, 26 (34% gunshot wounds, and one had blunt abdominal trauma. Fourty-one (54% patients survived. Almost all patients entered the emergency room awake, although 40% were hypotensive (systolic blood pressure < 70 mmHg, and the penetrating abdominal trauma index average was above 40. At laparotomy, active retroperitoneal bleeding or an expanding retroperitoneal hematoma were detected in all cases. Caval injury was retro-hepatic in 21 patients, and infrahepatic in the other 55. The prevailing surgical approach was lateral repair in 65 patients. Atrial-caval shunting was tried in six patients, with only three survivals. CONCLUSIONS: We

  13. Relationship between encephalopathy and portal vein-vena cava shunt:Value of computed tomography during arterial portography

    Institute of Scientific and Technical Information of China (English)

    Qian Chu; Zhen Li; Su-Ming Zhang; Dao-Yu Hu; Ming Xiao

    2004-01-01

    AIM: To assess the value of computed tomography during arterial portography (CTAP) in portal vein-vena cava shunt,and analysis of the episode risk in encephalopathy.METHODS: Twenty-nine patients with portal-systemic encephalopathy due to portal hypertension were classified by West Haven method into grade Ⅰ(29 cases), gradeⅡ(16 cases), grade Ⅲ(10 cases), grade Ⅳ( 4 cases). All the patients were scanned by spiral-CT. Plane scans, artery phase and portal vein phase enhancement scans were performed, and the source images were thinly reconstructed to 1.25 mm. We reconstructed the celiac trunk, portal vein,inferior vena cava and their branches and subjected them to three-dimensional vessel analysis by volume rendering(VR) technique and multiplanar volume reconstruction(MPVR) technique. The blood vessel reconstruction technique was used to evaluate the scope and extent of portal vein-vena cava shunt, portal vein emboli and the fistula of hepatic artery- portal vein. The relationship between the episode risk of portal-systemic encephalopathy and the scope and extent of portal vein-vena cava shunt,portal vein emboli and fistula of hepatic artery- portal vein was studied.RESULTS: The three-dimensional vessel reconstruction technique of spiral-CT could display celiac trunk, portal vein,inferior vena cava and their branches at any planes and angles and the scope and extent of portal vein-vena cava shunt, portal vein emboli and the fistula of hepatic artery- portal vein. In twenty-nine patients with portal-systemic encephalopathy, grade Ⅰ accounted for 89.7% esophageal varices, 86.2% paragastric varices; grade Ⅱ accounted for68.75% cirsomphalos, 56.25% paraesophageal varices,62.5% retroperitoneal varices and 81.25% dilated azygos vein; grade Ⅲ accounted for 80% cirsomphalos, 60%paraesophageal varices, 70% retroperitoneal varices, 90%dilated azygos vein, and part of the patients in grades Ⅱand Ⅲ had portal vein emboli and fistula of hepatic arteryportal vein

  14. Superior vena caval syndrome caused by the tumor of the left hilum in a patient with unilateral persistent left superior vena cava diagnosed with multislice spiral computed tomography-a case report

    International Nuclear Information System (INIS)

    Unilateral persistent left superior vena cava (PLSVC) is an infrequent finding with incidence of 18-20% among the individuals with PLSVC. The persistence of the left-sided superior vena cava is an effect of disturbances in development of the connection between the precardinal veins (anterior cardinal veins) and formation of the sinus venosus in early stages of embryogenesis. The paper presents a case of a 62-year-old patient with a mass lesion of the left hilum, which caused left-sided superior vena caval syndrome in the presence of unilateral SVC. Developmental mechanisms of superior vena caval syndrome are discussed. The evolution of changes related to infiltration and occlusion of PLSVC is shown on the basis of three selected MSCT examinations. (author)

  15. Microgrid energy management in grid-connected and islanding modes based on SVC

    International Nuclear Information System (INIS)

    Highlights: • SVC is used to enhance the performance of a microgrid (MG). • MG performance is measured by some key performance indicators (KPIs). • KPIs comprise power loss, voltage deviation, power factor, THD and v/f deviation. • The microgrid is simulated in grid-connected and islanded modes. • Results show SVC stabilizes voltage, reduce losses and THD and enhance power factor. - Abstract: Microgrids are small scale energy grids that can provide adequate energy supply to cover regional demand by integrating renewable energy generation and storage technologies. This paper develops a high performance dynamic model of a microgrid system comprising a wind turbine, a PV, a fuel cell, a micro gas turbine generator, an energy storage, electric loads with variable load profile and flexible AC transmission system (FACTS) devices. The FACTS devices based on static VAR compensators have been employed as a supervisory controller. Key performance indicators such as microgrid power losses, buses voltage deviations, buses power factor, buses voltage total harmonic distortion and voltage-frequency deviation are used to evaluate the performance of this microgrid in grid-connected and islanding modes. The results obtained from the Matlab/Simulink environment show that the proposed microgrid design with SVC has the ability to meet its special requirements such as bus voltages stabilization, reduction of feeder losses, power factor enhancement and mitigation of total harmonic distortion using SVC in grid-connected and islanding modes

  16. Advanced Adaptive Particle Swarm Optimization based SVC Controller for Power System Stability

    Directory of Open Access Journals (Sweden)

    Poonam Singhal

    2014-12-01

    Full Text Available The interconnected systems is continually increasing in size and extending over whole geographical regions, it is becoming increasingly more difficult to maintain synchronism between various parts of the power system. This paper work presents an advanced adaptive Particle swarm optimization technique to optimize the SVC controller parameters for enhancement of the steady state stability & overcoming the premature convergence & stagnation problems as in basic PSO algorithm & Particle swarm optimization with shrinkage factor & inertia weight approach (PSO-SFIWA. In this paper SMIB system along with PID damped SVC controller is considered for study. The generator speed deviation is used as an auxiliary signal to SVC, to generate the desired damping. This controller improves the dynamic performance of power system by reducing the steady-state error. The controller parameters are optimized using basic PSO, PSO-SFIWA & Advanced Adaptive PSO. Computational results show that Advanced Adaptive based SVC controller is able to find better quality solution as compare to conventional PSO & PSO-SFIWA Techniques.

  17. Power transfer capability assessment of transmission interfaces with SVC and load shedding systems

    Energy Technology Data Exchange (ETDEWEB)

    Pavlovsky, V. [DMCC-Engineering, Kiev (Ukraine). Inst. of Electrodynamics; Dolzhenitsa, Y. [DMCC Engineering, Kiev (Ukraine); Ushapovskiy, K. [National Power Co. Ukrenergo, Kiev (Ukraine)

    2009-07-01

    As a result of deregulation in the power industry, energy trade and markets are pushing transmission system operators to operate their systems closer to the edge of the power transfer capability. Voltage instability and inadequate reactive power support of generators is a key factor in most major outages around the world. The ideal way to control power systems is to avoid emergencies by reliable planning and secure operation of power systems. Therefore, the accurate calculation of the power transfer capability of transmission interfaces is an important task on the planning and operation stages. This paper discussed the issue of transfer capability assessment and monitoring for interfaces with static var compensator (SVC) and load shedding schemes. It also proposed a special measure, a distance to voltage instability point, to monitor transfer capability on-line. The distance may be observed by measurement of SVC output. The paper considered the problem of optimal SVC size selection and a new approach was proposed based on P-V curves analysis. The paper discussed the problem formulation and proposed approach. A case was also presented in order to demonstrate the proposed approach on the IPS Ukraine-Crimea interface. It was concluded that the proposed approach allows the optimal rating of SVC for increasing transfers capability of transmission corridors. 12 refs., 9 figs.

  18. Research progress in non-permanent vein cava filters

    International Nuclear Information System (INIS)

    Vein cava filter placement has already become one of the most effective measures for preventing pulmonary embolism which is usually secondary to deep vein thrombosis. With the development of research, non-permanent vein cava filter has been widely used. This paper aims to describe the recent progress in the research of non-permanent vein cava filters. (authors)

  19. Origin of the infrarenal part of the caudal vena cava in the pig.

    Science.gov (United States)

    Cornillie, P; Van Den Broeck, W; Simoens, P

    2008-10-01

    The vascular topography in the lumbar region of pig embryos and young fetuses was three-dimensionally reconstructed to study some controversial aspects of the origin and development of the infrarenal part of the caudal vena cava. Contrary to general belief, it was found that the supracardinal veins, which form the azygos veins in the thorax, do not take part in the construction of the caudal vena cava in the lumbar region. These veins do appear in the abdomen, but they are only involved in the formation of the lumbar and ascending lumbar veins. The infrarenal part of the caudal vena cava arises from the lumbar part of the right caudal cardinal vein. Whilst this venous pattern is established, the lumbar part of the left caudal cardinal vein disappears and its former location is occupied by large lymphatic connections between the cysterna chyli and the retroperitoneal mesenteric lymphatic sac. On the basis of these findings, a number of hypotheses on the development of anatomical variations of the caudal vena cava should be reconsidered. PMID:18537942

  20. Prenatal diagnosis of isolated interrupted inferior vena cava with azygos continuation to superior vena cava

    Directory of Open Access Journals (Sweden)

    Do Thi Cam Giang

    2014-01-01

    Full Text Available Absence of inferior vena cava is an uncommon congenital abnormality. It is usually associated with other structural anomalies, typically left isomerism. We report a case of interrupted inferior vena cava with azygos continuation diagnosed as an isolated finding during routine prenatal ultrasound scan, confirmed by post-natal echocardiography. Detailed ultrasound examination of the fetal anatomy failed to demonstrate other anomalies. The neonatal course of this fetus was uneventful.

  1. Endovascular treatment of superior vena cava syndrome

    DEFF Research Database (Denmark)

    Duvnjak, Stevo; Andersen, Poul Erik

    2011-01-01

    clinically with superior vena cava syndrome and according caval stenosis confirmed by computed tomography. The causes of stenoses were non-small cell carcinoma in 22 patients and small cell carcinoma in 8 patients. RESULTS: In all patients the stents were placed as intended in all patients there was an...

  2. Inferior vena cava aneurysm. A case report

    International Nuclear Information System (INIS)

    Aneurysmal dilatation of the inferior vena cava can occur in patients with heart disease or, very likely, with congenital weakness of the vascular wall. Chest x-ray discloses a mass in right cardiophrenic angle. The diagnosis can be confirmed by ultrasound, more invasive measures being unnecessary. (Author) 6 refs

  3. Control design for SVC`s on the Mead-Adelanto and Mead-Phoenix Transmission Project

    Energy Technology Data Exchange (ETDEWEB)

    Larsen, E.V.; Clark, K.; Hill, A.T.; Piwko, R.J. [GE Power Systems, Schenectady, NY (United States). Power Systems Engineering Dept.; Beshir, M.J.; Bhuiyan, M.; Hormozi, F.J. [Los Angeles Dept. of Water and Power, CA (United States); Braun, K. [Siemens, Erlangen (Germany)

    1996-07-01

    A major project is under construction to increase the capability of the 500 kV transmission system between Arizona and Southern California. This project includes two 388 Mvar SVC`s, which are needed primarily to stabilize power oscillations across the interface. The control system for these SVC`s includes some new concepts to accomplish this stabilizing influence. This paper describes the important features of this control system, including the main design considerations.

  4. Transient stability and voltage regulation enhancement via coordinated control of generator excitation and SVC

    Energy Technology Data Exchange (ETDEWEB)

    Cong, L.; Wang, Y. [Nanyang Technological University (Singapore). School of Electrical and Electronic Engineering; Hill, D.J. [City University of Hong Kong, Kowloon (China). Dept. of Electronic Engineering

    2005-02-01

    This paper focuses on designing the coordinated control of Static Var Compensator (SVC) and generator excitation to achieve both the transient stability and voltage regulation enhancement of power systems. With the help of feedback linearization technique and robust control theory, the nonlinearity of power system, the variation in the system structure, the parameter uncertainties of the plant and the interconnections between generator and SVC are taken into consideration. The resulting controller is capable of stabilizing the overall system and achieving simultaneous transient stability and voltage regulation enhancement under diverse operating conditions. Only local measurements are required. The performance of the controller is evaluated through numeric simulation. Simulation results show that both transient stability and voltage quality can be improved effectively regardless of the system operating points and fault locations. (author)

  5. Power System Stability Improvement of Long Transmission Line System by Using Static Var Compensator (SVC

    Directory of Open Access Journals (Sweden)

    Pardeep Singh Virk

    2013-09-01

    Full Text Available Power system stability is defined as the ability of power system to preserve it’s steady stability or recover the initial steady state after any deviation of the system’s operation. This paper will discuss how SVC has successfully been applied to control dynamic performance of transmission system and regulate the system voltage effectively. Present time power systems are being operated nearer to their stability limits due to economic and environmental reasons. Maintaining a stable and secure operation of a powersystem is therefore a very important and challenging issue. Shunt FACTS devices play an important role in improving the transient stability, increasing transmission capacity and damping low frequency oscillations. In this paper shunt FACTS device-SVC is used in a two area power system for improving the power system stability. MATLAB software has been used in this study.

  6. Power System Stability Improvement of Long Transmission Line System by Using Static Var Compensator (SVC)

    OpenAIRE

    Pardeep Singh Virk

    2013-01-01

    Power system stability is defined as the ability of power system to preserve it’s steady stability or recover the initial steady state after any deviation of the system’s operation. This paper will discuss how SVC has successfully been applied to control dynamic performance of transmission system and regulate the system voltage effectively. Present time power systems are being operated nearer to their stability limits due to economic and environmental reasons. Maintaining a stable and secure ...

  7. Tratamento da síndrome da veia cava superior Treatment of superior vena cava syndrome

    OpenAIRE

    Luís Marcelo Inaco Cirino; Rafael Ferreira Coelho; Ivan Dias da Rocha; Bernardo Pinheiro de Senna Nogueira Batista

    2005-01-01

    A veia cava superior é formada pela união das duas veias inominadas, direita e esquerda, e localiza-se no mediastino médio, à direita da artéria aorta e anteriormente à traquéia. A síndrome da veia cava superior representa um conjunto de sinais (dilatação das veias do pescoço, pletora facial, edema de membros superiores, cianose) e sintomas (cefaléia, dispnéia, tosse, edema de membro superior, ortopnéia e disfagia) decorrentes da obstrução do fluxo sanguíneo através da veia cava superior em d...

  8. Percutaneous insertion of the inferior vena cava filter

    International Nuclear Information System (INIS)

    Objective: To evaluate the effect of inferior vena cava filter for prevention of pulmonary embolus (PE) formation. Methods: Twenty-eight cases of deep venous thrombosis (DVT) were treated with insertion of the inferior vena cava filter. Results: The filter was implanted into inferior vena cava below the rena vein. There were no severe complications occurred in the group. Twenty-seven cases were followed up to 2-34 months, and no migration of the filters were found. And no pulmonary embolism were revealed in fifteen cases without pulmonary thromboembolism. Conclusions: The inferior vena cava filter implantation is a safe and effective method to prevent pulmonary thromboembolism

  9. Relationship Of FEF25-75, PEFR And SVC With Estrogen And Progesterone Level In Postmenopausal Women

    Directory of Open Access Journals (Sweden)

    Afroza Begum

    2011-12-01

    Full Text Available Background: Deterioration of lung function is common in women after menopause, which may be related to very low estrogen and progesterone level.Objective: To observe FEF25-75, PEFR and SVC (slow vital capacity values in apparently healthy postmenopausal women to find out their relationships with serum estrogen and progesterone.Methods: This study was carried out in the Department of Physiology in BSMMU, Dhaka in the year 2007. 30 healthy postmenopausal women aged 45 to 60 years and 30 healthy premenopausal women aged 20 to 30 years during their different phases of menstrual cycle were studied. Postmenopausal women were residents of Dhaka city and premenopausal subjects were medical students. FEF25-75, PEFR and SVC of all subjects were measured by a digital micro spirometer. Their estrogen and progesterone levels were estimated by Micro particle Enzyme Immunoassay (MEIA method. Data were analyzed by Pearson’s correlation coefficient test, one way ANOVA and unpaired‘t’ testResults: The mean percentage of predicted values of FEF25-75 and PEFR were lower in postmenopausal women compared to those of follicular and luteal phases of premenopausal women but it was not significant. Measured values of SVC was Significantly (p<.001 lower in postmenopausal women compared to those of follicular and luteal phases of premenopausal women. Again Mean serum estrogen and progesterone levels were significantly (p<.001 lower in post menopausal women compared to those of follicular and luteal phases of premenopausal women. In post menopausal women, FEF25-75 was positively, PEFR and SVC were negatively correlated with progesterone level. PEFR and SVC showed positive correlattion and FEF25-75 showed negative correlation with serum estrogen level. All these correlations were statistically non significant. In premenopausal women FEF25-75 and PEFR showed positive correlation and SVC showed negative correlation with serum progesterone level. The relationships were

  10. Backward-Shifted Strategies Based on SVC for HTTP Adaptive Video Streaming

    OpenAIRE

    Ye, Zakaria; El-Azouzi, Rachid; Jimenez, Tania; Eitan ALTMAN; Valentin, Stefan

    2016-01-01

    Although HTTP-based video streaming can easily penetrate firewalls and profit from Web caches, the underlying TCP may introduce large delays in case of a sudden capacity loss. To avoid an interruption of the video stream in such cases we propose the Backward-Shifted Coding (BSC). Based on Scalable Video Coding (SVC), BSC adds a time-shifted layer of redundancy to the video stream such that future frames are downloaded at any instant. This pre-fetched content maintains a fluent video stream ev...

  11. The characteristics of action potential and nonselective cation current of cardiomyocytes in rabbit superior vena cava

    Institute of Scientific and Technical Information of China (English)

    WANG Pan; YANG XinChun; LIU XiuLan; BAO RongFeng; LIU TaiFeng

    2008-01-01

    As s special focus in initiating and maintaining atrial fibrillation (AF), cardiomyocytes in superior vena cavs (SVC) have distinctive electrophysiological characters. In this study, we found that comparing with the right atrial (RA) cardiomyoctyes, the SVC cardiomyoctyes had longer APD90 at the different basic cycle lengths; the conduction block could be observed on both RA and SVC cardiomyoctyes. A few of SVC cardiomyoctyes showed slow response action potentials with automatic activity and some others showed early afterdepolarization (EAD) spontaneously. Further more, we found that there are nonselective cation current (INs) in both SVC and RA cardiomyocytes. The peak density of INs in SVC cardiomyocytes was smaller than that in RA cardiomyocytes. Removal of extracellular divalent cation and glucose could increase INs in SVC cardiomyocytes. The agonist or the antagonist of INs may increase or decrease APD. To sum up, some SVC cardiomyocytes possess the ability of spontaneous activity; the difference of transmembrane action potentials between SVC and RA cardiomyocytes is partly because of the different density of INs between them; the agonist or the antagonist of INs can increase or decrease APD leading to the enhancement or reduction of EAD genesis in SVC cardiomyocytes. INs in rabbit myocytes is fairly similar to TRPC3 current in electrophysiological property, which might play an important role in the mechanisms of AF.

  12. Clinical application and advancement of inferior vena cava filter

    International Nuclear Information System (INIS)

    Deep venous thrombosis is a common disorder, with a considerably high incidence and mortality. Inferior vena cava filter provides fruitful means in decrease and prevention of fatal pulmonary embolism. The authors reviewed the history, indications and applications of inferior vena cava filter for different types of deep venous thrombosis, with outlook of future trends. (authors)

  13. Superior vena cava syndrome in children.

    OpenAIRE

    Gupta, Vineeta; Ambati, Srikanth R.; Pant, P.; Bhatia, Baldev

    1981-01-01

    Superior vena cava syndrome (SVCS) is rare in childhood. 18 cases of SVCS were seen in children ranging from 3–14 years with a mean age of 8.8 years. There were 15 males and 3 female children. Diagnosis could be confirmed in 17 cases as one child succumbed to severe respiratory distress without a definitive diagnosis. The commonest cause of SVCS was lymphoma. Non-Hodgkin’s lymphoma (NHL) was more common than Hodgkin’s disease. In two cases the final diagnosis was tuberculosis of mediastinal l...

  14. Application of the Phillips-Heffron model in the analysis of the damping torque contribution to power systems by SVC damping control

    Energy Technology Data Exchange (ETDEWEB)

    Wang, H.F.; Swift, F.J. [Manchester Metropolitan University (United Kingdom). Dept. of Electrical and Electronic Engineering

    1996-06-01

    In this paper, an extended Phillips-Heffron model of a power system installed with a static V Ar compensator (SVC) is established and applied to analyse the damping torque contribution of SVC damping control to the power system. Some basic issues, such as the capability of the SVC damping control to supply positive damping to the power system, the best location of the SVC damping control, its control strategy and its robustness to the changes of the operating conditions of the power system are investigated. Previous findings from numerical calculations and simulations of the effects of SVC damping control are confirmed by the analytical results in the paper. To supplement the analysis, the results of the calculations and simulations of an example power system are also presented. (Author)

  15. Clinically silent heterotaxy with polysplenia syndrome and IVC azygous continuation draining to SVC: CT findings. Case report

    International Nuclear Information System (INIS)

    Patients with heterotaxy syndrome often have complex cardiac and extracardiac anomalies requiring further detailed diagnostic evaluation. They often present severe cardiac failure early in life. Newer radiological modalities in the form of spiral computed tomography (CT) and three-dimensional reconstruction of spiral CT allow clear definition of the anatomy of these anomalies. A 59-year-old woman was diagnosed with polysplenia and multiple anomalies in an abdominal ultrasonography (US) during a control medical examination due to a trivial dietary mistake. She was then referred to our institution for further examination of these anomalies and an additional thoraco-abdominal computed tomography (CT) examination. The patient was totally asymptomatic at the time of admission. There was no significant past history and no abnormal laboratory data. We performed abdominal, pelvic and thoracic CT examinations using Somatom Siemens Emotion scanner. Non-enhanced sections were obtained with 8 mm scan collimation. Then, enhanced sections were obtained after administering a bolus of 120 ml contrast agent (Ultravist) with 5 mm scan collimation. Further multiple planar (MPR), volume rendering technique (VRT) and 3D reconstructions were performed in order to better visualize present abnormalities. Abdominal CT scans showed 5 spleens located in the right upper abdomen, 2 of them joined together in the form of a horseshoe with the latter 3 small splenules around. Liver was elongated and located in the central upper abdomen, with an enlarged left lobe. The dextraposition of stomach was found. Pancreas was short with hypoplastic tail. Furthermore, there was an abnormal passage of the IVC through the abdomen, which was interrupted at the level of diaphragm with azygous continuation in the thorax then joining the SVC, forming an arch and draining directly to the right-sided atrial appendage. No other anatomic anomalies, in particular those concerning the venous pulmonary return, lung

  16. Right superior vena cava draining into the left atrium

    International Nuclear Information System (INIS)

    The right superior vena cava draining into the left atrium is a rare malformation causing cyanosis and clubbing in patients in whom no other signs of congenital heart defect are present. Diagnosis may be difficult as cyanosis may be mild and the anomaly is not always easily detectable by echocardiography. For this reason we report a 13-month-old male in whom we confirmed the clinical and echocardiographic suspicion of anomalous drainage of the right superior vena cava using multidetector CT. This allowed successful surgical reconnection of the right superior vena cava to the right atrium. (orig.)

  17. SSR results obtained with a dynamic phasor model of SVC using modal analysis

    Energy Technology Data Exchange (ETDEWEB)

    Jusan, Fernando Cattan [Furnas Centrais Eletricas S.A, Av. Real Grandeza, 219, Sala B-605, Rio de Janeiro, RJ (Brazil); Gomes, Sergio Jr. [CEPEL, Av. Horacio Macedo, 354, 21941-911, Rio de Janeiro, RJ (Brazil); Taranto, Glauco Nery [Federal University of Rio de Janeiro/COPPE, Centro de Tecnologia, Sala H-343, Ilha do Fundao, P.O. Box 68504, Rio de Janeiro, RJ (Brazil)

    2010-07-15

    This paper presents the application of an improved dynamic phasor model of Static Var Compensator (SVC) in small-signal subsynchronous resonance (SSR) studies. The model is suitable for high frequency analysis (above 5 Hz) and takes into account the influence of Phase Locked Loop (PLL) circuit dynamics. A supplementary controller is designed for damping torsional modes due to SSR. The controller is designed using modal control theory to damp out critical modes in a wide range of series compensation and loading conditions. The study is conducted on the system-2 of the IEEE Second Benchmark Model. Excitation systems and power system stabilizers (PSS) are properly represented and incorporated into the system. Thus, the dynamic interactions among the several power system controllers and the network are considered in the supplementary controller design. The program PSCAD/EMTDC is used for the validation of the results obtained in the time domain simulations. (author)

  18. Immersion and Invariance-Based Coordinated Generator Excitation and SVC Control for Power Systems

    Directory of Open Access Journals (Sweden)

    Adirak Kanchanaharuthai

    2014-01-01

    Full Text Available A nonlinear coordinated control of excitation and SVC of an electrical power system is proposed for transient stability, and voltage regulation enhancement after the occurrence of a large disturbance and a small perturbation. Using the concept of Immersion and Invariance (I&I design methodology, the proposed nonlinear controller is used to not only achieve power angle stability, frequency and voltage regulation but also ensure that the closed-loop system is transiently and asymptotically stable. In order to show the effectiveness of the proposed controller design, the simulation results illustrate that, in spite of the case where a large perturbation occurs on the transmission line or there is a small perturbation to mechanical power inputs, the proposed controller can not only keep the system transiently stable but also simultaneously accomplish better dynamic properties of the system as compared to operation with the existing controllers designed through a coordinated passivation technique controller and a feedback linearization scheme, respectively.

  19. Injuries of the inferior vena cava.

    Science.gov (United States)

    Burch, J M; Feliciano, D V; Mattox, K L; Edelman, M

    1988-12-01

    Beginning in 1946, 577 patients with inferior vena cava injuries were managed at a single institution. After decreasing from 37 to 30 percent, the mortality rate showed a distinct increase in the last 7 years studied. This increase was related to an increasing percentage of patients who arrived in the emergency center in severe shock and required resuscitative thoracotomy. In-hospital care advances have not kept pace with improvements in prehospital care. Although venous complications have not been infrequent, morbidity has not been a significant long-term problem. Fatal pulmonary embolism occurred and was a special problem for patients over the age of 50. More basic research is needed to expedite diagnosis and vascular control in addition to understanding and treating the severe metabolic problems of patients dying from shock and hemorrhage. PMID:3202271

  20. Neoplasms of the inferior vena cava - pictorial essay

    International Nuclear Information System (INIS)

    This pictorial essay reviews common and rare neoplasms affecting the inferior vena cava (IVC, Table 1), with a particular emphasis on the clinical implications and the role and efficacy of the various imaging techniques. (author)

  1. Troubleshooting OptEase inferior vena cava filter retrieval.

    Science.gov (United States)

    Nakashima, Masaya; Kobayashi, Hideaki; Kobayashi, Masayoshi

    2016-01-01

    For treatment of deep vein thrombosis and prevention of pulmonary thromboembolism, a retrievable inferior vena cava filter is commonly utilized as an effective bridge to anticoagulation. However, we have experienced difficulties in retrieving inferior vena cava filters. Endovascular retrieval assisted by disposable biopsy forceps is an appropriate approach because it provides a less-invasive low-cost way to remove a migrated filter. We suggest this troubleshooting technique to deal with filter hook migration into the caval wall. PMID:24828829

  2. Superior vena cava syndrome: A radiation oncologist's perspective.

    Science.gov (United States)

    Talapatra, Kaustav; Panda, Soumadip; Goyle, Sandeep; Bhadra, Kallol; Mistry, Rajesh

    2016-01-01

    Superior vena cava syndrome is referred to as a constellation of symptoms and signs caused by obstruction of superior vena cava. It can occur due to both benign and malignant causes with the latter being the predominant. There is a paradigm shift in the approach to manage this condition. It is no longer considered a medical emergency and histological diagnosis is necessary before treatment. This article reviews the causes, symptoms, pathophysiology, and overall management policy which have changed over decades. PMID:27461602

  3. Application of Firefly Algorithm in Voltage Stability Environment Incorporating Circuit Element Model of SSSC with Variable Susceptance Model of SVC

    Directory of Open Access Journals (Sweden)

    Luke Jebaraj

    2014-01-01

    Full Text Available This paper proposes an application of firefly algorithm (FA based extended voltage stability margin and minimization of active (or real power loss incorporating Series-Shunt flexible AC transmission system (FACTS controller named as static synchronous series compensator (SSSC combined with static var compensator (SVC. A circuit model of SSSC and variable susceptance model of SVC are utilized to control the line power flows and bus voltage magnitudes, respectively, for real power loss minimization and voltage stability limit improvement. The line quality proximity index (LQP is used to assess the voltage stability of a power system. The values of voltage profile improvement, real power loss minimization, and the location and size of FACTS devices were optimized by FA. The results are obtained from the IEEE 14- and 30-bus test case systems under different operating conditions and compared with other leading evolutionary techniques such as shuffled frog leaping algorithm (SFLA, differential evolution (DE and particle swarm optimization (PSO.

  4. Design of a Single Input Fuzzy Logic Controller Based SVC for Dynamic Performance Enhancement of Power Systems

    Directory of Open Access Journals (Sweden)

    DR.D. PADMA SUBRAMANIAN

    2014-10-01

    Full Text Available This paper presents a design of a Single Input Fuzzy Logic Controller (SFLC based Static VAR Compensator (SVC for Dynamic performance enhancement of power systems. The SFLC uses only one input which is the signed distance and has the advantage of reduced number of rules. Improvement of dynamic response by the controller is illustrated in a bifurcation perspective. Bifurcation diagrams of steady state as well as periodic solutions are constructed using continuation method. From the bifurcation diagrams, the existence of various bifurcation points such as, unstable Hopf bifurcation (UHB, stable Hopf bifurcation (SHB, saddle node bifurcation (SNB and period doubling bifurcation (PDB are identified. With the use of tools of nonlinear dynamics, voltage collapse points, and chaotic solutions due to period doublings are unearthed. The effectiveness of the SFL controller over the conventional controller for SVC in delaying the incidence of Hopf bifurcation (HBF, SNB and hence increasing the loadability limit is illustrated for the test system.

  5. Relationship Of FEF25-75, PEFR And SVC With Estrogen And Progesterone Level In Postmenopausal Women

    OpenAIRE

    Afroza Begum; Taskina Ali; Noorzahan Begum,; Sultana Ferdousi; Shelina Begum; Zinat Ara Polly

    2011-01-01

    Background: Deterioration of lung function is common in women after menopause, which may be related to very low estrogen and progesterone level.Objective: To observe FEF25-75, PEFR and SVC (slow vital capacity) values in apparently healthy postmenopausal women to find out their relationships with serum estrogen and progesterone.Methods: This study was carried out in the Department of Physiology in BSMMU, Dhaka in the year 2007. 30 healthy postmenopausal women aged 45 to 60 years and 30 health...

  6. 一种面向视频传输的SVC码流排序方法%A Sorting Approach of SVC Streaming for Video Transmission

    Institute of Scientific and Technical Information of China (English)

    卢冀; 肖嵩; 吴成柯

    2011-01-01

    该文提出了一种适用于传输的可分级视频编码码流的排序方法.该方法通过对码流的合理选择和对失真的高效近似计算,优先传输率失真性能较好的可分级码流,从而提高了重建图像的质量.该文建立了用于划分复合可分级码流的状态模型,推导出了可分级码流失真的近似计算公式,在一定带宽限制下,采用率失真优化的方法对可分级码流进行排序.仿真结果表明该方法能提高视频流重建图像质量.%A sorting approach for Scalable Video Coding (SVC) streaming is proposed for video transmission. By the accurate states selection and the effective approximate distortion calculation of the fully scalable video streaming, the proposed approach can priority transmit the scalable streaming owning better rate-distortion performance, which improves effectively the reconstructed quality of video streaming. A state model is built to select layered streaming from the fully scalable video streaming, and the distortion approximate formula of the scalable streaming is deduced. The scalable streaming is reordered by employing the rate-distortion optimization under certain bandwidth limitations. The simulation results show that the proposed approach can improve the reconstructed quality of video streaming.

  7. Design of SVC Controller Based on Improved Biogeography-Based Optimization Algorithm

    Directory of Open Access Journals (Sweden)

    Feifei Dong

    2014-01-01

    Full Text Available Considering that common subsynchronous resonance controllers cannot adapt to the characteristics of the time-varying and nonlinear behavior of a power system, the cosine migration model, the improved migration operator, and the mutative scale of chaos and Cauchy mutation strategy are introduced into an improved biogeography-based optimization (IBBO algorithm in order to design an optimal subsynchronous damping controller based on the mechanism of suppressing SSR by static var compensator (SVC. The effectiveness of the improved controller is verified by eigenvalue analysis and electromagnetic simulations. The simulation results of Jinjie plant indicate that the subsynchronous damping controller optimized by the IBBO algorithm can remarkably improve the damping of torsional modes and thus effectively depress SSR, and ensure the safety and stability of units and power grid operation. Moreover, the IBBO algorithm has the merits of a faster searching speed and higher searching accuracy in seeking the optimal control parameters over traditional algorithms, such as BBO algorithm, PSO algorithm, and GA algorithm.

  8. Analysing Temporally Annotated Corpora with CAVaT

    CERN Document Server

    Derczynski, Leon

    2012-01-01

    We present CAVaT, a tool that performs Corpus Analysis and Validation for TimeML. CAVaT is an open source, modular checking utility for statistical analysis of features specific to temporally-annotated natural language corpora. It provides reporting, highlights salient links between a variety of general and time-specific linguistic features, and also validates a temporal annotation to ensure that it is logically consistent and sufficiently annotated. Uniquely, CAVaT provides analysis specific to TimeML-annotated temporal information. TimeML is a standard for annotating temporal information in natural language text. In this paper, we present the reporting part of CAVaT, and then its error-checking ability, including the workings of several novel TimeML document verification methods. This is followed by the execution of some example tasks using the tool to show relations between times, events, signals and links. We also demonstrate inconsistencies in a TimeML corpus (TimeBank) that have been detected with CAVaT...

  9. 支架植入术治疗上腔静脉综合征:金属支架的选择%Stent implantation for the treatment of superior vena cava syndrome:Selection of metallic stents

    Institute of Scientific and Technical Information of China (English)

    杨维竹; 潘恒; 黄兢姚; 江娜; 郑曲彬; 林俊清

    2013-01-01

    目的 探讨支架植入术治疗上腔静脉综合征(SVCS)中选择金属支架的要点.方法 收集51例SVCS,CT均显示上腔静脉(SVC)明显狭窄或闭塞;经股静脉穿刺插管,以球囊扩张狭窄或闭塞段后植入1枚或多枚金属内支架(Smart支架、Z-Stent支架、Fluency支架),直至复查造影显示SVC血流通畅.术后评价疗效.结果 51例SVCS中,50例双侧头臂静脉汇合处受累.支架植入术均获成功,28例植入Smart支架,17例植入Z-Stent,4例植入Fluency支架,2例为Smart支架内套Fluency支架;31例植入1枚支架,12例植入2枚支架,8例植入3枚支架.支架植入后48例临床症状明显改善,上腔静脉压显著下降.术中无SVC破裂等严重并发症发生.46例接受随访,其中18例于随访期内重现SVC阻塞症状,包括11例植入Smart支架、7例植入Z-Stent支架者,植入Fluency支架者未见复发.结论 根据SVC病变程度、位置,选择植入结构和特性适当的金属支架可使介入治疗SVCS安全、有效.%Objective To investigate the elective points of different types of metallic stents for implantation in patients with superior vena cava syndrome (SVCS).Methods Fifty-one patients with SVCS were enrolled.Enhanced CT showed obvious stenosis or occlusion of the superior vena cava (SVC) in all patients.Stent implantation was performed after balloon dilatation through femoral vein.One or more stents (Smart stent,Z-Stent and Fluency stent) were positioned till the obstruction of SVC flow was relieved.The therapeutic effects of stent implantation were evaluated.Results Among all 51 patients,invasion of bilateral brachiocephalic veins were observed in 50 patients.Technical success of stent implantation was achieved in all patients including 28 patients with Smart stent,17 with Z-Stent,4 with Fluency stent and 2 patients with Fluency+Smart stent.Significant improvements of SVCS symptoms was noticed in 48 patients after stent implantation,and the pressure of SVC

  10. Large hemangioma in a persistent left superior vena cava.

    Science.gov (United States)

    Hu, Wen; Wang, Xiang; Tan, Sichuang; Fan, Songqing; Liu, Jun; Yu, Fenglei; Tang, Jingqun

    2012-12-01

    Cardiac hemangiomas represent 1 to 2% of all detected benign heart tumors. Tumors in the coronary sinus have been reported; however, to our knowledge, there have been no reports of masses in a persistent left superior vena cava. We report here the first case of a 58-year-old man with a rare huge unicamerate cardiac hemangiomas in a persistent left superior vena cava. A communication vein between the coronary sinus and hemangiomas could be identified, and thrombus formation was found in the hemangiomas as well. PMID:23180384

  11. Leiomiossarcoma da veia cava inferior: relato de caso

    Directory of Open Access Journals (Sweden)

    Rafael Lemos Nascif

    2014-12-01

    Full Text Available Relatamos um caso de paciente do sexo feminino, 48 anos, com quadro clínico de dor abdominal de moderada intensidade e abaulamento do abdome. Ao exame físico constatou-se massa abdominal palpável. A tomografia computadorizada mostrou volumosa massa retroperitoneal, com realce heterogêneo e íntima relação com a veia cava inferior. Realizou-se ressecção em bloco da massa e do segmento invadido da veia cava. A histologia revelou leiomiossarcoma.

  12. Liver trauma and transection of the inferior vena cava

    International Nuclear Information System (INIS)

    CT of a child with severe liver trauma due to a seat belt injury demonstrated avulsion of a portion of the lateral segment of the left lobe of the liver. The location of nondependent extravasated contrast material aided in identification of the visceral fracture site (the sentinel contrast sign). Associated transection of the inferior vena cava was evidenced by hypoatenuating zones adjacent to all the major hepatic veins and vena cava (hepatic perivenous tracking). Recognition of these two signs is important so that the radiologist can help the surgeon select the optimal operative approach. (orig.)

  13. Bilateral inferior vena cava filter insertion in a patient with duplication of the infrarenal vena cava.

    LENUS (Irish Health Repository)

    Leong, S

    2010-06-19

    BACKGROUND: Inferior vena cava (IVC) filter insertion is a commonly performed procedure for indications such as recurrent pulmonary emboli or contraindication to anticoagulation. Symptomatic duplication of the IVC is exceedingly rare with only a handful of cases being described in the literature. AIM: We report an unusual case of a patient with symptomatic duplication of the IVC. RESULT: A 53-year-old woman presented at our hospital for resection of a cerebral metastasis from a non-small cell lung cancer following a recent diagnosis of bilateral lower limb deep venous thrombosis. This required perioperative reversal of anticoagulation and IVC filter insertion. Conventional venography performed during filter insertion documented the existence of a duplicated IVC. CONCLUSION: We present a case of a symptomatic duplication of the IVC requiring filter insertion. We review the developmental anatomy of the IVC along with the diagnostic findings and management strategies available.

  14. Duodenal Perforation Caused by an Inferior Vena Cava Filter

    OpenAIRE

    Bae, Mi Ju; Chung, Sung Woon; Lee, Chung Won; Kim, Sangpil; Song, Seunghwan

    2012-01-01

    The inferior vena cava (IVC) filter is known as an effective and safe method for preventing fatal pulmonary thromboembolism in patients with deep vein thrombosis. Usually, the remaining IVC filters are asymptomatic and do not cause clinical problems. We report a case of duodenal perforation caused by a remaining IVC filter.

  15. Duodenal perforation caused by an inferior vena cava filter.

    Science.gov (United States)

    Bae, Mi Ju; Chung, Sung Woon; Lee, Chung Won; Kim, Sangpil; Song, Seunghwan

    2012-02-01

    The inferior vena cava (IVC) filter is known as an effective and safe method for preventing fatal pulmonary thromboembolism in patients with deep vein thrombosis. Usually, the remaining IVC filters are asymptomatic and do not cause clinical problems. We report a case of duodenal perforation caused by a remaining IVC filter. PMID:22363914

  16. Hepatic and postrenal segment anomalies of inferior vena cava

    Energy Technology Data Exchange (ETDEWEB)

    Choe, Yeon Hyeon; Park, Jae Hyung; Yeon, Kyung Mo; Han, Man Chung [Seoul National University College of Medicine, Seoul (Korea, Republic of)

    1986-06-15

    Postrenal segment anomalies of inferior vena cava such as bilateral inferior vena cava and left-sided inferior vena cava can simulate lymphadenopathy on CT scan and these anomalous veins need consideration in retroperitoneal operations such as procedures for prevention of venous embolism, splenorenal shunt operation and aortic prosthetic replacement. Retrocaval ureter is a rare cause of obstructive uropathy or medical deviation of ureter. We analyzed 16 cases of postrenal segment anomalies diagnosed by CT, vena cavography, retrograde pyelography and ultrasonography including six rare positional anomalies at hepatic segment of inferior vena cava diagnosed by cardiac angiography. The results were as follows. 1. Postrenal segment anomalies were 6 cases of bilateral IVC, 8 cases of left-sided IVC and 2 cases of retrocaval ureters. On CT scan, 3 cases of bilateral IVC and 4 cases of left-sided IVC were accompanied by malignant tumors, but caval veins could be discriminated from enlarged nodes because of continuous tubular nature of vein on consecutive sections with homogeneous strong enhancement. Two cases of retrocaval ureters showed hydroureteronephrosis due to ureteral compression by IVC. 2. Hepatic segment anomalies were 6 cases. Five cases of IVC on left side of vertebra crossed midline at live to enter right-sided right atrium and one case of IVC on right side crossed midline to enter left-sided right atrium. Four cases of complex cardiac anomalies, 4 cases of annapolis and 2 cases of situs ambiguous were associated with these anomalies.

  17. Acetylcholinesterase and Butyrylcholinesterase Inhibitory Compounds from Corydalis cava (Fumariaceae)

    Czech Academy of Sciences Publication Activity Database

    Chlebek, J.; Macáková, K.; Cahlíková, L.; Kurfürst, Milan; Kuneš, J.; Opletal, J.

    2011-01-01

    Roč. 6, č. 5 (2011), s. 607-610. ISSN 1934-578X Institutional research plan: CEZ:AV0Z40720504 Keywords : corydalis cava * fumariaceae * alzheimer ´s disease Subject RIV: CF - Physical ; Theoretical Chemistry Impact factor: 1.242, year: 2011

  18. Ecocardiografia transesofágica e diagnóstico intraoperatório de veia cava superior esquerda persistente Ecocardiografía transesofágica y diagnóstico intraoperatorio de vena cava superior izquierda persistente Transesophageal echocardiography and intraoperative diagnosis of persistent left superior vena cava

    Directory of Open Access Journals (Sweden)

    Alexander Alves da Silva

    2009-12-01

    persistent left superior vena cava has an incidence of 0.5% in the normal population, but in patients with congenital cardiopathy its incidence ranges from 3% to 10%. The objective of this report was to present a case of intraoperative diagnosis with transesophageal echocardiography and to emphasize the importance of its routine use in surgical procedures for correction of congenital cardiopathies. CASE REPORT: This is a 16-year old male patient, ASA II, with a diagnosis of superior sinus venosus interatrial communication (IAC with partial anomalous drainage of the pulmonary veins scheduled for the surgical correction of the cardiopathy. After induction of general anesthesia, transesophageal echocardiography (TEE showed initially a dilation of the right cardiac chambers, a 17-mm superior sinus venosus IAC, anomalous drainage of the right superior pulmonary vein draining into the right superior vena cava (SVC, and dilation of the coronary sinus raising the possibility of persistent left superior vena cava. To confirm this suspicion, 10 mL of NS (works as a contrast in echocardiography were injected in the venous access of the left arm, and microbubbles crossing the coronary sinus were observed immediately afterwards confirming the diagnosis of persistent left superior vena cava. CONCLUSIONS: Routine intraoperative transesophageal echocardiography in patients with congenital cardiopathy is a fundamental auxiliary method, not only for the surgeon, often having direct influence on the surgical technique used, but also for the anesthesiologist, who can get useful information for the hemodynamic management of the patient.

  19. Nonlinear Coordinated Control of AVR, SVC and TCSC%AVR、SVC与TCSC的非线性协调控制

    Institute of Scientific and Technical Information of China (English)

    翁利国; 李小腾; 夏彦辉

    2014-01-01

    The article establishes the integrated dynamic model of power systems including AVR, SVC and TCSC considering disturbance and then applies DFL and control theory to design a robust controller. The experiment in six generators system indicates the coordinated controller can improve the dynamic per-formance and transient stability of power systems, hence enhance the power transfer capacity of power systems.%本文致力于建立包含AVR( Automatic Voltage Regulator)、SVC( Static Var Compensator)和TCSC( Flexible Alternative Current Transmission Systems)的电力系统综合动态模型,模型中考虑了电力系统运行中可能遭受到的干扰;应用直接反馈线性化方法将系统的非线性状态方程精确线性化,再对线性化后的状态方程运用控制理论设计了鲁棒控制器。对六机系统的仿真实验证明了本文提出的AVR、SVC与TCSC的协调控制策略能够明显改善电力系统的动态性能、提高系统的暂态稳定水平,从而提高了系统的输电能力。

  20. Agenesia de cava superior associada a bloqueio atrioventricular de 3º grau Agenesis of the right superior vena cava associated with total heart block

    Directory of Open Access Journals (Sweden)

    Gustavo J. Ventura Couto

    2008-03-01

    Full Text Available A persistência de veia cava superior esquerda com ausência da veia cava superior é uma anomalia rara, principalmente quando associada a bloqueio atrioventricular de 3º grau. Relatamos o caso de uma paciente, na qual durante implante de marca-passo definitivo, para a correção de bloqueio atrioventricular total, foi detectada presença de veia cava superior esquerda com suspeição de ausência de veia cava superior, o que levou ao emprego de técnica diferenciada para fixação do eletrodo ventricular. Para confirmação da provável agenesia, foram realizados diversos exames complementares de imagem, demonstrando-se a dificuldade no diagnóstico da síndrome aqui descrita.The superior left vena cava with the absent superior vena cava is a rare abnormality, especially when associated with total heart block. We report a case of a patient in which the presence of superior left vena cava and the absence of the superior vena cava was detected during the implantation of a pacemaker for the correction of a total heart block, which led us to use a different technique for the fixation of the ventricular electrode. To confirm the supposed absence, several image exams were made showing the difficulty on the diagnosis of the described syndrome.

  1. Difference in left renal vein pressure: an indicator for free of reconstruction after ligation in retroperitoneal tumor patients

    OpenAIRE

    Chengli Miao; Mengmeng Xiao; Tengyan Li; Gang Liu; Xing Liu; Yue Kong; Chenghua Luo

    2015-01-01

    We hypothesized that the left renal vein pressure difference (ΔP) before and after the ligation can serve as an objective indicator for free of reconstruction after resection of a retroperitoneal tumor with renal segment of inferior vena cava and right kidney. After established a model of left renal vein compression, 45 miniature pigs were operated on experimental procedures including renal segment of inferior vena cava resection, right nephrectomy, and left renal vein ligation. The ΔPs of le...

  2. Management of the Thrombosed Filter-Bearing Inferior Vena Cava

    OpenAIRE

    Sildiroglu, Onur; Ozer, Harun; Turba, Ulku Cenk

    2012-01-01

    Inferior vena cava (IVC) filter thrombosis is a complex problem. Thrombus within an IVC filter may range from an asymptomatic small thrombus to critical IVC occlusion that affects both lower extremities. The published experience of IVC thrombosis management in relation to filters is either anecdotal or limited to a small group of patients; however, endovascular treatment methods appear to be safe and effective in patients with IVC thrombosis. This review focuses on filter-related IVC thrombos...

  3. Unusual variant of infrarenal duplication of inferior vena cava

    Directory of Open Access Journals (Sweden)

    Ranjan Kumar Sahoo

    2016-01-01

    Full Text Available Infrarenal inferior vena cava (IVC duplication is a rare anomaly. Most of the cases are asymptomatic and are detected incidentally. Prior knowledge of the anomaly is essential for safe procedure by intervention radiologist, retroperitoneal operation, and multi-visceral recovery operation from deceased donor by surgeon. We report a case of infrarenal IVC duplication detected incidentally during contrast-enhanced computed tomography examination of abdomen of a patient presenting with viral hepatitis and mild obstructive jaundice.

  4. Asymptomatic Duodenal Perforation from an Inferior Vena Cava Filter

    OpenAIRE

    Park, Jean R.; Oza, Veeral M; Krishna, Somashekar G

    2014-01-01

    Recent exponential increase in inferior vena cava (IVC) filter placements has led to a higher rate of filter complications. A 46-year-old man with a past history of IVC filter placement for bilateral deep vein thrombosis presented with lower abdominal pain. Imaging studies demonstrated IVC filter strut penetrations into multiple structures. Upper endoscopy confirmed an uncomplicated single IVC filter strut penetration into the duodenal wall. The abdominal pain was determined to be unrelated t...

  5. Modeling Flow Past a Tilted Vena Cava Filter

    International Nuclear Information System (INIS)

    Inferior vena cava filters are medical devices used to prevent pulmonary embolism (PE) from deep vein thrombosis. In particular, retrievable filters are well-suited for patients who are unresponsive to anticoagulation therapy and whose risk of PE decreased with time. The goal of this work is to use computational fluid dynamics to evaluate the flow past an unoccluded and partially occluded Celect inferior vena cava filter. In particular, the hemodynamic response to thrombus volume and filter tilt is examined, and the results are compared with flow conditions that are known to be thrombogenic. A computer model of the filter inside a model vena cava is constructed using high resolution digital photographs and methods of computer aided design. The models are parameterized using the Overture software framework, and a collection of overlapping grids is constructed to discretize the flow domain. The incompressible Navier-Stokes equations are solved, and the characteristics of the flow (i.e., velocity contours and wall shear stresses) are computed. The volume of stagnant and recirculating flow increases with thrombus volume. In addition, as the filter increases tilt, the cava wall adjacent to the tilted filter is subjected to low velocity flow that gives rise to regions of low wall shear stress. The results demonstrate the ease of IVC filter modeling with the Overture software framework. Flow conditions caused by the tilted Celect filter may elevate the risk of intrafilter thrombosis and facilitate vascular remodeling. This latter condition also increases the risk of penetration and potential incorporation of the hook of the filter into the vena caval wall, thereby complicating filter retrieval. Consequently, severe tilt at the time of filter deployment may warrant early clinical intervention.

  6. Modeling Flow Past a Tilted Vena Cava Filter

    Energy Technology Data Exchange (ETDEWEB)

    Singer, M A; Wang, S L

    2009-06-29

    Inferior vena cava filters are medical devices used to prevent pulmonary embolism (PE) from deep vein thrombosis. In particular, retrievable filters are well-suited for patients who are unresponsive to anticoagulation therapy and whose risk of PE decreased with time. The goal of this work is to use computational fluid dynamics to evaluate the flow past an unoccluded and partially occluded Celect inferior vena cava filter. In particular, the hemodynamic response to thrombus volume and filter tilt is examined, and the results are compared with flow conditions that are known to be thrombogenic. A computer model of the filter inside a model vena cava is constructed using high resolution digital photographs and methods of computer aided design. The models are parameterized using the Overture software framework, and a collection of overlapping grids is constructed to discretize the flow domain. The incompressible Navier-Stokes equations are solved, and the characteristics of the flow (i.e., velocity contours and wall shear stresses) are computed. The volume of stagnant and recirculating flow increases with thrombus volume. In addition, as the filter increases tilt, the cava wall adjacent to the tilted filter is subjected to low velocity flow that gives rise to regions of low wall shear stress. The results demonstrate the ease of IVC filter modeling with the Overture software framework. Flow conditions caused by the tilted Celect filter may elevate the risk of intrafilter thrombosis and facilitate vascular remodeling. This latter condition also increases the risk of penetration and potential incorporation of the hook of the filter into the vena caval wall, thereby complicating filter retrieval. Consequently, severe tilt at the time of filter deployment may warrant early clinical intervention.

  7. Double vena cava inferior:A report of three cases

    Institute of Scientific and Technical Information of China (English)

    Isin Ureyen; Zeynep Kestel; Elif Gulsah Sahin; Alper Karalok; Taner Turan; Nurettin Boran; Gokhan Tulunay

    2013-01-01

    Congenital anomalies of the vena cava inferior (VCI) develop as a result of the persistence of the embryonic venous system. The majority of cases is clinically silent and is diagnosed in routine dissection studies, in retroperitoneal surgeries, or through imaging for other reasons. We report three cases with a double VCI. We outline our operative policy, summarize the embryological development of the VCI and present these cases as a reminder of this rare anatomical variation.

  8. Detection by means of CT of inferior vena cava filters

    International Nuclear Information System (INIS)

    Vena cava filters are an excellent tool for the prevention of pulmonary embolism (PE) in patients with deep vein thrombosis (DVT) of the lower limbs. However, these devices are not entirely free of complications as thrombi can develop inside them, threatening to occlude them completely. The objective of this report is to study the incidence of thrombosis in vena cava filters, as well as their impact on prognosis. We also mention the importance of CT as an imaging technique in the study of this complication. We present 30 patients in whom different filters were implanted and their prospective follow-up by means of CT over a mean follow-up period of 36 months. Chi-square analysis was used to determine whether there was a significant relationship among the complications encountered (p<0,05), and their course over time was studied by means of Kaplan-Meyer curves. Five cases (16%) of complete thrombosis of the filter were observed among patients in whom the Gunther model had been implanted, yielding an index of probability of complete permeability of the inferior vena cava at 13 months of 82%. Thrombi of different degrees (between 5% and 60%) were also observed inside the filter in ten patients (33%) with Gunther, Simon-Nitional and LGM models. Filter thrombosis was not significantly associated with the onset of recurrent PE or of venous disorders involving lower limbs, the relationship between PE and preimplantation presence of inferior vena cava thrombosis was significant (p<0.01). It was also observed that post implantation anti coagulation did not significantly prevent later onset of filter thrombosis. (Author)

  9. Myofibroblastic tumor associated to superior vena cava syndrome

    International Nuclear Information System (INIS)

    Inflammatory myofibroblastic tumor (IMT) is an uncommon pathological entity of unknown cause, composed of differentiated myofibroblastic cells accompanied by plasma cells, lymphocytes and eosinophils, which involve extrapulmonary and pulmonary tissues. IMT has an unpredictable clinical course, rarely undergoes malignant transformation. Local invasion and involvement of the mediastinum and hiliar structures are unusual manifestations; however; we reports a case of superior vena cava syndrome and IMT

  10. Inferior vena cava leiomyosarcoma confirmed by catheter suction biopsy during digital subtraction angiography

    OpenAIRE

    Wei, Ning; Xu, Xiang-Dong; Xu, Hao; ZU, MAO-HENG

    2014-01-01

    Leiomyosarcoma of vascular origin is a rare disease and most cases arise in the inferior vena cava. Inferior vena cava leiomyosarcoma (IVCLMS) usually presents in females in their sixth decade of life. The clinical symptoms are often non-specific and the diagnosis is often delayed. Current imaging techniques can accurately differentiate inferior vena cava neoplasms from other non-neoplastic lesions. However, definitive diagnosis of IVCLMS needs histologic evidence. We report a case of IVCLMS ...

  11. Failure of Femoral Access to Electrophysiological Evaluation Due to Aplasia of the Inferior Vena Cava

    Science.gov (United States)

    Parahuleva, Mariana S.; Burgazli, Mehmet; Soydan, Nedim; Franzen, Wolfgang; Güttler, Norbert; Erdogan, Ali

    2016-01-01

    We report an interesting case of a man with a persistent left superior vena cava (PLSVC) with left azygos vein who underwent electrophysiological evaluation. Further evaluation revealed congenital dilated azygos vein, while a segment connecting the inferior vena cava (IVC) to the hepatic vein and right atrium was missing. The azygos vein drained into the superior vena cava, and the hepatic veins drained directly into the right atrium. The patient did not have congenital anomalies of the remaining thoracoabdominal vasculature. PMID:27257399

  12. Optimal sizing and location of SVC devices for improvement of voltage profile in distribution network with dispersed photovoltaic and wind power plants

    International Nuclear Information System (INIS)

    Highlights: • Significant voltage variations in a distribution network with dispersed generation. • The use of SVC devices to improve the voltage profiles are an effective solution. • Number, size and location of SVC devices are optimized using genetic algorithm. • The methodology is presented on an example of a real distribution system in Serbia. - Abstract: Intermittent power generation of wind turbines and photovoltaic plants creates voltage disturbances in power distribution networks which may not be acceptable to the consumers. To control the deviations of the nodal voltages, it is necessary to use fast dynamic control of the reactive power in the distribution network. Implementation of the power electronic devices, such as Static Var Compensator (SVC), enables effective dynamic state as well as a static state of the nodal voltage control in the distribution network. This paper analyzed optimal sizing and location of SVC devices by using genetic algorithm, to improve nodal voltages profile in a distribution network with dispersed photovoltaic and wind power plants. Practical application of the developed methodology was tested on an example of a real distribution network

  13. A new Nitinol stent for use in superior vena cava syndrome

    DEFF Research Database (Denmark)

    Andersen, Poul Erik; Midtgaard, Annette; Brenøe, Anne-Sofie;

    2015-01-01

    time of stent deployment. RESULTS: All patients had superior vena cava obstruction and clinical superior vena cava syndrome caused by malignant expansive mediastinal disease (eight patients non-small cell lung cancer and four small cell lung cancer). The technical success with deployment of the stents......AIM: The aim of the study was to assess the early clinical experience with the Zilver Vena stent in treating patients with malignant superior vena cava syndrome. METHODS: Demographic, procedural, and follow-up data of 12 patients (seven women; mean age 69 years) treated for superior vena cava...

  14. Voltage Stability Analysis with Static Var Compensator (SVC for Various Faults in Power System with and Without Power System Stabilizers (PSS

    Directory of Open Access Journals (Sweden)

    Mohammad Mohammadi

    2011-07-01

    Full Text Available However, in previous study the effect of SVC and PSS on voltage transient in power system with suitable model of these component for various faults such as Single Line to Ground faults (SLG and Line to line and Line to Line to Ground (LL and LLG and three phase faults have not been considered and analyzed and investigated. Shunt Flexible AC Transmission System (FACTS devices, when placed at the mid-point of along transmission line, play an important role in controlling the reactive power Xow to the power network and hence both the system voltage Xuctuions and transient stability. This study deals with the location of a shunt FACTS device to improve transient stability in along transmission line with pre defined direction of real power flow. The validity of the mid-point location of shunt FACTS devices is verified, with various shunt FACTS devices, namely Static Var Compensator (SVC in a long transmission line using the actual line model. It has been observed that the FACTS devices, when placed slightly oT-centre towards sending-end, give better performance in improving transient stability and the location depends on the amount of local/through load. This study investigates the effects of Static Var Compensator (SVC on voltage stability of a power system. The functional structure for SVC built with a Thyristor Controlled Reactor (TCR and its model are described. The model is based on representing the controller as variable impedance that changes with the firing angle of the TCR. A Power System Computer Aided Design /Electromagnetic Transients including DC (PSCAD/EMTDC is used to carry out simulations of the system under study and detailed results are shown to access the performance of SVC on the voltage stability of the system.

  15. A Novel Technique for Inferior Vena Cava Filter Extraction

    Energy Technology Data Exchange (ETDEWEB)

    Johnston, Edward William, E-mail: ed.johnston@doctors.org.uk; Rowe, Luke Michael Morgan; Brookes, Jocelyn; Raja, Jowad; Hague, Julian, E-mail: julian.hague@uclh.nhs.uk [University College Hospital, Multidisciplinary Endovascular Team (United Kingdom)

    2013-05-02

    Inferior vena cava (IVC) filters are used to protect against pulmonary embolism in high-risk patients. Whilst the insertion of retrievable IVC filters is gaining popularity, a proportion of such devices cannot be removed using standard techniques. We describe a novel approach for IVC filter removal that involves snaring the filter superiorly along with the use of flexible forceps or laser devices to dissect the filter struts from the caval wall. This technique has used to successfully treat three patients without complications in whom standard techniques failed.

  16. Vena cava agenesi kan vise sig som inkarcereret lyskebrok

    DEFF Research Database (Denmark)

    Safir-Hansen, Kristina; Achiam, Michael Patrick

    The case describes a 45-year-old man with a rare finding of vena cava agenesia presented as incarcerated groin hernia. From childhood the patient had developed dilatation of subcutaneous veins with establishment of aneurismal dilatation in the lower right side of the abdomen and groin. The patient...... was submitted with severe abdominal pain in the lower right side. The case describes the difficulties of an initially incorrect radiological diagnosis of incarcerated groin hernia and the discrepancy of the clinical findings. The case stresses the importance of a thorough evaluation of each patient....

  17. Retrievable Inferior Vena Cava Filters for Venous Thromboembolism

    International Nuclear Information System (INIS)

    Inferior vena cava (IVC) filters are used as an alternative to anticoagulants for prevention of fatal pulmonary embolism (PE) in venous thromboembolic disorders. Retrievable IVC filters have become an increasingly attractive option due to the long-term risks of permanent filter placement. These devices are shown to be technically feasible in insertion and retrieval percutaneously while providing protection from PE. Nevertheless, there are complications and failed retrievals with these retrievable filters. The aim of the paper is to review the retrievable filters and their efficacy, safety, and retrievability

  18. Inferior Vena Cava Duplication: Incidental Case in a Young Woman.

    Science.gov (United States)

    Coco, Danilo; Cecchini, Sara; Leanza, Silvana; Viola, Massimo; Ricci, Stefano; Campagnacci, Roberto

    2016-01-01

    A case of a double inferior vena cava (IVC) with retroaortic left renal vein, azygos continuation of the IVC, and presence of the hepatic portion of the IVC drained into the right renal vein is reported and the embryologic, clinical, and radiological significance is discussed. The diagnosis is suggested by multidetector computed tomography (MDCT), which reveals the aberrant vascular structures. Awareness of different congenital anomalies of IVC is necessary for radiologists to avoid diagnostic pitfalls and they should be remembered because they can influence several surgical interventions and endovascular procedures. PMID:27217964

  19. Radiological evaluation of inferior vena cava obstruction: pictorial essay

    International Nuclear Information System (INIS)

    The clinical diagnosis of inferior vena cava (IVC) obstruction is often difficult, since patients may present with a multitude of signs and symptoms. The clinical manifestations depend on several factors: the underlying cause, the level of obstruction, the adequacy of collateral circulation, the presence of intercurrent disease, and the organ system involved. Although the most common clinical manifestations are deep venous thrombosis in the legs, abdominal pain, low back pain, loin pain and hematuria, patients may present with unusual and varied pathologic conditions. IVC obstruction may resemble or be associated with such conditions as congestive cardiac failure, cirrhosis of the liver or renal disease. (author)

  20. Estudi i millora d'una planta productora de cava

    OpenAIRE

    Boza Macías, Marta

    2008-01-01

    El present projecte té com a objectiu principal l’automatització d’una part del procés productiu del cava. Concretament, la millora que es desitja realitzar consisteix en la instal·lació d’un autòmat programable que controli l’emplenat i buidat dels dipòsits d’emmagatzematge. Aquest control es realitzarà utilitzant sensors capacitius, encarregats de controlar els nivells, tant alt com baix, dels citats dipòsits. A part de controlar en tot moment l’estat en que es troben les ...

  1. Ausência de veia cava inferior: relato de caso Absence of the inferior vena cava: case report

    Directory of Open Access Journals (Sweden)

    Elton Correia Alves

    2010-12-01

    Full Text Available A ausência congênita de veia cava inferior é achado incomum e ocasional durante exames complementares ou cirurgias do abdome. Em razão de a maioria dos pacientes sem outras malformações serem assintomáticos, há dificuldade em estimar a prevalência dessas anomalias. O objetivo deste trabalho foi relatar o caso de um paciente de 28 anos, sexo masculino, referido para radiografia de tórax devido a quadro de febre alta (39ºC não-responsiva à medicação. Radiografia de tórax sugeriu dilatação de veia ázigos. Em inquérito dirigido para sintomas cardiovasculares, referiu dor torácica (durante atividade física e em repouso e dispneia ocasionais durante o sono associada ao período em que intensificou a prática de exercícios. Realizada tomografia computadorizada sem contraste e, posteriormente, contrastada. As mesmas não esclareceram o caso, fazendo-se necessário angiotomografia, a qual evidenciou ausência de veia cava inferior torácica.The congenital absence of the inferior vena cava is a rare and occasional finding at complementary exams or abdominal surgeries. As the majority of patients without other malformations are asymptomatic, it is hard to estimate the prevalence of these anomalies. Our goal was to report a case of a 28-year-old patient, male, referred to thorax X-ray due to high fever state (39ºC, nonresponder to medication. The X-ray suggested azygos vein dilatation. The interview about cardiovascular symptoms revealed thoracic pain during both physical exercises and at rest, and occasional dyspnea during sleep related to the period of intensification of physical exercises. Computadorized tomography with and without contrast did not solve the case, what explain the request of an angiotomography, that showed absence of thoracic inferior vena cava.

  2. Advanced Techniques for Removal of Retrievable Inferior Vena Cava Filters

    Energy Technology Data Exchange (ETDEWEB)

    Iliescu, Bogdan; Haskal, Ziv J., E-mail: ziv2@mac.com [University of Maryland School of Medicine, Division of Vascular and Interventional Radiology (United States)

    2012-08-15

    Inferior vena cava (IVC) filters have proven valuable for the prevention of primary or recurrent pulmonary embolism in selected patients with or at high risk for venous thromboembolic disease. Their use has become commonplace, and the numbers implanted increase annually. During the last 3 years, in the United States, the percentage of annually placed optional filters, i.e., filters than can remain as permanent filters or potentially be retrieved, has consistently exceeded that of permanent filters. In parallel, the complications of long- or short-term filtration have become increasingly evident to physicians, regulatory agencies, and the public. Most filter removals are uneventful, with a high degree of success. When routine filter-retrieval techniques prove unsuccessful, progressively more advanced tools and skill sets must be used to enhance filter-retrieval success. These techniques should be used with caution to avoid damage to the filter or cava during IVC retrieval. This review describes the complex techniques for filter retrieval, including use of additional snares, guidewires, angioplasty balloons, and mechanical and thermal approaches as well as illustrates their specific application.

  3. Big Bang-Big Crunch Algorithm for Voltage Stability Limit Improvement by Coordinated Control of SVC Settings

    Directory of Open Access Journals (Sweden)

    S. Sakthivel

    2013-07-01

    Full Text Available Modern power system networks are operated under highly stressed conditions and there is a risk of voltage instability problems owing to increased load demand. A power system needs to be with sufficient voltage stability margin for secured operation. In this study, SVC parameters of location and size along with generator bus voltages, transformer tap settings are considered as control parameters for voltage stability limit improvement by minimizing loss and voltage deviation. The control parameters are varied in a coordinated manner for better results. The line based LQP voltage stability indicator is used for voltage stability assessment. The nature inspired meta heuristic Big Bang-Big Crunch (BB-BC algorithm is exploited for optimization of the control variables and the performance is compared with that of PSO algorithm. The effectiveness of the proposed algorithm is tested on the standard IEEE 30 bus system under normal and N-1 line outage contingency conditions. The results obtained from the simulation encourage the performances of the new algorithm.

  4. Simon nitinol vena cava filters: effectiveness and complications; Simon Nitinol-Vena-cava-Filter: Wirksamkeit und Komplikationen

    Energy Technology Data Exchange (ETDEWEB)

    Wolf, F.; Thurnher, S.; Lammer, J. [Universitaetsklinik fuer Radiodiagnostik, Vienna (Austria). Abt. fuer Angiographie und Interventionelle Radiologie

    2001-10-01

    Purpose: The aim of this retrospective analysis was to evaluate the clinical safety and effectiveness of the simon nitinol inferior vena cava filter (SNF) for prevention of pulmonary embolism. Patients and Methods: 117 patients (63 male, 54 female; aged 58.38 {+-} 14.59 years) underwent percutaneous implantation of an SNF from 1993 through 1999. Patient reports were retrospectively analysed for complications during and after implantation and deep venous thrombosis (DVT) and pulmonary embolism before and after implantation. Helical-CT with contrast media and plain abdominal radiography were performed on 35 patients, helical-CT alone on two patients. We checked the position and configuration of the SNF and looked for a perforation of the filter legs through the wall of the inferior vena cava (IVC). The IVC and deep pelvic veins were analysed for patency. Results: During implantation 10 of 117 (9%) patients had minor complications, major complications were reported in 0.9% (1/117). There was no significant increase in thrombosis of the deep pelvic veins and the IVC after implantation. Pulmonary re-embolism (PE) was documented in 9 out of 117 patients (7.7%). One out of the 35 examined patients (2.9%) showed a single strut fracture of the SNF. Tilting more than 15 was seen in 7 out of 37 patients (19%). Dislocation of the SNF more than 10 mm occurred in one out of 35 patients (2.9%), perforation through the wall of the IVC in all 37 patients. We found no occlusion of the IVC. (orig.) [German] Ziel: Das Ziel dieser Arbeit war, in einer retrospektiven Analyse die Sicherheit und Effektivitaet des simon nitinol vena cava filters (SNF) zu untersuchen. Patienten und Methoden: Zwischen 1993 und 1999 wurde bei 117 Patienten (63 Maenner, 54 Frauen; 58,38 Jahre {+-} 14,59 Jahre) ein SNF perkutan in die vena cava inferior (VCI) implantiert. Retrospektiv wurden die Krankengeschichten aller 117 Patienten studiert und auf Komplikationen in Bezug auf den SNF sowie auf neu

  5. Inferior vena cava leiomyosarcoma confirmed by catheter suction biopsy during digital subtraction angiography.

    Science.gov (United States)

    Wei, Ning; Xu, Xiang-Dong; Xu, Hao; Zu, Mao-Heng

    2014-01-01

    Leiomyosarcoma of vascular origin is a rare disease and most cases arise in the inferior vena cava. Inferior vena cava leiomyosarcoma (IVCLMS) usually presents in females in their sixth decade of life. The clinical symptoms are often non-specific and the diagnosis is often delayed. Current imaging techniques can accurately differentiate inferior vena cava neoplasms from other non-neoplastic lesions. However, definitive diagnosis of IVCLMS needs histologic evidence. We report a case of IVCLMS in a 61-year old Chinese woman. This is the first IVCLMS case confirmed by catheter suction biopsy during digital subtraction angiography. PMID:25232438

  6. Abnormal draining of great cardiac vein into superior vena cava

    International Nuclear Information System (INIS)

    Full text: A 47-year-old man presented with atypical chest pain in last three months. Physical examination findings were normal. ECG showed normal sinus rhythm. Transthoracic echocardiography revealed normal left and right ventricular systolic functions. ECG gated coronary CT angiography was performed. The patient's coronary CT angiography showed normal coronary arteries, however the great cardiac vein course was abnormal. The course of the vein was not in atrioventicular groove, bypassing the coronary sinus and draining to superior vena cava. The coronary sinus of patient is formed by posterior marginal vein, middle cardiac vein and lateral marginal vein and drained into the right atrium. We also observed subtle myocardial bridges on coronary arteries. Myocardial bridges appeared to explain patient's chest pain. With optimal medical therapy, the patient's symptoms resolved

  7. Simon nitinol vena cava filters: effectiveness and complications

    International Nuclear Information System (INIS)

    Purpose: The aim of this retrospective analysis was to evaluate the clinical safety and effectiveness of the simon nitinol inferior vena cava filter (SNF) for prevention of pulmonary embolism. Patients and Methods: 117 patients (63 male, 54 female; aged 58.38 ± 14.59 years) underwent percutaneous implantation of an SNF from 1993 through 1999. Patient reports were retrospectively analysed for complications during and after implantation and deep venous thrombosis (DVT) and pulmonary embolism before and after implantation. Helical-CT with contrast media and plain abdominal radiography were performed on 35 patients, helical-CT alone on two patients. We checked the position and configuration of the SNF and looked for a perforation of the filter legs through the wall of the inferior vena cava (IVC). The IVC and deep pelvic veins were analysed for patency. Results: During implantation 10 of 117 (9%) patients had minor complications, major complications were reported in 0.9% (1/117). There was no significant increase in thrombosis of the deep pelvic veins and the IVC after implantation. Pulmonary re-embolism (PE) was documented in 9 out of 117 patients (7.7%). One out of the 35 examined patients (2.9%) showed a single strut fracture of the SNF. Tilting more than 15 was seen in 7 out of 37 patients (19%). Dislocation of the SNF more than 10 mm occurred in one out of 35 patients (2.9%), perforation through the wall of the IVC in all 37 patients. We found no occlusion of the IVC. (orig.)

  8. A rare case of left superior vena cava draining into left atrium demonstrated by MDCT.

    Science.gov (United States)

    Ardilouze, Paul; Bricot, Vincent; Maurel, Christophe; Christiaens, Luc

    2009-01-01

    We describe a rare case of persistent left superior vena cava draining directly into the left atrium with no associated anomaly of the coronary sinus or the atrial septum, discovered by multidetector computed tomography. PMID:17692952

  9. Evaluation of superior vena cava syndrome by axial CT and CT phlebography

    International Nuclear Information System (INIS)

    Transverse axial computed tomography (CT) has been combined with CT digital phlebography to study nine patients with superior vena cava syndrome. Six were due to malignancy, two were secondary to benign disease, and one was a paraneoplastic manifestation. This combined CT approach successfully identified the abnormal morphology of the superior vena cava, demonstrating external compression, encasement, or intraluminal thrombus in all patients and the collateral venous channels in eight. This technique is a rapid, informative, and cost-effective method for the workup of superior vena cava syndrome. The CT digital phlebogram, however, is not successful in regularly and optimally opacifying the normal superior vena cava because of the limited amount of contrast material, dilution effect of the nonopacified incoming flow from the jugular and azygos veins, and the lack of image enhancement from the CT digital scanograms

  10. Evaluation of superior vena cava syndrome by axial CT and CT phlebography

    Energy Technology Data Exchange (ETDEWEB)

    Moncada, R.; Cardella, R.; Demos, T.C.; Churchill, R.J.; Cardoso, M.; Love, L.; Reynes, C.J.

    1984-10-01

    Transverse axial computed tomography (CT) has been combined with CT digital phlebography to study nine patients with superior vena cava syndrome. Six were due to malignancy, two were secondary to benign disease, and one was a paraneoplastic manifestation. This combined CT approach successfully identified the abnormal morphology of the superior vena cava, demonstrating external compression, encasement, or intraluminal thrombus in all patients and the collateral venous channels in eight. This technique is a rapid, informative, and cost-effective method for the workup of superior vena cava syndrome. The CT digital phlebogram, however, is not successful in regularly and optimally opacifying the normal superior vena cava because of the limited amount of contrast material, dilution effect of the nonopacified incoming flow from the jugular and azygos veins, and the lack of image enhancement from the CT digital scanograms.

  11. Temporary vena cava filter for the thrombolytic treatment of venous thrombosis

    International Nuclear Information System (INIS)

    Objective: To study the value of the temporary vena cava filter in the prevention of ectopic embolism formation in cases with thrombolytic therapy of venous thrombosis. Methods: Of 11 patients, 10 suffered from venous thrombosis of lower limb and 1 from thrombosis of right internal jugular vein with persistent truncus arteriosus were treated by inserting permanent or temporary vena cava filter via median vein. Results: In all 11 case control of symptoms followed this treatment occurred 7 to 15 days, thrombi were completely or partly dissolute, the blood vessels re-canalized, and finally removed the temporary vena cava filter. There were no complication and ectopic emboli related to thrombolytic therapy. Conclusions: The observation indicated that temporary vena cava filter insertion is safe and effective to prevent ectopic embolism in thrombolytic therapy of venous thrombosis

  12. A novel technique to remove inferior vena cava filters using a homemade snare device.

    Science.gov (United States)

    Singh, Kuldeep; Zia, Saqib; Khan, Muhammad Asad; Marco, Sean; Hill, David

    2014-01-01

    The need to retrieve inferior vena cava filters is quite evident due to the long-term complications. We present a novel technique to remove inferior vena cava filters using a homemade snare created using a looped a 0.014-inch semistiff wire. Employing this technique, 18 consecutive retrievable filters were removed. All filters were easily snared on the very first attempt, and no complications occurred. Our novel technique to retrieve filters is efficient, safe, and cost-effective. PMID:26992977

  13. Living donor liver transplantation in the absence of inferior vena cava: a case report.

    Science.gov (United States)

    Hatipoglu, S; Olmez, A; Ozgor, D; Kayaalp, C; Yilmaz, S

    2012-01-01

    Because of difficulties in the supply of cadaveric organs, of living donor liver transplantations are performed in increasing numbers. Congenital hepatic fibrosis associated with fibrosis and atrophy of the inferior vena cava were present in a potential recipient of living donor liver transplantation. This case report documented living donor liver transplantation as a treatment modality for a patient with absence of the inferior vena cava due to chronic liver failure. PMID:22841266

  14. Anatomy of the ostia venae hepaticae and the retrohepatic segment of the inferior vena cava.

    OpenAIRE

    Camargo, A M; Teixeira, G G; Ortale, J R

    1996-01-01

    In 30 normal adult livers the retrohepatic segment of inferior vena cava had a length of 6.7 cm and was totally encircled by liver substance in 30% of cases. Altogether 442 ostia venae hepaticae were found, averaging 14.7 per liver and classified as large, medium, small and minimum. The localisation of the openings was studied according to the division of the wall of the retrohepatic segment of the inferior vena cava into 16 areas.

  15. Anatomy of the ostia venae hepaticae and the retrohepatic segment of the inferior vena cava.

    Science.gov (United States)

    Camargo, A M; Teixeira, G G; Ortale, J R

    1996-02-01

    In 30 normal adult livers the retrohepatic segment of inferior vena cava had a length of 6.7 cm and was totally encircled by liver substance in 30% of cases. Altogether 442 ostia venae hepaticae were found, averaging 14.7 per liver and classified as large, medium, small and minimum. The localisation of the openings was studied according to the division of the wall of the retrohepatic segment of the inferior vena cava into 16 areas. PMID:8655416

  16. Huge Trombus including Left Renal Vein, Ovarian Vein, and Inferior Vena Cava Mimicking Renal Colic

    OpenAIRE

    Sakir Ongun; Sermin Coban; Abdullah Katgi; Funda Obuz; Aykut Kefi

    2014-01-01

    A 31-year-old female presented with acute left flank pain; she had a C/S at the postpartum day 24. Ureteral stone was suspected but ultrasound examination was normal. Then Doppler ultrasound revealed a trombus in left renal vein and inferior vena cava. Contrast enhanced MDCT scan showed swelled and nonfunctional left kidney, a trombus including distal part of left ovarian vein, left renal vein, and inferior vena cava. We started anticoagulation treatment. Further examination revealed diagnosi...

  17. Tratamento cirúrgico da síndrome da veia cava superior causado por timoma invasivo Surgical treatment of superior vena cava syndrome caused by invasive thymoma

    OpenAIRE

    George Ronald Soncini da Rosa; Ney Takizawa; Douglas Schimidt; Mitur Sugita

    2010-01-01

    Paciente do sexo masculino, branco, 57 anos, portador de síndrome da veia cava superior havia 3 meses, devido a timoma invasivo em mediastino médio e anterior, levando a comprometimento da veia cava superior intrínseca e extrinsecamente. Após avaliação por tomografia computadorizada e angiorressonância magnética de tórax, o paciente foi submetido à ressecção radical do timoma - derivação venosa da veia subclávia esquerda para átrio direito, com tubo de PTFE (politetrafluoroetileno). Relevante...

  18. A case of bilateral superior vena cava with variations in the azygos system and in the heart.

    Science.gov (United States)

    Ortale, J R; Grill, E H

    1994-08-01

    A case of bilateral superior vena cava is described in an adult cadaver of undetermined sex and age. The persistent left superior vena cava had a larger diameter approximately equal to that of the right superior vena cava ending in a wide caliber coronary sinus. Variations in the azygos system were also found. The ventricles show thin walls with trabeculae carneae forming one to five strata in the left ventricle, and from one to three strata in the right ventricle. PMID:8085654

  19. A Retrospective Study (2004-2008) of Poultry Diseases Diagnosed in Veterinary Teaching Hospital (Vth), Usmanu Danfodiyo University Sokoto (Udus) and Sokoto Veterinary Centre (Svc), Sokoto State, Nigeria

    OpenAIRE

    A.Y. Adamu

    2009-01-01

    A retrospective study of clinical records in the Veterinary Teaching Hospital, Usmanu DanfodiyoUniversity Sokoto (VTH-UDUS) and Sokoto Veterinary Centre (SVC) was carried out to establish theoccurrence and distribution of poultry diseases over the period of five years (2004-2008). A total of 1,034 caseswere recorded out of which 337 (32.9%) was Infectious bursal disease (IBD), 147 (14.0%) was coccidiosis,while 128 (12.4%) and 102 (9.9%) were Newcastle disease (NCD) and Fowl typhoid (FT) respe...

  20. Radiographic evaluation of caudal vena cava size in dogs

    International Nuclear Information System (INIS)

    Dilation of the caudal vena cava (CVC) on lateral thoracic radiographs is often interpreted as suggestive of right-sided congestive heart failure, To quantitate the clinical utility of evaluating CVC size as an indicator of right-sided heart disease, we compared the ratio of the diameter of the CVC as measured on a left lateral thoracic radiograph to the descending aorta (Ao), length of the thoracic vertebra above the tracheal bifurcation (VL), and width of the right fourth rib (R4) in 35 dogs with right heart disease and 35 control dogs, Each CVC ratio(CVC/Ao, CVC/VL, CVC/R4) was statistically larger in dogs with right heart disease, Response operating characteristic curves and likelihood ratios were used to determine ratios helpful in identifying dogs with right heart disease. A CVC/Ao > 1.50, CVC/VL > 1.30, or CVC/R4 > 3.50 are strongly suggestive of a right-sided heart abnormality in a patient

  1. Mesoaortic entrapment of a left inferior vena cava

    International Nuclear Information System (INIS)

    A persistent left inferior vena cava (IVC) is a rare anomaly, with a reported incidence of only 0.2-0.5%. When present, it courses between the superior mesenteric artery and the aorta to continue as the right IVC, similar to the course of a left renal vein (LRV). This anomaly is usually asymptomatic, but there may be vague abdominal complaints if the IVC is compressed in the mesoaortic angle. Although symptomatic compression of the LRV (anterior nutcracker syndrome) is well recognized, there has been only one report in the literature of a similar compression of a persistent left IVC. Because of its rarity, this anomaly may be missed or mistaken for other conditions on imaging. An accurate diagnosis is crucial as the presence of this anomaly may have implications for surgical treatment of aortic lesions or placement of an IVC filter. Magnetic resonance angiography and, more recently, multidetector computed tomography scan, can provide an exquisite three-dimensional demonstration of vascular abnormalities

  2. Inferior vena cava filter placement in orthopedic surgery.

    Science.gov (United States)

    Bass, Anne R; Mattern, Christopher J; Voos, James E; Peterson, Margaret G E; Trost, David W

    2010-09-01

    Inferior vena cava (IVC) filters were developed for the treatment of venous thromboembolism but in high-risk patients are often used for prophylaxis instead. In the study reported here, we reviewed all the orthopedic surgery cases in which IVC filters were used at our institution in 2005. Charts were analyzed and patients contacted by telephone for long-term follow-up. IVC filters were used in 90 (0.96%) of the 9,348 inpatient orthopedic surgeries. Sixty-one percent of filters were placed for prophylaxis, though only 42% of patients with prophylactic filters had a contraindication to anticoagulation. Eighty-one percent of patients with prophylactic filters who received anticoagulation received warfarin. Ratios of prophylactic-to-treatment filters were 3.25 for fracture surgeries, 2.1 for arthroplasties, and 0.89 for spine surgeries. Five percent of patients with prophylactic filters developed deep vein thrombosis. Fifty-two percent of filters were retrievable, but only 40% of those were removed a mean of 5.1 months (SD, 3.9 months) after placement. Filter removal was associated with complications in 11% of patients, and in another 10% the filter could not be removed. Forty-one patients were contacted a mean of 21 months (SD, 3 months) after filter placement. Only 32% of those who still had filters were on anticoagulation at follow-up. PMID:21290021

  3. Inferior vena cava filters: What radiologists need to know

    International Nuclear Information System (INIS)

    Inferior vena cava (IVC) filters are a controversial mechanical adjunct in the prevention of pulmonary embolism, the most serious result of venous thromboembolism. Despite modern IVC filters being in clinical use for more than 45 years, there is still uncertainty amongst many radiologists about the indications for IVC filter placement and their removal, particularly the more recent prophylactic use in patients without confirmed deep vein thrombosis (DVT) or pulmonary embolism (PE). Recently published guidelines on filter use from the National Institute of Health and Clinical Excellence (NICE) and other professional bodies are discussed. The vast majority of IVC filters in the UK are inserted by interventional radiologists, so radiologists may be the first point of contact for information requested by other clinicians. The increasing use of filters means that radiologists will encounter filters increasingly often during abdominal cross-sectional imaging. Awareness of common filter-related complications, such as tilting, thrombosis, and caval perforation, is useful to reassure or alert other clinicians. The potential role of filters in upper extremity DVT and requirement for concomitant anticoagulation is discussed

  4. Study of 99Tcm-annexin V distribution in inferior vena cava thrombus models of rabbits

    International Nuclear Information System (INIS)

    To study 99Tcm-Annexin V distribution in inferior vena cava thrombus models of rabbits and uptake of 99Tcm-Annexin V in fresh and old venous thrombus. Rabbits (n=15) were randomly grouped into 3 groups (the fresh thrombus group, old thrombus group, and control group). The rabbits of two thrombus groups developed inferior vena cava thrombus models by operations. The control group received sham operation. The fresh thrombus group and control group rabbits were injected 99Tcm-Annexin V after operating 1 d; the old thrombus group 14 d. After 1 h all rabbits were killed by injecting overdose pentobarbital sodium. The thrombus (or the inferior vena cava about 3 cm below inferior pole of right kidney level in the control group rabbits), blood, thrombus area inferior vena cava, head lateral inferior vena cava (except the control group), thigh muscle, stomach, myocardium, pulmonary, liver, kidney, spleen, bone and small intestine were obtained from all group rabbits. The ex tissue and blood were weighed and measured by a Well-type detector. The percentage of the injected dose per gram of ex tissue (or blood) was calculated by the above data. The thrombus to blood, thrombus area inferior vena cava, head lateral inferior vena cava and thigh muscle ratios were calculated by percentage of the injected dose per gram of ex tissue (or blood). The test was used to compare the fresh thrombus group and old thrombus group by SPSS 17.0. The percentage of' the injected dose per gram of thrombi (0.01894± 0.002 16% ID/g) in the fresh thrombus group was higher than the old thrombus group (0.00473±0.001 28% ID/g), P<0.05. The thrombus to blood, thrombus area inferior vena cava, head lateral inferior vena cava and muscle ratios (3.42±1.06, 26.32±13.60, 31.23 ±16.00, 111.62±52.23) in the fresh thrombus group were higher than the old thrombus group (0.98±0.09, 5.12±2.01, 6.25±2.38, 21.82±5.93), P<0.05 for all. All the thrombi of the fresh thrombus group were confirmed fresh

  5. Neuroimaging findings in neonates and infants from superior vena cava obstruction after cardiac operation

    International Nuclear Information System (INIS)

    Extraventricular obstructive hydrocephalus may develop after superior vena cava obstruction, an uncommon complication after cardiac surgery.Objective. To describe the neuroimaging findings in neonates and infants with superior vena cava thrombosis after cardiac surgery for congenital heart disease.Materials and methods. Between 1993 and 2001, 333 neonates and infants in our hospital underwent cardiac surgery, of whom 13 (3.9%) subsequently acquired superior vena cava syndrome. Eleven of these 13 children (7 boys, 4 girls) were evaluated by head ultrasound and computed tomography scans.Results. One child had normal findings on head ultrasound, and 10 children had extraventricular obstructive hydrocephalus (EVOH). In 6 children, aggravation of the hydrocephalus was noted up to 11.4 months after cardiac surgery; in 3 of them, the hydrocephalus was shunted to the peritoneum. One child had thrombosis of the dural sinuses, and 1 had hemorrhagic infarction. Two children died during follow-up.Conclusion. EVOH is a common complication of superior vena cava thrombosis, and head ultrasound should be performed in all neonates and infants with superior vena cava thrombosis after cardiac surgery. Long-term follow-up is needed, as the hydrocephalus may worsen even months after surgery. (orig.)

  6. Vena cava filters in cancer patients: experience with 50 patients Filtros de veia cava inferior em pacientes com câncer: experiência em 50 casos

    Directory of Open Access Journals (Sweden)

    Antonio Eduardo Zerati

    2005-10-01

    Full Text Available OBJECTIVE: To study the immediate and late results obtained from the implantation of vena cava filters in cancer patients with deep vein thrombosis concomitant with neoplasia. METHODS: This was a retrospective evaluation of 50 patients with an association of cancer and deep venous thrombosis who underwent interruption of the inferior vena cava and the insertion of permanent vena cava filters. The indications for the procedure, filter implantation technique, early and late complications related to the operation, and the clinical evolution were evaluated. RESULTS: The most frequent indication for filter implantation was the contraindication for full anticoagulant treatment (80%. The femoral vein was the preferred access route (86% of the patients. There were no complications related to the surgical procedure. During the follow-up, the following complications were observed: 1 episode of nonfatal pulmonary thromboembolism, 2 cases of occlusion of the inferior vena cava, and 1 case of thrombus retained in the device. Twenty patients (40% died due to progression of the neoplasm. CONCLUSIONS: Interruption of the inferior cava vein using an endoluminal filter is a procedure with a low rate of complications. It is a safe and efficient measure for preventing pulmonary embolism in cancer patients who have deep vein thrombosis of the lower limbs.OBJETIVO: Estudar os resultados imediatos e tardios obtidos com a implantação de filtros de veia cava inferior em pacientes com trombose venosa profunda concomitante a neoplasia. MÉTODOS: Avaliamos retrospectivamente 50 pacientes com câncer e trombose venosa profunda associada submetidos a interrupção de veia cava inferior com filtros intraluminais definitivos. Foram estudados aspectos referentes à indicação do procedimento, à técnica de implante dos dispositivos, complicações precoces e tardias relacionadas à operação e à evolução dos pacientes. RESULTADOS: A indicação mais freqüente para o

  7. Extension of adrenal tumors into the vena cava: results of magnetic resonance angiography

    International Nuclear Information System (INIS)

    In rare cases, large adrenal masses with a suspicion of malignancy exhibit tumor extension into the adrenal vein and inferior vena cava. When planning surgery, the relationship of the extension to the inferior vena cava is of decisive improtance. We describe in two cases on the detection of a tumor thrombus in the inferior vena cava arising from a malignant adrenal mass by means of MR angiography (TOF, coronary 2D GRE images [FLASH], 3 slices acquired during 15 second apnea). The angiograms correlated well with the results of DSA venacavography and with the intraoperative findings. Thus, MRA has been demonstrated to be suitable for the certain proof of a venous tumor thrombus not only in cases of renal cell carcinomas but also in cases of malignant adrenal masses. The method should be applied whenever there is evidence of a venous involvement in the adrenal MR images. (orig.)

  8. Evaluation of the superior vena cava system in children with digital subtraction angiography

    International Nuclear Information System (INIS)

    The authors report a new pediatric application of digital subtraction angiography (DSA) that is the evaluation of the superior vena cava system. 22 children have been explored. All of them had a history of previous central venous catheter placement for parenteral nutrition (13), hemodialysis (5), chemotherapy or antibiotic therapy (4). The aim of the examination was to obtain a venous mapping before a new catheter placement (14 cases) or to look for a venous thrombosis origin of superior vena cava syndrom or septicemia (8 cases). Except failure of two examinations because of absence of venous injection site, DSA showed thrombosis of one vein in 7 cases and of multiple veins in 11 cases. A pulmonary embolus was also discovered. The authors conclude that this non invasive method yields very valuable information on superior vena cava system

  9. Temporary Inferior Vena Cava Filters: How Do We Move Forward?

    Science.gov (United States)

    Arous, Edward J; Messina, Louis M

    2016-05-01

    Despite their widespread use, the indications for the selective use of temporary inferior vena cava (IVC) filters remains uncertain with few trials supporting their use. Additionally, the risks of long-term temporary IVC filter insertion are being increasingly discussed amongst the mainstream media and through multiple class action lawsuits. Retrievable IVC filters were specifically designed to have a less secure implantation in order to facilitate retrieval. However, multiple reports have demonstrated significant filter-related complications, most commonly related to duration of implantation. Furthermore, the risk is not isolated to one manufacturer alone. The incidence of filter-related complications is linearly related to its duration of time on the market. Currently, the FDA recommends that IVC filters be removed within 25-54 days of their implantation. Unfortunately, little evidence exists to show that this recommendation is followed routinely. Recently, the PRESERVE Trial (NCT02381509) was initiated as a multicenter non-randomized open label study to determine the safety and effectiveness of commercially available IVC filters (both temporary and permanent) in individuals who require mechanical prophylaxis against pulmonary embolism. Until such evidence is developed, temporary IVC filters should be implanted based on best available evidence and routinely removed within the guidelines of the FDA of 25-54 days. A fair question at this point is whether the design features themselves that are required to manufacture a low profile removable IVC filter can achieve effective prophylaxis against pulmonary embolism at a low rate of short and long-term complications. PMID:27012891

  10. Percutaneous placement of bird's nest inferior vena cava filter

    International Nuclear Information System (INIS)

    To describe clinical experiences of the use of Bird's Nest inferior vena cava(IVC) filter. Between August 1991 and August 1997, IVC filter was percutaneously inserted in 51 patients with pulmonary embolism(PE) and deep vein thrombosis of the lower extremities. Indications for the placement of this filter were contraindication to anticoagulation in 17 patients, prophylaxis of PE in 17, failed anticoagulation in 11, massive PE with residual floating thrombus in three and complications involving anticoagulation in 3. In order to delineate the location of renal vein and extension of deep vein thrombosis into the IVC, all patients under went inferior vena cavography before filter placement. Thirty filters were inserted through the right femoral vein, 19 through the right internal jugular vein and three through the left femoral vein. The patients involved were followed up for periods ranging from one week to six years (mean 10 months). A Bird's Nest IVC filter was placed in the infrarenal IVC in 44 patients and in the suprarenal IVC in 7. Certain complicatioins ensued. IVC penetration occurred in three patients(5.9%), and in seven(1.37%) the filter wire prolapsed. Except for transient pain, however, there were no serious IVC penetration-related complications and no evidence of recurrence of PE in the cases involving prolapse of the filter wire. During follow up, clinically suspected recurrent PE was noted in two patients(3.9%), but there was no evidence of newly developed occlusion of the IVC. In patients who under went follow up, Bird's Nest IVC filter effectively prevented the development and recurrence of PE, and there were no complications. To prevent of penetration of the IVC and prolapse of the filter, however, technical skill was needed

  11. Determinants of survival after inferior vena cava trauma.

    Science.gov (United States)

    Kuehne, J; Frankhouse, J; Modrall, G; Golshani, S; Aziz, I; Demetriades, D; Yellin, A E

    1999-10-01

    Inferior vena cava (IVC) injuries continue to be associated with mortality rates of 21 to 66 per cent despite advances in prehospital, surgical, and critical care. The purpose of this study was to evaluate outcome of patients with IVC injury after treatment at a major urban trauma center and to identify factors predictive of survival. Between 1989 and 1995, 158 patients presented to the Los Angeles County + University of Southern California Medical Center with IVC injuries. One hundred thirty-six patient records were available for review, and 69 data points were collected and analyzed. Mean age was 26 years (range, 6-54), and 122 (90%) patients were male. Mechanism of injury included gunshot in 88 (65%) patients, stab in 23 (17%) patients, shotgun in 7 (5%) patients, and blunt trauma in 18 (13%) patients. The mean Injury Severity Score was 25. Seventy (52%) patients were hypotensive. Eleven (8%) patients died before surgical intervention, and 25 (18%) patients died before operative repair. Repair (79), ligation (20), or observation (1) was accomplished in 100 (74%) patients. Overall survival was 48 per cent and 65 per cent in the 100 patients surviving to operative repair, including 5 of 20 patients requiring IVC ligation. Significant differences (Pthoracotomy, blood loss, level of injury, tamponade, and associated aortic injury. Logistic regression analysis identified hypotension, anatomic level of injury, and associated aortic injury as significant predictors of outcome (P = 0.001). Survival is predominantly determined by severity and anatomic accessibility of the IVC injury and by the absence of associated major vascular injuries. Ligation may control otherwise exsanguinating injuries and should be considered early in the management of complex injuries. PMID:10515547

  12. Design Optimization of Vena Cava Filters: An application to dual filtration devices

    Energy Technology Data Exchange (ETDEWEB)

    Singer, M A; Wang, S L; Diachin, D P

    2009-12-03

    Pulmonary embolism (PE) is a significant medical problem that results in over 300,000 fatalities per year. A common preventative treatment for PE is the insertion of a metallic filter into the inferior vena cava that traps thrombi before they reach the lungs. The goal of this work is to use methods of mathematical modeling and design optimization to determine the configuration of trapped thrombi that minimizes the hemodynamic disruption. The resulting configuration has implications for constructing an optimally designed vena cava filter. Computational fluid dynamics is coupled with a nonlinear optimization algorithm to determine the optimal configuration of trapped model thrombus in the inferior vena cava. The location and shape of the thrombus are parameterized, and an objective function, based on wall shear stresses, determines the worthiness of a given configuration. The methods are fully automated and demonstrate the capabilities of a design optimization framework that is broadly applicable. Changes to thrombus location and shape alter the velocity contours and wall shear stress profiles significantly. For vena cava filters that trap two thrombi simultaneously, the undesirable flow dynamics past one thrombus can be mitigated by leveraging the flow past the other thrombus. Streamlining the shape of thrombus trapped along the cava wall reduces the disruption to the flow, but increases the area exposed to abnormal wall shear stress. Computer-based design optimization is a useful tool for developing vena cava filters. Characterizing and parameterizing the design requirements and constraints is essential for constructing devices that address clinical complications. In addition, formulating a well-defined objective function that quantifies clinical risks and benefits is needed for designing devices that are clinically viable.

  13. Endovascular stenting for the management of port-a-cath associated superior vena cava syndrome.

    Science.gov (United States)

    Kostopoulou, Vasiliki; Tsiatas, Marinos L; Kelekis, Dimitrios A; Dimopoulos, Meletios-Athanasios; Papadimitriou, Christos A

    2009-03-01

    Port-a-cath systems are often essential for the administration of long-term chemotherapy in the treatment of malignancies because they improve venous access, but they are associated with complications, mainly thrombosis of central veins. In the present report, we describe a case of right subclavian and superior vena cava port-a-cath-related thrombosis causing superior vena cava syndrome (SVCS) in a patient affected by Hodgkin's disease. The patient underwent percutaneous revascularization with stent positioning, experiencing immediate relief of symptoms. Endovascular procedures for the treatment of nonmalignant SVCS seem to represent a challenging therapeutic option. PMID:18322718

  14. Advanced Hepatocellular Carcinoma with Subtotal Occlusion of the Inferior Vena Cava and a Right Atrial Mass

    Directory of Open Access Journals (Sweden)

    Christian Steinberg

    2013-01-01

    Full Text Available Hepatocellular carcinoma usually metastasizes to regional lymph nodes, lung, and bones but can rarely invade the inferior vena cava with intravascular extension to the right atrium. We present the case of a 75-year-old man who was admitted for generalized oedema and was found to have advanced HCC with invasion of the inferior vena cava and endovascular extension to the right atrium. In contrast to the great majority of hepatocellular carcinoma, which usually develops on the basis of liver cirrhosis due to identifiable risk factors, none of those factors were present in our patient.

  15. Huge Trombus including Left Renal Vein, Ovarian Vein, and Inferior Vena Cava Mimicking Renal Colic

    Directory of Open Access Journals (Sweden)

    Sakir Ongun

    2014-01-01

    Full Text Available A 31-year-old female presented with acute left flank pain; she had a C/S at the postpartum day 24. Ureteral stone was suspected but ultrasound examination was normal. Then Doppler ultrasound revealed a trombus in left renal vein and inferior vena cava. Contrast enhanced MDCT scan showed swelled and nonfunctional left kidney, a trombus including distal part of left ovarian vein, left renal vein, and inferior vena cava. We started anticoagulation treatment. Further examination revealed diagnosis of chronic myeloproliferative disease. The trombus was completely recanalized at 3-month followup.

  16. Surgical Management of Undiagnosed Laceration of Superior Vena Cava Caused by Blunt Trauma.

    Science.gov (United States)

    Bouabdallaoui, Nadia; Debbagh, Hassan; Schoell, Thibaut; Lebreton, Guillaume

    2016-05-01

    Intrapericardial rupture of the superior vena cava resulting from blunt thoracic trauma is a rare and life-threatening condition that has to be ruled out in the presence of signs of cardiac tamponade and a history of blunt thoracic trauma. We report the case of undiagnosed superior vena cava laceration caused by a high-speed road traffic accident in a 25 year-old patient revealed by cardiac tamponade. We highlight the need of urgent surgical exploration in all patients whose condition is unstable in the setting of blunt thoracic trauma regardless of imaging conclusions. PMID:27106431

  17. Surgical Management of Undiagnosed Laceration of Superior Vena Cava Caused by Blunt Trauma

    OpenAIRE

    Bouabdallaoui, Nadia; Debbagh, Hassan; Schoell, Thibaut; Lebreton, Guillaume

    2016-01-01

    International audience Intrapericardial rupture of the superior vena cava resulting from blunt thoracic trauma is a rare and life-threatening condition that has to be ruled out in the presence of signs of cardiac tamponade and a history of blunt thoracic trauma. We report the case of undiagnosed superior vena cava laceration caused by a high-speed road traffic accident in a 25 year-old patient revealed by cardiac tamponade. We highlight the need of urgent surgical exploration in all patien...

  18. Animal experimental study of safety for a self-made vena cava stent-filter

    International Nuclear Information System (INIS)

    Objective: To evaluate the safety of a self-made vena cava stent-filter(VCSF)for prevention of pulmonary embolism. Methods: Fusiform unmhrella-like vena cava filter was made of Nitinol wires and stainless steel metal pole, and then ten mongrel dogs were implanted with these self-made filters and divided into 5 groups according to the different periods (2, 3, 4, 5 and 6 w) of filter placement, with 2 dogs in each group. After the VCSFs were placed in inferior vena cava via the right femoral vein approach, the dogs in each group were bred for 2-6 weeks, respectively. The blood flow of inferior vena cava and the position of the filters were inspected by inferior vena-cavography according to the indwelling periods. Finally the metal pole was retrieved via the femoral vein, leaving the VCSF as permanent venousz stent. The feasibility of retrieval and the free state of filter net with the adhering vascular wall were evaluated. Laparotomies were performed to remove the inferior vena cava from the animals for gross and electron microscopic examinations of the inferior vena cava intimal changes of the involved segment. Results: All 10 VCSFs were placed at the right positions of the dogs successfully. Angiography showed patent inferior vena cava without filter thrombosis at 2-6 weeks. There were no tilting and migration of the filter and all the metal poles were successfully retrieved. The superior and inferior extremities of filter nets could be set free with all the filters turning into venous stents. Postmortem displayed retroperitoneal hemorrhage and caval thrombosis. The barbs of the filters penetrated over the caval adventitial coat. Under electron microscope, a thin layer of neointima already covered the braiding net of VCSFs at 2 weeks after the deployment. The tunica intima became slightly thick at 3-4 weeks and with moderate proliferation at 5-6 weeks. Conclusions: The self-made vena cava stent-filter possesses rather long indwelling period according to the

  19. Experiência preliminar com novo filtro de veia cava: resultados de 15 implantes Preliminary experience with a new vena cava filter: results of 15 implantations

    Directory of Open Access Journals (Sweden)

    Winston B. Yoshida

    2008-09-01

    Full Text Available Este estudo apresenta resultados preliminares obtidos com um novo filtro permanente de veia cava, baseado no desenho de Greenfield, com três hastes prolongadas de um total de seis, para dar estabilidade central ao filtro na luz da veia cava. Neste artigo, relatamos sua avaliação clínica preliminar quanto à aplicabilidade, eficácia e segurança. De agosto de 2004 a dezembro de 2006, 15 filtros foram implantados em nove homens e seis mulheres, com idades variando de 38 a 79 anos (média de 57,8 anos. O acesso foi feito sempre por via transjugular. As indicações foram: trombose venosa proximal, com contra-indicação de anticoagulação em 12 pacientes; complicações hemorrágicas com anticoagulação em dois pacientes; e embolia pulmonar, apesar de anticoagulação adequada, em um paciente. Os filtros foram avaliados quanto à liberação, inclinação, mau posicionamento e perfuração de cava. No seguimento, avaliou-se trombose no local de acesso, tromboembolismo venoso recorrente, migração do filtro e trombose de cava pelo ultra-som. Nenhum paciente recebeu anticoagulantes no seguimento. O filtro foi liberado com sucesso em todos os casos sem mau posicionamento, inclinação, perfuração ou trombose de acesso. Os pacientes foram seguidos entre 3 e 23 meses (média de 11 meses. Nenhum paciente teve recorrência de tromboembolismo venoso. Não houve casos de trombose de veia cava ou migração do filtro. Óbito ocorreu em sete casos, todos relacionados com a moléstia de base. Os resultados preliminares indicam potencial eficácia e segurança do uso do novo filtro no período estudado.This study presents preliminary results obtained from a new permanent filter, based on Greenfield's filter design, with prolongations on three of six struts to stabilize it centrally in the vena caval lumen. The preliminary clinical evaluation of the filter with regard to feasibility, efficacy and safety is reported. From August 2004 to December 2006

  20. 含负荷不平衡补偿的SVC复合控制方法研究%The Composite Control Method Research of the SVC with Unbalanced Load Compensation

    Institute of Scientific and Technical Information of China (English)

    李慧

    2012-01-01

    该文提出了一种通过加装带滤波器的静止无功补偿器(SVC),使负序引起的不平衡功率和谐波功率流入SVC,最终达到平衡系统目的的方法;提出基于前馈-反馈复合控制的SVC不平衡负荷补偿方法,将电压闭环控制与三相不平衡控制相结合、功率因数闭环控制与三相不平衡控制相结合,以达到适应各种工况的需求。最后,该文在SVC相关理论研究的基础上搭建了仿真模型,仿真结果表明该文提出控制方法的正确性和可行性。%Based on the analysis of three-phase unbalanced system's instantaneous power,this paper proposes a method that by installing SVC compensator with a filter to make the imbalance power caused by negative sequence and harmonic power flowing into the SVC and achieve the ultimate objective of a balanced system.A feedforward-feedback composite control method on the unbalanced load compensation of SVC is also given in this paper,which take the voltage loop control and three-phase unbalance control integrated as well as make power factor loop combining with the three-phase unbalanced control.It is proved that this method can meet the needs of various working conditions.The simulation model is built based on the SVC theory,simulation results show that this control method is correct and feasible.

  1. White matter change on CT associated with superior vena cava syndrome: a case report

    International Nuclear Information System (INIS)

    An 11-year-old Japanese girl with nephrotic syndrome developed superior vena cava syndrome associated with hypercoagulability and an indwelling catheter. Cranial CT revealed diffuse low-density lesions in paraventricular white matter. Thrombectomy brought prompt relief of symptoms and correction of CT abnormalities. (orig.)

  2. Cardiac Metastasis from Invasive Thymoma Via the Superior Vena Cava: Cardiac MRI Findings

    International Nuclear Information System (INIS)

    Cardiac tumors are rare, and metastatic deposits are more common than primary cardiac tumors. We present cardiac magnetic resonance imaging (MRI) findings of a 50-year-old woman with invasive thymoma. Cardiac MRI revealed a heterogeneous, lobulated anterior mediastinal mass invading the superior vena cava and extending to the right atrium. In cine images there was no invasion to the right atrial wall.

  3. Thrombosis caused by polyurethane double-lumen subclavian superior vena cava catheter and hemodialysis

    DEFF Research Database (Denmark)

    Wanscher, Maria Rørbæk; Frifelt, J J; Smith-Sivertsen, C;

    1988-01-01

    During an 18-month period, 82 consecutive patients (37 women and 45 men), with a mean age of 50 yr (range 15 to 74), underwent hemodialysis with 91 polyurethane double-lumen subclavian superior vena cava catheters inserted via the right subclavian vein. Upon catheter removal, venograms were...

  4. Superior Vena Cava Syndrome: A Presenting Feature of Mediastinal Germ Cell Tumor

    Directory of Open Access Journals (Sweden)

    Mahua Roy

    2010-04-01

    Full Text Available Superior vena cava syndrome (SVCS is rare in children. Non-Hodgkin’s Lymphoma (NHL is the most common cause of SVCS in children. This report an adolescent male who presented with SVCS due to mixed germ cell tumor (GCT of the anterior mediastinum with predominant yolk cell component. Such etiology of SVCS is rarely reported.

  5. White matter change on CT associated with superior vena cava syndrome: a case report

    Energy Technology Data Exchange (ETDEWEB)

    Fukuda, M. (Department of Nephrology, Metropolitan Kiyose Children' s Hospital, Tokyo (Japan)); Nagai, T. (Department of Neurology, Metropolitan Kiyose Children' s Hospital, Tokyo (Japan)); Kamiyama, Y. (Department of Nephrology, Metropolitan Kiyose Children' s Hospital, Tokyo (Japan)); Kawamura, K. (Department of Nephrology, Metropolitan Kiyose Children' s Hospital, Tokyo (Japan)); Kawahara, K. (Department of Nephrology, Metropolitan Kiyose Children' s Hospital, Tokyo (Japan)); Honda, M. (Department of Nephrology, Metropolitan Kiyose Children' s Hospital, Tokyo (Japan))

    1993-03-01

    An 11-year-old Japanese girl with nephrotic syndrome developed superior vena cava syndrome associated with hypercoagulability and an indwelling catheter. Cranial CT revealed diffuse low-density lesions in paraventricular white matter. Thrombectomy brought prompt relief of symptoms and correction of CT abnormalities. (orig.)

  6. Kirurgisk radikal resektion af leiomyosarkom i retrohepatiske vena cava med intrakardial tumortrombosering

    DEFF Research Database (Denmark)

    Arendrup, Henrik C; Larsen, Peter Nørgaard; Rasmussen, Allan; Pedersen, Christian Ross

    2005-01-01

    1 x 1 cm in the wall of the vena cava while the intracaval tumour was 12 cm long with a diameter of 5 cm and 1.5 cm in the right atrium. Using venovenous bypass with circulatory support, the tumour was excised in toto and the caval vein closed with a pericardial patch. The patient was discharged in...

  7. The clinical application of the implantation of retrievable filters in superior vena cava

    International Nuclear Information System (INIS)

    Objective: To investigate the safety of the placement of Tulip retrievable filter in superior vena cava and to discuss the prevention of pulmonary embolism (PE). Methods: Implantation of Tulip retrievable filter in superior vena cava was performed in ten patients (6 males and 4 females, aged 42-60 years) with acute or subacute deep venous thrombosis in upper extremity or cephalo-cervical region. After the placement of filter, the local via-catheter thrombolysis was conducted. The clinical results, such as the improvement of venous obstructed symptoms at upper extremity or cephalo-cervical region, were recorded. The filter's shape and location were checked. The possible occurrence of pulmonary embolism was observed. Results: The filter was successfully implanted in supper vena cava in all patients, and the deep venous thrombosis at upper extremity and cephalo-cervical region responded well to the local via-catheter thrombolysis. The filters showed no displacement or tilting. The swelling at upper extremity and cephalo-cervical region was markedly faded away. No symptomatic pulmonary embolism occurred. the filter was successfully retrieved via the femoral vein in four patients. Conclusion: Tulip filter can be safety implanted in superior vena cava and can be smoothly retrieved. The occurrence of pulmonary embolism can be effectively prevented if corresponding local via-catheter thrombolysis is carried out. (authors)

  8. Superior Vena Cava Syndrome: A Presenting Feature of Mediastinal Germ Cell Tumor

    OpenAIRE

    Mahua Roy; Rajat Bandyopadhyay; Narayan Pandit; Soumita Sengupta

    2010-01-01

    Superior vena cava syndrome (SVCS) is rare in children. Non-Hodgkin’s Lymphoma (NHL) is the most common cause of SVCS in children. This report an adolescent male who presented with SVCS due to mixed germ cell tumor (GCT) of the anterior mediastinum with predominant yolk cell component. Such etiology of SVCS is rarely reported.

  9. Superior vena cava obstruction in small-cell lung cancer

    International Nuclear Information System (INIS)

    Purpose: To identify prognostic or treatment factors influencing the response of superior vena cava obstruction (SVCO), time to SVCO recurrence, and overall survival of SCLC patients with SVCO at presentation; and to assess the role of retreatment in patients with SVCO at recurrent or persistent disease. Methods and Materials: Between January 1983 and November 1993, 76 consecutive patients who had small-cell lung cancer (SCLC) with SVCO were treated in our institution. Analysis was done according to the disease status at diagnosis of SVCO. The first analysis concerned a group of 50 patients who had SVCO at initial presentation. The second analysis concerned a group who had SVCO as a manifestation of persistent or recurrent disease. Results: In the first analysis, 93% had significant improvement in symptoms of SVCO after chemotherapy and 94% after mediastinal radiation. Response is almost universal despite a wide range of radiation fractionation and total dose used. Seventy percent remained SVCO-free before death. Thirty percent developed recurrence of SVCO symptoms 1-16 months (median 8) after the start of initial treatment. Those who received combined chemotherapy and radiation had a longer time to SVCO recurrence (p = 0.018) compared to those who received chemotherapy alone. This effect is mainly seen in limited-stage patients. The presence of SVCO recurrence tends to have an adverse effect on the overall survival (p = 0.077) irrespective of the time when the recurrences occurred (p = 0.296). The median survival of this whole group of 50 patients in the first analysis was 9.5 months, and the 2-year survival was 10%. Stage was strongly predictive of survival (p < 0.001). Sixteen percent (3 of 19) of the patients with limited-stage diseases were long-term survivors (two patients survived 35 months and one survived 70 months). The early mortality from SVCO was 2%. In the second analysis, 85% had previously been treated with chemotherapy alone. The response rate of

  10. Long-term follow-up of protection efficacy of vena cava filters in the prevention of pulmonary embolism

    International Nuclear Information System (INIS)

    Objective: To analyze the protection efficacy of the vena cava filter from pulmonary thromboembolism and report the problems and complications after filter placement. Methods: Fifty-five Vena Tech-LGM filters (VTF) and 6 Titanium-Greenfield filters (TGF) were placed in 61 patients. Follow-up was obtained by means of duplex sonography of the inferior vena cava and abdominal radiography in 38 patients, and by means of computed tomography in 11 patients. Results: One case of pulmonary embolism was seen following filter placement. Filter thrombosis occurred in 9 cases. There had been 1 case of incomplete filter opening and one case of filter tilting. Filter migration was noted in 1 case. Conclusion: This experience suggests that vena cava filter is safe and effective for the prevention of pulmonary embolism. A vena cava filter should only be inserted in a patient when there is strict proof of the indication

  11. Percutaneous transfemoral placement of inferior vena cava filter to prevent pulmonary embolism in patients with malignant tumor

    International Nuclear Information System (INIS)

    Objective: To evaluate the effectiveness and safety of inserting an inferior vena cava filter to prevent the pulmonary embolism (PE) due to detachment of the thrombus in the lower extremities. Methods: Inferior vena cava filter were placed in 37 patients with malignant tumor and deep venous thrombosis from 1998 to 2004. Malignancy was confirmed by pathological or cellular biological examination in all cases. The episode of pulmonary embolism was monitored during a post-intervention follow-up. Results: All the filters were placed in the inferior vena cava safely via a percutaneous femoral venous access. No serious complications such as pulmonary embolism occurred during the follow-up periods. Conclusion: The inferior vena cava filter placement is an effective and safe procedure in preventing the pulmonary embolism in patients with malignant tumor and deep venous thrombosis. (authors)

  12. [Duplication of the superior vena cava and other malformations discovered at insertion of a port-a-cath].

    Science.gov (United States)

    Hammerer, V; Jeung, M; Mennecier, B; Demian, M; Pauli, G; Quoix, E

    2005-09-01

    We report a clinical case of a persistent left superior vena cava discovered in a 50-year-old female patient when a port-a-cath was inserted. This already seldom malformation was associated with an arteria lusoria and polysplenia with left inferior vena cava with hemiazygos continuation, right-sided stomach, short pancreas, preduodenal portal vein and intestinal malrotation, but without any cardiac abnormalities. PMID:16208194

  13. Estimation of Right Atrial Pressure from the Inspiratory Collapse of the Inferior Vena cava in Pediatric Patients

    OpenAIRE

    Gholamhossein Ajami; Khobiar Zare; Hamid Amoozgar; Mohammad Borzoee; Saeed Abtahi

    2010-01-01

    Objective: Paucity of data exists between mean right atrial pressure (RAP) and inferior vena cava (IVC) size and collapsibility in pediatric patients with congenital heart disease.Methods: In a prospective study, fifty consecutive pediatric patients with different congenital heart diseases who had right side cardiac catheterization were studied, comparing right atrial pressure with simultaneous M-mode echocardiographic measurement of inferior vena cava diameter. Mean age of the patients was 4...

  14. Ultrasonographic assessment of inferior vena cava/abdominal aorta diameter index: a new approach of assessing hypovolemic shock class 1

    OpenAIRE

    Rahman, Nik Hisamuddin NA; Ahmad, Rashidi; Kareem, Meera Mohaideen; Mohammed, Mohammad Iqhbal

    2016-01-01

    Background We designed this study to expand the usage of ultrasound to detect early occurrence of hypovolemia. We explore the potential use of inferior vena cava (IVC) and abdominal aorta (AA) diameter index (IVC:AA) measured ultrasonographically to detect class 1 hypovolemic shock with blood loss less than 15%.ᅟ Methods The aim of this study was to determine the changes in the diameter of inferior vena cava and abdominal aorta in blood donors by using ultrasound, pre and post blood donation....

  15. Congenital inferior vena cava anomalies: a review of findings at multidetector computed tomography and magnetic resonance imaging

    Energy Technology Data Exchange (ETDEWEB)

    Yang, Catherine; Trad, Clovis Simao [Central de Diagnostico Ribeirao Preto (CEDIRP), SP (Brazil); Trad, Henrique Simao, E-mail: hstrad@terra.com.br [Central de Diagnostico Ribeirao Preto (CEDIRP), SP (Brazil); Universidade de Sao Paulo (HC-FMRPUSP), Ribeirao Preto, SP (Brazil). Fac. de Medicina. Hospital das Clinicas; Mendonca, Silvana Machado [Clinica de Diagnostico por Imagem (CDPI), Rio de Janeiro, RJ (Brazil)

    2013-06-15

    Inferior vena cava anomalies are rare, occurring in up to 8.7% of the population, as left renal vein anomalies are considered. The inferior vena cava develops from the sixth to the eighth gestational weeks, originating from three paired embryonic veins, namely the subcardinal, supracardinal and postcardinal veins. This complex ontogenesis of the inferior vena cava, with multiple anastomoses between the pairs of embryonic veins, leads to a number of anatomic variations in the venous return from the abdomen and lower limbs. Some of such variations have significant clinical and surgical implications related to other cardiovascular anomalies and in some cases associated with venous thrombosis of lower limbs, particularly in young adults. The authors reviewed images of ten patients with inferior vena cava anomalies, three of them with deep venous thrombosis. The authors highlight the major findings of inferior vena cava anomalies at multidetector computed tomography and magnetic resonance imaging, correlating them the embryonic development and demonstrating the main alternative pathways for venous drainage. The knowledge on the inferior vena cava anomalies is critical in the assessment of abdominal images to avoid misdiagnosis and to indicate the possibility of associated anomalies, besides clinical and surgical implications. (author)

  16. SVC与TCSC优化配置在电力系统静态电压稳定中的应用%Application of SVC and TCSC Optimal Configuration in Static Voltage Stability of Power System

    Institute of Scientific and Technical Information of China (English)

    李娟; 许欣; 李壮; 庄海军; 齐永志; 高松

    2016-01-01

    In order to improve stability of static voltage of the power system,it is proposed to combine static var compensator (SVC)with thyristor controlled series compensator (TCSC)in power system lines and use dynamic continuous trend method for calculating static voltage stability margin of the power system.Firstly,steady state model for SVC and TCSC is construc-ted,concepts of node parameter factor and branch parameter factor are introduced and modal analysis method is used to de-termine vulnerabilities of system busbar and branches.In addition,parallel SVC is adopted for reactive power compensation for weak spots of busbar,series TCSC is used for optimizing power distribution of weak lines and dynamic continuous trend method is applied to work out static voltage stability margin.IEEE-1 4 node system is used for simulating calculation,and static voltage stability margin values of device without flexible alternative current transmission system (FACTS),single in-stallation of SVC or TCSC,combined installation of SVC and TCSC are compared.Results indicate the proposed new meth-od is able to quickly and correctly improve static voltage stability of the power system.%为提高电力系统静态电压的稳定性,提出将静止无功补偿器(static var compensator,SVC)与可控串联补偿装置(thyristor controlled series compensator,TCSC)相结合并作用于电力系统线路中,运用动态连续潮流法计算电力系统静态电压稳定裕度的新方法。首先建立SVC与TCSC的稳态模型;然后引入节点参数因子和支路参数因子的概念,运用模态分析法确定系统母线和支路的薄弱点,并联 SVC 对母线薄弱点进行无功补偿,串联TCSC优化薄弱线路功率分配;最后运用动态连续潮流法求出静态电压稳定裕度。以 IEEE-14节点系统进行仿真计算,并对无灵活交流输电(flexible AC transmission system,FACTS)装置、单独安装 SVC 或 TCSC、SVC和TCSC相结合情况下的系统静态电压稳

  17. [Bilateral deep venous thrombosis and vena cava aplasia treated with local thrombolysis

    DEFF Research Database (Denmark)

    Pelta, A.M.; Jørgensen, Maja; Just, Sven Richardt Lundgren; Jensen, Leif Pandora

    2008-01-01

    In this case report the treatment of a young man with bilateral iliaco-femoral DVT and vena cava aplasia is presented. The patient was treated with catheter-directed thrombolysis; the catheters were introduced in the thrombus of both legs via v. popliteae. The treatment led to almost complete thr...... thrombus resolution and no valvular incompetence at three months follow-up. In our opinion this treatment should be offered even in complex cases of acute proximal deep venous thrombosis Udgivelsesdato: 2008/5/19......In this case report the treatment of a young man with bilateral iliaco-femoral DVT and vena cava aplasia is presented. The patient was treated with catheter-directed thrombolysis; the catheters were introduced in the thrombus of both legs via v. popliteae. The treatment led to almost complete...

  18. Persistent Left Superior Vena Cava: A Rare Case with Clinical Significance

    Science.gov (United States)

    Kumar, Raj; Yadav, Sankalp; Verma, Deepak

    2016-01-01

    Persistent Left Superior Vena Cava (PLSVC) is a rare congenital vascular anomaly (incidence of 0.3-0.5% of the general population) which being mostly asymptomatic in its presentation, is usually detected incidentally. There are many practical clinical implications associated with it including arrhythmias. We report a rare case of PLSVC with absent Right Superior Vena Cava (RSVC) (isolated PLSVC), in a 55-year-old lady who had complete heart block followed by sepsis and was diagnosed to have this condition during the permanent cardiac pacemaker implantation and central venous catheter insertion showing an abnormal path of the catheter/pacing leads. The authors also give an insight into its clinical relevance. PMID:27437282

  19. Superior vena cava syndrome from an invasive thymoma with transcaval invasion to the right atrium.

    Science.gov (United States)

    Afzal, Ashwad; Wong, Ivan; Korniyenko, Aleksandr; Ivanov, Alex; Worku, Berhane; Gulkarov, Iosif

    2016-01-01

    Invasive thymoma with transcaval extension to the right atrium is a rare cause of superior vena cava syndrome. We present a case on a 74-year-old female presenting with dyspnea on exertion, and facial and upper extremity swelling. Physical examination revealed mild facial swelling, non-pitting edema involving the upper extremities and distention of superficial veins of the anterior chest wall and jugular veins. An echocardiogram showed moderate right atrial dilation with a mobile mass in the atrial cavity prolapsing through the tricuspid valve. Cardiac magnetic resonance imaging revealed a 9.9 × 4.3 cm heterogeneous mass in the anterior mediastinum compressing the superior vena cava and endovenously extending into the right atrium. Tissue biopsy of the mediastinal mass revealed a type B1 thymoma, further staged as a Masaoka IVa invasive thymoma that underwent successfulen blocresection followed by removal of intracaval and right atrial mass. PMID:27099229

  20. Fat collections related to the intrahepatic inferior vena cava: CT features

    International Nuclear Information System (INIS)

    Purpose: To evaluate fat collections related to inferior vena cava, their causes, and to make a review of the literature about these benign incidental findings. Materials and Methods: Two thousands and one hundred thoracoabdominal CT scans were performed between May 2000 and March 2001. We used a PQ 5000 spiral CT scanner. The studies were performed with and without contrast media. Results: We found three cases of fat collections related to inferior vena cava (IVC). They were located posteromedial and anteromedial to IVC. Conclusion: Fat collections related to the IVC are benign incidental findings. The knowledge with regards to these findings should preclude erroneous diagnosis of intracaval thrombus, intracaval lipomas or secondary extensions of tumors. (author)

  1. Agenesis of Ductus Venosus Presenting with Dilated Inferior Vena Cava with Favorable Outcome

    Directory of Open Access Journals (Sweden)

    Omer Dai

    2014-04-01

    Full Text Available The ductus venosus regulates the distribution of oxygen and placental nutrients by restricting the centralization of blood flow in fetal circulation. The ductus venosus is a small vein transmitting oxygen-rich blood from the umbilical vein to the fetal heart.. Increasing numbers of case reports are being published about ductus venosus agenesis with cardiac structural abnormalities, other malformations, chromosomal abnormalities, and stillbirth. Heart failure, hydrops and unexplained polyhydramnios could also be associated with ductus venosus agenesis. In the follow-up of fetuses with ductus venosus agenesis, care must be taken to examine for hydrops and heart failure. The agenesis of ductus venosus is often only found in fetuses by coincidentally. Herein we discuss the prenatal diagnosis of isolated agenesis of the ductus venosus presenting with a dilated inferior vena cava and without any disturbance of fetal hemodynamics and any other malformation. In conclusion a dilated inferior vena cava can be a sign of ductus venosus agenesia.

  2. Totally endoscopic robotic resection of left atrial myxoma with persistent left superior vena cava.

    Science.gov (United States)

    Tarui, Tatsuya; Ishikawa, Norihiko; Ohtake, Hiroshi; Watanabe, Go

    2016-07-01

    A 68-year old man with a cardiac tumour was admitted for robotic tumour resection using the da Vinci S Surgical System. While undergoing preoperative examination, he was found to have a persistent left superior vena cava. After general anaesthesia and single-lung ventilation, cardiopulmonary bypass was established, with venous drainage through bilateral internal jugular and right femoral veins and arterial return through the right femoral artery. Robotic tumour resection was performed by four ports in the right chest. There were no difficulties during the operation, and successful tumour resection was achieved with satisfactory margins. He was discharged without complications. Persistent left superior vena cava is very rare, but if diagnosed preoperatively and an appropriate operative plan is made, robotic cardiac surgery can be performed safely. With robotic surgery, cardiac tumour resection can be feasibly performed, with cosmetic benefits. PMID:26989070

  3. The CAVA corpus: synchronised stereoscopic and binaural datasets with head movements

    OpenAIRE

    Arnaud, Elise; Christensen, Heidi; Lu, Yan-Chen; Barker, Jon; Khalidov, Vasil; Hansard, Miles; Holveck, Bertrand; Mathieu, Herve; Narasimha, Ramya; Taillant, Elise; Forbes, Florence; Horaud, Radu

    2008-01-01

    International audience This paper describes the acquisition and content of a new multi-modal database. Some tools for making use of the data streams are also presented. The Computational Audio- Visual Analysis (CAVA) database is a unique collection of three synchronised data streams obtained from a binaural microphone pair, a stereoscopic camera pair and a head tracking device. All recordings are made from the perspective of a person; i.e. what would a human with natural head movements see...

  4. Bullet embolisation from injured inferior cava vein to the right ventricle

    OpenAIRE

    Zenelaj, A; M Brati; Kerci, M

    2010-01-01

    Gunshot injuries of the human body challenge surgical teams in the emergency department. Since such injuries do not follow any rule, every patient should be considered a special case. Our case, of bullet embolism from injured inferior cava vein to the right heart ventricle is a rare one. Such cases make us be more alert for diagnosis and treatment of this kind of injury. Well equipped hospitals and experienced medical teams are necessary for successful outcome.

  5. A sulfated polysaccharide of Ecklonia cava inhibits the growth of colon cancer cells by inducing apoptosis

    OpenAIRE

    Ahna, Ginnae; Lee, WonWoo; Kim, Kil-Nam; Lee, Ji-Hyeok; Heo, Soo-Jin; Kang, Nalae; Lee, Seung-Hong; Ahnf, Chang-Bum; Jeon, You-Jin

    2015-01-01

    We investigated anticancer effects of the crude polysaccharides (CPs) isolated from Ecklonia cava enzymatic extracts using AMG, Viscozyme, Protamex, and Alcalase enzyme against a colon cancer cell line, CT26 cells. Among them, the CP of Protamex extract (PCP) contained the highest fucose and sulfated group contents and showed the highest growth inhibitory effect against CT-26 cells. In addition, PCP dose-dependently increased the formation of apoptotic body and the percentage of Sub-G1 DNA co...

  6. Ecklonia cava Inhibits Glucose Absorption and Stimulates Insulin Secretion in Streptozotocin-Induced Diabetic Mice

    OpenAIRE

    Hye Kyung Kim

    2012-01-01

    Aims of study. Present study investigated the effect of Ecklonia cava (EC) on intestinal glucose uptake and insulin secretion. Materials and methods. Intestinal Na+-dependent glucose uptake (SGU) and Na+-dependent glucose transporter 1 (SGLT1) protein expression was determined using brush border membrane vesicles (BBMVs). Glucose-induced insulin secretion was examined in pancreatic β-islet cells. The antihyperglycemic effects of EC, SGU, and SGLT1 expression were determined in streptozotocin ...

  7. Cement Embolus Trapped in the Inferior Vena Cava Filter during Percutaneous Vertebroplasty

    OpenAIRE

    Li, Zhi; Ni, Rui-fang; Zhao, Xin; Yang, Chao; Li, Ming-Ming

    2013-01-01

    A 58-year-old female patient, diagnosed with adenocarcinoma of the lung, underwent percutaneous vertebroplasty at the L4 vertebral body due to painful spinal metastases. Because of deep venous thrombosis of the left femoral and iliac veins, an inferior vena cava filter had been placed before vertebroplasty. Bone cement migrated into the venous bloodstream and then was being trapped within the previously placed filter. This case illustrates that caval filter could capture the bone cement and p...

  8. Corylucinine, a new Alkaloid from Corydalis cava (Fumariaceae), and its Cholinesterase Activity

    Czech Academy of Sciences Publication Activity Database

    Novák, Z.; Chlebek, J.; Opletal, L.; Jiroš, Pavel; Macáková, K.; Kuneš, J.; Cahlíková, L.

    2012-01-01

    Roč. 7, č. 7 (2012), s. 859-860. ISSN 1934-578X Grant ostatní: SVV UK(CZ) 265002; SVV UK(CZ) 265001; FRVŠ(CZ) 664/2011; UNCE UK(CZ) 17/2012/ Institutional research plan: CEZ:AV0Z40550506 Keywords : Corydalis cava * corylucinine * 8-trichloromethyl-7,8-dihydropalmatine * acetylcholinesterase * butyrylcholinesterase * Alzheimer's disease Subject RIV: CC - Organic Chemistry Impact factor: 0.956, year: 2012

  9. Dilated coronary sinus in a dog with persistent left cranial vena cava

    International Nuclear Information System (INIS)

    This paper describes the electrocardiographic, echocardiographic (two-dimensional, M-mode, contrast and Doppler) and non-selective angiocardiographic features in a 3 year old female Beagle with dilated coronary sinus due to persistent left cranial vena cava. Negative P waves in leads III and aVR and a positive P wave in lead aVL were seen, Echocardiographically, a hipoechoic circular structure was seen between the left atrium and the pericardium in the area where the coronary sinus islocated, A velocity pattern with two peaks was obtained, one systolicwith velocity = 0.44 +/- 0.05 m/sec and the other diastolic with velocity = 0.27 +/- 0.01 m/sec, By M-mode echocardiography, at level of the aorta and the left atrium, a linear structure was identified betweenthe left atrium and the pericardium; this structure was characterizedby phasic movements of the anterior wall during the cardiac cycle, Following a left cephalic vein injection of saline, bubbles were seen within the coronary sinus; when saline was injected into the right cephalic vein, bubbles were also seen within the coronary sinus and right atrium and ventricle, Non-selective angiocardiography confirmed a dilated coronary sinus with persistent left cranial vena cava, The right cranial vena cava was absent, The dog was clinically normal and the unusual vessel was an incidental finding

  10. Safety and Efficacy of the Gunther Tulip Retrievable Vena Cava Filter: Midterm Outcomes

    Energy Technology Data Exchange (ETDEWEB)

    Hoffer, Eric K., E-mail: eric.k.hoffer@hitchcock.org; Mueller, Rebecca J.; Luciano, Marcus R.; Lee, Nicole N.; Michaels, Anne T.; Gemery, John M. [Dartmouth-Hitchcock Medical Center, Department of Radiology, Section of Vascular and Interventional Radiology (United States)

    2013-08-01

    PurposeTo evaluate of the medium-term integrity, efficacy, and complication rate associated with the Gunther Tulip vena cava filter.MethodsA retrospective study was performed of 369 consecutive patients who had infrarenal Gunther Tulip inferior vena cava filters placed over a 5-year period. The mean patient age was 61.8 years, and 59 % were men. Venous thromboembolic disease and a contraindication to or complication of anticoagulation were the indications for filter placement in 86 % of patients; 14 % were placed for prophylaxis in patients with a mean of 2.3 risk factors. Follow-up was obtained by review of medical and radiologic records.ResultsMean clinical follow-up was 780 days. New or recurrent pulmonary embolus occurred in 12 patients (3.3 %). New or recurrent deep-vein thrombosis occurred in 53 patients (14.4 %). There were no symptomatic fractures, migrations, or caval perforations. Imaging follow-up in 287 patients (77.8 %) at a mean of 731 days revealed a single (0.3 %) asymptomatic fracture, migration greater than 2 cm in 36 patients (12.5 %), and no case of embolization. Of 122 patients with CT scans, asymptomatic perforations were identified in 53 patients (43.4 %) at a mean 757 days.ConclusionThe Gunther Tulip filter was safe and effective at 2-year follow-up. Complication rates were similar to those reported for permanent inferior vena cava filters.

  11. Safety and Efficacy of the Gunther Tulip Retrievable Vena Cava Filter: Midterm Outcomes

    International Nuclear Information System (INIS)

    PurposeTo evaluate of the medium-term integrity, efficacy, and complication rate associated with the Gunther Tulip vena cava filter.MethodsA retrospective study was performed of 369 consecutive patients who had infrarenal Gunther Tulip inferior vena cava filters placed over a 5-year period. The mean patient age was 61.8 years, and 59 % were men. Venous thromboembolic disease and a contraindication to or complication of anticoagulation were the indications for filter placement in 86 % of patients; 14 % were placed for prophylaxis in patients with a mean of 2.3 risk factors. Follow-up was obtained by review of medical and radiologic records.ResultsMean clinical follow-up was 780 days. New or recurrent pulmonary embolus occurred in 12 patients (3.3 %). New or recurrent deep-vein thrombosis occurred in 53 patients (14.4 %). There were no symptomatic fractures, migrations, or caval perforations. Imaging follow-up in 287 patients (77.8 %) at a mean of 731 days revealed a single (0.3 %) asymptomatic fracture, migration greater than 2 cm in 36 patients (12.5 %), and no case of embolization. Of 122 patients with CT scans, asymptomatic perforations were identified in 53 patients (43.4 %) at a mean 757 days.ConclusionThe Gunther Tulip filter was safe and effective at 2-year follow-up. Complication rates were similar to those reported for permanent inferior vena cava filters

  12. Penile reconstruction

    OpenAIRE

    Garaffa, Giulio; Sansalone, Salvatore; Ralph, David J.

    2012-01-01

    During the most recent years, a variety of new techniques of penile reconstruction have been described in the literature. This paper focuses on the most recent advances in male genital reconstruction after trauma, excision of benign and malignant disease, in gender reassignment surgery and aphallia with emphasis on surgical technique, cosmetic and functional outcome.

  13. Penile reconstruction

    Institute of Scientific and Technical Information of China (English)

    Giulio Garaffa; Salvatore Sansalone; David J Ralph

    2013-01-01

    During the most recent years,a variety of new techniques of penile reconstruction have been described in the literature.This paper focuses on the most recent advances in male genital reconstruction after trauma,excision of benign and malignant disease,in gender reassignment surgery and aphallia with emphasis on surgical technique,cosmetic and functional outcome.

  14. Pseudoaneurisma de aorta como causa de síndrome da veia cava superior: relato de caso Aortic pseudoaneurysm as cause of superior vena cava syndrome: a case report

    Directory of Open Access Journals (Sweden)

    Katsuro Harada Júnior

    2012-09-01

    Full Text Available A síndrome da veia cava superior representa o conjunto de sinais e sintomas decorrentes da sua obstrução. A síndrome tem como principais etiologias tumores malignos, como o carcinoma broncogênico, o linfoma e a metástase mediastinal. O câncer de pulmão é responsável por 80% dos casos, os linfomas mediastinais por 15%, e 5% correspondem às demais causas. Este relato de caso objetiva apresentar um caso incomum dessa síndrome, ocorrido em um paciente do sexo masculino após ferimento penetrante no tórax, resultando em pseudoaneurisma de arco aórtico e a síndrome da veia cava superior.The superior vena cava syndrome represents the set of signs and symptoms resulting from obstruction of superior vena cava. The syndrome has as main causes malignant tumors such as bronchogenic carcinoma, lymphoma and mediastinal metastases. Lung cancer accounts for 80% of cases, mediastinal lymphomas by 15% and 5% correspond to other causes. This case report aims to present an unusual case of this syndrome, which occurred in a male patient after penetrating wound in the chest, which developed a pseudoaneurysm of the aortic arch and superior vena cava syndrome.

  15. Fístula axilo-cava para hemodiálise: relato de caso Axillary arteriovenous fistula for hemodialysis: case report

    Directory of Open Access Journals (Sweden)

    Yosio Nagato

    2009-12-01

    Full Text Available Na confecção de fístula arteriovenosa (FAV para hemodiálise, condutos venosos autógenos demonstram performance superior quando comparados com material protético em relação à perviedade primária ou secundária. A prótese de politetrafluoroetileno (PTFE é reservada para casos de falência de material autógeno e é geralmente utilizada em fístulas em membros superiores. Descrevemos o caso de uma paciente de 52 anos que, após falência de acessos para hemodiálise e impossibilidade de realização de diálise peritoneal em razão de peritonite bacteriana, foi submetida à confecção de FAV entre a artéria axilar direita e a veia cava inferior com prótese de PTFE de 6 mm. O acesso foi utilizado para hemodiálise 1 mês após sua criação e permanece pérvio após 24 meses. Até o momento, não houve complicações infecciosas, sinais de insuficiência cardíaca ou síndrome de roubo em membro superior direito.With regards to the creation of an arteriovenous fistula (AV fistula for hemodialysis, autogenous venous grafts clearly show high performance when compared with prosthetic material in terms of primary or secondary patency. Polytetrafluoroethylene (PTFE grafts for the reconstruction of AV fistulae must be restricted to cases of failure of the autogenous material, which is generally used in upper limb fistulae. We describe a case of a 52-year-old patient, who, after access failure for hemodialysis and the impossibility of performing peritoneal dialysis due to bacterial peritonitis, underwent the reconstruction of an AV fistula between the right axillary artery and the cava vein using a 6-mm PTFE prosthesis. One month after surgery, this AV fistula started to be used for hemodialysis. The AV fistula remains patent 24 months after its creation. No infectious complications, cardiac insufficiency symptoms, or steal syndromes of right upper limb were detected.

  16. Climate Reconstructions

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The NOAA Paleoclimatology Program archives reconstructions of past climatic conditions derived from paleoclimate proxies, in addition to the Program's large...

  17. Laryngopharyngeal reconstruction

    OpenAIRE

    Kazi, Rehan A

    2006-01-01

    There is a high incidence of hypopharyngeal cancer is our country due to the habits of tobacco and alcohol. Moreover these cases are often detected in the late stages thereby making the issue of reconstruction very tedious and unpredictable. There are a number of options for laryngopharyngeal reconstruction available now including the use of microvascular flaps depending upon the patient’s fitness, motivation, technical expertise, size and extent of the defect. This article reviews the differ...

  18. Acute iliofemoral venous thrombosis in patients with atresia of the inferior vena cava can be treated successfully with catheter-directed thrombolysis

    DEFF Research Database (Denmark)

    Broholm, Rikke; Jørgensen, Maja; Just, Sven; Jensen, Leif P; Bækgaard, Niels

    2011-01-01

    To assess the effectiveness and clinical outcomes of catheter-directed thrombolysis in patients with atresia of the inferior vena cava (IVC) and acute iliofemoral deep vein thrombosis (DVT).......To assess the effectiveness and clinical outcomes of catheter-directed thrombolysis in patients with atresia of the inferior vena cava (IVC) and acute iliofemoral deep vein thrombosis (DVT)....

  19. Clinically asymptomatic thrombosis of the inferior vena cava as an incidental finding by sonography after surgical treatment of a tumor in the mediastinum

    International Nuclear Information System (INIS)

    In the case of suspected thrombosis of the venia cava caudalis, ultrasonography, CT and NMR imaging are excellent diagnostic tools. For a diagnostic scanning of the collateral vene, phlebography of the inferior vena cava is the method yielding the most significant results. (orig.)

  20. Repair of the inferior vena cava with autogenous peritoneo-fascial patch graft following abdominal trauma: a case report.

    Science.gov (United States)

    Emmiler, Mustafa; Kocogullari, Cevdet Ugur; Yilmaz, Sezgin; Cekirdekci, Ahmet

    2008-01-01

    Abdominal vascular injuries are among the most challenging and lethal injuries in traumatized patients. Inferior vena cava is the most frequently injured vein during the blunt or penetrating trauma. The primary repair, end to end anastomosis, endovascular stenting, or graft interposition with autogenous or synthetic materials should be considered in selected cases. However, in cases the synthetic graft was preferred, intestinal contaminations due to small or large bowel perforation accompanying the trauma have been cited as a limiting factor for the use of such grafts as in the current case. However, a previous history of lower leg variceal surgery prevents the use of great saphenous vein as a graft. So in the present case, the authors report a patient with inferior vena cava injury repaired with autogenous peritoneo-fascial graft. The authors have used APF graft in traumatic inferior vena cava injury for the first time. PMID:18667465

  1. On-and offshore tephrostratigraphy and -chronology of the southern Central American Volcanic Arc (CAVA)

    Science.gov (United States)

    Schindlbeck, J. C.; Kutterolf, S.; Hemming, S. R.; Wang, K. L.

    2015-12-01

    Including the recently drilled CRISP sites (IODP Exp. 334&344) the deep sea drilling programs have produced 69 drill holes at 29 Sites during 9 Legs at the Central American convergent margin, where the Cocos plate subducts beneath the Caribbean plate. The CAVA produced numerous plinian eruptions in the past. Although abundant in the marine sediments, information and data regarding large late Cenozoic explosive eruptions from Costa Rica, Nicaragua, Honduras, El Salvador, and Guatemala remain very sparse and discontinuous on land. We have established a tephrostratigraphy from recent through Miocene times from the unique archive of ODP/IODP sites offshore Central America in which we identify tephra source regions by geochemical fingerprinting using major and trace element glass shard compositions. Here we present first order correlations of ­~500 tephra layers between multiple holes at a single site as well as between multiple sites. We identified ashes supporting Costa Rican (~130), Nicaraguan (17) and Guatemalan (27) sources as well as ~150 tephra layers from the Galápagos hotspot. Within our marine record we also identified well-known marker beds such as the Los Chocoyos tephra from Atitlán Caldera in Guatemala and the Tiribi Tuff from Costa Rica but also correlations to 15 distinct deposits from known Costa Rican and Nicaraguan eruptions within the last 4.1 Ma. These correlations, together with new radiometric age dates, provide the base for an improved tephrochronostratigraphy in this region. Finally, the new marine record of explosive volcanism offshore southern CAVA provides insights into the eruptive history of long-living volcanic complexes (e.g., Barva, Costa Rica) and into the distribution and frequency of large explosive eruptions from the Galápagos hotspot. The integrated approach of Ar/Ar age dating, correlations with on land deposits from CAVA, biostratigraphic ages and sediment accumulation rates improved the age models for the drilling sites.

  2. The Analysis of Postoperative Complications after Thrombectomy From Inferior Vena Cava in Renal Cell Carcinoma

    Directory of Open Access Journals (Sweden)

    Atduev V.A.

    2012-06-01

    Full Text Available The aim of the investigation is to analyze the results of thrombectomy from inferior vena cava in renal cell carcinoma to reveal the main prognostic factors of postoperative complications. Materials and Methods. Nephrectomy with thrombectomy from inferior vena cava was performed in 34 patients. Thrombus level Т3b was revealed in 27 patients (79.4% (thrombus length — 5.10±1.75 cm, Т3с — in 7 patients (20.6% (thrombus length — 14.80±0.98 см. Postoperative complications were analyzed according to Clavien–Dindo classification of surgical complications. Results. Blood loss volume in operation was on average 866 ml (250–4000 ml. 18 patients (52.9% had no complications. Two patients (5.9% had I degree complication (anemia. The II degree of complication was revealed in 11 patients (32.3%, after the operation they underwent blood transfusion. One patients (2.9% had IIIa degree of complications (after the operation he required pleural punctures and pericardium drainage under local anesthesia, and one patients had IIIв degree of complications (descending colon perforation — he underwent relaparotomy and colostomy. There were no IV degree complications. One patient (2.9% died (V degree from pulmonary embolism. Correlation analysis determined high (r=0.7 complications dependence of thrombus size and blood loss volume (r=0.6 and low dependence — of tumour size (r=0.44. There were revealed no complication dependence of patients age (r=0.1, status on Karnofsky scale (r=0.0. All 33 patients discharged from hospital had lived over 6 months after the operation. Conclusion. After nephrectomy with thrombectomy from inferior vena cava there is high risk of postoperative complications, the frequency and type of which to a greater degree depend on thrombus size and blood loss volume.

  3. Computational Modeling of Blood Flow in the TrapEase Inferior Vena Cava Filter

    Energy Technology Data Exchange (ETDEWEB)

    Singer, M A; Henshaw, W D; Wang, S L

    2008-02-04

    To evaluate the flow hemodynamics of the TrapEase vena cava filter using three dimensional computational fluid dynamics, including simulated thrombi of multiple shapes, sizes, and trapping positions. The study was performed to identify potential areas of recirculation and stagnation and areas in which trapped thrombi may influence intrafilter thrombosis. Computer models of the TrapEase filter, thrombi (volumes ranging from 0.25mL to 2mL, 3 different shapes), and a 23mm diameter cava were constructed. The hemodynamics of steady-state flow at Reynolds number 600 was examined for the unoccluded and partially occluded filter. Axial velocity contours and wall shear stresses were computed. Flow in the unoccluded TrapEase filter experienced minimal disruption, except near the superior and inferior tips where low velocity flow was observed. For spherical thrombi in the superior trapping position, stagnant and recirculating flow was observed downstream of the thrombus; the volume of stagnant flow and the peak wall shear stress increased monotonically with thrombus volume. For inferiorly trapped spherical thrombi, marked disruption to the flow was observed along the cava wall ipsilateral to the thrombus and in the interior of the filter. Spherically shaped thrombus produced a lower peak wall shear stress than conically shaped thrombus and a larger peak stress than ellipsoidal thrombus. We have designed and constructed a computer model of the flow hemodynamics of the TrapEase IVC filter with varying shapes, sizes, and positions of thrombi. The computer model offers several advantages over in vitro techniques including: improved resolution, ease of evaluating different thrombus sizes and shapes, and easy adaptation for new filter designs and flow parameters. Results from the model also support a previously reported finding from photochromic experiments that suggest the inferior trapping position of the TrapEase IVC filter leads to an intra-filter region of recirculating

  4. Filtros de vena cava en pacientes con cáncer

    Directory of Open Access Journals (Sweden)

    Fernando A. Díaz Couselo

    2012-08-01

    Full Text Available Los pacientes con tromboembolismo venoso (TEV y cáncer tienen más complicaciones vinculadas al tratamiento anticoagulante que la población general. Los filtros de vena cava constituyen una herramienta útil para el tratamiento del TEV y su utilización es controvertida en estadios avanzados de la enfermedad. En este trabajo se revisaron las indicaciones, complicaciones y frecuencia de retiro de los filtros de vena cava en una población de pacientes oncológicos con TEV. Se analizaron 27 pacientes a quienes se les había colocado filtros de vena cava. Veinticinco tenían tumores sólidos y dos linfomas no Hodgkin. Veinticinco estaban bajo tratamiento activo (cirugía y/o quimioterapia. Diecinueve se hallaban en estadio IV de su enfermedad. El motivo de su indicación fue profilaxis en el período perioperatorio en 14 casos (51.9%, hemorragia (n = 5, trombocitopenia (n = 4, metástasis en sistema nervioso central (n = 2, accidente cerebrovascular (n = 1 y neurocirugía previa no reciente (n = 1. Se retiraron 8 (29.6% filtros. La mediana del tiempo de permanencia fue 21 días (6-75. No hubo diferencias estadísticamente significativas en la frecuencia de retiro entre los filtros colocados en el perioperatorio (6/14 y los colocados por otras contraindicaciones para la anticoagulación (2/13; p = 0.2087. No hubo fracasos ni complicaciones en los procedimientos de colocación y retiro.

  5. Bilateral dyb venos trombose og vena cava-aplasi behandlet med lokal trombolyse

    DEFF Research Database (Denmark)

    Pelta, A.M.; Jorgensen, M.; Jensen, L.P.; Just, Sven Richardt Lundgren

    2008-01-01

    In this case report the treatment of a young man with bilateral iliaco-femoral DVT and vena cava aplasia is presented. The patient was treated with catheter-directed thrombolysis; the catheters were introduced in the thrombus of both legs via v. popliteae. The treatment led to almost complete thr...... thrombus resolution and no valvular incompetence at three months follow-up. In our opinion this treatment should be offered even in complex cases of acute proximal deep venous thrombosis Udgivelsesdato: 2008/5/19...

  6. Digital subtraction phlebography of the arm veins and vena cava superior

    International Nuclear Information System (INIS)

    We report on the results of 40 digital subtraction phlebograms of the great veins of the upper extremities and the mediastinum in 32 patients. In all cases diagnostic satisfactory examinations were achieved that demonstrated the anatomy of the veins in question. The method can be either used for the primary diagnosis or for controls during lysis of thrombotic lesions. The v. cava superior could be opacified even after ipsilateral injection of diluted contrast media in one-sided thrombotic occlusions of these veins. (orig.)

  7. Absent right superior caval vein (vena cava) with normal atrial arrangement.

    OpenAIRE

    Choi, J. Y.; Anderson, R H; Macartney, F J

    1987-01-01

    Eight cases of absent right superior caval vein (vena cava) with normal atrial arrangement from the Great Ormond Street database were reviewed. In each case the right subclavian vein and jugular vein drained into a persistent left superior caval vein through a bridging vein. In six cases the left superior caval vein drained into the right atrium by way of the coronary sinus, and in two cases it drained into the left atrium directly because of the complete unroofing of the coronary sinus. The ...

  8. Residual Inferior Vena Cava Thrombus Detected by Transesophageal Echocardiography After Resection of a Malignant Adrenal Mass.

    Science.gov (United States)

    Burbano, Nelson H; Vlah, Claudene; Argalious, Maged

    2015-10-15

    A 43-year-old woman with a history of the Cushing syndrome secondary to adrenocortical carcinoma presented to the operating room for right adrenalectomy, hepatectomy, nephrectomy, and inferior vena cava (IVC) thrombectomy. Initial intraoperative transesophageal echocardiogram (TEE) confirmed the presence of an IVC tumor below the hepatic veins. Total vascular exclusion of the liver was necessary to perform the operation. A repeat TEE showed a residual thrombus within the IVC prompting an additional cavotomy to successfully remove the entire mass. The remainder of the procedure finalized uneventfully. The case highlights the importance of TEE monitoring for noncardiac surgery with thrombotic involvement of the IVC. PMID:26466307

  9. Cement embolus trapped in the inferior vena cava filter during percutaneous vertebroplasty

    Energy Technology Data Exchange (ETDEWEB)

    Li, Zhi; Ni, Rui Fang; Zhao, Xin; Yang, Chao; Li, Ming Ming [First Affiliated Hospital of Soochow University, Suzhou (China)

    2013-06-15

    A 58-year-old female patient, diagnosed with adenocarcinoma of the lung, underwent percutaneous vertebroplasty at the L4 vertebral body due to painful spinal metastases. Because of deep venous thrombosis of the left femoral and iliac veins, an inferior vena cava filter had been placed before vertebroplasty. Bone cement migrated into the venous bloodstream and then was being trapped within the previously placed filter. This case illustrates that caval filter could capture the bone cement and prevent it from migrating to the pulmonary circulation.

  10. Primary mediastinal melanoma presenting as superior vena cava syndrome: A case study

    Directory of Open Access Journals (Sweden)

    Ann C Gaffey

    2016-03-01

    Full Text Available The rates of melanoma have increased over the past 30 years. Malignant melanoma most commonly occurs in the skin with secondary involvement of other organs. Here, we present an extremely rare case of malignant melanoma of the mediastinum with presentation of superior vena cava syndrome without clinical evidence of extrathoracic disease. The incidence of this clinical presentation is uncommon, resulting in only a handful of case reports in the literature. [Arch Clin Exp Surg 2016; 5(1.000: 56-58

  11. Rectal cancer presenting tumor thrombosis in the inferior vena cava and common iliac vein: case report

    Energy Technology Data Exchange (ETDEWEB)

    Rhee, Sun Jung; Park, Seong Jin; Lee, Hae Kyung; Yi, Boem Ha; Park, Sung Il; Hong, Soo Jin; Kim, Hee Kyung; Park, Jeong Mi [Soonchunhyang University Hospital, Bucheon (Korea, Republic of)

    2008-10-15

    We report the radiologic findings of a rectal carcinoma case with tumor thrombus in the inferior vana cava and left common iliac vein of a 48-year-old woman. The patient complained of swelling in the left leg and consequently underwent a lymphoscintigraphy, CT venography, abdominal CT, PET-CT, pelvis MRI, and ultrasound doppler. The rectal cancer was determined via a colonoscopy. The tissue biopsy of tumor thrombus in the IVC was done during insertion of IVC filter and poorly differentiated adenocarcinoma was revealed by pathology.

  12. Cement embolus trapped in the inferior vena cava filter during percutaneous vertebroplasty

    International Nuclear Information System (INIS)

    A 58-year-old female patient, diagnosed with adenocarcinoma of the lung, underwent percutaneous vertebroplasty at the L4 vertebral body due to painful spinal metastases. Because of deep venous thrombosis of the left femoral and iliac veins, an inferior vena cava filter had been placed before vertebroplasty. Bone cement migrated into the venous bloodstream and then was being trapped within the previously placed filter. This case illustrates that caval filter could capture the bone cement and prevent it from migrating to the pulmonary circulation.

  13. Endovascular treatment of an iatrogenic superior vena cava perforation caused by the placement of a hemodialysis catheter: a case report

    Energy Technology Data Exchange (ETDEWEB)

    Kim, See Hyung; Kim, Young Hwan; Keum, Dong Yoon [Dongsan Medical Center, Keimyung University College of Medicine, Daegu (Korea, Republic of)

    2008-01-15

    The perforation of superior vena cava during the placement of a tunneled hemodialysis catheter, via the subclavian vein, is a rare complication, and is manifested by hemothorax or hemopericardium. The treatment of this complication requires an early diagnosis and open thoracic surgery. Herein, we report a patient with hemothorax due to the perforation of the superior vena cava during the placement of a tunneled hemodialysis catheter via the right subclavian vein which was successfully treated by embolization by way of a coil and histoacryl.

  14. Leiomyosarcoma of the Inferior Vena Cava Confirmed by Aspiration Biopsy With a Catheter During Digital Subtraction Angiography.

    Science.gov (United States)

    Yakupoglu, Abdullah; Ulus, Sila; Cantasdemir, Murat

    2016-04-01

    Leiomyosarcoma of the vascular origin is a rare malignant tumor. It originates from the smooth muscle cells of the media with intra- or extraluminal growth, and in most cases it arises in the inferior vena cava. The diagnosis is often delayed because the clinical symptoms of this disease are often nonspecific. Accurate diagnosis of inferior vena cava leiomyosarcoma (IVCLMS) needs histologic confirmation. We report a case of IVCLMS histologically confirmed by aspiration biopsy with a catheter during digital subtraction angiography presenting with pulmonary emboli in a 65-year-old man. PMID:27000390

  15. Right-sided superior vena cava draining into the left atrium: a rare anomaly of systemic venous return

    Energy Technology Data Exchange (ETDEWEB)

    Aminololama-Shakeri, Shadi; Wootton-Gorges, Sandra L.; Reyes, Melissa; Moore, Elizabeth H. [University of California Davis, Medical Center and Children' s Hospital, Department of Radiology, Sacramento, CA (United States); Pretzlaff, Robert K. [University of California Davis, Medical Center and Children' s Hospital, Department of Pediatrics, Sacramento, CA (United States)

    2007-03-15

    The most commonly encountered systemic thoracic venous anomaly is a persistent left superior vena cava that drains into the right atrium via the coronary sinus. A much rarer systemic venous anomaly is that of isolated anomalous drainage of a normally positioned right superior vena cava (RSVC) into the left atrium (LA). This has been reported in approximately 20 patients with the diagnosis usually being made by cardiac catheterization. We report the case of a toddler with asymptomatic hypoxemia resulting from anomalous drainage of a normal RSVC into his LA. This was diagnosed non-invasively by contrast-enhanced chest CT. (orig.)

  16. Endovascular Treatment of Malignant Superior Vena Cava Syndrome: Results and Predictive Factors of Clinical Efficacy

    Energy Technology Data Exchange (ETDEWEB)

    Fagedet, Dorothee, E-mail: DFagedet@chu-grenoble.fr [CHU de Grenoble, Clinique universitaire de medecine interne, Pole Pluridisciplinaire de Medecine (France); Thony, Frederic, E-mail: FThony@chu-grenoble.fr [CHU de Grenoble, Clinique universitaire de radiologie et imagerie medicale, Pole d' Imagerie (France); Timsit, Jean-Francois, E-mail: JFTimsit@chu-grenoble.fr [CHU de Grenoble, Clinique universitaire de reanimation, Pole Medecine Aiguee Communautaire (France); Rodiere, Mathieu, E-mail: MRodiere@chu-grenoble.fr [CHU de Grenoble, Clinique universitaire de radiologie et imagerie medicale, Pole d' Imagerie (France); Monnin-Bares, Valerie, E-mail: v-monnin@chu-montpellier.fr [CHRU Arnaud de Villeneuve, Imagerie Medicale Thoracique Cardiovasculaire (France); Ferretti, Gilbert R., E-mail: GFerretti@chu-grenoble.fr [CHU de Grenoble, Clinique universitaire de radiologie et imagerie medicale, Pole d' Imagerie (France); Vesin, Aurelien; Moro-Sibilot, Denis, E-mail: DMoro.pneumo@chu-grenoble.fr [University Grenoble 1 e Albert Bonniot Institute, Inserm U823 (France)

    2013-02-15

    To demonstrate the effectiveness of endovascular treatment (EVT) with self-expandable bare stents for malignant superior vena cava syndrome (SVCS) and to analyze predictive factors of EVT efficacy. Retrospective review of the 164 patients with malignant SVCS treated with EVT in our hospital from August 1992 to December 2007 and followed until February 2009. Endovascular treatment includes angioplasty before and after stent placement. We used self-expandable bare stents. We studied results of this treatment and looked for predictive factors of clinical efficacy, recurrence, and complications by statistical analysis. Endovascular treatment was clinically successful in 95% of cases, with an acceptable rate of early mortality (2.4%). Thrombosis of the superior vena cava was the only independent factor for EVT failure. The use of stents over 16 mm in diameter was a predictive factor for complications (P = 0.008). Twenty-one complications (12.8%) occurred during the follow-up period. Relapse occurred in 36 patients (21.9%), with effective restenting in 75% of cases. Recurrence of SVCS was significantly increased in cases of occlusion (P = 0.01), initial associated thrombosis (P = 0.006), or use of steel stents (P = 0.004). Long-term anticoagulant therapy did not influence the risk of recurrence or complications. In malignancy, EVT with self-expandable bare stents is an effective SVCS therapy. These results prompt us to propose treatment with stents earlier in the clinical course of patients with SVCS and to avoid dilatation greater than 16 mm.

  17. Nursing care of the complications caused by vena cava filter placement and thrombolytic therapy

    International Nuclear Information System (INIS)

    Objective: To discuss the nursing care and observation measures for the complications occurred after vena cava filter placement and thrombolytic therapy. Methods: During the period of July 2007-March 2010, vena cava filter placement and thrombolytic therapy were employed in 70 patients. The observation for the main procedure-related complications was made. The main complications included bleeding tendency, pulmonary embolism, filter migration or loss, thrombus formation within filter, IVC perforation due to filter, venous insufficiency and skin blisters of the affected lower extremity. Results: The total effective rate of thrombolytic treatment in 70 patients was 95.7%. As reasonable and effective nursing care measures were implemented, no major complications, such as pulmonary embolism, filter migration or loss,thrombus formation within filter, IVC perforation due to filter, infection, etc. occurred. The other complications developed in some patients,which included hematuria (n=4), bleeding at puncturing site (n=3), bleeding at abdominal incision (n=3), subcutaneous ecchymosis (n=3) and skin vesicles of diseased limb (n=3), all of which were cured after proper management. Conclusion: Postoperative nursing is a kind of prospective nursing care, the primary purpose of which is to prevent the occurrence of the potential complications after surgery. Therefore, solid fundamental knowledge, careful observation ability and strong consciousness of responsibility are most important.(authors)

  18. The clinical implications of variants of vena cava inferior and aorta on retroperitoneal surgery

    Directory of Open Access Journals (Sweden)

    S. V. Mukhtarulina

    2014-12-01

    Full Text Available Objective: to study variants of retroperitoneal vascular structure and its clinical implications on retroperitoneal surgery in patients with cervical cancer IA–IIB stage.Materials and methods. 101 patients who underwent paraaortic and bilateral pelvic lymphadenectomy were included in this study. 10 patients of the first group with anomalies of inferior vena cava, renal arteries and veins, common iliac vein and ovarian vessels were compared with 91 patients of the second group without anomalies.Results. Variants of major retroperitoneal vascular structure were present in 10 (9.9 % patients. Supernumerary renal arteries and veins observed in 5 (4.9 % patients; retroaortic left renal vein type I and II – in 3 (3.0 % patients. Double vena cava inferior detected in 1 (1.0 % patient. Patients with variants of retroperitoneal vascular structures hadn’t vessel injury. There was no difference in intraoperative hemorrhage, transfusion red blood cell, rate of intraoperative hemoglobin and removed paraaortic lymph nodes between the groups. Risk factors for intraoperative bleeding in patients with cervical cancer, depending on the presence or absence of anomalies of retroperitoneal vessels had no significant difference.Conclusion. Despite the fact that the variants of retroperitoneal vascular structures are rare (9.9 %, the success of retroperitoneal surgery is associated with the knowledge of vascular variations which decrease serious, life-threatening complications.

  19. CT of inferior vena cava filters: normal presentations and potential complications.

    Science.gov (United States)

    Georgiou, Nicholas A; Katz, Douglas S; Ganson, George; Eng, Kaitlin; Hon, Man

    2015-12-01

    With massive pulmonary embolism (PE) being the first or second leading cause of unexpected death in adults, protection against PE is critical in appropriately selected patients. The use of inferior vena cava (IVC) filters has increased over the years, paralleling the increased detection of deep venous thrombosis (DVT) and PE by improved and more available imaging techniques. The use of IVC filters has become very common as an alternative and/or as a supplement to anticoagulation, and these filters are often seen on routine abdominal CT, including in the emergency setting; therefore, knowledge of the normal spectrum of findings of IVC filters by the radiologist on CT is critical. Additionally, CT can be used specifically to identify complications related to IVC filters, and CT may alternatively demonstrate IVC filter-related problems which are not specifically anticipated clinically. With multiple available IVC filters on the US market, and even more available outside of the USA, it is important for the emergency and the general radiologist to recognize the different models and various appearances and positioning on CT, as well as their potential complications. These complications may be related to venous access, but also include thrombosis related to the filter, filter migration and penetration, and problems associated with filter deployment. With the increasing number of inferior vena cava filters placed and their duration within patients increasing over time, it is critical for emergency and other radiologists to be aware of these findings on CT. PMID:26183040

  20. A new type of inferior vena cava filter and its animal experiment

    Institute of Scientific and Technical Information of China (English)

    YU; Xue-bao; LIU; Mei-rong; GUO; Jin-fang; HU; Yu-ling

    2005-01-01

    This article explains the definition of pulmonary embolism as well as its causes and elaborates on a new type of inferior vena cava filter(VCF)we have developed. Shaped like a waistdrum,the VCF is mainly made of TiNi shape memory alloy-wire. It has a subulate wire frame which can intercept the thrombus on each side. Its medial body is made up of straight shape memory alloywire . Every pillar is bound by several shape memory alloy springs. This type of inferior vena cava filter has a good resistance to fatigue and is hard to be broken. Through animal experiments its framework has been proved to be lasting. Neither deformation nor fragmentation happened when the VCF had been kept in the body for a long time. The thrombus interception efficiency of our VCF is higher than imported VCFs. The filter is unfavorable for thrombosis. After implantation,the IVC was completely unimpeded and no displacement occurred. Moreover the VCF did little damage to the Wall of vein. Neither IVC perforation nor haematoma occurred after the operation.

  1. Accidental implantation of hemodialysis catheter in persistent left superior vena cava

    International Nuclear Information System (INIS)

    The implantation of central catheters for hemodialysis in patients with renal failure is a common practice. The venous access to the internal jugular vein through percutaneous puncture is the most recommended procedure because it produces the lowest percentage of stenosis. The right internal jugular vein puncture is the most appropriate one because it goes directly in vertical direction into the right atrium, but in some cases its canalization is impossible making it necessary to puncture the left internal jugular vein, the one next to the innominated vein that ends in the superior cava, with the result that its path is much curved. 3 cases in which the left intern jugular catheter that was inserted to perform hemodialysis accidentally canalized the anomaly in the persistent left superior vena cava were presented. In all the cases and before proceeding with the hemodialysis it was demonstrated by the gases of the punctuated vessel, echocardiogram or contrast medium that the catheter was positioned in the venous system that drains in the right atrium.

  2. Project Reconstruct.

    Science.gov (United States)

    Helisek, Harriet; Pratt, Donald

    1994-01-01

    Presents a project in which students monitor their use of trash, input and analyze information via a database and computerized graphs, and "reconstruct" extinct or endangered animals from recyclable materials. The activity was done with second-grade students over a period of three to four weeks. (PR)

  3. Vaginal reconstruction

    Energy Technology Data Exchange (ETDEWEB)

    Lesavoy, M.A.

    1985-05-01

    Vaginal reconstruction can be an uncomplicated and straightforward procedure when attention to detail is maintained. The Abbe-McIndoe procedure of lining the neovaginal canal with split-thickness skin grafts has become standard. The use of the inflatable Heyer-Schulte vaginal stent provides comfort to the patient and ease to the surgeon in maintaining approximation of the skin graft. For large vaginal and perineal defects, myocutaneous flaps such as the gracilis island have been extremely useful for correction of radiation-damaged tissue of the perineum or for the reconstruction of large ablative defects. Minimal morbidity and scarring ensue because the donor site can be closed primarily. With all vaginal reconstruction, a compliant patient is a necessity. The patient must wear a vaginal obturator for a minimum of 3 to 6 months postoperatively and is encouraged to use intercourse as an excellent obturator. In general, vaginal reconstruction can be an extremely gratifying procedure for both the functional and emotional well-being of patients.

  4. Vaginal reconstruction

    International Nuclear Information System (INIS)

    Vaginal reconstruction can be an uncomplicated and straightforward procedure when attention to detail is maintained. The Abbe-McIndoe procedure of lining the neovaginal canal with split-thickness skin grafts has become standard. The use of the inflatable Heyer-Schulte vaginal stent provides comfort to the patient and ease to the surgeon in maintaining approximation of the skin graft. For large vaginal and perineal defects, myocutaneous flaps such as the gracilis island have been extremely useful for correction of radiation-damaged tissue of the perineum or for the reconstruction of large ablative defects. Minimal morbidity and scarring ensue because the donor site can be closed primarily. With all vaginal reconstruction, a compliant patient is a necessity. The patient must wear a vaginal obturator for a minimum of 3 to 6 months postoperatively and is encouraged to use intercourse as an excellent obturator. In general, vaginal reconstruction can be an extremely gratifying procedure for both the functional and emotional well-being of patients

  5. ACL reconstruction - discharge

    Science.gov (United States)

    Anterior cruciate ligament reconstruction - discharge; ACL reconstruction - discharge ... had surgery to reconstruct your anterior cruciate ligament (ACL). The surgeon drilled holes in the bones of ...

  6. Long-term follow-up of patients with inferior vena cava filters in the prevention of pulmonary embolism

    International Nuclear Information System (INIS)

    Objective: To evaluate the long-term safety, efficacy and complications of placement vena cava filter in prevention of pulmonary embolism. Methods: Seventy-three patients with proven diagnosis of deep venous thrombosis (DVT) and (or) pulmonary embolism (PE) by Doppler ultrasonography, DSA, CT or MRI, received percutaneous inferior vena cava filters (IVCF) from January 1994 to June 2005. The clinical data and imaging findings were evaluated retrospectively. The patients underwent telephone interview or questionnaire, abdominal X-rays, Doppler ultrasonography, computed tomographic pulmonary angiography (CTPA) or indirect CT venography (CTV) after a follow-up duration of 5 months to 11 years. Results: Seventy-eight vena cava filters were used. There was 1 case of incomplete filter opening when placing filter. In follow-up, thrombi were trapped in the filter in 2 cases, filter tilting happened in 1 case, and there were no filter migration, filter disruption, filter perforation. Five of 73 cases were lost in follow-up visit, 14 patients died after implantation (5 days to 41 months, average 14.5 months). Among the 54 living patients, the identified recurrent PE was not noted. Three cases of recurrent DVT, 1 case of inferior vena caval thrombosis and 1 case of thrombosed filters were seen in follow-up. Conclusion: Inferior vena cava filter is safe and effective for the long-term prevention pulmonary embolism, and the long-term major complications after filter placement are not frequent. (authors)

  7. Planning deep inferior epigastric perforator flaps for breast reconstruction: a comparison between multidetector computed tomography and magnetic resonance angiography

    Energy Technology Data Exchange (ETDEWEB)

    Cina, A.; Rinaldi, P.; Cipriani, A.; Bonomo, L. [Agostino Gemelli Hospital, Catholic University of Sacred Heart, Department of Radiological Sciences, Rome (Italy); Barone-Adesi, L.; Salgarello, M. [Agostino Gemelli Hospital, Catholic University of Sacred Heart, Department of Surgery, Plastic and Reconstructive Surgery Unit, Rome (Italy); Masetti, R. [Agostino Gemelli Hospital, Catholic University of Sacred Heart, Department of Surgery, Breast Surgery Unit, Rome (Italy)

    2013-08-15

    Deep inferior epigastric perforator (DIEP) flaps have become the state of the art in breast reconstruction. We compared the diagnostic performance of multidetector computed tomography (CTA) and magnetic resonance angiography (MRA) in DIEP flap planning. Twenty-three women (mean age 48.0 years, range 26-72 years) underwent preoperative blinded evaluation using 64-slice CTA and 1.5-T MRA. Perforator identification, measurement of their calibre, intramuscular course (IMC), assessment of direct venous connections (DVC) with main superficial veins, superficial venous communications (SVC) between the right and left hemi-abdomen and deep inferior epigastric artery (DIEA) branching type were performed. Surgery was carried out by the same team. Intraoperative findings were the standard of reference. Accuracy in identifying dominant perforators was 91.3 % for both techniques and mean error in calibre measurement 1.18 {+-} 0.35 mm for CTA and 1.63 {+-} 0.39 mm for MRA. Accuracy in assessing perforator IMCs was 97.1 % for CTA and 88.4 % for MRA, DVC 94.4 % for both techniques, SVC 91.3 % as well, and DIEA branching type 100 % for CTA and 91.3 % for MRA. Image acquisition and interpretation time was 21 {+-} 3 min for CTA (35 {+-} 5 min for MRA). In a strategy to optimise DIEP flap planning avoiding radiation exposure, MRA can be proposed alternatively to CTA. (orig.)

  8. Planning deep inferior epigastric perforator flaps for breast reconstruction: a comparison between multidetector computed tomography and magnetic resonance angiography

    International Nuclear Information System (INIS)

    Deep inferior epigastric perforator (DIEP) flaps have become the state of the art in breast reconstruction. We compared the diagnostic performance of multidetector computed tomography (CTA) and magnetic resonance angiography (MRA) in DIEP flap planning. Twenty-three women (mean age 48.0 years, range 26-72 years) underwent preoperative blinded evaluation using 64-slice CTA and 1.5-T MRA. Perforator identification, measurement of their calibre, intramuscular course (IMC), assessment of direct venous connections (DVC) with main superficial veins, superficial venous communications (SVC) between the right and left hemi-abdomen and deep inferior epigastric artery (DIEA) branching type were performed. Surgery was carried out by the same team. Intraoperative findings were the standard of reference. Accuracy in identifying dominant perforators was 91.3 % for both techniques and mean error in calibre measurement 1.18 ± 0.35 mm for CTA and 1.63 ± 0.39 mm for MRA. Accuracy in assessing perforator IMCs was 97.1 % for CTA and 88.4 % for MRA, DVC 94.4 % for both techniques, SVC 91.3 % as well, and DIEA branching type 100 % for CTA and 91.3 % for MRA. Image acquisition and interpretation time was 21 ± 3 min for CTA (35 ± 5 min for MRA). In a strategy to optimise DIEP flap planning avoiding radiation exposure, MRA can be proposed alternatively to CTA. (orig.)

  9. OptEase and TrapEase Vena Cava Filters: A Single-Center Experience in 258 Patients

    International Nuclear Information System (INIS)

    We aimed to evaluate the efficacy and safety of the OptEase and TrapEase (both from Cordis, Roden, Netherlands) vena cava filters in the prevention of pulmonary embolism (PE). Between May 2004 and December 2008, OptEase (permanent/retrievable; n = 228) or TrapEase (permanent; n = 30) vena cava filters were placed in 258 patients (160 female and 98 male; mean age 62 years [range 22 to 97]). Indications were as follows: prophylaxis for PE (n = 239), contraindication for anticoagulation in the presence of PE or DVT (n = 10), and development of PE or DVT despite anticoagulation (n = 9). Medical records were retrospectively reviewed for indications, clinical results, and procedure-related complications during placement and retrieval. Clinical PE did not develop in any of the patients. However, radiologic signs of segmental PE were seen in 6 of 66 patients with follow-up imaging data. Migration or fracture of the filter or cava perforation was not seen in any of the patients. Except for a single case of asymptomatic total cava thrombosis, no thrombotic occlusion was observed. One hundred forty-one patients were scheduled to undergo filter removal; however, 17 of them were not suitable for such based on venography evaluation. Removal was attempted in 124 patients and was successful in 115 of these (mean duration of retention 11 days [range 4 to 23]). Nine filters could not be removed. Permanent/retrievable vena cava filters are safe and effective devices for PE prophylaxis and for the management of venous thromboembolism by providing the option to be left in place.

  10. Radio Reconstructions

    OpenAIRE

    Bulley, James; Jones, Daniel

    2013-01-01

    Radio Reconstructions is a sound installation which use indeterminate radio broadcasts as its raw material. Each piece is structured by a notated score, which controls its rhythm, dynamics and melodic contour over time. The audio elements used to enact this score are selected in real-time from unknown radio transmissions, by an autonomous software system which is continuously scanning the radio waves in search of similar fragments of audio. Using a technique known as audio mosaicing, hund...

  11. X-ray examination in diagnosis of hepatic segment deficiency of inferior cava

    Energy Technology Data Exchange (ETDEWEB)

    Kiseleva, I.P.; Podzolkov, V.P.; Ivanitskij, A.V.; Mal' sagov, G.U. (Akademiya Meditsinskikh Nauk SSSR, Moscow. Inst. Serdechno-Sosudistoj Khirurgii; Tsentral' nyj Inst. Usovershenstvovaniya Vrachej, Moscow (USSR))

    Data on clinical and X-ray examination of 29 patients aged 2 weeks to 66 years with vena cava inferior hepatic segment deficiency are presented. The blood outflow from the lower part of the body was effected through the azygos vein in 17 patients, and through the hemiazygos one in 12 patients. The data obtained were in all cases correlated with the results of intracardiac research methods (the right and left heart cavities catherization and angiocardiography), with intraoperative and autopsy findings. An anomaly was found to prevail in patients (89.6%) with different types of abnormal heart position in the thoracic cavity. Along with examination of the cardiovascular system, the abdominal organs study was carried out: standard roentgenoscopy and radiography, both aiming to detect the liver position, gastrointestinal tract examination, and cholecystography.

  12. X-ray examination in diagnosis of hepatic segment deficiency of inferior cava

    International Nuclear Information System (INIS)

    Data on clinical and X-ray examination of 29 patients aged 2 weeks to 66 years with vena cava inferior hepatic segment deficiency are presented. The blood outflow from the lower part of the body was effected through the azygos vein in 17 patients, and through the hemiazygos one in 12 patients. The data obtained were in all cases correlated with the results of intracardiac research methods (the right and left heart cavities catherization and angiocardiography), with intraoperative and autopsy findings. An anomaly was found to prevail in patients (89.6%) with different types of abnormal heart position in the thoracic cavity. Along with examination of the cardiovascular system, the abdominal organs study was carried out: standard roentgenoscopy and radiography, both aiming to detect the liver position, gastrointestinal tract examination, and cholecystography

  13. Patency of the inferior vena cava after placement of Simon nitinol filter

    International Nuclear Information System (INIS)

    This paper reports on Simon nitinol filters (SNFs) placed in 33 patients (11 male, 22 female; mean age, 67 years; range, 38-88 years) since February 1988. MR imaging and US were performed in 18 of these patients to evaluate patency of the inferior vena cava (IVC) 2-9 months after SNF placement. Six patients were imaged twice with MR and US, for a total of 24 studies. Duplex Doppler US was used. For MR imaging, spin-echo sequences were used for six examinations in five patients, and fast low-angle shot sequences in the remaining 18. The results were as follows for MR imaging versus US: adequate visualization of the IVC, 23 versus 10 studies; partial visualization, one versus five; nonvisualization, zero versus nine; normal IVC, 16 versus 10; occlusions of IVC, five (three patients) versus zero; partial occlusion, two (asymptomatic patients) versus zero; and nondiagnostic findings, one versus 14

  14. Liver transplantation with preservation of the inferior vena cava in case of symptomatic adult polycystic disease.

    Science.gov (United States)

    Lerut, Jan; Ciccarelli, Olga; Rutgers, Matthieu; Orlando, Giuseppe; Mathijs, Jules; Danse, Etienne; Goffin, Eric; Gigot, Jean-François; Goffette, Pierre

    2005-05-01

    Adult polycystic liver disease (APLD) is a rare disorder of the liver parenchyma, the treatment of which is still controversial. Conservative surgery may have a significant morbidity and is often ineffective in the long run. Liver replacement may be indicated in case of incapacitating hepatomegaly. Patients (one male, five females) undergoing liver transplantation for symptomatic APLD is presented in this study. The particular nature of this series is the fact that successful transplantation was performed in all cases with preservation of the recipient's inferior vena cava and without use of veno-venous bypass despite massive hepatomegaly and previous extensive liver surgery (in three cases). There was minimal morbidity and no mortality. All patients have excellent quality of life with a median follow-up of 41 months (range: 12-58) as testified by a median Karnofsky score of 90% (range: 80-100%). PMID:15819798

  15. Trimodality Therapy for an Advanced Thymic Carcinoma With Both Aorta and Vena Cava Invasion.

    Science.gov (United States)

    Momozane, Tohru; Inoue, Masayoshi; Shintani, Yasushi; Funaki, Soichiro; Kawamura, Tomohiro; Minami, Masato; Shirakawa, Yukitoshi; Kuratani, Toru; Sawa, Yoshiki; Okumura, Meinoshin

    2016-08-01

    A case of locally advanced thymic carcinoma that was successfully resected with the great vessels after chemoradiation therapy is reported. A 57-year-old man with Masaoka stage III thymic carcinoma received two cycles of cisplatin/docetaxel and 60 Gy irradiation. The response was stable disease with 19% size reduction, and a radical resection with the ascending aorta and superior vena cava with the patient under circulatory arrest with the use of cardiopulmonary bypass was performed. The postoperative course was uneventful, and the patient has been free of disease for 28 months. Trimodality therapy with use of a cardiovascular surgical procedure might be a valuable option in locally advanced thymic carcinoma. PMID:27449450

  16. Acute wiiitis representing as thrombosis of the inferior vena cava and left pelvic veins.

    Science.gov (United States)

    Brodmann, M; Gary, T; Hafner, F; Eller, P; Deutschmann, H; Pilger, E; Seinost, G

    2015-08-01

    Deep venous thrombosis as a result of venous wall injury provoked by trauma is a common finding. It often occurs in patients with sportive overstraining, caused by over fatigue of the body structures. In 2007, the entity of "acute wiiitis" was first described in a letter to the New England Journal of Medicine. Acute wiiitis sums up all affections, mainly skeletal and muscle affections, provoked by playing Nintendo Wii, a very common and loved video-game system. Deep venous thrombosis as a consequence of Nintendo Wii has not been described so far. We present a patient with a massive free floating thrombus of the left pelvic veins originating from the gluteal veins and reaching into the inferior vena cava after playing Nintendo Wii. PMID:24681523

  17. Brachytherapy for the prevention of neointimal hyperplasia in the canine inferior vena cava after stent placement

    Energy Technology Data Exchange (ETDEWEB)

    Isota, Masayuki; Kaminou, Toshio; Sakai, Yukimasa; Nakamura, Kenji; Yamada, Ryusaku [Osaka City Univ. (Japan). Medical School

    2002-06-01

    The aim of this study was to evaluate the efficacy of brachytherapy for preventing neointimal hyperplasia in the inferior vena cava (IVC) after stent placement. Sixteen beagles underwent Z-stent placement in the IVC and the aorta. For 8 of 16 beagles, irradiation (15 Gy) was delivered endoluminally to the stented segments of each vessel immediately after stent placement using the {sup 192}Ir. All animals were sacrificed after 6 weeks for morphometric and histopathologic examination. Morphometrically, neointimal thickness in the IVC of the radiation group was significantly decreased compared with the control group as well as that in the aorta (p<0.05). Histopathologic findings showed the neointima in the IVC of the control group contained markedly organization of thrombus and neovascularization though that in the IVC of the radiation group consisted mainly of smooth muscle cells without organization of thrombus and neovascularization. From these data intravenous irradiation may prevent clinical restenosis after stent placement. (author)

  18. CT of anomalies of the inferior vena cava and left renal vein

    International Nuclear Information System (INIS)

    Incidence of anomalies of the inferior vena cava (IVC) and left renal vein (LRV) was examined with post-contrast abdominal CT studies in the last five years and seven months retrospectively. Of the total 1100 cases, right retrocaval ureter was noted in two cases (0.2 %), left IVC was two (0.2 %) and bilateral IVC was twelve (1.1 %) about anomalies of the IVC. As to anomalies of the LRV, retroaortic LRV was four (0.4 %) and circumaortic LRV was six (0.5 %). These results did not always agree with those of previous reports on dissection cases. Particularly, incidence of anomalies of the LRV on CT was much lower than that on dissection. We speculated that racial difference was one of its causes. Clinical usefulness of CT for evaluation of anomalies of the IVC and LRV was stressed. (author)

  19. Inferior vena cava obstruction and collateral circulation as unusual manifestations of hepatobiliary cystadenocarcinoma

    Institute of Scientific and Technical Information of China (English)

    Nikolaos Arkadopoulos; Anneza I Yiallourou; Constantinos Palialexis; Emmanouil Stamatakis

    2013-01-01

    BACKGROUND: Hepatobiliary cystadenocarcinoma represents a rare epithelial malignant tumor derived from the intrahepatic bile duct. METHODS: A 71-year-old woman, who had undergone laparos-copic drainage of a cystic lesion of the right hepatic lobe, was misdiagnosed  as  having  hepatic  echinococcal  disease,  and received intracystic infusion of 95% ethanol four years ago. She was admitted to our hospital for further treatment. RESULTS: Physical  examination  revealed  dilated  superficial veins  across  the  right  abdominal  wall.  After  mapping  the direction of blood flow in these vessels, we assumed that this was a sign of inferior vena cava obstruction. Abdominal ultrasound, computed tomography, magnetic resonance imaging combined with  magnetic  resonance  angiography  showed  a  large  cystic mass in the right upper quadrant and epigastrium, displacing the  adjacent  structures,  adherent  to  the  inferior  vena  cava, which  was  not  patent,  resulting  in  dilation  of  superficial epigastric  veins.  The  patient  underwent  an  exploratory laparotomy.  Total  excision  of  the  huge  mass  measuring  16× 15  cm  was  possible  under  selective  vascular  exclusion  of  the liver. Removal of the tumor resulted in immediate restoration of flow in the inferior vena cava. On the basis of the pathology and findings of immunohistochemical analysis, a hepatobiliary cystadenocarcinoma was diagnosed. CONCLUSIONS: In the present case, hepatobiliary cystadenocar-cinoma was accompanied by dilated superficial venous collaterals due to inferior vena

  20. Long-Term Safety and Effectiveness of the “OptEase” Vena Cava Filter

    International Nuclear Information System (INIS)

    Purpose: To assess the long-term safety and effectiveness of the OptEase inferior vena cava (IVC) filter. Materials and Methods: In this Institutional Review Board-approved, retrospective study, we reviewed data of 71 patients who received an OptEase filter at our institution from 2002 to 2007. Thirty-nine (55%) patients had symptoms of venous thromboembolism before filter placement. The indications for filter included contraindication to anticoagulation in 31 (44%) patients, prophylaxis against pulmonary embolism (PE) in 29 (41%) patients, and failure of anticoagulation in 11 (15%) patients. Procedure-related complications, such as symptomatic post-filter PE, deep venous thrombosis (DVT), IVC occlusion, and incidental imaging-evident filter-related complications, were recorded. Safety was assessed by the occurrence of filter-related complications during placement and follow-up. Effectiveness was assessed by the occurrence of post-filter PE. Results: Sixty-five (92%) filters were placed under fluoroscopy, and 6 (8%) were placed using intravascular ultrasound guidance. Seventy (99%) filters were placed successfully. Seven (10%) filters were placed in the suprarenal cava. Retrieval was attempted in 14 (20%) patients, and 12 filters were successfully retrieved. Clinical follow-up was available for 20 ± 21 months. Symptoms of postfilter PE and DVT occurred in 15% (n = 11) and 10% (n = 7) patients, respectively. None of these patients had computed tomography (CT)-proven PE, and only one had ultrasound-proven new DVT. One patient had symptomatic IVC occlusion. Follow-up abdominal CT in 20 patients showed thrombus in the filter in two of them. There were no instances of filter migration, filter tilt, or caval wall penetration. Conclusion: The OptEase filter appears to have an acceptable long-term safety profile. The filter was effective against PE.

  1. Adrenocortical carcinoma with extension to the inferior vena cava and right atrium: 20-month-old girl with TP53 mutation

    Directory of Open Access Journals (Sweden)

    Terry L. Levin, MD

    2015-01-01

    Full Text Available A 20-month-old female presented with respiratory distress and a right adrenal mass extending into the inferior vena cava and right atrium. The mass was initially thought to be neuroblastoma. Pathology later revealed adrenocortical carcinoma. Inferior vena cava extension is far more common in adrenocortical carcinoma than neuroblastoma, and its presence should prompt clinical and laboratory evaluation for an adrenocortical tumor. The genetic findings in TP53 associated with this disease are discussed.

  2. Tracheal reconstructions.

    Science.gov (United States)

    Srikrishna, S V; Shekar, P S; Shetty, N

    1998-12-01

    Surgical reconstruction of the trachea is a relatively complex procedure. We had 20 cases of tracheal stenosis. We have a modest experience of 16 tracheal reconstructions for acquired tracheal stenosis. Two patients underwent laser treatment while another two died before any intervention. The majority of these cases were a result of prolonged ventilation (14 cases), following organophosphorous poisoning (11 cases), Guillain-Barré syndrome, bullet injury, fat embolism and surprisingly only one tumor, a case of mucoepidermoid carcinoma, who had a very unusual presentation. There were 12 males and 4 females in this series, age ranging from 12-35 years. The duration of ventilation ranged from 1-21 days and the interval from decannulation to development of stridor was between 5-34 days. Six of them were approached by the cervical route, 5 by thoracotomy and cervical approach, 2 via median sternotomy and 3 by thoracotomy alone. Five of them required an additional laryngeal drop and 1 required pericardiotomy and release of pulmonary veins to gain additional length. The excised segments of trachea measured 3 to 5 cms in length. All were end to end anastomosis with interrupted Vicryl sutures. We have had no experience with stents or prosthetic tubes. Three patients developed anastomotic leaks which were controlled conservatively. Almost all of them required postoperative tracheo-bronchial suctioning with fibreoptic bronchoscope. We had one death in this series due to sepsis. PMID:9914459

  3. Leiomiosarcoma endovascular en vena cava inferior con síndrome de Budd-Chiari asociado: a propósito de un caso Endovascular Leiomyosarcoma ofthe Inferior Vena Cava with Budd-Chiari syndrome: a case report

    Directory of Open Access Journals (Sweden)

    David Ibáñez Muñoz

    2011-09-01

    Full Text Available Presentamos el caso de una mujer de 56 años de edad, que acude al Servicio de Urgencias de nuestro centro por un cuadro de distensión y dolor abdominal difuso con edemas en extremidades inferiores. En los estudios de imagen realizados (ecografía y TC se demostró la existencia de ocupación intraluminal de la vena cava inferior, por una masa que se extendía desde el drenaje de las venas renales hasta su confluencia en la aurícula derecha, con signos de obstrucción de las venas suprahepáticas. El diagnóstico anatomopatológico final fue de leiomiosarcoma con síndrome de Budd-Chiari asociado. El leiomiosarcoma de vena cava inferior es una patología poco frecuente y su asociación con síndrome de Budd-Chiari es aún más excepcional.We report the case of a 56-year-old woman who presented at our Emergency Department with symptoms ofdiffuse abdominal pain and distention with lower-extremity edema. Imaging studies (ultrasound and computed tomography showed an intraluminar inferior vena cava mass extending from the renal veins drain to their confluence at the right atrium, with signs of obstruction of the suprahepatic veins. The final pathology diagnosis was leiomyosarcoma with Budd-Chiari syndrome. The leiomyosarcoma of the inferior vena cava is an infrequent pathology and its association with Budd-Chiari syndrome is even rarer.

  4. Bilhemia: a fatal complication following percutaneous placement of a transhepatic inferior vena cava catheter in a child

    International Nuclear Information System (INIS)

    A transhepatic central venous catheter was implanted in a 2-year-old child with a history of multiple venous access procedures and superior and inferior vena cava thrombosis. After 2 weeks, inadvertent dislodgement of the catheter was complicated by a biloma. The biloma was percutaneously drained, but a biliary-venous fistula led to a rapidly progressive and fatal bilhemia. We report this case as an infrequent complication of transhepatic catheterization. (orig.)

  5. Bilhemia: a fatal complication following percutaneous placement of a transhepatic inferior vena cava catheter in a child

    Energy Technology Data Exchange (ETDEWEB)

    Sierre, Sergio; Lipsich, Jose; Questa, Horacio [Hospital de Pediatria Prof JP Garrahan, Department of Interventional Radiology, Buenos Aires (Argentina)

    2007-05-15

    A transhepatic central venous catheter was implanted in a 2-year-old child with a history of multiple venous access procedures and superior and inferior vena cava thrombosis. After 2 weeks, inadvertent dislodgement of the catheter was complicated by a biloma. The biloma was percutaneously drained, but a biliary-venous fistula led to a rapidly progressive and fatal bilhemia. We report this case as an infrequent complication of transhepatic catheterization. (orig.)

  6. Congenital Aortocaval Fistula from Right Subclavian Artery to Superior Vena Cava in an Adult with Tetralogy of Fallot

    Directory of Open Access Journals (Sweden)

    Soheila Chamanian

    2014-11-01

    Full Text Available Congenital   aortocaval   fistula in association with complex congenital heart disease has never been described before. We represent an adult with tetralogy of fallot and an undiagnosed subclavian artery to superior vena cava fistula in previous catheterisms. He underwent surgical correction, successfully. After 8 months post operation he was doing well with improved functional capacity and no cyanosis.

  7. Renal Artery Stump to Inferior Vena Cava Fistula: Unusual Clinical Presentation and Transcatheter Embolization with the Amplatzer Vascular Plug

    International Nuclear Information System (INIS)

    Fistulous communication between the renal artery stump and inferior vena cava following nephrectomy is rare. We describe the case of a 52-year-old man with a fistula detected on investigation for hemolytic anemia in the postoperative period. The patient had had a nephrectomy performed 2 weeks prior to presentation for blunt abdominal trauma. The fistula was successfully occluded percutaneously using an Amplatzer vascular plug. The patient recovered completely and was discharged 2 weeks later.

  8. Posterior Nutcracker Syndrome Associated with Interrupted Left Inferior Vena Cava with Azygos Continuation and Retroaortic Right Renal Vein

    OpenAIRE

    Luo, Xiao-Li; Qian, Gen-Nian; Xiao, Hui; Zhao, Chun-Lei; Zhou, Xiao-Dong

    2012-01-01

    Various anatomic anomalies have been considered the causes of nutcracker syndrome (NCS). Posterior NCS refers to the condition, in which vascular narrowing was secondary to the compression of the retroaortic left renal vein while it is crossing between the aorta and the vertebral column. Here, we report an unusual case of posterior NCS associated with a complicated malformation of the interrupted left inferior vena cava with azygos continuation and retroaortic right renal vein, diagnosed by b...

  9. Posterior Nutcracker Syndrome Associated with Interrupted Left Inferior Vena Cava with Azygos Continuation and Retroaortic Right Renal Vein

    International Nuclear Information System (INIS)

    Various anatomic anomalies have been considered the causes of nutcracker syndrome (NCS). Posterior NCS refers to the condition, in which vascular narrowing was secondary to the compression of the retroaortic left renal vein while it is crossing between the aorta and the vertebral column. Here, we report an unusual case of posterior NCS associated with a complicated malformation of the interrupted left inferior vena cava with azygos continuation and retroaortic right renal vein, diagnosed by both color Doppler ultrasonography and CT angiography.

  10. GCS as a predictor of mortality in patients with traumatic inferior vena cava injuries: a retrospective review of 16 cases

    OpenAIRE

    Cudworth, Michael; Fulle, Angelo; Ramos, Juan P; Arriagada, Ivette

    2013-01-01

    Introduction Recent research has determined Glasgow Coma Scale (GCS) to be an independent predictor of mortality in patients with traumatic inferior vena cava (IVC) injuries. The aim of this study was to evaluate the use of GCS, as well as other factors previously described as determinants of mortality, in a cohort of patients presenting with traumatic IVC lesions. Methods A 7-year retrospective review was undertaken of all trauma patients presenting to a tertiary care trauma center with trau...

  11. A prebiotic effect of Ecklonia cava on the growth and mortality of olive flounder infected with pathogenic bacteria.

    Science.gov (United States)

    Lee, WonWoo; Ahn, Ginnae; Oh, Jae Young; Kim, Seung Min; Kang, Nalae; Kim, Eun A; Kim, Kil-Nam; Jeong, Joon Bum; Jeon, You-Jin

    2016-04-01

    Olive flounder (Paralichthys olivaceus), also known as the Japanese flounder in Japan, is one of the most important commercial marine finfish species cultured in Korea and Japan. The purpose of this study was to evaluate how a species of brown algae (Ecklonia cava, E. cava) affects the growth rate of olive flounder and its immune response to pathogenic bacteria. First, the experimental fish were divided into four groups: the control group was fed the diet containing only 1.0% Lactobacillus plantarum (L. plantarum), group I was fed 1.0% L. plantarum and 1.0% E. cava (EC), group II was fed 1.0% L. plantarum and 0.1% ethanol extract of EC (EE), and group III was fed 1.0% L. plantarum and 0.5% EE. The diets fed to the fish twice a day for 16 weeks. The results indicated that supplementation with 1.0% EC and 0.1% EE improved the growth and body weight of olive flounder, and decreased its mortality. This diet, however, did not significantly affect the biochemical profiles of the experimental flounder. The supplementation of 1.0% EC also enhanced the innate immune response of the fish, as evidenced by the high respiratory burst, and increased serum lysozyme and myeloperoxidase activity. The addition of 1.0% EC and either 0.1% or 0.5% EE also decreased the accumulative mortality of olive flounder infected by pathogenic bacteria (Edwardsiella tarda, Streptococcus iniae, and Vibrio harveyi). Overall, these results suggest that E. cava can act as a prebiotic by improving the innate immune response in fish infected with pathogenic bacteria as increased the growth of the probiotic. PMID:26921543

  12. Inferior vena cava filter placement for the prevention of pulmonary embolism and the complications related to the filter placement

    International Nuclear Information System (INIS)

    Objective: To investigate the effects of inferior vena cava (IVC) filter placement for the prevention of fatal pulmonary embolism and to discuss the management of complications related to the filter placement. Methods: Seventy patients with proved deep vein thrombosis of lower extremity underwent inferior vena cava filter placement.A total of 72 IVC filters were implanted,which included 20 Trap Ease filters, 31 Vena Tech filters, 13 retrievable OptEaseTM filters and 8 Tempo II filters. One filter was deployed above the orifice of renal vein and the remaining 71 were deployed below the orifice of renal vein. Results: All the patients were followed up for 8-72 months after the procedure. During the follow-up period no fatal pulmonary embolism occurred except that some complications related to the filter placement occurred in 6 cases. Conclusion: Inferior vena cava filter placement can effectively prevent the occurrence of pulmonary embolism. Of course, this treatment should be strictly applied according to the indications. (authors)

  13. Experimental evaluation of a new retrievable inferior vena cava filter for protection from acute pulmonary embolism in canine

    International Nuclear Information System (INIS)

    Objective: To evaluate the validity, safety and feasibility of a new retrieval inferior vena cava filter for the prevention of pulmonary embolism in an animal model. Methods: The model of deep iliofemoral venous thrombosis was established in 12 experimental dogs. In control group(6 experimental dogs), the deep venous thrombosis was made to fall off directly. In experimental group (6 experimental dogs), the deep venous thrombosis was made to fall off with an implanted filter in inferior vena cava. The filter's thrombus-trapping efficacy was evaluated by angiography of pulmonary artery, measurement of the mean pressure of pulmonary artery and arterial oxygen saturation before and after the deep venous thrombus falling off. Results: All filters implanted in the experimental dogs could successfully capture clot coming from deep venous thrombosis. There was no case of pulmonary embolism in experimental groups. On the other hand, pulmonary embolism occurred following the fall of deep venous thrombus in all dogs of control group. Conclusion: The retrievable inferior vena cava filter can effectively prevent from the pulmonary embolism due to falling off of the emboli from deep venous thrombosis. The process of implantation and retrieval is relatively simple and easy. (authors)

  14. Polyphenol-Rich Fraction of Ecklonia cava Improves Nonalcoholic Fatty Liver Disease in High Fat Diet-Fed Mice

    Directory of Open Access Journals (Sweden)

    Eun-Young Park

    2015-11-01

    Full Text Available Ecklonia cava (E. cava; CA is an edible brown alga with beneficial effects in diabetes via regulation of various metabolic processes such as lipogenesis, lipolysis, inflammation, and the antioxidant defense system in liver and adipose tissue. We investigated the effect of the polyphenol-rich fraction of E. cava produced from Gijang (G-CA on nonalcoholic fatty liver disease (NAFLD in high-fat diet (HFD-fed mice. C57BL6 mice were fed a HFD for six weeks and then the HFD group was administered 300 mg/kg of G-CA extracts by oral intubation for 10 weeks. Body weight, fat mass, and serum biochemical parameters were reduced by G-CA extract treatment. MRI/MRS analysis showed that liver fat and liver volume in HFD-induced obese mice were reduced by G-CA extract treatment. Further, we analyzed hepatic gene expression related to inflammation and lipid metabolism. The mRNA expression levels of inflammatory cytokines and hepatic lipogenesis-related genes were decreased in G-CA-treated HFD mice. The mRNA expression levels of cholesterol 7 alpha-hydroxylase 1 (CYP7A1, the key enzyme in bile acid synthesis, were dramatically increased by G-CA treatment in HFD mice. We suggest that G-CA treatment ameliorated hepatic steatosis by inhibiting inflammation and improving lipid metabolism.

  15. Breast Reconstruction and Prosthesis

    Science.gov (United States)

    ... have breast reconstruction If you choose to have reconstructive surgery, follow these steps: STEP 1 — Ask your doctor to refer you to a plastic surgeon who is an expert in breast reconstruction. ...

  16. Gas hazard assessment in a densely inhabited area of Colli Albani Volcano (Cava dei Selci, Roma)

    Science.gov (United States)

    Carapezza, M. L.; Badalamenti, B.; Cavarra, L.; Scalzo, A.

    2003-04-01

    The northwestern flank of the Colli Albani, a Quaternary volcanic complex near Rome, is characterised by high pCO 2 values and Rn activities in the groundwater and by the presence of zones with strong emission of gas from the soil. The most significant of these zones is Cava dei Selci where many houses are located very near to the gas emission site. The emitted gas consists mainly of CO 2 (up to 98 vol%) with an appreciable content of H 2S (0.8-2%). The He and C isotopic composition indicates, as for all fluids associated with the Quaternary Roman and Tuscany volcanic provinces, the presence of an upper mantle component contaminated by crustal fluids associated with subducted sediments and carbonates. An advective CO 2 flux of 37 tons/day has been estimated from the gas bubbles rising to the surface in a small drainage ditch and through a stagnant water pool, present in the rainy season in a topographically low central part of the area. A CO 2 soil flux survey with an accumulation chamber, carried out in February-March 2000 over a 12 000 m 2 surface with 242 measurement points, gave a total (mostly conductive) flux of 61 tons/day. CO 2 soil flux values vary by four orders of magnitude over a 160-m distance and by one order of magnitude over several metres. A fixed network of 114 points over 6350 m 2 has been installed in order to investigate temporal flux variations. Six surveys carried out from May 2000 to June 2001 have shown large variations of the total CO 2 soil flux (8-25 tons/day). The strong emission of CO 2 and H 2S, which are gases denser than air, produces dangerous accumulations in low areas which have caused a series of lethal accidents to animals and one to a man. The gas hazard near the houses has been assessed by continuously monitoring the CO 2 and H 2S concentration in the air at 75 cm from the ground by means of two automatic stations. Certain environmental parameters (wind direction and speed; atm P, T, humidity and rainfall) were also

  17. Early and Late Retrieval of the ALN Removable Vena Cava Filter: Results from a Multicenter Study

    International Nuclear Information System (INIS)

    Retrieval of removable inferior vena cava (IVC) filters in selected patients is widely practiced. The purpose of this multicenter study was to evaluate the feasibility and results of percutaneous removal of the ALN removable filter in a large patient cohort. Between November 2003 and June 2006, 123 consecutive patients were referred for percutaneous extraction of the ALN filter at three centers. The ALN filter is a removable filter that can be implanted through a femoral/jugular vein approach and extracted by the jugular vein approach. Filter removal was attempted after an implantation period of 93 ± 15 days (range, 6-722 days) through the right internal jugular vein approach using the dedicated extraction kit after control inferior vena cavography. Following filter removal, vena cavograms were obtained in all patients. Successful extraction was achieved in all but one case. Among these successful retrievals, additional manipulation using a femoral approach was needed when the apex of the filter was close to the IVC wall in two patients. No immediate IVC complications were observed according to the postimplantation cavography. Neither technical nor clinical differences between early and late filter retrieval were noticed. Our data confirm the safety of ALN filter retrieval up to 722 days after implantation. In infrequent cases, additional endovenous filter manipulation is needed to facilitate extraction.

  18. Dynamic Limb Bioimpedance and Inferior Vena Cava Ultrasound in Patients Undergoing Hemodialysis.

    Science.gov (United States)

    Tiba, Mohamad H; Belmont, Barry; Heung, Michael; Theyyunni, Nik; Huang, Robert D; Fung, Christopher M; Pennington, Amanda J; Cummings, Brandon C; Draucker, Gerard T; Shih, Albert J; Ward, Kevin R

    2016-01-01

    Assessment of volume status in critically ill patients poses a challenge to clinicians. Measuring changes in the inferior vena cava (IVC) diameter using ultrasound is becoming a standard tool to assess volume status. Ultrasound requires physicians with significant training and specialized expensive equipment. It would be of significant value to be able to obtain this measurement continuously without physician presence. We hypothesize that dynamic changes in limb's bioimpedance in response to respiration could be used to predict changes in IVC. Forty-six subjects were tested a hemodialysis session. Impedance was measured via electrodes placed on the arm. Simultaneously, the IVC diameter was assessed by ultrasound. Subjects were asked to breathe spontaneously and perform respiratory maneuvers using a respiratory training device. Impedance (dz) was determined and compared with change in IVC diameter (dIVC; r = 0.76, p < 0.0001). There was significant relationship between dz and dIVC (p< 0.0001). Receiver-operator curves for dz at thresholds of dIVC (20% to70%) demonstrated high predictive power with areas under the curves (0.87-0.99, p < 0.0001). This evaluation suggests that real-time dynamic changes in limb impedance are capable of tracking a wide range of dynamic dIVC. This technique might be a suitable surrogate for monitoring real-time changes in dIVC to assess intravascular volume status. PMID:26919184

  19. Radiological diagnosis of total anomalous pulmonary venous connection with right superior vena cava

    International Nuclear Information System (INIS)

    Objective: To evaluate radiographic diagnosis in total anomalous pulmonary venous connection with right superior vena cava (RSVC-TAPVC) and analyze the variant of its pulmonary venous connection and the influence on surgical operation. Methods: In 11 patients who were diagnosed by angiocardiography and confirmed by surgical operation, all chest radiographs were studied retrospectively and compared with their angiocardiography and surgical results. The variant of pulmonary venous connection was analyzed and the influence on surgical operation was also discussed. Results: 6 patients showed 'right hemi-snowman sign' in posteroanterior view and 3 showed a pre-tracheal density on the lateral view or other sign caused by drainage vein. 6 of 9 angio-cardiographs showed pulmonary or drainage venous stenosis. There were 2, 4 and 3 cases respectively whose right pulmonary veins connected with common pulmonary or drainage veins in one, two, and three branches. 2 of 3 died cases were caused by mistaken ligation of right superior pulmonary vein during the operation. Conclusion: About 82% cases of the RSVC-TAPVC can be diagnosed by chest radiograph because of the 'right hemi-snowmen sign' and other supplementary signs. In about 78% cases, the right pulmonary veins join right drainage (or connecting) vein in two or more branches at separate levels and this variant has surgical implications

  20. Nephron Sparing Surgery for Renal Angiomyolipoma with Inferior Vena Cava Thrombus in Tuberous Sclerosis

    Directory of Open Access Journals (Sweden)

    Adrien Riviere

    2014-01-01

    Full Text Available Introduction. Angiomyolipoma is a common benign renal tumor. It is associated with Tuberous Sclerosis Complex (TSC in 20% of patients. Angiomyolipomas are classically multiple, bilateral, and growing; they may lead to complications such as Wunderlich syndrome or, in rare cases, to venous extension. Observation. a 74-year-old woman with TSC presented with an angiomyolipoma of the right kidney with inferior vena cava (IVC fatty thrombus. She underwent partial nephrectomy and thrombectomy. After a 7-year follow-up there was no evidence of recurrence or metastasis and her renal function was preserved. Review of Literature. It is the 44th reported angiomyolipoma associated with IVC thrombus. The mean size of angiomyolipomas was 86.1 mm and 67.4% of patients were symptomatic. Pulmonary embolism was found in 6 patients. There were 2 cases of recurrence/metastatic outcome after radical nephrectomy and thrombectomy. They were associated with epithelioid form. The mean size of epithelioid tumors was significantly bigger than in classical angiomyolipomas (127.1 mm versus 82.6 mm, P=0.037. With a median follow-up of 12 months, 91.3% of patients were recurrence and metastasis free, with 3 cases of nephron sparing surgery. Conclusion. Nephron sparing surgery for angiomyolipoma with IVC fatty thrombus can be safely performed in TSC, even in sporadic angiomyolipoma.

  1. Persistent left superior vena cava mistaken for nodal metastasis: a case report

    Directory of Open Access Journals (Sweden)

    Papandrinopoulou Dimitra

    2010-06-01

    Full Text Available Abstract Introduction Evaluation of the mediastinum is crucial for patients with lung cancer. Mediastinal lymph node metastases play a dramatic role in the process of staging. Physicians should be aware of the potential pitfalls regarding mediastinal evaluation. This case report provides an example. Case presentation We report the case of a 57-year-old Caucasian man who presented with a four-month history of non-productive cough. He was diagnosed with non-small cell lung cancer. Initially, it was thought to be inoperable due to the presence of a para-aortic lymph node. A more careful examination of the mediastinum revealed that the "lymph node" was in fact a persistent left superior vena cava. Conclusions This study highlights the difficulties in mediastinal staging, especially when intravenous contrast is not used. The recognition of this vascular malformation dramatically changed the therapeutic decisions, giving our patient the opportunity of surgical resection. To the best of our knowledge, such correlation has not been described in English literature.

  2. Catheterobronchial fistula due to vena cava superior thrombosis as a late complication of ventriculoatrial shunt.

    Science.gov (United States)

    Parízek, J; Nytra, T; Zemánková, M; Eliás, P; Sercl, M; Nĕmecková, J; Jakubec, J

    1994-09-01

    A case of a catheterobronchial fistula as a rare late complication of a ventriculoatrial shunt is reported. The ventriculoatrial shunt was implanted in a 4-month-old boy suffering from extreme postinfectious hydrocephalus. During the following years, twelfth nerve palsy on the right, vertebralgias, and salty taste sensations in the mouth associated with intermittent coughing and swelling of the neck and supraclavicular region on the right side developed. Valvography established a diagnosis of fistula 12 years after the implantation of a shunt. Ultrasonography of the neck and mediastinum and contrast-enhanced dynamic computed tomographic scanning demonstrated a catheterobronchial fistula to the subsegmental bronchus of the anterior segment of the right upper lung lobe, a thrombosis of the right internal jugular and both right and left brachiocephalic veins and the superior vena cava, and an extensive collateral venous system mainly draining into the azygos vein. Normalization of cerebrospinal fluid and blood flow and pressure allowed extraction of the "atrial" catheter without complications. One year after surgery the boys is in good health and without signs of shunt dependence. PMID:7842439

  3. Titanium greenfield inferior vena cava filter; effectiveness of percutaneous placement for prevention of pulmonary embolism

    Energy Technology Data Exchange (ETDEWEB)

    Jeong, Bong Gak; Hahn, Seong Tai; Jung, Jung Im; Lee, Sang Hoon; Koh, Ki Young; Park, Seog Hee; Shinn, Kyung Sub [The Catholic Univ. of Korea, Seoul (Korea, Republic of)

    2000-11-01

    To evaluate the effectiveness of percutaneous placement of a Greenfield titanium filter in the inferior vena cava (IVC) for the prevention of pulmonary embolism (PE) in patients with deep vein thrombosis (DVT). Twelve patients with DVT underwent percutaneous Greenfield titanium filter placement. The indications included recurrent pulmonary embolism or failed anticoagulation therapy in six patients, extensive PE in three, and prophylaxis for high risk of PE in the remaining three. In all cases the filter was positioned after confirming the anatomy, patency, and presence of thrombosis of the IVC and renal veins by inferior vena cavography. Long-term follow-up study involved clinical evaluation, plain radiography, Doppler ultrasonography and CT scanning. Filter placement [infrarenal in ten patients (83%) and suprarenal in two (17%)] was technically successful in all cases (100%). The venous approach involved the right femoral vein in eight patients (67%) and the right internal jugular vein in four (33%). Complications included overlapping of the filter legs in three patients (25%), and misplacement in one (8%). After filter placement, no further PE developed. In all of five patients followed up for two years, the IVC maintained patency without evidence of caval perforation or occlusion. In patients with DVT, percutaneous placement of a Greenfield titanium filter is a safe and effective method for the prevention of PE.

  4. Role of inferior vena cava filter implantation in preventing pulmonary embolism

    International Nuclear Information System (INIS)

    A retrospective review of all patients undergoing IVC filter implantation at Shifa International Hospital, Islamabad, from June 2004 to June 2006 was conducted to study the indications of inferior vena cava (IVC) filter use and impact on short-term morbidity/mortality. A total of 17 patients received IVC filters. Five patients were excluded due to data loss. One month clinical followup was available for 12 patients and 6 months follow-up was also available for 4 of 12 patients. The underlying disease was deep venous thrombosis (DVT) with pulmonary embolism (PE) in 6 (50%), DVT without PE in 4 (33.3%) and PE with negative duplex scan for DVT in 2 (16.6%) patients, respectively. Indications for IVC filter implantation were DVT and/or PE with contraindication to anticoagulation in 8 (66.7%) and DVT and/or PE with complications of anticoagulation in 4 (33.3%) patients. No procedure-related complications were noted in all 17 patients. Three patients (25%) died of non-PE related causes during the 1st month. There were no PE related mortalities at 6 months. This data set indicates that IVC filter implantation is a safe procedure with no short-term morbidity/mortality and potential long-term mortality benefit. (author)

  5. Titanium greenfield inferior vena cava filter; effectiveness of percutaneous placement for prevention of pulmonary embolism

    International Nuclear Information System (INIS)

    To evaluate the effectiveness of percutaneous placement of a Greenfield titanium filter in the inferior vena cava (IVC) for the prevention of pulmonary embolism (PE) in patients with deep vein thrombosis (DVT). Twelve patients with DVT underwent percutaneous Greenfield titanium filter placement. The indications included recurrent pulmonary embolism or failed anticoagulation therapy in six patients, extensive PE in three, and prophylaxis for high risk of PE in the remaining three. In all cases the filter was positioned after confirming the anatomy, patency, and presence of thrombosis of the IVC and renal veins by inferior vena cavography. Long-term follow-up study involved clinical evaluation, plain radiography, Doppler ultrasonography and CT scanning. Filter placement [infrarenal in ten patients (83%) and suprarenal in two (17%)] was technically successful in all cases (100%). The venous approach involved the right femoral vein in eight patients (67%) and the right internal jugular vein in four (33%). Complications included overlapping of the filter legs in three patients (25%), and misplacement in one (8%). After filter placement, no further PE developed. In all of five patients followed up for two years, the IVC maintained patency without evidence of caval perforation or occlusion. In patients with DVT, percutaneous placement of a Greenfield titanium filter is a safe and effective method for the prevention of PE

  6. Bird's nest versus the Kimray-Greenfield inferior vena cava filter: Randomized clinical study

    International Nuclear Information System (INIS)

    A randomized clinical study was conducted comparing the percutaneously introduced bird's nest inferior vena cava (IVC) filter and the Kimray-Greenfield IVC filter. Study end points included recurrent pulmonary embolism, new or worse leg venous stasis symptoms, IVC thrombosis, and ease of filter introduction. Of the 109 patients in the study, 58 were randomly assigned to the BN and 51 to the KG filter. Demographic factors were comparable between the two groups. Follow-up entailed cavography, noninvasive assessment of the femoral veins, and standardized telephone interviews. The follow-up period was extended to 1 year after filter insertion. Results for the bird's nest versus the Kimray-Greenfield filter respectively were as follows: death due to massive pulmonary embolism, 3% versus 5%; recurrent pulmonary embolism, 1.5% versus 7.5%; filter migration, 1.1% versus 0.0%; IVC thrombosis, 6% versus 2.5%; new or worse leg edema, 28.5% versus 22%; ease of introduction (qualitative), maximal versus minimal; patient discomfort (qualitative), minimal versus maximal. The authors conclude the bird's nest filter is better than the Kimray-Greenfield filter in terms of prevention of recurrent pulmonary embolism and ease of introduction. In terms of venous stasis, the bird's nest filter is not better and may be worse than the Kimray-Greenfield filter. Filter migration is a problem with the bird's nest filter

  7. On determining the characteristics of a Greenfield Inferior Vena Cava Filter using CFD

    Science.gov (United States)

    Swaminathan, Tirumani; Hu, Howard; Patel, Aalpen

    2004-11-01

    In those patients with deep venous thrombosis (DVT) or those at a high risk for DVT, and who have contraindications to or are unresponsive to anticoagulation therapy, vena cava filters are often used to prevent recurrent pulmonary emboli. Ideally, the filter should be efficacious while being non-thrombogenic and non-impeding to the blood flow. In reality, the filter has to establish a balance between clot capture efficiency and flow impedance before and after clot capture. The development and use of numerical tools to study the characteristics of filters and its application to the case of a Greenfield filter has been presented here. A detailed model resolving the flow field around the filter to a fine detail is described. The thrombogenecity of the filter in un-occluded flows is determined by analyzing plots of shear stresses and velocity fields. To evaluate a filter's clot capturing efficacy, a Thin Wire Model (TWM) has been developed and used in conjunction with a moving finite element scheme to study the probability of clot capturing for the Greenfield filter.

  8. Fibrosing mediastinitis with superior vena cava obstruction as the initial presentation of Langerhans' cell histiocytosis in a young child

    International Nuclear Information System (INIS)

    We present a 2-year-old girl with an unusual presentation of Langerhans' cell histiocytosis (LCH). Five months prior to admission to our hospital, she received IV steroids for bronchial obstruction. On admission, clinical signs of SVC obstruction were evident and a mediastinal mass was evident on the chest radiograph and MRI. Biopsy revealed fibrosing mediastinitis. Five months later, osteolysis was present on a skull radiograph. Surgical biopsy of the skull lesion revealed LCH. This case is unique because it demonstrates a rare initial manifestation of LCH that has not been previously reported. Furthermore, the primary, solitary mediastinal manifestation without calcifications was histologically interpreted as fibrosing mediastinitis, and the final diagnosis of LCH was only made after identifying the skull lesion. (orig.)

  9. Characterization and Formation of longitudinal pinch-out geometries in turbidite systems: the Pïera Cava syncline (Annot Sandstone Formation)

    Science.gov (United States)

    Daghdevirenian, Laurent; Migeon, Sébastien; Rubino, Jean-loup; Gorini, Christian

    2014-05-01

    The Grès d'Annot sandstones of Late Eocene/early Oligocene is a well-known example of turbidite accumulations deposited in a foreland basin setting. In such settings, turbidite systems are usually laterally control by syntectonic activity generating lateral pinch-outs of the infilling accumulation against the basin walls. Such tectonic activity together with progradation and retrogradation stages of the whole turbidite system could also lead to local disconnection between the continental-slope and the basin deposits and to the formation of sealed potential sand-rich reservoirs. The aim of the work is to better constrain how turbidite systems pinch out longitudinally, in both upstream and downstream directions and to characterize some typical lithofacies evolutions. Our work focused on the Peîra Cava syncline (Maritime Alps, France) where particles are sourced from the Maures, Esterel and Corso-Sarde mountains and flow towards the north following structurally-controlled conduits. Thirty lithological logs 100-m thick were acquired following the western N170-trending side of the syncline. Correlations made between the various sections allowed reconstructing the topography of the top of the blue marls that existed before the emplacement of the turbidite accumulation. This reconstruction revealed the occurrence of two types of longitudinal pinch-out geometries against relatively high-slope angles, and trending either downcurrent or upcurrent. The strongest evolution of depositional facies is observed close to upstream pinch-out surfaces. Here, turbidite deposits thin and fine longitudinally while cohesive debris-flow deposits stop over distances as short as 200 m. Then, going upward in the serie above the pinch-out surface, both turbidite and debris-flow deposits are lesser affected and finally become continuous. These observations allowed defining a depositional model for gravity flows within a confined basin. It revealed similarities with the "fill and spill" model

  10. Implante intencional de filtros de veia cava em ambas as veias ilíacas comuns: relato de caso e revisão da literatura Intentional placement of vena cava filters in both iliac veins: case report and literature review

    Directory of Open Access Journals (Sweden)

    Daniel Queiroz Neves

    2010-12-01

    Full Text Available Os filtros de veia cava são utilizados para impedir a passagem de êmbolos dos membros inferiores para as artérias pulmonares e, normalmente, são colocadas imediatamente abaixo das veias renais. Em alguns casos, no entanto, existem dificuldades técnicas incomuns que devem ser superadas para tratar adequadamente alguns pacientes. Relatamos o caso de uma paciente em cujas veias ilíacas comuns foram implantados filtros de veia cava devido à baixa implantação das veias renais e da veia cava inferior curta.Vena cava filters are used to prevent the passage of emboli from the lower limbs to the pulmonary arteries and normally are placed immediately below the renal veins. In some cases however there are unusual technical difficulties that must be overcome to properly treat some patients. We report a case of a patient in whose common iliac veins vena cava filters were deployed, due to the lower implantation of renal veins and a short inferior vena cava.

  11. Estrutura, ultraestrutura e morfometria da veia cava de paca (Cuniculus paca Linnaeus, 1766 criada em cativeiro

    Directory of Open Access Journals (Sweden)

    Sérgio Pinter Garcia Filho

    2013-05-01

    Full Text Available A paca (Cuniculus paca é o segundo maior roedor da fauna brasileira. Apresenta carne de excelente qualidade, o que incentiva a criação comercial. Além disso, este animal pode tornar-se uma opção válida em experimentação embora poucas sejam as informações detalhadas sobre sua morfologia. Assim, objetivou-se descrever a morfologia, morfometria e ultraestrutura de segmentos das porções cranial e caudal da veia cava de quatro pacas (Cuniculus paca adultas excedentes do plantel do Setor de Animais Silvestres do Departamento de Zootecnia da FCAV-Unesp. Os segmentos venosos foram analisados à microscopia de luz e à microscopia eletrônica de varredura. Foram mensuradas as espessuras do complexo formado pelas túnicas íntima e média, além da túnica adventícia e analisou-se os resultados pela estatística descritiva, teste "T" pareado (p<0,05. Em relação à espessura das túnicas estudadas, comprovou-se que os valores da espessura das túnicas íntima, média e adventícia, para todos os animais, foram significativamente maiores no segmento cranial. As camadas das paredes dos vasos apresentaram variações entre si quanto à estrutura e espessura, supostamente devido a uma adaptação à exigência funcional.

  12. Seapolynol Extracted from Ecklonia cava Inhibits Adipocyte Differentiation in Vitro and Decreases Fat Accumulation in Vivo

    Directory of Open Access Journals (Sweden)

    Hui-Jeon Jeon

    2015-12-01

    Full Text Available Seapolynol (SN is a polyphenol mixture derived from Ecklonia cava. We evaluated the effects of SN on lipid accumulation in adipocytes, zebrafish, and mice. SN effectively inhibited lipid accumulation in three experimental models by suppressing adipogenic factors. Triglyceride synthetic enzymes such as diacylglycerol acyltransferase 1 (DGAT1 and GPAT3 were also downregulated by SN. This SN-induced inhibition of adipogenic factors was shown to be due to the regulatory effect of SN on early adipogenic factors; SN downregulated the expression of Krueppel-like factor 4 (KLF4, KLF5, CCAAT-enhancer-binding protein β (C/EBPβ, C/EBPδ, and Protein C-ets-2 (ETS2, while KLF2, an anti-early adipogenic factor, was upregulated by SN. SN-mediated inhibition in early adipogenesis was closely correlated with the inhibition of mitotic clonal expansion via cell cycle arrest. SN inhibited cell cycle progression by suppressing cell cycle regulators, such as cyclin A, cyclinD, and pRb but increased p27, a cell cycle inhibitor. In a mouse study, SN effectively reduced body weight and plasma lipid increases induced by a high-fat diet; triglycerides, total cholesterol, and low-density lipoprotein (LDL levels were markedly reduced by SN. Moreover, SN remarkably improved high-fat-diet-induced hepatic lipid accumulation. Furthermore, SN activated AMP-activated protein kinase-α (AMPKα, an energy sensor, to suppress acetyl-coA carboxylase (ACC, inhibiting lipid synthesis. Our study suggests that SN may be an edible agent that can play a positive role in prevention of metabolic disorders.

  13. Seapolynol Extracted from Ecklonia cava Inhibits Adipocyte Differentiation in Vitro and Decreases Fat Accumulation in Vivo.

    Science.gov (United States)

    Jeon, Hui-Jeon; Choi, Hyeon-Son; Lee, Yeon-Joo; Hwang, Ji-Hyun; Lee, Ok-Hwan; Seo, Min-Jung; Kim, Kui-Jin; Lee, Boo-Yong

    2015-01-01

    Seapolynol (SN) is a polyphenol mixture derived from Ecklonia cava. We evaluated the effects of SN on lipid accumulation in adipocytes, zebrafish, and mice. SN effectively inhibited lipid accumulation in three experimental models by suppressing adipogenic factors. Triglyceride synthetic enzymes such as diacylglycerol acyltransferase 1 (DGAT1) and GPAT3 were also downregulated by SN. This SN-induced inhibition of adipogenic factors was shown to be due to the regulatory effect of SN on early adipogenic factors; SN downregulated the expression of Krueppel-like factor 4 (KLF4), KLF5, CCAAT-enhancer-binding protein β (C/EBPβ), C/EBPδ, and Protein C-ets-2 (ETS2), while KLF2, an anti-early adipogenic factor, was upregulated by SN. SN-mediated inhibition in early adipogenesis was closely correlated with the inhibition of mitotic clonal expansion via cell cycle arrest. SN inhibited cell cycle progression by suppressing cell cycle regulators, such as cyclin A, cyclinD, and pRb but increased p27, a cell cycle inhibitor. In a mouse study, SN effectively reduced body weight and plasma lipid increases induced by a high-fat diet; triglycerides, total cholesterol, and low-density lipoprotein (LDL) levels were markedly reduced by SN. Moreover, SN remarkably improved high-fat-diet-induced hepatic lipid accumulation. Furthermore, SN activated AMP-activated protein kinase-α (AMPKα), an energy sensor, to suppress acetyl-coA carboxylase (ACC), inhibiting lipid synthesis. Our study suggests that SN may be an edible agent that can play a positive role in prevention of metabolic disorders. PMID:26690099

  14. Radiation dose is associated with prognosis of small cell lung cancer with superior vena cava syndrome

    Science.gov (United States)

    Wang, Zhen-Bo; Ning, Fang-Ling; Wang, Xiao-Le; Cheng, Yu-Feng; Dong, Xin-Jun; Liu, Chang-Min; Chen, Shao-Shui

    2015-01-01

    Approximately 10% of small cell lung cancer (SCLC) cases develop superior vena cava syndrome (SVCS). Many SCLC patients with SVCS have relatively limited disease, requiring curative rather than palliative treatment. Besides chemotherapy, radiotherapy is important for treating SCLC with SVCS. We retrospectively evaluated the influence of radiotherapy dose on the prognosis of 57 patients with SCLC with SVCS treated with concurrent chemoradiotherapy. The mean biological equivalent radiation dose was 71.5 Gy. We administered etoposide/cisplatin as sequential and concurrent chemotherapy. All patients received at least one cycle of concurrent chemotherapy. All patients had partial or complete response; SVCS-associated symptoms were reduced in 87.7% (50/57) of patients within 3-10 days after treatment. Radiation dose did not affect 2-year local control (74.2% vs. 80.8%). Patients who received high-dose radiation had a lower 2-year overall survival rate than those who received low-dose radiation (11.6 vs. 33%; P = 0.024). The high dose group median survival was 15.0 months (95% confidence interval [CI]: 11.2-19.0) compared with 18.7 months (95% CI: 13.9-23.6) in the low dose group. Grade 3/4 neutropenia occurred in 22/26 high dose patients (84.6%) and 21/31 low dose patients (67.7%). In the high dose group, 30.8% of patients had grade 3/4 esophagitis compared with 19.4% of low dose patients. Only 29.0% of low dose patients received < 4 cycles of chemotherapy in the first 12 weeks after treatment began compared with 46.2% of high dose patients. Concurrent chemoradiotherapy is a tolerable modality for treating stage IIIA/IIIB SCLC with SVCS. Moderate-dose radiotherapy is preferable. PMID:26064339

  15. Circulating microRNA profile in patients with membranous obstruction of the inferior vena cava

    Science.gov (United States)

    SUN, GUI-XIANG; SU, YONG; LI, YING; ZHANG, YA-FENG; XU, LI-CHUN; ZU, MAO-HENG; HUANG, SHUI-PING; ZHANG, JIN-PENG; LU, ZHAO-JUN

    2016-01-01

    Membranous obstruction of the inferior vena cava (MOVC) is a common type of Budd-Chiari syndrome. However, the pathogenesis of MOVC has not been fully elucidated. Recent studies demonstrated that microRNAs (miRNAs or miRs) are involved in multiple diseases. To the best of our knowledge, specific changes in the expression of miRNAs in MOVC patients have not been previously assessed. The present study used a microarray analysis, followed by reverse transcription-quantitative polymerase chain reaction (RT-qPCR) validation, with the aim to access the miRNA expression levels in the plasma of 34 MOVC patients, compared with those in healthy controls. The results revealed a total of 16 differentially expressed miRNAs in MOVC patients. Subsequently, RT-qPCR analysis verified the statistically consistent expression of 5 selected miRNAs (miR-125a-5p, miR-133b, miR-423-5p, miR-1228-5p and miR-1266), in line with the results of the microarray analysis. These 5 miRNAs, which were described as crucial regulators in numerous biological processes and vascular diseases, may play an important role in the pathogenesis of MOVC. Bioinformatics analysis of target genes of the differentially expressed miRNAs revealed that these predicted targets were significantly enriched and involved in several key signaling pathways important for MOVC, including the ErbB, Wnt, MAPK and VEGF signaling pathway. In conclusion, miRNAs may involve in multiple signaling pathways contributing to the pathological processes of MOVC. The present study offers an intriguing new perspective on the involvement of miRNAs in MOVC; however, the precise underlying mechanisms require further validation. PMID:26997997

  16. Inferior vena cava filters in the management of cancer-associated venous thromboembolism: a systematic review

    Directory of Open Access Journals (Sweden)

    Rachna Raman

    2011-12-01

    Full Text Available This study systematically reviews outcomes after inferior vena cava (IVC filtration in cancer-associated venous thromboembolism (VTE. A comprehensive review of the English language literature was performed using MEDLINE, COCHRANE library, Embase and CINAHL on outcomes (i.e., pulmonary embolism, recurrent DVT, postphlebitic syndrome and survival following IVC filtration in cancer-associated VTE. Fourteen studies with 2,154 cancer patients receiving IVC filters post-VTE were included. All were observational studies. The mean duration of followup was 0.7–38 months and mean patient age was 56.8– 68 years. Among study participants, 47–87% had stage 3 or 4 cancers. Of the 47–93% of filters inserted for contraindications to anticoagulation (AC, 10–33% were placed for relative contraindications. Recurrent PE was seen in 0–6%, fatal PE in 0–4.5%, recurrent DVT in 0–18.2%, postphlebitic syndrome (PPS in 0–2.7%, and IVC thrombosis (ICVT in 3% of cancer patients. Median survival post-filter insertion was 2–10 months. Evidence supporting the utility of IVC filter insertion in cancer-associated VTE is limited to observational studies only. Preliminary data demonstrate similar safety and efficacy of filters in cancer and noncancer populations. The combination of filters and anticoagulation is no more effective than either modality alone. Retrievable filters are an attractive option for prevention of VTE in the presence of temporary risk factors or temporary contraindications to anticoagulation in patients who have a reasonable life expectancy, but there is no evidence to support their preferential use in patients with advanced malignancy.

  17. Inferior vena cava filters in cancer patients: to filter or not to filter

    Directory of Open Access Journals (Sweden)

    Hikmat Abdel-Razeq

    2011-03-01

    Full Text Available Hikmat Abdel-Razeq1, Asem Mansour2, Yousef Ismael1, Hazem Abdulelah11Department of Internal Medicine, 2Department of Radiology, King Hussein Cancer Center, Amman, JordanPurpose: Cancer and its treatment are recognized risk factors for venous thromboembolism (VTE; active cancer accounts for almost 20% of all newly diagnosed VTE. Inferior vena cava (IVC filters are utilized to provide mechanical thromboprophylaxis to prevent pulmonary embolism (PE or to avoid bleeding from systemic anticoagulation in high-risk situations. In this report, and utilizing a case study, we will address the appropriate utilization of such filters in cancer patients.Methods: The case of a 43-year-old female patient with rectal cancer, who developed deep vein thrombosis following a complicated medical course, will be presented. The patient was anticoagulated with a low molecular weight heparin, but a few months later and following an episode of bleeding, an IVC filter was planned. Using the PubMed database, articles published in English language addressing issues related to IVC filters in cancer patients were accessed and will be presented.Results: Many recent studies questioned the need to insert IVC filters in advanced-stage cancer patients, particularly those whose anticipated survival is short and prevention of PE may be of little clinical benefit and could be a poor utilization of resources.Conclusion: Systemic anticoagulation can be safely offered for the majority of cancer patients. When the risk of bleeding or pulmonary embolism is high, IVC filters can be utilized. However, placement of such filters should take into consideration the stage of disease and life expectancy of such patients.Keywords: anticoagulation, bleeding, chemotherapy

  18. Collateral circulation in ferrets (Mustela putorius) during temporary occlusion of the caudal vena cava.

    Science.gov (United States)

    Calicchio, Kristina W; Bennett, R Avery; Laraio, Leonard C; Weisse, Chick; Zwingenberger, Allison L; Rosenthal, Karen L; Johnston, Matthew S; Campbell, Vicki L; Solomon, Jeffrey A

    2016-05-01

    OBJECTIVE To determine whether extent of collateral circulation would change during temporary occlusion of the caudal vena cava (CVC) in ferrets (Mustela putorius), a pressure change would occur caudal to the occlusion, and differences would exist between the sexes with respect to those changes. ANIMALS 8 adult ferrets (4 castrated males and 4 spayed females). PROCEDURES Ferrets were anesthetized. A balloon occlusion catheter was introduced through a jugular vein, passed into the CVC by use of fluoroscopy, positioned cranial to the right renal vein, and inflated for 20 minutes. Venography was performed 5 and 15 minutes after occlusion. Pressure in the CVC caudal to the occlusion was measured continuously. A CBC, plasma biochemical analysis, and urinalysis were performed immediately after the procedure and 2 or 3 days later. RESULTS All 8 ferrets survived the procedure; no differences were apparent between the sexes. Vessels providing collateral circulation were identified in all ferrets, indicating blood flow to the paravertebral venous plexus. Complications observed prior to occlusion included atrial and ventricular premature contractions. Complications after occlusion included bradycardia, seizures, and extravasation of contrast medium. Mean baseline CVC pressure was 5.4 cm H2O. During occlusion, 6 ferrets had a moderate increase in CVC pressure (mean, 24.3 cm H2O) and 2 ferrets had a marked increase in CVC pressure to > 55.0 cm H2O. CONCLUSIONS AND CLINICAL RELEVANCE Caval occlusion for 20 minutes was performed in healthy ferrets with minimal adverse effects noted within the follow-up period and no apparent differences between sexes. The CVC pressure during occlusion may be prognostic in ferrets undergoing surgical ligation of the CVC, which commonly occurs during adrenal tumor resection. PMID:27111022

  19. Use of a Trellis Device for Endovascular Treatment of Venous Thrombosis Involving a Duplicated Inferior Vena Cava

    International Nuclear Information System (INIS)

    Congenital anomalies of the inferior vena cava (IVC) are increasingly recognized with CT and venography techniques. Although many patients with IVC anomalies are asymptomatic, recent studies have suggested an association with venous thromboembolism. We report the case of a 62-year-old woman with extensive venous clot involving the infrarenal segment of a duplicated left IVC who underwent pharmacomechanical thrombectomy and tissue plasminogen activator catheter-directed thrombolysis with complete deep venous thrombosis resolution. To our knowledge this is the first reported case in the English literature of the use of a Trellis thrombectomy catheter in the setting of duplicated IVC

  20. Use of a Trellis Device for Endovascular Treatment of Venous Thrombosis Involving a Duplicated Inferior Vena Cava

    Energy Technology Data Exchange (ETDEWEB)

    Saettele, Megan R., E-mail: SaetteleM@umkc.edu [University of Missouri, Kansas City, Department of Radiology, Saint Luke' s Hospital (United States); Morelli, John N., E-mail: dr.john.morelli@gmail.com [Texas A and M University Health Science Center, Department of Radiology, Scott and White Clinic and Hospital (United States); Chesis, Paul; Wible, Brandt C. [University of Missouri, Kansas City, Department of Interventional Radiology, Saint Luke' s Hospital (United States)

    2013-12-15

    Congenital anomalies of the inferior vena cava (IVC) are increasingly recognized with CT and venography techniques. Although many patients with IVC anomalies are asymptomatic, recent studies have suggested an association with venous thromboembolism. We report the case of a 62-year-old woman with extensive venous clot involving the infrarenal segment of a duplicated left IVC who underwent pharmacomechanical thrombectomy and tissue plasminogen activator catheter-directed thrombolysis with complete deep venous thrombosis resolution. To our knowledge this is the first reported case in the English literature of the use of a Trellis thrombectomy catheter in the setting of duplicated IVC.

  1. Influence of temperature during the second fermentation and aging of sparkling wine (Cava on the properties of the foam

    Directory of Open Access Journals (Sweden)

    Esteruelas Mireia

    2015-01-01

    Full Text Available The aim of this study was to determine the influence of temperature during the second fermentation and aging of spar- kling wines (AOC Cava on their foam properties. The results indicate that sparkling wines elaborated at 12 °C have a maximum height (HM and a stable height (HS of the foam significantly higher than the corresponding ones produced at 16 °C. This better foam properties observed in sparkling wines obtained at low temperature are probably related with their higher protein and oligosaccharide concentration.

  2. Two Stage Complex Embolization of an Arteriovenous Fistula between the Right Common Iliac Artery and the Inferior Vena Cava

    Directory of Open Access Journals (Sweden)

    Marc Gingell Littlejohn

    2009-01-01

    Full Text Available

    We  present an interesting case of a symptomatic high flow AV fistula between the right common iliac artery (CIA and the inferior vena cava (IVC, successfully treated by endovascular coil embolization. The patient was found to have a right lower polar renal artery crossing the ipsilateral ureter arising from the CIA, causing pelvi-ureteric junction (PUJ obstruction and recurrent pyelonephritis.  It is hypothesized that this fistula arising from the lower polar renal artery and entering the IVC, may have occurred as a result of trauma during a previous pyeloplasty, or a pathologically induced process of angiogenesis stemming from recurrent pyelonephritis.

  3. Real-time flow - determination of vena cava inferior on two different levels via 'RACE' pulse sequence in MR

    International Nuclear Information System (INIS)

    A new and simple parameter for quantiative evaluation of liver perfusion is outlined: Post-sinusoidal quantitative measurement of the entire liver venous flow: This is a result of the differences in evaluated flow volumes at two different levels in the inferior V.cava. The first level is the height of diaphragm, and the second is situated just cranial of the renal vessels. Normal values obtained from a group of healthy volunteers are presented. A gradient-echo pulse sequence called RACE, enabling flow measurements in real-time, is outlined. (orig.)

  4. CT Findings of Intrarenal Yolk Sac Tumor with Tumor Thrombus Extending into the Inferior Vena Cava: A Case Report

    Energy Technology Data Exchange (ETDEWEB)

    Lin, Shao Chun; Li, Xue Hua; Sun, Can Hui; Feng, Shi Ting; Peng, Zhen Peng; Huang, Si Yun; Li, Zi Ping [Dept. of Radiology, The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou (China)

    2014-10-15

    Yolk sac tumor (YST) is a rare germ cell neoplasm of childhood that usually arises from the testis or ovary. The rare cases of YST in various extragonadal locations have been reported, but the primary intrarenal YST is even more uncommon. Here, we report a case of a primary intrarenal YST with tumor thrombus of the inferior vena cava and left renal vein in a 2-year-old boy, with an emphasis on the CT features. To our knowledge, this is the first reported case of an intrarenal YST with intravascular involvement.

  5. Limitations of using synthetic blood clots for measuring in vitro clot capture efficiency of inferior vena cava filters

    Directory of Open Access Journals (Sweden)

    Robinson RA

    2013-05-01

    Full Text Available Ronald A Robinson, Luke H Herbertson, Srilekha Sarkar Das, Richard A Malinauskas, William F Pritchard, Laurence W GrossmanOffice of Science and Engineering Laboratories, Center for Devices and Radiological Health, US Food and Drug Administration, Silver Spring, MD, USAAbstract: The purpose of this study was first to evaluate the clot capture efficiency and capture location of six currently-marketed vena cava filters in a physiological venous flow loop, using synthetic polyacrylamide hydrogel clots, which were intended to simulate actual blood clots. After observing a measured anomaly for one of the test filters, we redirected the focus of the study to identify the cause of poor clot capture performance for large synthetic hydrogel clots. We hypothesized that the uncharacteristic low clot capture efficiency observed when testing the outlying filter can be attributed to the inadvertent use of dense, stiff synthetic hydrogel clots, and not as a result of the filter design or filter orientation. To study this issue, sheep blood clots and polyacrylamide (PA synthetic clots were injected into a mock venous flow loop containing a clinical inferior vena cava (IVC filter, and their captures were observed. Testing was performed with clots of various diameters (3.2, 4.8, and 6.4 mm, length-to-diameter ratios (1:1, 3:1, 10:1, and stiffness. By adjusting the chemical formulation, PA clots were fabricated to be soft, moderately stiff, or stiff with elastic moduli of 805 ± 2, 1696 ± 10 and 3295 ± 37 Pa, respectively. In comparison, the elastic moduli for freshly prepared sheep blood clots were 1690 ± 360 Pa. The outlying filter had a design that was characterized by peripheral gaps (up to 14 mm between its wire struts. While a low clot capture rate was observed using large, stiff synthetic clots, the filter effectively captured similarly sized sheep blood clots and soft PA clots. Because the stiffer synthetic clots remained straight when approaching the

  6. Iliac vein thrombosis: a case report of treatment with inferior vena cava filter, urokinase and vascular stent

    International Nuclear Information System (INIS)

    Thrombolytic therapy and placement of vascular metallic stent can be used for the treatment of iliac venous stenosis and thrombosis, but these treatments increase the risk of pulmonary thromboembolism. Inferior vena cava filter was developed for the prevention of recurrent pulmonary thromboembolism due to lower extremity deep vein thrombosis and has been regarded as relatively safe and effective treatment modality. We experienced good result of combined treatment of inferior vena filter, thrombolytic therapy and placement of right iliac venous metallic stent in a patient with severe stenosis and thrombosis at both common iliac veins

  7. Focal Hepatic Hot Spot From Superior Vena Cava Occlusion Visualized on Ventilation/Perfusion Scintigraphy With Contrast-Enhanced CT Correlate.

    Science.gov (United States)

    Lawrence, Michael; Schuster, David M

    2016-05-01

    A 57-year-old woman with superior vena cava stenosis from repeated central line placements underwent ventilation/perfusion scanning after presenting with pleuritic chest pain. The ventilation/perfusion scan was not characteristic for pulmonary embolus, but perfusion images demonstrated abnormal radiotracer activity within hepatic segment 4, along with extensive collateral vessels as seen on SPECT/CT. Two months later, the patient presented with similar complaints and had a chest CT with contrast to evaluate for pulmonary embolus. This showed occlusion of the superior vena cava and arterial enhancement within segment 4 in a similar distribution to the radiotracer in the perfusion scan. PMID:26825208

  8. Breast Reconstruction After Mastectomy

    Science.gov (United States)

    ... reconstruction with or without radiotherapy. Current Opinion in Obstetrics and Gynecology 2011;23(1):44–50. [PubMed Abstract] Barry M, Kell MR. Radiotherapy and breast reconstruction: a meta-analysis. Breast ...

  9. Upper terminal of the inferior vena cava and development of the heart atriums: a study using human embryos

    Science.gov (United States)

    Hwang, Si Eun; Rodríguez-Vázquez, José Francisco; Murakami, Gen; Cho, Baik Hwan

    2014-01-01

    In the embryonic heart, the primitive atrium is considered to receive the bilateral sinus horns including the upper terminal of the inferior vena cava (IVC). To reveal topographical anatomy of the embryonic venous pole of the heart, we examined horizontal serial paraffin sections of 15 human embryos with crown-rump length 9-31 mm, corresponding to a gestational age of 6-7 weeks or Carnegie stage 14-16. The IVC was often fixed to the developing right pulmonary vein by a mesentery-like fibrous tissue. Rather than the terminal portion of the future superior vena cava, the IVC contributed to form a right-sided atrial lumen at the stage. The sinus venosus or its left horn communicated with the IVC in earlier specimens, but in later specimens, the left atrium extended caudally to separate the sinus and IVC. In contrast, the right atrium consistently extended far caudally, even below the sinus horn, along the IVC. A small (or large) attachment between the left (or right) atrium and IVC in adult hearts seemed to be derived from the left (or right) sinus valve. This hypothesis did not contradict with the incorporation theory of the sinus valves into the atrial wall. Variations in topographical anatomy around the IVC, especially of the sinus valves, might not always depend on the stages but partly in individual differences. PMID:25548721

  10. Scimitar syndrome of atypical, rare drainage of venous vessel to the superior vena cava. A case report

    International Nuclear Information System (INIS)

    Scimitar syndrome is a rare and complex congenital anomaly characterized by partial or complete anomalous pulmonary venous return from the right or left lung into the inferior vena cava, through drainage into the hepatic vein, right atrium or left atrium. The syndrome is commonly associated with hypoplasia of the right lung and right pulmonary artery. We present an 11-year-old female with atypical and rare type of scimitar syndrome. The girl has had cough for 2 months before admission, without fever or abnormalities on medical examination. X-ray films revealed inflammatory and atelectatic changes with mediastinal shift to the right. CT and CT angiography – hypoplasia of the right lung with no visible interlobar fissures. No areas of consolidation in the pulmonary parenchyma. Mediastinum shifted to the right. Single wide venous vessels draining the upper part of the right lung entering the superior vena cava. In our patient, clinical symptoms are mild, but a thorough physical examination could have helped diagnose the syndrome earlier

  11. Estimation of Right Atrial Pressure from the Inspiratory Collapse of the Inferior Vena cava in Pediatric Patients

    Directory of Open Access Journals (Sweden)

    Gholamhossein Ajami

    2010-06-01

    Full Text Available Objective: Paucity of data exists between mean right atrial pressure (RAP and inferior vena cava (IVC size and collapsibility in pediatric patients with congenital heart disease.Methods: In a prospective study, fifty consecutive pediatric patients with different congenital heart diseases who had right side cardiac catheterization were studied, comparing right atrial pressure with simultaneous M-mode echocardiographic measurement of inferior vena cava diameter. Mean age of the patients was 4.96±4.05 years (30 male and 20 female. Patients were categorized into two groups according to their right atrial pressure (RAP as measured by cardiac catheterization: Group 1 (40 patients were those with mean RAP 8 mmHg when IVC diameter in inspiration was >3.6 (sensitivity of 100%, specificity of 47.5%, +LR=1.9 or if IVC diameter was >6mm in expiration (sensitivity of 70%, specificity of 87%, +LR=4.67.Conclusion: This study showed that measurement of IVC size in inspiration and expiration can be used as a reliable method for estimation of mean right atrial pressure.

  12. Long-Term Results of Vena Cava Filters: Experiences with the LGM and the Titanium Greenfield Devices

    International Nuclear Information System (INIS)

    Purpose: Vena cava filter (VCF) application is the method of choice to prevent recurrent pulmonary embolism in patients with deep venous thrombosis. Because of the reported complications after VCF placement we summarize our long-term follow-up results with the LGM and Titanium Greenfield (TG) devices. Methods: Eighty-seven LGM VCF and 17 TG VCF were placed in 104 patients (average age 64 years). The follow-up examinations were performed by color-coded duplex sonography, plain radiographs, cavography, and computed tomo-graphy (CT). The maximum observation time was 81 months. Results: Filter migration occurred in 11% (8/76) of the LGM VCF and 15% (2/13) of the TG VCF. Vena cava thrombosis was seen in 17% (13/76) of the patients with an LGM VCF and in 31% (4/13) of those with a TG VCF. The patency rate was 95% (72/76) for the LGM VCF and 92% (12/13) for the TG VCF. Pulmonary embolism was noted in 3 patients after LGM VCF insertion and in no patient after TG VCF insertion. Conclusion: A VCF should only be inserted in a patient after pulmonary embolism and when there is strict proof of the indication

  13. Gunther Tulip Inferior Vena Cava Filter Placement During Treatment for Deep Venous Thrombosis of the Lower Extremity

    International Nuclear Information System (INIS)

    Purpose. To evaluate the efficacy and safety of Gunther tulip retrievable vena cava filter (GTF) implantation to prevent pulmonary embolism during intravenously administered thrombolytic and anticoagulation therapy and interventional radiological therapy for occlusive or nonocclusive deep venous thrombosis (DVT) of the lower extremity. Methods. We evaluated placement of 55 GTFs in 42 patients with lower extremity DVT who had undergone various treatments including those utilizing techniques of interventional radiology. Results. Worsening of pulmonary embolism in patients with existing pulmonary embolism or in those without pulmonary embolism at the time of GTF insertion was avoided in all patients. All attempts at implantation of the GTF were safely accomplished. Perforation and migration experienced by one patient was the only complication. Mean period of treatment for DVT under protection from pulmonary embolism by the GTF was 12.7 ± 8.3 days (mean ± SD, range 4-37 days). We attempted retrieval of GTFs in 18 patients in whom the venous thrombus had disappeared after therapy, and retrieval in one of these 18 cases failed. GTFs were left in the vena cava in 24 patients for permanent use when the DVT was refractory to treatment. Conclusion. The ability of the GTF to protect against pulmonary embolism during treatment of DVT was demonstrated. Safety in both placement and retrieval was clarified. Because replacement with a permanent filter was not required, use of the GTF was convenient when further protection from complicated pulmonary embolism was necessary

  14. Estimation of Right Atrial Pressure from the Inspiratory Collapse of the Inferior Vena Cava in Pediatric Patients

    Directory of Open Access Journals (Sweden)

    Hamid Amoozgar

    2010-06-01

    Full Text Available Objective:Paucity of data exists between mean right atrial pressure (RAP and inferior vena cava (IVC size and collapsibility in pediatric patients with congenital heart disease.Methods:In a prospective study, fifty consecutive pediatric patients with different congenital heart diseases who had right side cardiac catheterization were studied, comparing right atrial pressure with simultaneous M-mode echocardiographic measurement of inferior vena cava diameter. Mean age of the patients was 4.96�4.05 years (30 male and 20 female. Patients were categorized into two groups according to their right atrial pressure (RAP as measured by cardiac catheterization: Group 1 (40 patients were those with mean RAP 8 mmHg when IVC diameter in inspiration was >3.6 (sensitivity of 100%, specificity of 47.5%, +LR=1.9 or if IVC diameter was >6mm in expiration (sensitivity of 70%, specificity of 87%, +LR=4.67.Conclusion:This study showed that measurement of IVC size in inspiration and expiration can be used as a reliable method for estimation of mean right atrial pressure.

  15. Surfaces, Digitisations and Reconstructions

    DEFF Research Database (Denmark)

    Christensen, Sabrina Tang

    2015-01-01

    We present a new digital reconstruction of r-regular sets in three-dimensional Euclidean space. We introduce a vector field and analyse the relation between the topologies of the boundaries of the r-regular set and its reconstruction. This reconstruction can be carried out faster than prior model...

  16. Endovascular treatment of thrombosed inferior vena cava filters: Techniques and short-term outcomes

    Directory of Open Access Journals (Sweden)

    Mohammad Arabi

    2015-01-01

    Full Text Available Purpose: To present the techniques for endovascular treatment of thrombosed filter-bearing inferior vena cavae (IVCs, along with short-term clinical and imaging follow-up. Materials and Methods: A total of 45 consecutive patients (17 females and 28 males, aged 19-79 years (mean age of 49 years, who had IVC filter placement complicated by symptomatic acute or chronic iliocaval thrombosis and underwent endovascular therapy were studied. All patients presented with lower extremity swelling and/or pain. One patient also had bilateral lower extremity swelling and chronic gastrointestinal (GI bleeding which was secondary to chronic systemic to portal venous collaterals. Patients underwent one or more of the following endovascular treatments depending on the chronicity and extent of thrombosis: (a catheter-directed thrombolysis (CDT (n = 25, (b pharmacomechanical thrombolysis (PMT (n = 15, (c balloon angioplasty (n = 45, and/or (d stent placement across the filter (n = 42. In addition, 16 patients underwent groin arteriovenous fistula (AVF creation (36% and 3 (7% had femoral venous thrombectomy to improve flow in the recanalized iliac veins and IVCs. Results: Anatomical success was achieved in all patients. Follow-up was not available in 10 patients (lost to follow-up, n = 4; expired due to comorbidities, n = 2; lost to follow-up after re-intervention, n = 4. At a mean follow-up time of 13.3 months (range 1-48 months, clinical success was achieved in 27 patients (60%, i.e. in 21 patients without re-intervention and in 6 patients with re-intervention. Clinical success was not achieved despite re-intervention in eight patients. Higher clinical success was noted in patients who did not require repeat interventions (P = 0.03 and the time to re-intervention was significantly shorter in patients who had clinical failure (P = 0.01. AVF creation did not improve the clinical success rate (P = 1. There was no significant difference in clinical success between

  17. Safety and efficacy of interventional treatment for occlusion of the entire inferior vena cava

    International Nuclear Information System (INIS)

    Objective: To evaluate the safety and efficacy of interventional treatment of occlusion of the entire inferior vena cava (IVC). Methods: The clinical data of 6 patients with entire IVC occlusion were analyzed retrospectively. All patients were diagnosed by color Doppler ultrasound and DSA. Venography was performed under local anesthesia via internal jugular vein and femoral vein approach. The occlusion of IVC and hepatic vein were treated with balloon dilatation and/or stent placement. Follow-up examination with color Doppler ultrasound was taken 1, 3, 6, 12 months after treatment and annually thereafter to assess the patency of IVC and hepatic vein. The pressure gradient of hepatic vein-right atrium and IVC-right atrium before and after interventional treatment were compared with paired t test. Results: In 5 cases, both IVC and 1 hepatic vein were recanalized successfully. In 1 case,recanalization of IVC failed,but the right hepatic vein was recanalized successfully. The mean pressure gradient of hepatic vein-right atrium decreased from (23.2 ± 2.0) cmH2O (1 cmH2O =0.098 kPa) before treatment to (8.7 ± 3.2) cmH2O after treatment in 6 cases (t=21.6, P<0.05). The mean pressure gradient of IVC-right atrium decreased from (26.6 ± 2.7) cmH2O before treatment to (9.4 ± 1.1) cmH2O after treatment (t=16.1, P<0.05). Abdominal pains occurred in 3 patients after stent implantation which disappeared in 24 hours. No other complications such as bleeding and death occurred. During a mean follow-up of (42 ± 27) months (16 to 90 months), hepatic vein patency was maintained in 6 cases and IVC patency was maintained in 5 cases. Conclusion: Interventional treatment of occlusion of the entire IVC is a safe and effective method. (authors)

  18. Obstruction of hepatic vein or inferior vena cava after liver transplantation: the diagnosis and interventional treatment

    International Nuclear Information System (INIS)

    Objective: To investigate the diagnosis and interventional therapeutic technology for the obstruction of hepatic vein (HV) or inferior vena cava (IVC) after liver transplantation. Methods: In the 831 patients who received orthotopic liver transplantation (OLT) and 26 patients who received living donor liver transplantation (LDLT), 11 cases were confirmed with HV or IVC obstruction by venography and received interventional treatment from 2 to 111 days after liver transplantation. Of the 11 patients, five had the obstruction of HV anastomosis, five had the obstruction of IVC anastomosis, and one had the obstruction of HV and IVC anastomosis. In the eleven patients, five patients underwent OLT, four patients underwent LDLT, and two pediatric patients underwent reduced-size OLT. Before interventional treatment, 9 patients function tests, clinical sympatom, and monitoring of HV or IVC flow. Pressure gradients before and after therapeutic technology of 11 cases were retrospectively analyzed. Results: In all 11 patients, CT or MRI could clearly show congested areas of the liver, and the location and degree of HV or IVC obstruction. Of the 11 patients, four with HV obstruction and five with IVC obstruction were treated with stent placement, one with HV obstruction was treated with percutaneous transluminal angioplasty (PTA), one with HV and IVC obstruction was treated with HV PTA and IVC stent placement. Interventional technical success was achieved in all patients. The venous pressure gradient across obstruction was significantly reduced from (16.5 ± 4.1) mm Hg (1 mm Hg =0.133 kPa) before the procedure to (2.9 ± 1.7) mm Hg after the procedure (t=11.5, P<0.01). Clinical improvement was noted in 10 patients except one pediatric patient who died of multiple-organs failure at the 9 th day after the treatment. During the follow-up period of 9 to 672 days, two patients with PTA treatment had recurrent HV stenosis within one month after treatment, no patient with stent

  19. Inferior vena cava filters and postoperative outcomes in patients undergoing bariatric surgery: a meta-analysis.

    Science.gov (United States)

    Kaw, Roop; Pasupuleti, Vinay; Wayne Overby, D; Deshpande, Abhishek; Coleman, Craig I; Ioannidis, John P A; Hernandez, Adrian V

    2014-01-01

    Background: Pulmonary embolism(PE)accounts for almost 40% of perioperative deaths after bariatric surgery.Placement of prophylactic inferior vena cava(IVC) filter before bariatric surgery to improve outcomes has shown varied results. We performed a meta-analysis to evaluate post- operative outcomes associated with the preoperative placement of IVC filters in these patients. Methods: A systematic review was conducted by three investigators independently in PubMed, EMBASE, the Web of Science and Scopus until February 28,2013.Our search was restricted to studies in adult patients undergoing bariatric surgery with and without IVC filters. Primary outcomes were postoperative deep vein thrombosis(DVT),pulmonary embolism (PE),and postoperative mortality. Meta-analysis used random effects models to account for heterogeneity,and Sidik- Jonkman method to account for scarcity of outcomes and studies. Associations are shown as Relative Risks(RR) and 95% Confidence Intervals(CI). Results: Seven observational studies were identified (n=102,767), with weighted average inci- dences of DVT(0.9%),PE(1.6%),and mortality(1.0%)for a follow-up ranging from 3 weeks to 3 months. Use of IVC filters was associated with an approximately 3-fold higher risk of DVT and death that was nominally significant for the former outcome, but not the latter (RR2.81,95%CI 1.33-5.97, p=0.007; and RR 3.27,95%CI0.78-13.64, p=0.1, respectively);there was no difference in the risk of PE(RR1.02,95%CI0.31-3.77,p=0.9). Moderate to high heterogeneity of effects was noted across studies. Conclusions: Placement of IVC filter before bariatric surgery Is associated with higher risk of postoperative DVT and mortality. A similar risk of PE inpatients with and without IVC filter placement cannot exclude a benefit, given the potential large imbalance in risk at baseline.Ran- domized trials are needed before IVC placement can be recommended. (SurgObesRelatDis 2015;11:268-269.) r 2015 American Society for Metabolic and

  20. Retrievable Guenther Tulip Vena Cava Filter in the prevention of pulmonary embolism in patients with acute deep venous thrombosis in perinatal period

    International Nuclear Information System (INIS)

    Objectives: To evaluate the feasibility and efficacy of the retrievable Guenther Tulip Vena Cava Filter in the prevention of pulmonary embolism in patients with acute deep vein thrombosis in the perinatal period and to discuss the technical demands associated with the filter's implantation and retrieval. Methods: Between 1996 until 2007, eight women (mean age 27.4 years, range 20-42 years) with acute deep iliofemoral venous thrombosis in the perinatal period of pregnancy and increased risk of pulmonary embolism during delivery were indicated for retrievable Guenther Tulip Vena Cava Filter implantation. All filters were inserted and removed under local anesthesia from the jugular approach. Results: The Guenther Tulip Vena Cava Filter was implanted suprarenally in all patients on the day of caesarean delivery. In follow-up cavograms performed just before planned filter removal, no embolus was seen in the filter in any patient. In all patients the filter was retrieved without complications on the 12th day after implantation. Conclusions: Retrievable Guenther Tulip Vena Cava Filters can be inserted and removed in patients during the perinatal period without major complications.

  1. Retrievable Guenther Tulip Vena Cava Filter in the prevention of pulmonary embolism in patients with acute deep venous thrombosis in perinatal period

    Energy Technology Data Exchange (ETDEWEB)

    Koecher, Martin [Department of Radiology, University Hospital, I.P. Pavlova 6, 775 20 Olomouc (Czech Republic)], E-mail: martin.kocher@seznam.cz; Krcova, Vera [Department of Hematooncology, University Hospital, I.P. Pavlova 6, 775 20 Olomouc (Czech Republic); Cerna, Marie [Department of Radiology, University Hospital, I.P. Pavlova 6, 775 20 Olomouc (Czech Republic); Prochazka, Martin [Department of Obstetrics and Gynaecology, University Hospital, I.P. Pavlova 6, 775 20 Olomouc (Czech Republic)

    2009-04-15

    Objectives: To evaluate the feasibility and efficacy of the retrievable Guenther Tulip Vena Cava Filter in the prevention of pulmonary embolism in patients with acute deep vein thrombosis in the perinatal period and to discuss the technical demands associated with the filter's implantation and retrieval. Methods: Between 1996 until 2007, eight women (mean age 27.4 years, range 20-42 years) with acute deep iliofemoral venous thrombosis in the perinatal period of pregnancy and increased risk of pulmonary embolism during delivery were indicated for retrievable Guenther Tulip Vena Cava Filter implantation. All filters were inserted and removed under local anesthesia from the jugular approach. Results: The Guenther Tulip Vena Cava Filter was implanted suprarenally in all patients on the day of caesarean delivery. In follow-up cavograms performed just before planned filter removal, no embolus was seen in the filter in any patient. In all patients the filter was retrieved without complications on the 12th day after implantation. Conclusions: Retrievable Guenther Tulip Vena Cava Filters can be inserted and removed in patients during the perinatal period without major complications.

  2. Análise de sensibilidade na otimização econômica de uma cava

    Directory of Open Access Journals (Sweden)

    Belisario Ascarza Flores

    2008-12-01

    Full Text Available Uma das variáveis que torna um projeto de mineração mais vulnerável à instabilidade econômica é a variação dos preços de venda dos minérios. Nesse trabalho, procedeu-se a uma análise de sensibilidade de cavas ótimas em relação à variação do preço de venda de um bem mineral. Foi gerada uma série de contornos de cavas ótimas com diferente valor presente líquido (VPL e diferentes quantidades de minério e estéril, a partir da aplicação de fatores de desconto sobre um preço de venda de minério tomado como base. Análises desse tipo são úteis para o estabelecimento do planejamento de produção de uma mina. Para esse estudo, foram utilizados dados da mina Morro da Mina da Rio Doce Manganês S.A. e, para a geração das cavas otimizadas, utilizou-se o módulo Pit Optimiser do Gemcom Surpac 6.0.One of the variables that makes the economic stability of a mining project more vulnerable is the variation of ore sale prices. In this work, a sensitivity analysis of optimum pits in relation to the variation of the sale price of ore was performed. It generated a set of optimal pits shells with different net present values (NPV and different amounts of ore and waste, and the application of discount factors of the ore's sale price was taken as the base. Analyses of this type are useful for the establishment of production planning of a mine. For this study, data obtained from the manganese mine of Morro da Mina of Rio Doce Manganês S.A. was used, and the modulate Pit Optimiser of the Gemcom Surpac 6.0 was applied to generate the optimum pits.

  3. Hypoxemia and Right-to-Left-Shunt in Patient with Antiphospholipid Syndrome: A Case Report with Multimodality Imaging Findings and Literature Review

    Science.gov (United States)

    Bin Saeedan, Mnahi; Alrujaib, Mashael; Fathala, Ahmed L.

    2016-01-01

    This is a case report of an extremely rare cause of superior vena cava syndrome with systemic-to-pulmonary venous shunts, illustrated using different imaging modalities with successful SVC and IVC dilatation and stenting. PMID:27034877

  4. 综合利用SVC和风力发电机的风电场无功控制策略%A strategy of reactive power control for wind farm operation using SVC and DFIG

    Institute of Scientific and Technical Information of China (English)

    赵利刚; 房大中; 孔祥玉; 侯佑华

    2012-01-01

    A reactive power control strategy is proposed for reactive power balance and voltage stability of wind farms. The control objective is to maintain reactive power exchange between wind farm and the grid at a specific value. To achieve the control target, both SVC installed in wind farm and the reactive power adjustment ability of Doubly Fed Induction Generator (DFIG) are used. In addition, a method is proposed to determine the adjusting order of DFIGs according to the sensitivity of the reactive power output of wind turbines in different locations to the output reactive power of export bus, in which the total output reactive power of DFIGs could be less. Finally, the effectiveness of the control strategy is verified by using the operation data of a wind farm in Inner Mongolia.%针对风电场的无功功率平衡和电压稳定问题,提出了一种以风电场与电网交换无功功率值为目标的控制策略.综合运用风电场安装的SVC无功补偿装置及双馈机组的无功调节能力来达到这一目标值.提出了依据不同位置的风机发出无功功率对出口母线送出无功的灵敏度来确定风机调整顺序的方法,使风机发出尽量少的无功功率来满足出口处送出无功的要求.用内蒙某实际风电场运行数据验证了控制策略的有效性.

  5. Cosmic Tidal Reconstruction

    CERN Document Server

    Zhu, Hong-Ming; Yu, Yu; Er, Xinzhong; Chen, Xuelei

    2015-01-01

    The gravitational coupling of a long wavelength tidal field with small scale density fluctuations leads to anisotropic distortions of the locally measured small scale matter correlation function. Since the local correlation function is statistically isotropic in the absence of such tidal interactions, the tidal distortions can be used to reconstruct the long wavelength tidal field and large scale density field in analogy with the cosmic microwave background lensing reconstruction. In this paper we present in detail a formalism for the cosmic tidal reconstruction and test the reconstruction in numerical simulations. We find that the density field on large scales can be reconstructed with good accuracy and the cross correlation coefficient between the reconstructed density field and the original density field is greater than 0.9 on large scales ($k\\lesssim0.1h/\\mathrm{Mpc}$). This is useful in the 21cm intensity mapping survey, where the long wavelength radial modes are lost due to foreground subtraction proces...

  6. Re-construction

    OpenAIRE

    Bernadette Marie Devilat

    2013-01-01

    Re-construct: to build again. The necessary reconstruction process after an earthquake can be seen as an opportunity to improve previous conditions. All damaged buildings undergo a renovation process in which every piece is carefully returned to its original place. The photograph shows roof reconstruction work in San Pedro de Alcántara, a heritage area in the central valley of Chile, which was particularly affected by the 2010 earthquake. 

  7. Flexor pulley reconstruction.

    Science.gov (United States)

    Dy, Christopher J; Daluiski, Aaron

    2013-05-01

    Flexor pulley reconstruction is a challenging surgery. Injuries often occur after traumatic lacerations or forceful extension applied to an acutely flexed finger. Surgical treatment is reserved for patients with multiple closed pulley ruptures, persistent pain, or dysfunction after attempted nonoperative management of a single pulley rupture, or during concurrent or staged flexor tendon repair or reconstruction. If the pulley cannot be repaired primarily, pulley reconstruction can be performed using graft woven into remnant pulley rim or looping graft around the phalanx. Regardless of the reconstructive technique, the surgeon should emulate the length, tension, and glide of the native pulley. PMID:23660059

  8. Image Reconstruction. Chapter 13

    International Nuclear Information System (INIS)

    This chapter discusses how 2‑D or 3‑D images of tracer distribution can be reconstructed from a series of so-called projection images acquired with a gamma camera or a positron emission tomography (PET) system [13.1]. This is often called an ‘inverse problem’. The reconstruction is the inverse of the acquisition. The reconstruction is called an inverse problem because making software to compute the true tracer distribution from the acquired data turns out to be more difficult than the ‘forward’ direction, i.e. making software to simulate the acquisition. There are basically two approaches to image reconstruction: analytical reconstruction and iterative reconstruction. The analytical approach is based on mathematical inversion, yielding efficient, non-iterative reconstruction algorithms. In the iterative approach, the reconstruction problem is reduced to computing a finite number of image values from a finite number of measurements. That simplification enables the use of iterative instead of mathematical inversion. Iterative inversion tends to require more computer power, but it can cope with more complex (and hopefully more accurate) models of the acquisition process

  9. Bitzer's Model Reconstructed.

    Science.gov (United States)

    Lybarger, Scott; Smith, Craig R.

    1996-01-01

    Reconstructs Lloyd Bitzer's situational model to serve as a guide for the generation of multiperspectival critical assessments of rhetorical discourse. Uses two of President Bush's speeches on the drug crisis to illustrate how the reconstructed model can account for such modern problems as multiple audiences, perceptions, and exigencies. (PA)

  10. The CMS Reconstruction Software

    Science.gov (United States)

    Lange, David J.; CMS Collaboration

    2011-12-01

    We report on the status and plans for the event reconstruction software of the CMS experiment. The CMS reconstruction algorithms are the basis for a wide range of data analysis approaches currently under study by the CMS collaboration using the first high-energy run of the LHC. These algorithms have been primarily developed and validated using simulated data samples, and are now being commissioned with LHC proton-proton collision data samples. The CMS reconstruction is now operated routinely on all events triggered by the CMS detector, both in a close to real-time prompt reconstruction processing and in frequent passes over the full recorded CMS data set. We discuss the overall software design, development cycle, computational requirements and performance, recent operational performance, and planned improvements of the CMS reconstruction software.

  11. Evaluation of antioxidant properties of a new compound, pyrogallol-phloroglucinol-6,6'-bieckol isolated from brown algae, Ecklonia cava

    OpenAIRE

    Kang, Sung-Myung; Lee, Seung-Hong; Heo, Soo-Jin; Kim, Kil-Nam; Jeon, You-Jin

    2011-01-01

    In this study, antioxidant and free radical scavenging activities of the natural antioxidative compound, pyrogallol-phloroglucinol-6,6'-bieckol (PPB) isolated from brown algae, Ecklonia cava was assessed in vitro by measuring the radical scavenging activities (DPPH, alkyl, hydroxyl, and superoxide) using electron spin resonance (ESR) spectrometry, intracellular reactive oxygen species (ROS) scavenging activity, and DNA damage assay. According to the results of these experiments, the scavengin...

  12. Simultaneous removal of a tumour of the right atrium and inferior vena cava and coronary bypass-grafting in a patient with recurrent clear renal cell carcinoma

    Science.gov (United States)

    Pietrzyk, Edward; Głuszek, Stanisław; Michta, Kamil; Kot, Marta; Wożakowska-Kapłon, Beata

    2015-01-01

    Metastatic cardiac tumours are the most common malignant cardiac tumours. In the early stages they are usually asymptomatic, but their consequences can be very serious, and the prognosis is poor. We present a patient with recurrent renal cell carcinoma as a tumour of the right atrium and the vena cava inferior in whom cancerous masses were removed with simultaneously coronary artery bypass-grafting. PMID:26855653

  13. Advanced Stage T-Cell Non-Hodgkin lymphoma in an 11-Month-Old Infant and Related Superior Vena Cava Syndrome: Importance of Transthoracic Echocardiography.

    Science.gov (United States)

    Yilmaz, Osman; Karabag, Kezban; Keskin Yildirim, Zuhal; Calik, Muhammet; Kilic, Omer

    2014-01-01

    Superior vena cava syndrome (SVCS) is rare in infants. Non-Hodgkin lymphoma is the most common cause of SVCS in children. Swelling in the face and neck are the most common clinical symptoms associated with this syndrome. However, these clinical findings are also observed in allergic diseases, which therefore often leads to misdiagnosis. Here, we reported the importance of echocardiography in diagnosing SVCS in an infant with advanced stage non-Hodgkin lymphoma. PMID:24639614

  14. Measurement of Anterior-Posterior Diameter of Inferior Vena Cava by Ultrasonography: A Non-Invasive Method for Estimation of Central Venous Pressure

    OpenAIRE

    R Nafisi-Moghadam; Mansourian, H.R

    2007-01-01

    Background and Objective: The assessment of blood volume is now one of the most commonly needed interventions in the first line of care and severe ill patients. Measuring central venous pressure (CVP) is an invasive method, most frequently used in clinical practice for the assessment of volume status. The di-ameter of the inferior vena cava (IVC) is a parameter to estimate central venous pressure. The purpose of this study was to determine whether measurement of the anterior-posterior diamete...

  15. Treatment of pulmonary embolism and prevention of recurrence by placement of vena cava filters in prevention of deep venous thrombosis: Case report

    Directory of Open Access Journals (Sweden)

    Vučićević-Trobok Jadranka

    2002-01-01

    Full Text Available Introduction In patients with pulmonary thromboembolism it is clinical to suspect the disease, establish the diagnosis and initiate anticoagulation treatment as early as possible in order to prevent relapses, which may be fatal. Deep venous thrombosis of lower extremities is the most common site of origin, which initially may remain obscure. Case report Two weeks prior to admission the patient had right-sided chest pain accompanied with dyspnea, interpreted and treated as pleuropneumonia. Pulmonary thromboembolism was suspected due to clinical symptoms, chest X-ray, elevated enzyme levels findings, blood gas analysis with hypoxemia and ECG with right heart overload. The diagnosis of pulmonary thromboembolism confirmed by lung scintigraphy presented with perfusion defects. After twenty days of heparin therapy, the patient developed left leg edema. Ultrasound screening confirmed bilateral iliac-femoral popliteal vein thrombosis of iliacofemoropopliteal veins bilaterally. Phlebography performed via jugular vein disclosed thrombotic material in the right common iliac vein, as well as in the vena cava inferior. In the course of the procedure vena cava filter has been placed. Discussion Although the patient was receiving anticoagulation heparin therapy, he developed pulmonary thromboembolism relapse and deep venous thrombosis. In our patient, vena cava filter placement was aimed at preventing pulmonary thromboembolism relapse. Since a deficit of S protein was also established, the patient is unfortunately likely to develop thrombosis at other sites as well. Conclusion In our patient pulmonary thromboembolism was a consequence of deep venous thrombosis, and the diagnosis was established by ultrasound screening of the lower extremities and confirmed by phlebography. During phlebography vena cava filter was placed in order to prevent pulmonary thromboembolism.

  16. Absence of inferior vena cava in 14-year old boy associated with deep venous thrombosis and positive Mycoplasma pneumoniae serum antibodies- a case report

    OpenAIRE

    Kalicki, Boleslaw; Sadecka, Monika; Wawrzyniak, Agata; Kozinski, Piotr; Dziekiewicz, Miroslaw; Jung, Anna

    2015-01-01

    Background Absence of the inferior vena cava is a rare vascular anomaly, which usually remains asymptomatic in childhood. It is recognized as the risk factor for deep venous thrombosis, since the collateral circulation does not provide adequate drainage of the lower limbs. Mycoplasma pneumoniae is a common cause of community-acquired pneumonia in school-aged children and adolescents. Mycoplasma pneumoniae infection might be associated with deep venous thrombosis but its pathophysiology remain...

  17. Advanced Stage T-Cell Non-Hodgkin lymphoma in an 11-Month-Old Infant and Related Superior Vena Cava Syndrome: Importance of Transthoracic Echocardiography

    OpenAIRE

    YILMAZ, Osman; KARABAG, Kezban; KESKIN YILDIRIM, Zuhal; CALIK, Muhammet; KILIC, Omer

    2014-01-01

    Superior vena cava syndrome (SVCS) is rare in infants. Non-Hodgkin lymphoma is the most common cause of SVCS in children. Swelling in the face and neck are the most common clinical symptoms associated with this syndrome. However, these clinical findings are also observed in allergic diseases, which therefore often leads to misdiagnosis. Here, we reported the importance of echocardiography in diagnosing SVCS in an infant with advanced stage non-Hodgkin lymphoma.

  18. A prebiotic role of Ecklonia cava improves the mortality of Edwardsiella tarda-infected zebrafish models via regulating the growth of lactic acid bacteria and pathogen bacteria.

    Science.gov (United States)

    Lee, WonWoo; Oh, Jae Young; Kim, Eun-A; Kang, Nalae; Kim, Kil-Nam; Ahn, Ginnae; Jeon, You-Jin

    2016-07-01

    In this study, the beneficial prebiotic roles of Ecklonia cava (E. cava, EC) were evaluated on the growth of lactic acid bacteria (LAB) and pathogen bacteria and the mortality of pathogen-bacteria infected zebrafish model. The result showed that the original E. cava (EC) led to the highest growth effects on three LABs (Lactobacillus brevis, L. brevis; Lactobacillus pentosus, L. pentosus; Lactobacillus plantarum; L. plantarum) and it was dose-dependent manners. Also, EC, its Celluclast enzymatic (ECC) and 100% ethanol extracts (ECE) showed the anti-bacterial activities on the fish pathogenic bacteria such as (Edwardsiella tarda; E. tarda, Streptococcus iniae; S. iniae, and Vibrio harveyi; V. harveyi). Interestingly, EC induced the higher production of the secondary metabolites from L. plantarum in MRS medium. The secondary metabolites produced by EC significantly inhibited the growth of pathogen bacteria. In further in vivo study, the co-treatment of EC and L. plantarum improved the growth and mortality of E. tarda-infected zebrafish as regulating the expression of inflammatory molecules such as iNOS and COX2. Taken together, our present study suggests that the EC plays an important role as a potential prebiotic and has a protective effect against the infection caused by E. tarda injection in zebrafish. Also, our conclusion from this evidence is that EC can be used and applied as a useful prebiotic. PMID:27192145

  19. Delayed breast implant reconstruction

    DEFF Research Database (Denmark)

    Hvilsom, Gitte B.; Hölmich, Lisbet R.; Steding-Jessen, Marianne;

    2011-01-01

    -stage procedures. From the Danish Registry for Plastic Surgery of the Breast, which has prospectively registered data for women undergoing breast implantations since 1999, we identified 559 women without a history of radiation therapy undergoing 592 delayed breast reconstructions following breast cancer during the......Studies of complications following reconstructive surgery with implants among women with breast cancer are needed. As the, to our knowledge, first prospective long-term study we evaluated the occurrence of complications following delayed breast reconstruction separately for one- and two...

  20. Iodine-125 Seeds Strand for Treatment of Tumor Thrombus in Inferior Vena Cava: An Experimental Study in a Rabbit Model

    International Nuclear Information System (INIS)

    Objective: The purpose of this study was to establish an animal model of implanted inferior vena cava tumor thrombus (IVCTT) and to evaluate the effect of linear iodine-125 seeds strand in treating implanted IVCTT. Methods: Tumor cell line VX2 was inoculated subcutaneously into New Zealand rabbit to develop the parent tumor. The tumor strip was inoculated into inferior vena cava (IVC) to establish the IVCTT model. The IVCTT was confirmed by multidetector computed tomography (MDCT) after 2 weeks. Twelve rabbits with IVCTT were randomly divided into two groups. Treatment group (group T; n = 6) underwent Iodine-125 seeds brachytherapy, and the control group (group C; n = 6) underwent blank seeds strand. The blood laboratory examination (including blood routine examination, hepatic and renal function), body weight, survival time, and IVCTT volume by MDCT were monitored. All rabbits were dissected postmortem, and the therapeutic effects were evaluated on the basis of histopathology. The proliferating cell nuclear antigen index (PI) and apoptosis index (AI) of IVCTT were compared between two groups. T test, Wilcoxon rank test, and Kaplan–Meier survival curve analysis were used. Results: The success rate of establishing IVCTT was 100 %. The body weight loss and cachexia of rabbits in group C appeared earlier than in group T. Body weight in the third week, the mean survival time, PI, AI in groups T and C were 2.23 ± 0.12 kg, 57.83 ± 8.68 days, (16.73 ± 5.18 %), (29.47 ± 7.18 %), and 2.03 ± 0.13 kg, 43.67 ± 5.28 days, (63.01 ± 2.01 %), (6.02 ± 2.93 %), respectively. There were statistically significant differences between group T and group C (P < 0.05). The IVCTT volume of group T was remarkably smaller than that of group C. Conclusions: Injecting and suspensory fixing VX2 tumor strip into IVC is a reliable method to establish IVCTT animal model. The linear Iodine-125 seeds strand brachytherapy was a safe and effective method for treating IVCTT in rabbit model

  1. Iodine-125 Seeds Strand for Treatment of Tumor Thrombus in Inferior Vena Cava: An Experimental Study in a Rabbit Model

    Energy Technology Data Exchange (ETDEWEB)

    Zhang, Wen, E-mail: wenzhangxiao@126.com; Yan, Zhiping, E-mail: Yan.zhiping@zs-hospital.sh.cn; Luo, Jianjun, E-mail: luo.jianjun@zs-hospital.sh.cn; Fang, Zhuting, E-mail: 470389481@qq.com; Wu, Linlin, E-mail: linlinzhifubao@126.com; Liu, QingXin, E-mail: liu.qingxin@zs-hospital.sh.cn; Qu, Xudong, E-mail: qu.xudong@zs-hospital.sh.cn; Liu, Lingxiao, E-mail: liu.lingxiao@zs-hospital.sh.cn; Wang, Jianhua, E-mail: wang.jianhua@zs-hospital.sh.cn [Fudan University, Department of Interventional Radiology, Zhongshan Hospital (China)

    2013-10-15

    Objective: The purpose of this study was to establish an animal model of implanted inferior vena cava tumor thrombus (IVCTT) and to evaluate the effect of linear iodine-125 seeds strand in treating implanted IVCTT. Methods: Tumor cell line VX{sub 2} was inoculated subcutaneously into New Zealand rabbit to develop the parent tumor. The tumor strip was inoculated into inferior vena cava (IVC) to establish the IVCTT model. The IVCTT was confirmed by multidetector computed tomography (MDCT) after 2 weeks. Twelve rabbits with IVCTT were randomly divided into two groups. Treatment group (group T; n = 6) underwent Iodine-125 seeds brachytherapy, and the control group (group C; n = 6) underwent blank seeds strand. The blood laboratory examination (including blood routine examination, hepatic and renal function), body weight, survival time, and IVCTT volume by MDCT were monitored. All rabbits were dissected postmortem, and the therapeutic effects were evaluated on the basis of histopathology. The proliferating cell nuclear antigen index (PI) and apoptosis index (AI) of IVCTT were compared between two groups. T test, Wilcoxon rank test, and Kaplan-Meier survival curve analysis were used. Results: The success rate of establishing IVCTT was 100 %. The body weight loss and cachexia of rabbits in group C appeared earlier than in group T. Body weight in the third week, the mean survival time, PI, AI in groups T and C were 2.23 {+-} 0.12 kg, 57.83 {+-} 8.68 days, (16.73 {+-} 5.18 %), (29.47 {+-} 7.18 %), and 2.03 {+-} 0.13 kg, 43.67 {+-} 5.28 days, (63.01 {+-} 2.01 %), (6.02 {+-} 2.93 %), respectively. There were statistically significant differences between group T and group C (P < 0.05). The IVCTT volume of group T was remarkably smaller than that of group C. Conclusions: Injecting and suspensory fixing VX2 tumor strip into IVC is a reliable method to establish IVCTT animal model. The linear Iodine-125 seeds strand brachytherapy was a safe and effective method for treating IVCTT

  2. Reproduction of a new inferior vena cava thrombosis model and study of the evolutionary process of thrombolysis in rats

    Directory of Open Access Journals (Sweden)

    Jian FU

    2015-10-01

    Full Text Available Objective To investigate the reproduction of a new model of thrombosis of inferior vena cava (IVC, and explore the natural process of thrombolysis and its mechanism in rats. Methods Forty-eight SD rats were randomly classified into experimental group and control group. In the experimental group, the lumen of the vena cava was blocked by about 80%-90% with a ligature of IVC below the left renal vein, and then the animals were redivided into three subgroups (n=12, each. In group A, the IVC endothelium was damaged and its tributaries were ligated. In group B, the IVC endothelium was damaged and its tributaries were not ligated. In group C, no damage was done to the endothelium of the IVC but all its tributaries were ligated. A sham-operated group served as control. The length and weight of the vinous thrombus and the percentage of the IVC luminal area were compared after operation to determine the optimum animal model of venous thrombosis. According to the best mode to establish the model, the thrombus specimens were collected and detected by HE and Masson staining, and the ED-1 expressions were examined by immunohistochemical staining after thrombus formation in 30 rats. The natural evolution of intravenous thrombolysis was analyzed dynamically and the cell types involved in this process were observed. Results Gross observation showed that the experimental group was successfully induced thrombus formation. The thrombus length and weight in group A was significantly higher than that in group B and group C, and no difference between group B and C. The thrombus area in group A was significantly higher than that in groups B and group C, which identified the group A was the optimal model group of venous thrombosis. In the group reproduced by the best mode of the model, HE and Masson staining results showed that new capillaries and the components of collagen and extracellular matrix increased gradually with the passage of time in the process of

  3. Surgical Ventricular Reconstruction

    Medline Plus

    Full Text Available SURGICAL VENTRICULAR RECONSTRUCTION MONTEFIORE-EINSTEIN HEART CENTER NEW YORK CITY, NEW YORK February 13, 2008 00:00:09 NARRATOR: Welcome to the Montefiore-Einstein Heart Center in ...

  4. Surgical Ventricular Reconstruction

    Medline Plus

    Full Text Available SURGICAL VENTRICULAR RECONSTRUCTION MONTEFIORE-EINSTEIN HEART CENTER NEW YORK CITY, NEW YORK February 13, 2008 00:00:09 NARRATOR: Welcome to the Montefiore-Einstein Heart Center in New York City. In ...

  5. Prairie Reconstruction Initiative

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — The purpose of the Prairie Reconstruction Initiative Advisory Team (PRIAT) is to identify and take steps to resolve uncertainties in the process of prairie...

  6. Overview of Image Reconstruction

    Energy Technology Data Exchange (ETDEWEB)

    Marr, R. B.

    1980-04-01

    Image reconstruction (or computerized tomography, etc.) is any process whereby a function, f, on Rn is estimated from empirical data pertaining to its integrals, ∫f(x) dx, for some collection of hyperplanes of dimension k < n. The paper begins with background information on how image reconstruction problems have arisen in practice, and describes some of the application areas of past or current interest; these include radioastronomy, optics, radiology and nuclear medicine, electron microscopy, acoustical imaging, geophysical tomography, nondestructive testing, and NMR zeugmatography. Then the various reconstruction algorithms are discussed in five classes: summation, or simple back-projection; convolution, or filtered back-projection; Fourier and other functional transforms; orthogonal function series expansion; and iterative methods. Certain more technical mathematical aspects of image reconstruction are considered from the standpoint of uniqueness, consistency, and stability of solution. The paper concludes by presenting certain open problems. 73 references. (RWR)

  7. Surgical Ventricular Reconstruction

    Medline Plus

    Full Text Available ... reconstruction. This study is going to be a land…landmark study. And in all likelihood will influence ... improve postoperatively. But, nevertheless, this is an acute change and may take some time for the myocardium ...

  8. Overview of image reconstruction

    International Nuclear Information System (INIS)

    Image reconstruction (or computerized tomography, etc.) is any process whereby a function, f, on R/sup n/ is estimated from empirical data pertaining to its integrals, ∫f(x) dx, for some collection of hyperplanes of dimension k < n. The paper begins with background information on how image reconstruction problems have arisen in practice, and describes some of the application areas of past or current interest; these include radioastronomy, optics, radiology and nuclear medicine, electron microscopy, acoustical imaging, geophysical tomography, nondestructive testing, and NMR zeugmatography. Then the various reconstruction algorithms are discussed in five classes: summation, or simple back-projection; convolution, or filtered back-projection; Fourier and other functional transforms; orthogonal function series expansion; and iterative methods. Certain more technical mathematical aspects of image reconstruction are considered from the standpoint of uniqueness, consistency, and stability of solution. The paper concludes by presenting certain open problems. 73 references

  9. Breast reconstruction - natural tissue

    Science.gov (United States)

    After a mastectomy , some women choose to have cosmetic surgery to remake their breast. This type of surgery ... Risks of anesthesia and surgery are: Reactions to medicines Breathing problems Bleeding, blood clots , or infection Risks of breast reconstruction with ...

  10. Permutationally invariant state reconstruction

    CERN Document Server

    Moroder, Tobias; Toth, Geza; Schwemmer, Christian; Niggebaum, Alexander; Gaile, Stefanie; Gühne, Otfried; Weinfurter, Harald

    2012-01-01

    Feasible tomography schemes for large particle numbers must possess, besides an appropriate data acquisition protocol, also an efficient way to reconstruct the density operator from the observed finite data set. Since state reconstruction typically requires the solution of a non-linear large-scale optimization problem, this is a major challenge in the design of scalable tomography schemes. Here we present an efficient state reconstruction scheme for permutationally invariant quantum state tomography. It works for all common state-of-the-art reconstruction principles, including, in particular, maximum likelihood and least squares methods, which are the preferred choices in today's experiments. This high efficiency is achieved by greatly reducing the dimensionality of the problem employing a particular representation of permutationally invariant states known from spin coupling combined with convex optimization, which has clear advantages regarding speed, control and accuracy in comparison to commonly employed n...

  11. Surgical Ventricular Reconstruction

    Medline Plus

    Full Text Available ... a better procedure, the ventricular reconstruction or heart transplantation. This particular viewer actually saw our previous video on heart transplantation. And to answer that question, they are both ...

  12. On TPC cluster reconstruction

    CERN Document Server

    Dydak, F; Nefedov, Y; Wotschack, J; Zhemchugov, A

    2004-01-01

    For a bias-free momentum measurement of TPC tracks, the correct determination of cluster positions is mandatory. We argue in particular that (i) the reconstruction of the entire longitudinal signal shape in view of longitudinal diffusion, electronic pulse shaping, and track inclination is important both for the polar angle reconstruction and for optimum r phi resolution; and that (ii) self-crosstalk of pad signals calls for special measures for the reconstruction of the z coordinate. The problem of 'shadow clusters' is resolved. Algorithms are presented for accepting clusters as 'good' clusters, and for the reconstruction of the r phi and z cluster coordinates, including provisions for 'bad' pads and pads next to sector boundaries, respectively.

  13. Surgical Ventricular Reconstruction

    Medline Plus

    Full Text Available ... He has not been readmitted for any reasons related to heart failure. 00:41:57 ROBERT E. ... question, because it really deals with whether anything related to surgical ventricular reconstruction would add to the ...

  14. Chalet. Reconstruction from Memory

    OpenAIRE

    Gheysen, Eva

    2015-01-01

    In the research project several design tactics are developed in order to counteract the phenomenon of experiential erosion. This particular project explored one of the tactics: Reconstruction from Memory. When reconstructing space from memory, isolated spatial fragments from the past are reformed into a new, decontextualized construct that represents the most memorable experiences evoked by that space. These memories give insight in which architectural features strongly affect our experience ...

  15. Reconstructing baryon oscillations

    OpenAIRE

    Noh, Yookyung; White, Martin; Padmanabhan, Nikhil

    2009-01-01

    The baryon acoustic oscillation (BAO) method for constraining the expansion history is adversely affected by non-linear structure formation, which washes out the correlation function peak created at decoupling. To increase the constraining power of low z BAO experiments, it has been proposed that one use the observed distribution of galaxies to "reconstruct'' the acoustic peak. Recently Padmanabhan, White and Cohn provided an analytic formalism for understanding how reconstruction works withi...

  16. Cosmic tidal reconstruction

    Science.gov (United States)

    Zhu, Hong-Ming; Pen, Ue-Li; Yu, Yu; Er, Xinzhong; Chen, Xuelei

    2016-05-01

    The gravitational coupling of a long-wavelength tidal field with small-scale density fluctuations leads to anisotropic distortions of the locally measured small-scale matter correlation function. Since the local correlation function is known to be statistically isotropic in the absence of such tidal interactions, the tidal distortions can be used to reconstruct the long-wavelength tidal field and large-scale density field in analogy with the cosmic microwave background lensing reconstruction. In this paper we present the theoretical framework of cosmic tidal reconstruction and test the reconstruction in numerical simulations. We find that the density field on large scales can be reconstructed with good accuracy and the cross-correlation coefficient between the reconstructed density field and the original density field is greater than 0.9 on large scales (k ≲0.1 h /Mpc ), with the filter scale ˜1.25 Mpc /h . This is useful in the 21 cm intensity mapping survey, where the long-wavelength radial modes are lost due to a foreground subtraction process.

  17. Permutationally invariant state reconstruction

    DEFF Research Database (Denmark)

    Moroder, Tobias; Hyllus, Philipp; Tóth, Géza;

    2012-01-01

    Feasible tomography schemes for large particle numbers must possess, besides an appropriate data acquisition protocol, an efficient way to reconstruct the density operator from the observed finite data set. Since state reconstruction typically requires the solution of a nonlinear large-scale opti......Feasible tomography schemes for large particle numbers must possess, besides an appropriate data acquisition protocol, an efficient way to reconstruct the density operator from the observed finite data set. Since state reconstruction typically requires the solution of a nonlinear large......-scale optimization problem, this is a major challenge in the design of scalable tomography schemes. Here we present an efficient state reconstruction scheme for permutationally invariant quantum state tomography. It works for all common state-of-the-art reconstruction principles, including, in particular, maximum...... likelihood and least squares methods, which are the preferred choices in today's experiments. This high efficiency is achieved by greatly reducing the dimensionality of the problem employing a particular representation of permutationally invariant states known from spin coupling combined with convex...

  18. A ZERO SHIFTED SPIHT BASED SVC

    Directory of Open Access Journals (Sweden)

    Bibhuprasad Mohanty,

    2010-11-01

    Full Text Available In this work, we proposed a modified version of 3D SPIHT based video codec. The codec employs the SPIHT coding algorithm using 3-D spatio-temporal orientation trees in video coding, analogous to the 2-Dspatial orientation trees in image coding. We have improved the coding efficiency of the 3D SPIHT based codec by adding a preprocessing step that we call zero-shifting. The video codec is fully embedded, so that different degrees of video quality can be obtained with a single compressed bit stream. The codec has been tested using both high motion and low motion standard QCIF video sequences at 10 frames per second. The cost for this embeddedness is the coding delay (latency to accept 16 frames into a buffer. At low bitrates the proposed scheme outperforms the existing scheme and achieves a gain of 1.5 to 5dB in PSNR, depending on the type of video. We have implemented a Scalable Video Codec that produces a bitstream which supports spatial scalability. This layered based codec is proposed by partitioning the spatial domain frame into four groups and encoding them separately with 3D SPIHT kernel to produce the bit stream. This bitstream not only has spatial scalability features but also keeps the full SNR embeddedness property for only lowest resolution level. In fact, our scalable video codec can be realized for a parallel architecture which in turn will be suitable for efficient hardware realization.

  19. Radiographic evaluation of caudal vena cava size as a useful parameter for the diagnosis of heart disease in dairy cattle

    International Nuclear Information System (INIS)

    To quantify the radiographic parameters of the caudal vena cava (CVC) in healthy cattle and demonstrate their clinical usefulness, the present study compared the ratios of the diameter of the thoracic CVC to the diameter of the aorta (Ao) and length of the thoracic vertebrae (VL), which are all positioned in the same intercostal space, in 81 healthy control cattle (43 growing, 38 adult) and 10 cattle with heart disease. The average diameter of the CVC (CVCave) was correlated with the size of the Ao and VL in the control cows. Although the diameter and pulsation index of the CVC differed significantly between the growing and adult cows, the ratios of CVC/Ao and CVC/VL were fixed values for both the growing and mature cattle. However, in the cattle with heart disease, the pulsation index of the CVC was significantly lower or there was absence of pulsation due to a dilated CVC, and the ratio of CVCave/Ao and CVCave/VL were significantly higher than those in the healthy cattle

  20. Are inferior vena cava filters effective for prophylaxis of critical pulmonary embolism in patients with cancer and coexisting venous thromboembolism?

    International Nuclear Information System (INIS)

    Cancer sometimes causes venous thromboembolisms (VTE) including pulmonary embolisms (PE), which impedes aggressive treatment such as chemotherapy. From January 2003 to March 2007, there were 120 hospitalized patients with existing VTE in The University of Tokyo Hospital. Among them we reviewed 39 patients with cancer who required aggressive chemoradiotherapy and examined whether inferior vena cava (IVC) filtration was necessary in addition to ordinary anticoagulant therapy. The clinical stage of cancer was stage I in 7, stage II in 4, stage III in 11, and stage IV in 17. Most were advanced cancer. Of the 39, 9 underwent an IVC filter placement (filter group) and 30 did not (no-filter group). All of them received regular anticoagulant therapy. In the long-term follow up averaging 16.9 months, one patient of the filter group required discontinuation of chemotherapy due to symptomatic PE, but there was no such a case in the no-filter group. Filter-related complications such as IVC occlusion or migration did not occur. Computed tomography showed VTE in the long-term course in 27 out of 39 patients, and suggested increased thrombi in cases of recurrent cancer and those with poor outcome. Seventeen died of cancer but no one died of PE during the study. This study showed that IVC filters offered no beneficial effect for the patients with existing VTE who receive aggressive chemotherapy. (author)

  1. In Vivo Evaluation of a Retrievable Vena Cava Filter-The Dibie-Musset Filter: Experimental Results

    International Nuclear Information System (INIS)

    Purpose: To evaluate, in an animal model, the efficacy and safety of a 7 Fr percutaneous vena cava filter for temporary or permanent use. Methods: The Dibie-Musset (DM) filter is a wire preformed into a double-spiral shape with a spring effect. The experiment was performed in 15 adult sheep and consisted of the insertion of 45 filters, clot trapping tests, and filter retrieval. Follow-up in all sheep consisted of radiologic (abdominal radiograph, inferior vena cavogram, abdominal computed tomography), macroscopic, and microscopic examinations between days 8 and 386 after filter placement. Results: Of the 45 filters implanted in 15 sheep, 29 were retrieved between day 0 and day 15. Filtration efficiency was 100% for clots 4 x 4 x 20 mm. No long-term (1 year) side-effects were detectable. Microscopic examination of the vein wall showed only a dense intimal fibrosis without signs of acute inflammation at 1 year. Conclusion: These results support the efficiency and safety of the DM filter in an animal model

  2. Failed Retrieval of an Inferior Vena Cava Filter During Pregnancy Because of Filter Tilt: Report of Two Cases

    International Nuclear Information System (INIS)

    Thromboembolic disease during pregnancy is an important cause of obstetric morbidity and mortality. Pregnant patients with venous thromboembolism are usually managed by conventional anticoagulation. However, this must be discontinued during vaginal or caesarian delivery to avoid haemorrhage and to reduce the risk of possible epidural haematoma. Retrievable inferior vena cava filters (IVCFs) offer protection against pulmonary embolism during this high-risk period, when anticoagulation is discontinued, while avoiding potential long-term sequelae of a permanent IVCF. Here we report two patients who presented in the third trimester of pregnancy with floating ileofemoral deep vein thrombosis. Both patients were initially treated with standard anticoagulation; however, shortly before delivery both patients had a retrievable IVCF placed in a suprarenal position. In both patients, retrieval failed at 28 days after insertion because of filter tilt. The timing and mechanism of filter tilt remains uncertain. We believe that a number of factors could have been involved, including change in the anatomic configuration with lateral displacement of the IVCF as a result of the gravid uterus as well as forceful uterine contractions during labour, which modified the shape and diameter of the IVC. We showed that failure to retrieve the IVCF has had considerable implications for the two young patients regarding long-term anticoagulation and have highlighted the need for further clinical trials regarding the safe use of retrievable IVCFs during pregnancy.

  3. The Incidental Finding of a Persistent Left Superior Vena Cava: Implications for Primary Care Providers—Case and Review

    Directory of Open Access Journals (Sweden)

    Loren Garrison Morgan

    2015-01-01

    Full Text Available Persistent left superior vena cava (PLSVC is the most common thoracic venous anomaly and is a persistent congenital remnant of the vena caval system from early cardiac development. Patients with congenital anomalous venous return are at increased risk of developing various cardiac arrhythmias, due to derangement of embryologic conductive tissue during the early development of the heart. Previously this discovery was commonly made during the placement of pacemakers or defibrillators for the treatment of the arrhythmias, when the operator encountered difficulty with proper lead deployment. However, in today’s world of various easily obtainable imaging modalities, PLSVC is being discovered more and more by primary care providers during routine testing or screening for other ailments. Given the known association between anomalous venous return and the propensity for cardiac arrhythmias, we review the embryology of PLSVC and the mechanisms by which it leads to conduction abnormalities. We also provide the practitioner with recommendations for certain baseline cardiac observations and suggestions for proper surveillance in hopes that better understanding will reduce unnecessary and potentially harmful testing, premature subspecialty referral, and unneeded patient anxiety.

  4. Percutaneous embolization of a giant collateral vessel originating from the azygos vein via the inferior vena cava.

    Science.gov (United States)

    Witzke, Christian; Bhatt, Ami; Inglessis, Ignacio

    2013-11-15

    We present the case of a 45-year-old man with univentricular heart, small outlet chamber, and L-transposition of the great vessels. As an infant, the patient underwent multiple palliative surgical interventions. He presented with worsening dyspnea and fatigue and was found to have systemic oxygen saturation of 85% on 2 L of oxygen by nasal cannula, whereas he had chronically remained between 90 and 95% throughout most of adulthood. There was no evidence of significant valvular regurgitation or stenosis, nor was there an overt intracardiac shunt by echocardiography. Cardiac CT and cardiac MRI revealed a large serpiginous systemic to pulmonary venovenous collateral located behind the left atrium. The collateral drained into the lower right pulmonary vein as it entered the left atrium. The tributary veins to the "giant" collateral were determined by these images modalities. The patient underwent a percutaneous embolization of this giant venovenous collateral via a remnant supracardinal vein originating from the infrarenal inferior vena cava using two Amplatzer Vascular Plug II. Immediately after the procedure the patient's oxygen saturation increased to 90% on room air at rest. At 2 months follow-up the patient had a marked clinical improvement with oxygen saturation as high as 95% on room air while walking. Our case illustrates a successful embolization of a giant collateral via an embryological venous remnant connecting the IVC to the azygos system. PMID:22936600

  5. Fibrosing mediastinitis with superior vena cava obstruction as the initial presentation of Langerhans' cell histiocytosis in a young child

    Energy Technology Data Exchange (ETDEWEB)

    Trusen, Andreas; Beissert, Matthias; Darge, Kassa [Department of Paediatric Radiology, Institute of Radiodiagnostics, University of Wuerzburg, Josef-Schneider-Strasse 2, 97080 Wuerzburg (Germany); Hebestreit, Helge [University Children' s Hospital, University of Wuerzburg, Wuerzburg (Germany); Marx, Alexander [Institute of Pathology, University of Wuerzburg, Wuerzburg (Germany)

    2003-07-01

    We present a 2-year-old girl with an unusual presentation of Langerhans' cell histiocytosis (LCH). Five months prior to admission to our hospital, she received IV steroids for bronchial obstruction. On admission, clinical signs of SVC obstruction were evident and a mediastinal mass was evident on the chest radiograph and MRI. Biopsy revealed fibrosing mediastinitis. Five months later, osteolysis was present on a skull radiograph. Surgical biopsy of the skull lesion revealed LCH. This case is unique because it demonstrates a rare initial manifestation of LCH that has not been previously reported. Furthermore, the primary, solitary mediastinal manifestation without calcifications was histologically interpreted as fibrosing mediastinitis, and the final diagnosis of LCH was only made after identifying the skull lesion. (orig.)

  6. The CMS Muon Reconstruction Software

    CERN Document Server

    Trocino, Daniele

    2009-01-01

    Muonic final states will provide clean signatures for many physics processes at the LHC. One of the main goals of the Compact Muon Solenoid (CMS) design is thus to ensure efficient and accurate identification and reconstruction of muons. A sophisticated muon system is used for muon identification and stand-alone reconstruction and the inner silicon tracker exploits the high magnetic field to ensure a very precise transverse momentum resolution. The global reconstruction algorithms combine muons reconstructed in the dedicated spectrometer with tracks reconstructed in the inner detector. The CMS reconstruction software is well suited for both offline reconstruction and online event selection (HLT) and its performance has been studied in detail using Monte Carlo simulations. The muon reconstruction has also been employed successfully to reconstruct cosmic muons traversing the CMS detector. The design of the CMS muon identification and reconstruction is presented, as well as its performance on simulated and cosmi...

  7. Hepatic venous outflow reconstruction in adult right lobe living donor liver transplantation without middle hepatic vein

    Institute of Scientific and Technical Information of China (English)

    WU Hong; LU Qiang; CHEN Zhe-yu; MA Yu-kui; LI Jin; YANG Jia-yin; YAN Lü-nan; LI Bo; ZENG Yong; WEN Tian-fu; ZHAO Ji-chun; WANG Wen-tao; XU Ming-qing

    2007-01-01

    Background It is difficult and challenging to reconstruct hepatic venous outflow in adult right lobe living donor liver transplantation (LDLT) without the middle hepatic vein (MHV). Excessive perfusion of the portal vein and venous outflow obstruction will lead to acute congestion of the graft, ultimately resulting in primary nonfunction. Although various reconstruction patterns have been explored in many countries, there is currently no clear consensus. In this study we describe a technique to prevent "chocking" of the graft at the outflow anastomosis with the inferior vena cava (IVC) in LDLT using right lobe graft without the MHV.Methods A retrospective analysis was conducted on clinical data from 55 recipients undergoing LDLT using right lobe grafts without the MHV or reconstruction of hepatic venous outflow. The donor's right hepatic vein (RHV) was anastomosed with a triangular opening of the recipient IVC; the inferior right hepatic vein (IRHV), if large enough, was anastomosed directly to the IVC. The great saphenous vein (GSV) was used for reconstruction of significant MHV tributaries.Results No deaths occurred in any of the donors. Of the 55 recipients, complications occurred in 6, including hepaticvein stricture (1 case), small-for-size syndrome (1), hepatic artery thrombosis (1), intestinal bleeding (1), bile leakage (1),left subphrenic abscess and pulmonary infection (1). A total of three patients died, one from small-for-size syndrome and two from multiple system organ failure.Conclusions The multiple-opening vertical anastomosis was reconstructed with hepatic vein outflow. This technique alleviates surgical risk of living donors, ensures excellent venous drainage, and prevents vascular thromboses and primary nonfunction.

  8. Nipple-areola complex reconstruction

    OpenAIRE

    Nimboriboonporn, Anongporn; Chuthapisith, Suebwong

    2014-01-01

    Nipple areolar reconstruction (NAC) was introduced since 1940s and evolved as parallel with breast reconstruction since era of breast cancer treatment. It consists of nipple and areolar reconstruction. Ideal reconstruction of the NAC requires symmetry in position, size, shape, texture, and pigmentation and permanent projection. There are many innovative ways to create a nipple and each method has its unique characteristics that apply to certain breast types. NAC reconstruction techniques comp...

  9. Alternative reconstruction after pancreaticoduodenectomy

    Directory of Open Access Journals (Sweden)

    Cooperman Avram M

    2008-01-01

    Full Text Available Abstract Background Pancreaticoduodenectomy is the procedure of choice for tumors of the head of the pancreas and periampulla. Despite advances in surgical technique and postoperative care, the procedure continues to carry a high morbidity rate. One of the most common morbidities is delayed gastric emptying with rates of 15%–40%. Following two prolonged cases of delayed gastric emptying, we altered our reconstruction to avoid this complication altogether. Subsequently, our patients underwent a classic pancreaticoduodenectomy with an undivided Roux-en-Y technique for reconstruction. Methods We reviewed the charts of our last 13 Whipple procedures evaluating them for complications, specifically delayed gastric emptying. We compared the outcomes of those patients to a control group of 15 patients who underwent the Whipple procedure with standard reconstruction. Results No instances of delayed gastric emptying occurred in patients who underwent an undivided Roux-en-Y technique for reconstruction. There was 1 wound infection (8%, 1 instance of pneumonia (8%, and 1 instance of bleeding from the gastrojejunal staple line (8%. There was no operative mortality. Conclusion Use of the undivided Roux-en-Y technique for reconstruction following the Whipple procedure may decrease the incidence of delayed gastric emptying. In addition, it has the added benefit of eliminating bile reflux gastritis. Future randomized control trials are recommended to further evaluate the efficacy of the procedure.

  10. Breast Reconstruction with Microvascular

    Directory of Open Access Journals (Sweden)

    David W. Chang

    2012-01-01

    Full Text Available The free muscle-sparing transverse rectus abdominis myocutaneous (MS-TRAM and deepinferior epigastric perforator (DIEP flaps involve transferring skin and subcutaneous tissuefrom the lower abdominal area and have many features that make them well suited forbreast reconstruction. The robust blood supply of the free flap reduces the risk of fat necrosisand also enables aggressive shaping of the flap for breast reconstruction to optimize theaesthetic outcome. In addition, the free MS-TRAM flap and DIEP flap require minimal donorsitesacrifice in most cases. With proper patient selection and safe surgical technique, the freeMS-TRAM flap and DIEP flap can transfer the lower abdominal skin and subcutaneous tissueto provide an aesthetically pleasing breast reconstruction with minimal donor-site morbidity.

  11. Reconstructing random media

    International Nuclear Information System (INIS)

    We formulate a procedure to reconstruct the structure of general random heterogeneous media from limited morphological information by extending the methodology of Rintoul and Torquato [J. Colloid Interface Sci. 186, 467 (1997)] developed for dispersions. The procedure has the advantages that it is simple to implement and generally applicable to multidimensional, multiphase, and anisotropic structures. Furthermore, an extremely useful feature is that it can incorporate any type and number of correlation functions in order to provide as much morphological information as is necessary for accurate reconstruction. We consider a variety of one- and two-dimensional reconstructions, including periodic and random arrays of rods, various distribution of disks, Debye random media, and a Fontainebleau sandstone sample. We also use our algorithm to construct heterogeneous media from specified hypothetical correlation functions, including an exponentially damped, oscillating function as well as physically unrealizable ones. copyright 1998 The American Physical Society

  12. Reconstructed Jets at RHIC

    CERN Document Server

    Salur, Sevil

    2010-01-01

    To precisely measure jets over a large background such as pile up in high luminosity p+p collisions at LHC, a new generation of jet reconstruction algorithms is developed. These algorithms are also applicable to reconstruct jets in the heavy ion environment where large event multiplicities are produced. Energy loss in the medium created in heavy ion collisions are already observed indirectly via inclusive hadron distributions and di-hadron correlations. Jets can be used to study this energy loss in detail with reduced biases. We review the latest results on jet-medium interactions as seen in A+A collisions at RHIC, focusing on the recent progress on jet reconstruction in heavy ion collisions.

  13. Vertex Reconstruction in CMS

    CERN Document Server

    Chabanat, E; D'Hondt, J; Vanlaer, P; Prokofiev, K; Speer, T; Frühwirth, R; Waltenberger, W

    2005-01-01

    Because of the high track multiplicity in the final states expected in proton collisions at the LHC experiments, novel vertex reconstruction algorithms are required. The vertex reconstruction problem can be decomposed into a pattern recognition problem ("vertex finding") and an estimation problem ("vertex fitting"). Starting from least-square methods, ways to render the classical algorithms more robust are discussed and the statistical properties of the novel methods are shown. A whole set of different approaches for the vertex finding problem is presented and compared in relevant physics channels.

  14. The evolving breast reconstruction

    DEFF Research Database (Denmark)

    Thomsen, Jørn Bo; Gunnarsson, Gudjon Leifur

    2014-01-01

    The aim of this editorial is to give an update on the use of the propeller thoracodorsal artery perforator flap (TAP/TDAP-flap) within the field of breast reconstruction. The TAP-flap can be dissected by a combined use of a monopolar cautery and a scalpel. Microsurgical instruments are generally...... not needed. The propeller TAP-flap can be designed in different ways, three of these have been published: (I) an oblique upwards design; (II) a horizontal design; (III) an oblique downward design. The latissimus dorsi-flap is a good and reliable option for breast reconstruction, but has been...

  15. Reconstruction of inflation models

    Energy Technology Data Exchange (ETDEWEB)

    Myrzakulov, Ratbay; Sebastiani, Lorenzo [Eurasian National University, Department of General and Theoretical Physics and Eurasian Center for Theoretical Physics, Astana (Kazakhstan); Zerbini, Sergio [Universita di Trento, Dipartimento di Fisica, Trento (Italy); TIFPA, Istituto Nazionale di Fisica Nucleare, Trento (Italy)

    2015-05-15

    In this paper, we reconstruct viable inflationary models by starting from spectral index and tensor-to-scalar ratio from Planck observations. We analyze three different kinds of models: scalar field theories, fluid cosmology, and f(R)-modified gravity. We recover the well-known R{sup 2} inflation in Jordan-frame and Einstein-frame representation, the massive scalar inflaton models and two models of inhomogeneous fluid. A model of R{sup 2} correction to Einstein's gravity plus a ''cosmological constant'' with an exact solution for early-time acceleration is reconstructed. (orig.)

  16. Tratamento convencional e endovascular para rara associação de doenças: síndrome de veia cava superior e aneurisma aorto-ilíaco - controle após 12 meses Conventional and endovascular treatment for a rare combination of diseases: superior vena cava syndrome and aortoiliac aneurysm - control after 12 months

    Directory of Open Access Journals (Sweden)

    Gustavo Petorossi Solano

    2011-09-01

    Full Text Available A associação entre a síndrome de veia cava superior e uma dilatação aneurismática das artérias aorta e ilíacas não é comum. A abordagem de cada uma destas patologias pode ser efetuada através do modo convencional, com cirurgia aberta ou pela técnica endovascular. Neste trabalho, relatamos as duas modalidades de intervenção cirúrgica executadas e discutimos suas indicações e os resultados deste caso em particular.The association between superior vena cava syndrome and an aorto-iliac aneurysm is not common. The approach to each of theses diseases can be either by the conventional way with open surgery or by endovascular techniques. We report the two methods of surgical intervention and discuss their indications and results in this particular case.

  17. Estudo comparativo da biocompatibilidade da submucosa intestinal porcina e pericárdio bovino usados como enxertos na veia cava de cães Comparative study of the biocompatibility of the porcine intestinal submucosa and bovine pericardium used as grafts in the inferior cava vein of dogs

    Directory of Open Access Journals (Sweden)

    Fernando Hintz Greca

    2005-08-01

    Full Text Available OBJETIVO: Comparar a biocompatibilidade entre submucosa de intestino delgado (SID porcino e o pericárdio bovino como enxerto no reparo de lesões criadas na veia cava inferior de cães. MÉTODOS: Dezesseis cães foram submetidos a laparotomia. Após a abertura da cavidade abdominal a veia cava foi identificada e em seguida procedeu-se com a retirada de um segmento elíptico de 1,5X3cm de sua parede anterior. Em 8 animais o defeito foi reparado com SID porcino (grupo A e nos 8 animais restantes o defeito foi reparado com pericárdio bovino (grupo B.No 30° dia de P.O. realizou-se uma ultra-sonografia e a eutanásia foi realizada no 40°dia de pós-operatório. RESULTADOS: Observou-se estenose da veia cava em 1 cão do grupo do grupo A e em 2 animais do grupo B além de trombose em 1 cão desse mesmo grupo. A análise microscópica revelou um processo inflamatório crônico moderado em ambos os grupos. A endotelização do enxerto, regeneração de fibras musculares lisas e depósito de colágeno também foi similar nos 2 grupos estudados. CONCLUSÃO: A SID provou ser um excelente substrato para a regeneração vascular quando implantado em veia cava superior, contudo os resultados encontrados não diferem daqueles observados com o uso de pericárdio bovino.PURPOSE: To compare the biocompatibility of the bovine pericardium and the small intestine submucosa (SIS when used to repair a created defect in the inferior vena cava of dogs. METHODS: Sixteen male mongrel dogs were submitted to a midline laparotomy incision. An elliptical segment (1,5 X 3,0 cm of the inferior vena cava, below the renal veins, was excised. In 8 dogs, the A group, a patch of porcine small bowel submucosa was used to repair the defect. In the 8 remaining dogs, the B group, a bovine pericardium was implanted in the vena cava. On the 30th post-operative day an ultrasound was performed in order to identify stenosis. The euthanasia was accomplished in the 40th post-operative day

  18. Efficacy of Lower-Extremity Venous Thrombolysis in the Setting of Congenital Absence or Atresia of the Inferior Vena Cava

    Energy Technology Data Exchange (ETDEWEB)

    Ganguli, Suvranu, E-mail: sganguli@partners.org; Kalva, Sanjeeva; Oklu, Rahmi; Walker, T. Gregory; Datta, Neil [Massachusetts General Hospital and Harvard Medical School, Division of Vascular Imaging and Intervention, Department of Imaging (United States); Grabowski, Eric F. [Massachusetts General Hospital and Harvard Medical School, Division of Hematology and Oncology, Department of Pediatrics (United States); Wicky, Stephan [Massachusetts General Hospital and Harvard Medical School, Division of Vascular Imaging and Intervention, Department of Imaging (United States)

    2012-10-15

    Purpose: A rare but described risk factor for deep venous thrombosis (DVT), predominately in the young, is congenital agenesis or atresia of the inferior vena cava (IVC). The optimal management for DVT in this subset of patients is unknown. We evaluated the efficacy of pharmacomechanical catheter-directed thrombolysis (PCDT) followed by systemic anticoagulation in the treatment of acute lower-extremity DVT in the setting of congenital IVC agenesis or atresia. Materials and Methods: Between November of 2005 and May of 2010, six patients (three women [average age 21 years]) were referred to our department with acute lower-extremity DVT and subsequently found to have IVC agenesis or atresia on magnetic resonance imaging. A standardized technique for PCDT (the Angiojet Rheolytic Thrombectomy System followed by the EKOS Microsonic Accelerated Thrombolysis System) was used for all subjects. Successful thrombolysis was followed by systemic heparinization with transition to Coumadin or low molecular-weight heparin and compression stockings. Subjects were followed-up at 1, 3, and then every 6 months after the procedure with clinical assessment and bilateral lower-extremity venous ultrasound. Results: All PCDT procedures were technically successful. No venous stenting or angioplasty was performed. The average thrombolysis time was 28.6 h (range 12-72). Two patients experienced heparin-induced thrombocytopenia, and one patient developed a self-limited knee hemarthrosis, No patients were lost to follow-up. The average length of follow-up was 25.8 {+-} 20.2 months (range 3.8-54.8). No incidence of recurrent DVT was identified. There were no manifestations of postthrombotic syndrome. Conclusions: PCDT followed by systemic anticoagulation and the use of compression stockings appears to be safe and effective in relatively long-term follow-up treatment of patients who present with acute DVT and IVC agenesis or atresia.

  19. Efficacy and Safety of Endovascular Intervention for the Management of Primary Entire-Inferior Vena Cava Occlusion

    Energy Technology Data Exchange (ETDEWEB)

    Zhang, Qingqiao, E-mail: 1427286069@qq.com; Huang, Qianxin, E-mail: 18705206105@163.com; Shen, Bin, E-mail: 753021357@qq.com; Sun, Jingmin, E-mail: 383937658@qq.com; Wang, Xiaolong, E-mail: 781198238@qq.com; Liu, Hongtao, E-mail: hongtao6@vip.sina.com [The Affiliated Hospital of Xuzhou Medical College, Department of Interventional Radiology and Vascular Surgery (China)

    2015-06-15

    PurposeThis study was designed to investigate the safety and efficacy of endovascular intervention for the treatment of primary entire-inferior vena cava (IVC) occlusion.MethodsEndovascular interventions were performed in six patients for the treatment of primary entire-IVC occlusion. IVC and hepatic venography were performed via the jugular and femoral veins. Balloon angioplasty was used to revascularize the hepatic vein and IVC and a stent was placed in the IVC to maintain patency. Postoperative color Doppler ultrasonography was performed at 1, 3, 6, and 12 months, and then annually, to monitor the patency of the hepatic vein and IVC.ResultsThe IVC and one or two hepatic veins were successfully revascularized in five patients. Revascularization was successful in the right and left hepatic veins in one patient; however, IVC patency could not be established in this patient. Eleven Z-type, self-expanding stents were placed into the IVCs of five patients (three stents in two patients, two stents in two patients, and one stent in one patient). There were no instances of postoperative bleeding or mortality. Follow-up was conducted for 18–90 months (42.8 ± 26.5 months). None of the five patients suffered restenosis of the IVC or hepatic veins. However, there was one of the six cases of right hepatic vein restenosis at 18 months postprocedure that was revascularized after a second balloon dilatation.ConclusionsEndovascular intervention is safe and efficacious for the treatment of primary entire-IVC occlusion.

  20. Efficacy of Lower-Extremity Venous Thrombolysis in the Setting of Congenital Absence or Atresia of the Inferior Vena Cava

    International Nuclear Information System (INIS)

    Purpose: A rare but described risk factor for deep venous thrombosis (DVT), predominately in the young, is congenital agenesis or atresia of the inferior vena cava (IVC). The optimal management for DVT in this subset of patients is unknown. We evaluated the efficacy of pharmacomechanical catheter-directed thrombolysis (PCDT) followed by systemic anticoagulation in the treatment of acute lower-extremity DVT in the setting of congenital IVC agenesis or atresia. Materials and Methods: Between November of 2005 and May of 2010, six patients (three women [average age 21 years]) were referred to our department with acute lower-extremity DVT and subsequently found to have IVC agenesis or atresia on magnetic resonance imaging. A standardized technique for PCDT (the Angiojet Rheolytic Thrombectomy System followed by the EKOS Microsonic Accelerated Thrombolysis System) was used for all subjects. Successful thrombolysis was followed by systemic heparinization with transition to Coumadin or low molecular-weight heparin and compression stockings. Subjects were followed-up at 1, 3, and then every 6 months after the procedure with clinical assessment and bilateral lower-extremity venous ultrasound. Results: All PCDT procedures were technically successful. No venous stenting or angioplasty was performed. The average thrombolysis time was 28.6 h (range 12–72). Two patients experienced heparin-induced thrombocytopenia, and one patient developed a self-limited knee hemarthrosis, No patients were lost to follow-up. The average length of follow-up was 25.8 ± 20.2 months (range 3.8–54.8). No incidence of recurrent DVT was identified. There were no manifestations of postthrombotic syndrome. Conclusions: PCDT followed by systemic anticoagulation and the use of compression stockings appears to be safe and effective in relatively long-term follow-up treatment of patients who present with acute DVT and IVC agenesis or atresia.

  1. Mechanism for the tilting of Geunther Tulip inferior vena cava filter inserted via femoral vein: an experimental study in vitro

    International Nuclear Information System (INIS)

    Objective: To clarify the mechanism causing the tilting of Geunther Tulip inferior Vena Cava filter (GTF) which is inserted via femoral vein access by means of the experiment in vitro. Methods: The caval model was established by placing one 25 mm × 10 cm Dacron graft and two 10 mm × 20 cm Dacron grafts into a transparent bifurcate glass tube. The study consisted of two groups: right straight group (GRS) (n=100) and left straight group (GLS) (n=100). The distance (DCH) between the caval right wall and the hook was measured. The degree of tilting (DT) was classified into 5 grades and the data were recorded. Before and after the GTF was released, the angle (ACM1,2) between the axis of IVC and the metal mount, the distance (DCM1,2) between the caval right wall and the metal mount, the angle (ACF) between the axis of IVC and the axis of the filter and the diameter of IVC (DIVC) were measured separately. Results: The degree of GTF tilting in each group revealed a divergent tendency. In Group RS, the apex of the filter tended to be grade Ⅲ compared that in Group LS (59% vs 36%, P=0.003). The differences in most variables between GRS and GLS were considered as statistical significance. Significant positive correlation existed between ACM1 and ACF, ACM1-ACM2 and DCH1-DCH2 in each group, respectively, while significant negative association was also existed between DCH1 and ACF in each group. Conclusion: The tilting angle of GTF filter axis before it is released is a major cause of the occurrence of femoral GTF filter tilting. (authors)

  2. Correlation of the ratio of caudal vena cava diameter and aorta diameter with systolic pressure variation in anesthetized dogs.

    Science.gov (United States)

    Meneghini, Caterina; Rabozzi, Roberto; Franci, Paolo

    2016-02-01

    OBJECTIVE To evaluate the correlation coefficient of the ratio between diameter of the caudal vena cava (CVC) and diameter of the aorta (Ao) in dogs as determined ultrasonographically with systolic pressure variation (SPV). ANIMALS 14 client-owned dogs (9 females and 5 males; mean ± SD age, 73 ± 40 months; mean body weight, 22 ± 7 kg) that underwent anesthesia for repair of skin wounds. PROCEDURES Anesthesia was induced. Controlled mechanical ventilation with a peak inspiratory pressure of 8 cm H2O was immediately started, and SPV was measured. During a brief period of suspension of ventilation, CVC-to-Ao ratio was measured on a transverse right-lateral intercostal ultrasonographic image obtained at the level of the porta hepatis. When the SPV was ≥ 4 mm Hg, at least 1 bolus (3 to 4 mL/kg) of Hartmann solution was administered IV during a 1-minute period. Bolus administration was stopped and the CVC-to-Ao ratio measured when SPV was SPV and CVC-to-Ao ratio before bolus administration were 7 ± 2 mm Hg and 0.52 ± 0.16, respectively. Mean ± SD SPV and CVC-to-Ao ratio after bolus administration were 2 ± 0.6 mm Hg and 0.91 ± 0.13, respectively. CONCLUSIONS AND CLINICAL RELEVANCE In this study, the CVC-to-Ao ratio was a feasible, noninvasive ultrasonographically determined value that correlated well with SPV. (Am J Vet Res 2016;77:137-143). PMID:27027706

  3. Social and Demographic Factors Influencing Inferior Vena Cava Filter Retrieval at a Single Institution in the United States

    Energy Technology Data Exchange (ETDEWEB)

    Smith, S. Christian, E-mail: csmith@aemrc.arizona.edu; Shanks, Candace, E-mail: Candace.Shanks@osumc.edu; Guy, Gregory, E-mail: Gregory.Guy@osumc.edu; Yang, Xiangyu, E-mail: Xiangyu.Yang@osumc.edu; Dowell, Joshua D., E-mail: Joshua.Dowell@osumc.edu [The Ohio State University Wexner Medical Center, Division of Interventional Radiology, Department of Radiology (United States)

    2015-10-15

    PurposeRetrievable inferior vena cava filters (IVCFs) are associated with long-term adverse events that have increased interest in improving filter retrieval rates. Determining the influential patient social and demographic factors affecting IVCF retrieval is important to personalize patient management strategies and attain optimal patient care.Materials and MethodsSeven-hundred and sixty-two patients were retrospectively studied who had a filter placed at our institution between January 2011 and November 2013. Age, gender, race, cancer history, distance to residence from retrieval institution, and insurance status were identified for each patient, and those receiving retrievable IVCFs were further evaluated for retrieval rate and time to retrieval.ResultsOf the 762 filters placed, 133 were permanent filters. Of the 629 retrievable filters placed, 406 met the inclusion criteria and were eligible for retrieval. Results revealed patients with Medicare were less likely to have their filters retrieved (p = 0.031). Older age was also associated with a lower likelihood of retrieval (p < 0.001) as was living further from the medical center (p = 0.027). Patients who were white and had Medicare were more likely than similarly insured black patients to have their filters retrieved (p = 0.024).ConclusionsThe retrieval rate of IVCFs was most influenced by insurance status, distance from the medical center, and age. Race was statistically significant only when combined with insurance status. The results of this study suggest that these patient groups may need closer follow-up in order to obtain optimal IVCF retrieval rates.

  4. Social and Demographic Factors Influencing Inferior Vena Cava Filter Retrieval at a Single Institution in the United States

    International Nuclear Information System (INIS)

    PurposeRetrievable inferior vena cava filters (IVCFs) are associated with long-term adverse events that have increased interest in improving filter retrieval rates. Determining the influential patient social and demographic factors affecting IVCF retrieval is important to personalize patient management strategies and attain optimal patient care.Materials and MethodsSeven-hundred and sixty-two patients were retrospectively studied who had a filter placed at our institution between January 2011 and November 2013. Age, gender, race, cancer history, distance to residence from retrieval institution, and insurance status were identified for each patient, and those receiving retrievable IVCFs were further evaluated for retrieval rate and time to retrieval.ResultsOf the 762 filters placed, 133 were permanent filters. Of the 629 retrievable filters placed, 406 met the inclusion criteria and were eligible for retrieval. Results revealed patients with Medicare were less likely to have their filters retrieved (p = 0.031). Older age was also associated with a lower likelihood of retrieval (p < 0.001) as was living further from the medical center (p = 0.027). Patients who were white and had Medicare were more likely than similarly insured black patients to have their filters retrieved (p = 0.024).ConclusionsThe retrieval rate of IVCFs was most influenced by insurance status, distance from the medical center, and age. Race was statistically significant only when combined with insurance status. The results of this study suggest that these patient groups may need closer follow-up in order to obtain optimal IVCF retrieval rates

  5. Xanthogranulomatous Pyelonephritis in a male child with renal vein thrombus extending into the inferior vena cava: a Case Report

    Directory of Open Access Journals (Sweden)

    Kotasthane Vaishali D

    2010-07-01

    Full Text Available Abstract Background We present a case of Xanthogranulomatous pyelonephritis (XGPN in a male child with renal vein thrombus extending into the inferior vena cava. This is a rare presentation. XGPN is a rare type of renal infection characterised by granulomatous inflammation with giant cells and foamy histiocytes. The peak incidence is in the sixth to seventh decade with a female predominance. XGPN is rare in children. Case presentation An 11 year old male child presented with a history of high grade fever and chills, right flank pain and progressive pyuria for two months. He had a history of vesical calculus for which he was operated four years back. In our case, a subcapsular right nephrectomy was performed. The surgical specimens were formalin fixed and paraffin embedded. The sections were stained with routine Hematoxylin & Eosin stain. Grossly; the kidney was enlarged with adherent capsule and thickening of the perinephric tissue. The pelvicalyceal system was dilated and was filled with a cast of pus. Histological evaluation revealed diffuse necrosis of the renal parenchyma and perinephric fat. Neutrophils, plasma cells, sheets of foamy macrophages and occasional multinucleate giant cells were seen. The renal vein was partially occluded by an inflammatory thrombus with fibrin, platelets and mixed inflammatory cells. The thrombus was focally adherent to the vein wall with organization. Conclusions The clinical presentation and the macroscopic aspect, together with the histological pattern, the cytological characteristics addressed the diagnosis towards XGPN with a vena caval thrombus. Our case illustrates that the diagnosis of XGPN should be considered even in paediatric age group when renal vein and vena caval thrombi are present.

  6. Impact of intra-abdominal pressure on retrohepatic vena cava shape and flow in mechanically ventilated pigs

    International Nuclear Information System (INIS)

    Conflicting results have been found regarding correlations between right atrial pressure (RAP) and inferior vena cava (IVC) diameter in mechanically ventilated patients. This finding could be related to an increase in intra-abdominal pressure (IAP). This study was designed to clarify whether variations in IVC flow rate caused by positive pressure ventilation are associated with changes in the retrohepatic IVC cross-section (ΔIVC) during major changes in volume status and IAP. Nine pigs were anesthetized, mechanically ventilated and equipped. IAP was set at 0, 15 and 30 mmHg during two conditions, i.e. normovolemia and hypovolemia, generated by blood removal to obtain a mean arterial pressure value lower than 60 mmHg. At each IAP increment, cardiac output, IVC flow and surface area were respectively assessed by flowmeters and transesophageal echocardiography. At normal IAP, even in presence of respiratory changes in IVC flows, no ΔIVC were observed during the two conditions. At high IAP, neither ΔIVC nor modulations of IVC flow were observed whatever the volemic status. The majority of animals with an IVC area of less than 0.65 cm2 showed evidence of IAP greater than RAP values. Negative RAP–IAP pressure gradients were found to occur with an IVC area of less than 0.65 cm2, suggesting that IVC dimensions determined using standard ultrasound techniques may indicate the direction of the RAP–IAP gradient. The clinical relevance of the present findings is that volume status should not be estimated from retrohepatic IVC dimensions in cases of high IAP. (paper)

  7. Follow-Up of 6 Patients with Permanent ; Vena Cava Filters in the Prevention of Pulmonary Embolism

    Directory of Open Access Journals (Sweden)

    M. Vahedian

    2011-10-01

    Full Text Available Introduction & Objective: Venous thromboembolic disease is a significant cause of morbidity and mortality in the United States. Deep venous thrombosis (DVT and pulmonary embolism (PE are a spectrum of a single disease entity. In most clinical situations, anticoagulation is the preferred form of therapy .IVC filter placement when using anticoagulation therapy is contraindicated or proves ineffective. The placement of an IVC filter is considered standard preventive treatment for PE. The aim of this study was follow up of patients with permanent vena cava filters in the prevention of pulmonary embolism after six months. Materials & Methods: In this cross sectional study 6 patients with IVC filter were followed up after 6 months. They were examined about having emboli, reccurent DVT, edema, varicosis, bleeding, misplacement, and fracture of filter. Data were analyzed with SPSSV17. Results: 6 patients having a mean age of 58.6 years were evaluated. There was no difference in sex . The reason of admission in all cases was DVT. Doppler sonography was done for all the patients. In 66.66% anticoagulation therapy was done before surgery. The filter was placed percutaneously in all cases. After 6 months in 5 cases there were no signs of DVT, PE, edema, and varicosis. In addition one patient died because of respiratory arrest due to encephalopathy. No complications were seen during admission period. Conclusion: Although IVC filter increases the risk of recurrent DVT in the long term ,it remarkablely decreases the risk of PE.IVC filter is a useful and effective treatment in patients with contraindication of using anticoagulation therapy especially in patients with cancer. (Sci J Hamadan Univ Med Sci 2011;18(2:29-32

  8. Effect of antithrombotic agents on the patency of PTFE-Covered stents in the inferior vena cava: An experimental study

    International Nuclear Information System (INIS)

    Purpose: To evaluate the efficacy of antithrombotic agents in the prevention of stenosis of polytetrafluororethylene (PTFE)-covered stents in the venous system.Methods: Spiral Z stents covered with PTFE (PTFE-covered stents) were placed in the inferior vena cava (IVC) of 34 dogs. Nineteen dogs, used as a control group, were sacrificed at 2, 4, and 12 weeks. Fifteen dogs, previously given antithrombotic agents [cilostazol (n=5), warfarin potassium (n=5), cilostazol plus warfarin potassium (n=5)] were sacrificed at 4 weeks, and then examined angiographically and histopathologically. The effect of the antithrombotic agents was compared between groups.Results: The patency rate of the antithrombotic agent group was 93% (14/15), which was higher than the control group rate of 63% (12/19). The mean stenosis rate of the patent stent at both ends and at the midportion was lower at 4 weeks in the antithrombotic agent group than in the control group. In particular, the mean stenosis rate in the cilostazol plus warfarin potassium group was significantly lower than the control group (Tukey's test, p < 0.05). The mean neointimal thickness of the patent stent at both ends and at the midportion was thinner at 4 weeks in the antithrombotic agent group than in the control group. In particular, the thickness of the neointima in the cilostazol plus warfarin potassium group was significantly decreased when compared with the control group (Tukey's test p < 0.05). At 4 weeks, endothelialization in the antithrombotic agent group tended to be almost identical to that in the control group.Conclusion: The present study suggests that administration of an antithrombotic agent is an effective way of preventing the stenosis induced by a neointimal thickening of PTFE-covered stents in the venous system.

  9. Effect of Antithrombotic Agents on the Patency of PTFE-Covered Stents in the Inferior Vena Cava: An Experimental Study

    International Nuclear Information System (INIS)

    Purpose: To evaluate the efficacy of antithrombotic agents in the prevention of stenosis of polytetrafluoroethylene (PTFE)-covered stents in the venous system. Methods: Spiral Z stents covered with PTFE (PTFE-covered stents) were placed in the inferior vena cava (IVC) of 34 dogs. Nineteen dogs, used as a control group, were sacrificed at 2, 4, and 12 weeks. Fifteen dogs, previously given antithrombotic agents [cilostazol (n= 5), warfarin potassium (n= 5), cilostazol plus warfarin potassium (n= 5)] were sacrificed at 4 weeks, and then examined angiographically and histopathologically. The effect of the antithrombotic agents was compared between groups. Results: The patency rate of the antithrombotic agent group was 93% (14/15), which was higher than the control group rate of 63% (12/19). The mean stenosis rate of the patent stent at both ends and at the midportion was lower at 4 weeks in the antithrombotic agent group than in the control group. In particular, the mean stenosis rate in the cilostazol plus warfarin potassium group was significantly lower than the control group (Tukey's test, p < 0.05). The mean neointimal thickness of the patent stent at both ends and at the midportion was thinner at 4 weeks in the antithrombotic agent group than in the control group. In particular, the thickness of the neointima in the cilostazol plus warfarin potassium group was significantly decreased when compared with the control group (Tukey's test p < 0.05). At 4 weeks, endothelialization in the antithrombotic agent group tended to be almost identical to that in the control group. Conclusion: The present study suggests that administration of an antithrombotic agent is an effective way of preventing the stenosis induced by a neointimal thickening of PTFE-covered stents in the venous system

  10. Triphlorethol-A from Ecklonia cava Up-Regulates the Oxidant Sensitive 8-Oxoguanine DNA Glycosylase 1

    Directory of Open Access Journals (Sweden)

    Ki Cheon Kim

    2014-10-01

    Full Text Available This study investigated the protective mechanisms of triphlorethol-A, isolated from Ecklonia cava, against oxidative stress-induced DNA base damage, especially 8-oxoguanine (8-oxoG, in Chinese hamster lung fibroblast V79-4 cells. 8-Oxoguanine DNA glycosylase-1 (OGG1 plays an important role in the removal of 8-oxoG during the cellular response to DNA base damage. Triphlorethol-A significantly decreased the levels of 8-oxoG induced by H2O2, and this correlated with increases in OGG1 mRNA and OGG1 protein levels. Furthermore, siOGG1-transfected cell attenuated the protective effect of triphlorethol-A against H2O2 treatment. Nuclear factor erythroid 2–related factor 2 (Nrf2 is a transcription factor for OGG1, and Nrf2 combines with small Maf proteins in the nucleus to bind to antioxidant response elements (ARE in the upstream promoter region of the OGG1 gene. Triphlorethol-A restored the expression of nuclear Nrf2, small Maf protein, and the Nrf2-Maf complex, all of which were reduced by oxidative stress. Furthermore, triphlorethol-A increased Nrf2 binding to ARE sequences and the resulting OGG1 promoter activity, both of which were also reduced by oxidative stress. The levels of the phosphorylated forms of Akt kinase, downstream of phosphatidylinositol 3-kinase (PI3K, and Erk, which are regulators of OGG1, were sharply decreased by oxidative stress, but these decreases were prevented by triphlorethol-A. Specific PI3K, Akt, and Erk inhibitors abolished the cytoprotective effects of triphlorethol-A, suggesting that OGG1 induction by triphlorethol-A involves the PI3K/Akt and Erk pathways. Taken together, these data indicate that by activating the DNA repair system, triphlorethol-A exerts protective effects against DNA base damage induced by oxidative stress.

  11. Surgical Ventricular Reconstruction

    Medline Plus

    Full Text Available ... VENTRICULAR RECONSTRUCTION MONTEFIORE-EINSTEIN HEART CENTER NEW YORK CITY, NEW YORK February 13, 2008 00:00:09 ... the Montefiore-Einstein Heart Center in New York City. In just moments, you'll see an expert ...

  12. Liver Trapping of (99m)Tc Macroaggregated Albumin During Ventilation/Perfusion Scintigraphy in a Patient With Superior Vena Cava Stenosis as Demonstrated by SPECT/CT.

    Science.gov (United States)

    Rousseau, Etienne; Leclerc, Yves; Prévost, Sylvain; Keu, Khun Visith

    2015-07-01

    A 50-year-old woman presented to our institution with a 1-day history of right posterior thoracic pain and dyspnea. She had a previous history of conservative resection of a high-grade basal-like infiltrating ductal carcinoma of the right breast 2 years before, subsequently treated by chemotherapy and radiotherapy. A ventilation and perfusion (VQ) scintigraphy performed for suspected pulmonary embolism showed an abnormal deposition of (99m)Tc macroaggregated albumin ((99m)Tc-MAA) in the left lobe of the liver. This unusual finding prompted additional imaging that demonstrated a superior vena cava stenosis. PMID:26018706

  13. [Compensative dilatation of the vena azygos by abnormalities of the vena cava inferior - a contribution to the differential diagnosis of the tumorsuspected right tracheobronchial angle (author's transl)].

    Science.gov (United States)

    Strauss, H J; Strauss, G

    1976-08-01

    Report on 2 patients, with a mediastinal enlargement at the right tracheobronchial angle revealing an ectasis of the orifice of vena-azygos. It could be shown that the enlargement of the vena azygos ist due to an increase of the flow-volume, caused by an abnormal embryonic drainage of the vena cava inferior into the vena azygos. The diagnostic possibilities for differentiation from vascular and nonvascular space-occupying processes in that region are discussed. An exact diagnosis is possible by angiography. PMID:1020364

  14. Breast Reconstruction with Tissue Expansion

    Medline Plus

    Full Text Available ... planning to do a left breast reconstruction, so lift up the flaps here and go underneath the ... breast reconstruction. In this case, we would usually lift the skin flap and the pectoralis major muscle ...

  15. Anterior cruciate ligament reconstruction

    International Nuclear Information System (INIS)

    This paper determines the efficacy of MR imaging in evaluation of the anterior cruciate ligament (ACL) following reconstructive surgery. Forty-three MR examinations were performed in 33 patients who had undergone previous arthroscopic ACL reconstruction with patellar bone-tendon- bone autografts (postoperative period, 1-24 months; mean, 5.2 months). Of the 40 studies performed in clinically stable knees (30 patients), MR demonstrated a well-defined, signal void ACL graft in 36. Of the three studies performed in three patients with clinical ACL laxity or suspected tear, the neoligament was of intermediate definition in one and nondiscernible in the other two. As in the native knee, buckling of the PCL was suggestive of ACL insufficiency. Bone tunnel placement, patellar tendon changes, and joint effusions were also evaluated

  16. Stochastic reconstruction of sandstones

    International Nuclear Information System (INIS)

    A simulated annealing algorithm is employed to generate a stochastic model for a Berea sandstone and a Fontainebleau sandstone, with each a prescribed two-point probability function, lineal-path function, and ''pore size'' distribution function, respectively. We find that the temperature decrease of the annealing has to be rather quick to yield isotropic and percolating configurations. A comparison of simple morphological quantities indicates good agreement between the reconstructions and the original sandstones. Also, the mean survival time of a random walker in the pore space is reproduced with good accuracy. However, a more detailed investigation by means of local porosity theory shows that there may be significant differences of the geometrical connectivity between the reconstructed and the experimental samples. (c) 2000 The American Physical Society

  17. Stochastic reconstruction of sandstones

    Science.gov (United States)

    Manwart; Torquato; Hilfer

    2000-07-01

    A simulated annealing algorithm is employed to generate a stochastic model for a Berea sandstone and a Fontainebleau sandstone, with each a prescribed two-point probability function, lineal-path function, and "pore size" distribution function, respectively. We find that the temperature decrease of the annealing has to be rather quick to yield isotropic and percolating configurations. A comparison of simple morphological quantities indicates good agreement between the reconstructions and the original sandstones. Also, the mean survival time of a random walker in the pore space is reproduced with good accuracy. However, a more detailed investigation by means of local porosity theory shows that there may be significant differences of the geometrical connectivity between the reconstructed and the experimental samples. PMID:11088546

  18. Reconstructing the Tengger calendar

    Directory of Open Access Journals (Sweden)

    Ian Proudfoot

    2008-12-01

    Full Text Available The survival of an Indic calendar among the Tengger people of the Brama highlands in east Java opens a window on Java’s calendar history. Its hybrid form reflects accommodations between this non-Muslim Javanese group and the increasingly dominant Muslim Javanese culture. Reconstruction is challenging because of this hybridity, because of inconsistencies in practice, and because the historical evidence is sketchy and often difficult to interpret.

  19. Reconstructing the Tengger calendar

    OpenAIRE

    Ian Proudfoot

    2008-01-01

    The survival of an Indic calendar among the Tengger people of the Brama highlands in east Java opens a window on Java’s calendar history. Its hybrid form reflects accommodations between this non-Muslim Javanese group and the increasingly dominant Muslim Javanese culture. Reconstruction is challenging because of this hybridity, because of inconsistencies in practice, and because the historical evidence is sketchy and often difficult to interpret.

  20. Reconstructing holographic quintessence

    OpenAIRE

    Zhang, Xin

    2006-01-01

    The holographic dark energy model is an attempt for probing the nature of dark energy within the framework of quantum gravity. The dimensionless parameter $c$ determines the main property of the holographic dark energy. With the choice of $c\\geq 1$, the holographic dark energy can be described completely by a quintessence scalar field. In this paper, we show this quintessential description of the holographic dark energy with $c\\geq 1$ and reconstruct the potential of the quintessence as well ...

  1. LOFAR sparse image reconstruction

    Science.gov (United States)

    Garsden, H.; Girard, J. N.; Starck, J. L.; Corbel, S.; Tasse, C.; Woiselle, A.; McKean, J. P.; van Amesfoort, A. S.; Anderson, J.; Avruch, I. M.; Beck, R.; Bentum, M. J.; Best, P.; Breitling, F.; Broderick, J.; Brüggen, M.; Butcher, H. R.; Ciardi, B.; de Gasperin, F.; de Geus, E.; de Vos, M.; Duscha, S.; Eislöffel, J.; Engels, D.; Falcke, H.; Fallows, R. A.; Fender, R.; Ferrari, C.; Frieswijk, W.; Garrett, M. A.; Grießmeier, J.; Gunst, A. W.; Hassall, T. E.; Heald, G.; Hoeft, M.; Hörandel, J.; van der Horst, A.; Juette, E.; Karastergiou, A.; Kondratiev, V. I.; Kramer, M.; Kuniyoshi, M.; Kuper, G.; Mann, G.; Markoff, S.; McFadden, R.; McKay-Bukowski, D.; Mulcahy, D. D.; Munk, H.; Norden, M. J.; Orru, E.; Paas, H.; Pandey-Pommier, M.; Pandey, V. N.; Pietka, G.; Pizzo, R.; Polatidis, A. G.; Renting, A.; Röttgering, H.; Rowlinson, A.; Schwarz, D.; Sluman, J.; Smirnov, O.; Stappers, B. W.; Steinmetz, M.; Stewart, A.; Swinbank, J.; Tagger, M.; Tang, Y.; Tasse, C.; Thoudam, S.; Toribio, C.; Vermeulen, R.; Vocks, C.; van Weeren, R. J.; Wijnholds, S. J.; Wise, M. W.; Wucknitz, O.; Yatawatta, S.; Zarka, P.; Zensus, A.

    2015-03-01

    Context. The LOw Frequency ARray (LOFAR) radio telescope is a giant digital phased array interferometer with multiple antennas distributed in Europe. It provides discrete sets of Fourier components of the sky brightness. Recovering the original brightness distribution with aperture synthesis forms an inverse problem that can be solved by various deconvolution and minimization methods. Aims: Recent papers have established a clear link between the discrete nature of radio interferometry measurement and the "compressed sensing" (CS) theory, which supports sparse reconstruction methods to form an image from the measured visibilities. Empowered by proximal theory, CS offers a sound framework for efficient global minimization and sparse data representation using fast algorithms. Combined with instrumental direction-dependent effects (DDE) in the scope of a real instrument, we developed and validated a new method based on this framework. Methods: We implemented a sparse reconstruction method in the standard LOFAR imaging tool and compared the photometric and resolution performance of this new imager with that of CLEAN-based methods (CLEAN and MS-CLEAN) with simulated and real LOFAR data. Results: We show that i) sparse reconstruction performs as well as CLEAN in recovering the flux of point sources; ii) performs much better on extended objects (the root mean square error is reduced by a factor of up to 10); and iii) provides a solution with an effective angular resolution 2-3 times better than the CLEAN images. Conclusions: Sparse recovery gives a correct photometry on high dynamic and wide-field images and improved realistic structures of extended sources (of simulated and real LOFAR datasets). This sparse reconstruction method is compatible with modern interferometric imagers that handle DDE corrections (A- and W-projections) required for current and future instruments such as LOFAR and SKA.

  2. Stochastic reconstruction of sandstones

    OpenAIRE

    Manwart, C.; Torquato, S.; Hilfer, R.

    2000-01-01

    A simulated annealing algorithm is employed to generate a stochastic model for a Berea and a Fontainebleau sandstone with prescribed two-point probability function, lineal path function, and ``pore size'' distribution function, respectively. We find that the temperature decrease of the annealing has to be rather quick to yield isotropic and percolating configurations. A comparison of simple morphological quantities indicates good agreement between the reconstructions and the original sandston...

  3. The art of reconstruction

    OpenAIRE

    Healey, Michael; Esson, Michael

    2011-01-01

    The ‘Art of Reconstruction Research Project’ is where re-skilling of plastic surgeons by artists is already in an embryonic phase. In integrating the required network of associated skills, expertise and experience, the research collaboration brings together artists within The Drawing Research Group of The Faculty of Art, Architecture and Design (AAD) and the distinguished work of Professor Mike Esson, Director, The International Drawing Research Institute (IDRI). Th...

  4. Reconstruction of vaginal agenesis.

    Science.gov (United States)

    Ozkan, Ozlenen; Erman Akar, Münire; Ozkan, Omer; Doğan, N Utku

    2011-06-01

    Vaginal ageneses are by no means rare anomalies. Complete Mullerian agenesis is the most common reason for vaginal agenesis requiring reconstruction. Patients usually present with pain, hematocolpos, or hematometra in puberty, and later with amenorrhea and dyspareunia. Detailed information is given here regarding etiologies, timing of surgery, and current treatment options for vaginal agenesis. Outcomes and short- and long-term complications of recent treatment options are also discussed. PMID:21372677

  5. Orthotopic neobladder reconstruction

    OpenAIRE

    Chang, Dwayne T. S.; Nathan Lawrentschuk

    2015-01-01

    Orthotopic neobladder reconstruction is becoming an increasingly common urinary diversion following cystectomy for bladder cancer. This is in recognition of the potential benefits of neobladder surgery over creation of an ileal conduit related to quality of life (QoL), such as avoiding the need to form a stoma with its cosmetic, psychological and other potential complications. The PubMed database was searched using relevant search terms for articles published electronically between January 19...

  6. Repositioning and Leaving In Situ the Central Venous Catheter During Percutaneous Treatment of Associated Superior Vena Cava Syndrome: A Report of Eight Cases

    International Nuclear Information System (INIS)

    Purpose: To describe a combined procedure of repositioning and leaving in situ a central venous catheter followed by immediate percutaneous treatment of associated superior vena cava syndrome (SVCS). Methods: Eight patients are presented who have central venous catheter-associated SVCS (n = 6 Hickman catheters, n = 2 Port-a-cath) caused by central vein stenosis (n = 4) or concomitant thrombosis (n = 4). With the use of a vascular snare introduced via the transcubital or transjugular approach, the tip of the central venous catheter could be engaged, and repositioned after deployment of a stent in the innominate or superior vena cava. Results: In all patients it was technically feasible to reposition the central venous catheter and treat the SVCS at the same time. In one patient flipping of the Hickman catheter in its original position provoked dislocation of the released Palmaz stent, which could be positioned in the right common iliac vein. Conclusion: Repositioning of a central venous catheter just before and after stent deployment in SVCS is technically feasible and a better alternative than preprocedural removal of the vascular access

  7. [On the venous system in the retroperitoneal region (a contribution to the persistence of the primitive vena cava system) (author's transl)].

    Science.gov (United States)

    Besier, H; Stofft, E

    1977-01-01

    A vasal anomaly in the region of the Vena cava inferior is being described in the corpse of a 25-year-old man. 1. In the course of development the V. subcardinalis has not been joined to the Pars hepatica of the V. cava inferior, which originates from the V. hepatis revehens communis. In our case the Anastomosis intersubcardinalis remains and is subjected to a slight retroaortal displacement to the left. 2. Among the Vv. sacrocardinales the V. sacrocardinalis sinistra, which ought to involute after the sixth embryonal week, has been retained together with the Anastomosis intersacrocardinalis. 3. The Vv. supracardinales are connected with the intersubcardinal anastomosis and the intersupracardinal transversal anastomosis has been retained. 4. The Vv. caudales end in the Anastomosis sacrocardinalis at a point before the Sacrum and the Anastomosis intercaudalis has been retained, too. 5. The caudal section of the right lower cardinal vein in its prerenal part is retained with an anastomosis to the right subcardinal vein. 6. The portal blood of the liver is directly distributed to the atrium dextrum after it has passed through three Vv. hepaticae. The Lig. venosum is intrahepatic and is joined to the Vv. hepaticae. 7. The primitive bilateral-symmetric veinous system of the caudal half of the body continues to exist almost completely. PMID:603065

  8. Canal Wall Reconstruction Mastoidectomy

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    Objective To investigate the advantages of canal wall reconstruction (CWR) mastoidectomy, a single-stage technique for cholesteatoma removal and posterior external canal wall reconstruction, over the open and closed procedures in terms of cholesteatoma recurrence. Methods: Between June 2002 and December 2005, 38 patients (40 ears) with cholesteatoma were admited to Sun Yat-Sen Memorial Hospital and received surgical treatments. Of these patients, 25 were male with ages ranging between 11 and 60 years (mean = 31.6 years) and 13 were female with ages ranging between 20 and 65 years (mean = 38.8 years). Canal wall reconstruction (CWR)mastoidectomy was performed in 31 ears and canal wall down (CWD) mastoidectomy in 9 ears. Concha cartilage was used for ear canal wall reconstruction in 22 of the 31 CWR procedures and cortical mastoid bone was used in the remaining 9 cases. Results At 0.5 to 4 years follow up, all but one patients remained free of signs of cholesteatoma recurrence, i.e., no retraction pocket or cholesteatoma matrix. One patient, a smoker, needed revision surgery due to cholesteatoma recurrence 1.5 year after the initial operation. The recurrence rate was therefore 3.2% (1/31). Cholesteatoma recurrence was monitored using postoperative CT scans whenever possible. In the case that needed a revision procedure, a retraction pocket was identified by otoendoscopy in the pars flacida area that eventually evolved into a cholesteatoma. A pocket extending to the epitympanum filled with cholesteatoma matrix was confirmed during the revision operation, A decision to perform a modified mastoidectomy was made as the patient refused to quit smoking. The mean air-bone gap in pure tone threshold was 45 dB before surgery and 25 dB after (p < 0.05). There was no difference between using concha cartilage and cortical mastoid bone for the reconstruction regarding air-bone gap improvement, CT findings and otoendoscopic results. Conclusion CWR mastoidectomy can be used for

  9. Large cell non-Hodgkin's lymphoma masquerading as renal carcinoma with inferior vena cava thrombosis: a case report

    Directory of Open Access Journals (Sweden)

    Weissman Alan

    2011-06-01

    Full Text Available Abstract Introduction Many cancers are associated with inferior vena cava (IVC obstruction, but very few cancers have the ability to propagate within the lumen of the renal vein or the IVC. Renal cell carcinoma is the most common of these cancers. Renal cancer with IVC extension has a high rate of recurrence and a low five year survival rate. Case presentation A 62-year-old Caucasian woman previously in good health developed the sudden onset of severe reflux symptoms and right-sided abdominal pain that radiated around the right flank. A subsequent ultrasound and CT scan revealed a right upper pole renal mass with invasion of the right adrenal gland, liver, left renal vein and IVC. This appeared to be consistent with stage III renal cancer with IVC extension. Metastatic nodules were believed to be present in the right pericardial region; the superficial anterior abdominal wall; the left perirenal, abdominal and pelvic regions; and the left adrenal gland. The pattern of these metastases, as well as the invasion of the liver by the tumor, was thought to be atypical of renal cancer. A needle biopsy of a superficial abdominal wall mass revealed a surprising finding: The malignant cells were diagnostic of large-cell, B-cell non-Hodgkin's lymphoma. The lymphoma responded dramatically to systemic chemotherapy, which avoided the need for nephrectomy. Conclusion Lymphomas only rarely progress via intraluminal vascular extension. We have been able to identify only one other case report of renal lymphoma with renal vein and IVC extension. While renal cancer would have been treated with radical nephrectomy and tumor embolectomy, large-cell B-cell lymphomas are treated primarily with chemotherapy, and nephrectomy would have been detrimental. It is important to remember that, rarely, other types of cancer arise from the kidney which are not derived from the renal tubular epithelium. These may be suspected if an atypical pattern of metastases or unusual

  10. On Stack Reconstruction Problem

    Directory of Open Access Journals (Sweden)

    V. D. Аkeliev

    2014-06-01

    Full Text Available The paper describes analytical investigations that study relation of fuel combustion regimes with concentration values of sulphur anhydride in flue gases and acid dew point. Coefficients of convective heat transfer at internal and external surfaces of stacks have been determined in the paper. The paper reveals the possibility to reconstruct stacks while using gas discharging channel made of composite material on the basis of glass-reinforced plastic which permits to reduce thermo-stressed actions on reinforced concrete and increase volume of released gases due to practically two-fold reduction of gas-dynamic pressure losses along the pipe length.

  11. Evolutionary tree reconstruction

    Science.gov (United States)

    Cheeseman, Peter; Kanefsky, Bob

    1990-01-01

    It is described how Minimum Description Length (MDL) can be applied to the problem of DNA and protein evolutionary tree reconstruction. If there is a set of mutations that transform a common ancestor into a set of the known sequences, and this description is shorter than the information to encode the known sequences directly, then strong evidence for an evolutionary relationship has been found. A heuristic algorithm is described that searches for the simplest tree (smallest MDL) that finds close to optimal trees on the test data. Various ways of extending the MDL theory to more complex evolutionary relationships are discussed.

  12. Non-microsurgical breast reconstruction

    Directory of Open Access Journals (Sweden)

    Sharma Sheel

    2007-12-01

    Full Text Available Breast reconstruction after mastectomy should aim at resulting in an aesthetic outcome that matches the patient′s expectations and without interfering in the oncologic treatment. Whether the reconstruction is performed immediately or in a delayed fashion depends on various factors, which needs detailed attention. Autologous tissue, implants or both are used in the reconstruction. This article reviews the current concepts in these, with emphasis on non-microsurgical methods of using the autologous tissue for reconstruction. Breast conservation has become an accepted practice of treatment. Reconstruction in these situations as well as in an occasion when the surgery is done for failed breast conservation is discussed in detail. The article also reviews the various methods for nipple reconstruction available.

  13. Biomaterials for craniofacial reconstruction

    Directory of Open Access Journals (Sweden)

    Neumann, Andreas

    2009-01-01

    Full Text Available Biomaterials for reconstruction of bony defects of the skull comprise of osteosynthetic materials applied after osteotomies or traumatic fractures and materials to fill bony defects which result from malformation, trauma or tumor resections. Other applications concern functional augmentations for dental implants or aesthetic augmentations in the facial region.For ostheosynthesis, mini- and microplates made from titanium alloys provide major advantages concerning biocompatibility, stability and individual fitting to the implant bed. The necessity of removing asymptomatic plates and screws after fracture healing is still a controversial issue. Risks and costs of secondary surgery for removal face a low rate of complications (due to corrosion products when the material remains in situ. Resorbable osteosynthesis systems have similar mechanical stability and are especially useful in the growing skull.The huge variety of biomaterials for the reconstruction of bony defects makes it difficult to decide which material is adequate for which indication and for which site. The optimal biomaterial that meets every requirement (e.g. biocompatibility, stability, intraoperative fitting, product safety, low costs etc. does not exist. The different material types are (autogenic bone and many alloplastics such as metals (mainly titanium, ceramics, plastics and composites. Future developments aim to improve physical and biological properties, especially regarding surface interactions. To date, tissue engineered bone is far from routine clinical application.

  14. LHCb; LHCb Jet Reconstruction

    CERN Multimedia

    Augusto, O

    2012-01-01

    The Large Hadron Collider (LHC) is the most powerful particle accelerator in the world. It has been designed to collide proton beams at an energy up to 14 TeV in the center of mass. In 2011, the data taking was done with a center of mass energy of 7 TeV, the instant luminosity has reached values greater than $4 \\times 10^{32} cm^{-2} s^{-1}$ and the integrated luminosity reached the value of 1.02 $fb^{-1}$ on the LHCb. The jet reconstruction is fundamental to observe events that can be used to test pertubative QCD (pQCD). It also provides a way to observe standard model channels and searches for new physics like SUSY. The anti-kt algorithm is a jet reconstruction algorithm that is based on the distance of the particles on the space $\\eta \\times \\phi$ and on the transverse momentum of particles. To maximize the energy resolution all information about the trackers and the calo...

  15. Delayed breast implant reconstruction

    DEFF Research Database (Denmark)

    Hvilsom, Gitte B.; Hölmich, Lisbet R.; Steding-Jessen, Marianne;

    2012-01-01

    We evaluated the association between radiation therapy and severe capsular contracture or reoperation after 717 delayed breast implant reconstruction procedures (288 1- and 429 2-stage procedures) identified in the prospective database of the Danish Registry for Plastic Surgery of the Breast during...... the period between 1999 and 2006. A history of radiation therapy was associated with increased risk of severe capsular contracture for 1- and 2-stage procedures, with adjusted hazard ratios (HR) of 3.3 (95% confidence interval [CI]: 0.9-12.4) and 7.2 (95% CI: 2.4-21.4), respectively. Similarly, a...... history of radiation therapy was associated with a non-significantly increased risk of reoperation after both 1-stage (HR = 1.4; 95% CI: 0.7-2.5) and 2-stage (HR = 1.6; 95% CI: 0.9-3.1) procedures. Reconstruction failure was highest (13.2%) in the 2-stage procedures with a history of radiation therapy...

  16. Reconstructing Experiences through Sketching

    CERN Document Server

    Karapanos, Evangelos; Hassenzahl, Marc

    2009-01-01

    This paper presents iScale, a survey tool that aims at eliciting users' experiences with a product from memory. iScale employs sketching in imposing a process in the reconstruction of one's experiences. Two versions of iScale, the Constructive and the Value-Account iScale, were motivated by two distinct theories on how people reconstruct emotional experiences from memory. These two versions were tested in two separate studies. Study 1 aimed at providing qualitative insight into the use of iScale and compared its performance to that of free-hand sketching. Study 2 compared the two iScale versions to a control condition: that of reporting one's experiences without employing any form of sketching. Significant differences between iScale and the "no-sketching" tool were found. Overall, iScale resulted in a) an increase in the number of experience reports that subjects provided, b) an increase in the amount of contextual information for the reported experiences, and c) an increase in subjects' accuracy in recalling...

  17. Three-dimensional ICT reconstruction

    International Nuclear Information System (INIS)

    The three-dimensional ICT reconstruction method is the hot topic of recent ICT technology research. In the context, qualified visual three-dimensional ICT pictures are achieved through multi-piece two-dimensional images accumulation by, combining with thresholding method and linear interpolation. Different direction and different position images of the reconstructed pictures are got by rotation and interception respectively. The convenient and quick method is significantly instructive to more complicated three-dimensional reconstruction of ICT images. (authors)

  18. Phase Retrieval Versus Phaseless Reconstruction

    OpenAIRE

    Botelho-Andrade, Sara; Casazza, Peter G.; Nguyen, Hanh; Tremain, Janet C.

    2015-01-01

    In 2006, Balan/Casazza/Edidin \\cite{BCE} introduced the frame theoretic study of phaseless reconstruction. Since then, this has turned into a very active area of research. Over the years, many people have replaced the term {\\it phaseless reconstruction} with {\\it phase retrieval}. Casazza then asked: {\\it Are these really the same?} In this paper, we will show that phase retrieval is equivalent to phaseless reconstruction. We then show, more generally, that phase retrieval by projections is e...

  19. Reconstruction of symmetric Potts Models

    OpenAIRE

    Sly, Allan

    2008-01-01

    The reconstruction problem on the tree has been studied in numerous contexts including statistical physics, information theory and computational biology. However, rigorous reconstruction thresholds have only been established in a small number of models. We prove the first exact reconstruction threshold in a non-binary model establishing the Kesten-Stigum bound for the 3-state Potts model on regular trees of large degree. We further establish that the Kesten-Stigum bound is not tight for the $...

  20. Unfavourable results in thumb reconstruction

    Directory of Open Access Journals (Sweden)

    Samir M Kumta

    2013-01-01

    Full Text Available The history of thumb reconstruction parallels the history of hand surgery. The attributes that make the thumb unique, and that the reconstructive surgeon must assess and try to restore when reconstructing a thumb, are: Position, stability, strength, length, motion, sensibility and appearance. Deficiency in any of these attributes can reduce the utility of the reconstructed thumb. A detailed assessment of the patient and his requirements needs to be performed before embarking on a thumb reconstruction. Most unsatisfactory results can be attributed to wrong choice of procedure. Component defects of the thumb are commonly treated by tissue from adjacent fingers, hand or forearm. With refinements in microsurgery, the foot has become a major source of tissue for component replacement in the thumb. Bone lengthening, osteoplastic reconstruction, pollicisation, and toe to hand transfers are the commonest methods of thumb reconstruction. Unfavourable results can be classified as functional and aesthetic. Some are common to all types of procedures. However each type of reconstruction has its own unique set of problems. Meticulous planning and execution is essential to give an aesthetic and functionally useful thumb. Secondary surgeries like tendon transfers, bone grafting, debulking, arthrodesis, may be required to correct deficiencies in the reconstruction. Attention needs to be paid to the donor site as well.

  1. Set Reconstruction on the Hypercube

    OpenAIRE

    Pebody, Luke

    2016-01-01

    Given an action of a group $G$ on a set $S$, the $k$-deck of a subset $T$ of $S$ is the multiset of all subsets of $T$ of size $k$, each given up to translation by $G$. For a given subset $T$, the {\\em reconstruction number} of $T$ is the minimum $k$ such that the $k$-deck uniquely identifies $T$ up to translation by $G$, and the {\\em reconstruction number} of the action $G:S$ is the maximum reconstruction number of any subset of $S$. The concept of reconstruction number extends naturally to ...

  2. Virtual 3-D Facial Reconstruction

    Directory of Open Access Journals (Sweden)

    Martin Paul Evison

    2000-06-01

    Full Text Available Facial reconstructions in archaeology allow empathy with people who lived in the past and enjoy considerable popularity with the public. It is a common misconception that facial reconstruction will produce an exact likeness; a resemblance is the best that can be hoped for. Research at Sheffield University is aimed at the development of a computer system for facial reconstruction that will be accurate, rapid, repeatable, accessible and flexible. This research is described and prototypical 3-D facial reconstructions are presented. Interpolation models simulating obesity, ageing and ethnic affiliation are also described. Some strengths and weaknesses in the models, and their potential for application in archaeology are discussed.

  3. Phlegmasia Caerulea Dolens in a Patient With an Inferior Vena Cava Filter: Treatment of Massive Iliocaval Thrombosis Using Local Intravenous Catheter-Directed Thrombolysis

    Energy Technology Data Exchange (ETDEWEB)

    Cookson, Daniel, E-mail: danielthomascookson@yahoo.co.uk [Middlemore Hospital, Department of Radiology (New Zealand); Caldwell, Stuart, E-mail: stuart.caldwell@middlemore.co.nz [Middlemore Hospital, Department of Vascular Surgery (New Zealand)

    2012-10-15

    Phlegmasia caerulea dolens (PCD) is a potentially disastrous complication of inferior vena cava filter insertion, and its optimum management has not been clearly established. We present a case report of a patient with pulmonary embolism and acute adrenal haemorrhage who developed PCD secondary to massive iliocaval thrombosis after insertion of a Cook Celect removable filter. Local intravenous catheter-directed thrombolysis (CDT), followed by systemic anticoagulation, achieved limb salvage and virtual resolution of symptoms at 3 months without complications. CDT can be a successful primary treatment of filter-associated PCD and can be safe in selected patients with acute nontraumatic haemorrhage. Systemic anticoagulation may subsequently restore complete venous patency and may therefore be a useful approach to postthrombolysis management of residual iliocaval thrombus when filter removal is indicated.

  4. Catheter-Directed Thrombolysis of Acute Deep Vein Thrombosis in the Lower Extremity of a Child with Interrupted Inferior Vena Cava

    International Nuclear Information System (INIS)

    We present the case of a 14-year-old girl who developed acute deep vein thrombosis (DVT) in her right lower extremity. Laboratory testing revealed protein S deficiency, and the patient's father also had this abnormality with a history of lower extremity DVT. Manual thromboaspiration followed by catheter-directed thrombolysis resulted in total clearance of all thrombi. Computed tomography and later venography revealed an interrupted inferior vena cava. Catheter-directed thrombolysis is an established treatment for adults with acute DVT. To the best of our knowledge, this report is the first to describe catheter-directed thrombolysis in a pediatric patient with lower extremity DVT. Our results suggest that catheter-directed thrombolysis is safe and effective for use in selected older children and adolescents with acute DVT in the lower extremity

  5. Phlegmasia Caerulea Dolens in a Patient With an Inferior Vena Cava Filter: Treatment of Massive Iliocaval Thrombosis Using Local Intravenous Catheter-Directed Thrombolysis

    International Nuclear Information System (INIS)

    Phlegmasia caerulea dolens (PCD) is a potentially disastrous complication of inferior vena cava filter insertion, and its optimum management has not been clearly established. We present a case report of a patient with pulmonary embolism and acute adrenal haemorrhage who developed PCD secondary to massive iliocaval thrombosis after insertion of a Cook Celect removable filter. Local intravenous catheter-directed thrombolysis (CDT), followed by systemic anticoagulation, achieved limb salvage and virtual resolution of symptoms at 3 months without complications. CDT can be a successful primary treatment of filter-associated PCD and can be safe in selected patients with acute nontraumatic haemorrhage. Systemic anticoagulation may subsequently restore complete venous patency and may therefore be a useful approach to postthrombolysis management of residual iliocaval thrombus when filter removal is indicated.

  6. Case report: Completely unroofed coronary sinus with a left superior vena cava draining into the left atrium studied by cardiovascular magnetic resonance

    International Nuclear Information System (INIS)

    A persistent left superior vena cava (LSVC) draining through a dilated coronary sinus into the right atrium is a relatively common congenital cardiovascular anomaly. It is readily identified by cardiovascular magnetic resonance (CMR). However, a LSVC draining into the left atrium (LA) and associated with unroofing of the coronary sinus, with resulting interatrial communication, is rare and may have important clinical consequences. As with any large atrial septal defect, it can be associated with a higher than expected incidence of pulmonary arterial hypertension, systemic embolization, and brain abscesses. In this report, we present a case of a completely unroofed coronary sinus with a persistent LSVC draining directly into the LA and illustrate the role of CMR in the diagnosis and evaluation of such anomalies

  7. Optimal reconstruction angles

    International Nuclear Information System (INIS)

    The question of optimal projection angles has recently become of interest in the field of reconstruction from projections. Here, studies are concentrated on the n x n pixel space, where literative algorithms such as ART and direct matrix techniques due to Katz are considered. The best angles are determined in a Gauss--Markov statistical sense as well as with respect to a function-theoretical error bound. The possibility of making photon intensity a function of angle is also examined. Finally, the best angles to use in an ART-like algorithm are studied. A certain set of unequally spaced angles was found to be preferred in several contexts. 15 figures, 6 tables

  8. Urogenital Reconstructive Surgery

    DEFF Research Database (Denmark)

    Jakobsen, Lotte Kaasgaard

    the lower urinary tract causes voiding disabilities, renal failure and chronic bladder changes. Children with such malformations often require extensive treatment, and will experience side effects and not always satisfactory results. Aim: To develop an animal model of congenital infravesical......Urogenital reconstructive surgery Lotte Kaasgaard Jakobsen1 Professor Henning Olsen1 Overlæge Gitte Hvistendahl1 Professor Karl-Erik Andersson2 1 – Dept. of Urology, Aarhus University Hospital 2 – Dept. of Gynecology and Obstetrics, Aarhus University hospital Background: Congenital obstruction of...... the fetal bladder to those of the bladder from young pigs used in the animal model. Results: By further characterising the effect of congenital obstruction, regarding urodynamic properties of the bladder and structural changes in the bladder tissue and comparing the results after relief of obstruction...

  9. Reconstructing the Alcatraz escape

    Science.gov (United States)

    Baart, F.; Hoes, O.; Hut, R.; Donchyts, G.; van Leeuwen, E.

    2014-12-01

    In the night of June 12, 1962 three inmates used a raft made of raincoatsto escaped the ultimate maximum security prison island Alcatraz in SanFrancisco, United States. History is unclear about what happened tothe escapees. At what time did they step into the water, did theysurvive, if so, where did they reach land? The fate of the escapees has been the subject of much debate: did theymake landfall on Angel Island, or did the current sweep them out ofthe bay and into the cold pacific ocean? In this presentation, we try to shed light on this historic case using avisualization of a high-resolution hydrodynamic simulation of the San Francisco Bay, combined with historical tidal records. By reconstructing the hydrodynamic conditions and using a particle based simulation of the escapees we show possible scenarios. The interactive model is visualized using both a 3D photorealistic and web based visualization. The "Escape from Alcatraz" scenario demonstrates the capabilities of the 3Di platform. This platform is normally used for overland flooding (1D/2D). The model engine uses a quad tree structure, resulting in an order of magnitude speedup. The subgrid approach takes detailed bathymetry information into account. The inter-model variability is tested by comparing the results with the DFlow Flexible Mesh (DFlowFM) San Francisco Bay model. Interactivity is implemented by converting the models from static programs to interactive libraries, adhering to the Basic ModelInterface (BMI). Interactive models are more suitable for answeringexploratory research questions such as this reconstruction effort. Although these hydrodynamic simulations only provide circumstantialevidence for solving the mystery of what happened during the foggy darknight of June 12, 1962, it can be used as a guidance and provides aninteresting testcase to apply interactive modelling.

  10. Gender Mainstreaming and Sustainable Post Disaster Reconstruction,

    OpenAIRE

    Yumarni, Tri; Amaratunga, Dilanthi; Haigh, Richard

    2013-01-01

    Gender inequalities are barriers to achieve sustainable post disaster reconstruction. Mainstreaming gender equality within post disaster reconstruction process can enhance sustainability of reconstruction. Based on a detailed literature review on post disaster reconstruction, this paper identifies pre-requisite conditions for mainstreaming gender within sustainable post disaster reconstruction as ; awareness of gender needs and concerns, a strong gender policy framework, women ...

  11. The application of GxA8xB9nther Tulip retrievable inferior vena cava filter in interventional treatment for acute deep venous thrombosis of lower extremity

    International Nuclear Information System (INIS)

    Objective: To discuss the therapeutic efficacy and manipulation skill of Gunther Tulip retrievable inferior vena cava filter in interventional treatment for acute deep venous thrombosis of lower extremity. Methods: From September 2007 to April 2008, a total of 36 patients with acute deep venous thrombosis of lower extremity were treated in our hospital. The time of the onset of disease ranged from 1 day to 12 days. The precipitation causes included prolonged lying in bed due to surgery or bone fracture (n = 18) and postpartum (n = 5), while no obvious precipitation causes could be found in 13 patients. Pulmonary embolism was coexisted in 12 cases. Clinically, the affected limb was swelling and painful, the skin was cyan-purple or pale in color with higher skin temperature. The circumferential length of the affected thigh was 3-10 cm longer than that of normal side. Patients with coexisted pulmonary embolism had the clinical presentation of dyspnea, chest pain, hemoptysis, etc. Gunther Tulip retrievable inferior vena cava filter was implanted via femoral venous access or via right internal jugular venous access, which was followed by intravenous transcatheter thrombolysis. Vascular ultrasonography and angiography were performed 45-75 days after the treatment to confirm that there was no fresh or free thrombus in the veins of lower limb or in the pulmonary arteries. When it was confirmed, Gunther Tulip retrievable inferior vena cava filter was taken out via right internal jugular venous access, which was followed by inferior venacavography. After the procedure anticoagulation and antibiotic medication were employed for 3-5 days. A follow-up for 4-10 months was made. Results: A total of 36 Gunther Tulip retrievable inferior vena cava filters were successfully implanted by one procedure, the average time cost for the filter delivery was 1.5 minutes (0.5-5 minutes). During the delivery procedure, the amplitude of elastic displacement of filter was less than 2 mm. One

  12. Breast reconstruction - methods and imaging

    International Nuclear Information System (INIS)

    Silicon implants are used for breast reconstruction or for cosmetic operations. The contribution outlines the role of mammography, sonography and MR for defect assessment, tumour detection and monitoring after prosthesis implantation. Instrument adjustment for mammographic screening of patients with implants is gone into. Autologic reconstruction techniques and protocols of secondary and tertiary early detection are presented. (orig.)

  13. Markov Random Field Surface Reconstruction

    DEFF Research Database (Denmark)

    Paulsen, Rasmus Reinhold; Bærentzen, Jakob Andreas; Larsen, Rasmus

    2010-01-01

    A method for implicit surface reconstruction is proposed. The novelty in this paper is the adaption of Markov Random Field regularization of a distance field. The Markov Random Field formulation allows us to integrate both knowledge about the type of surface we wish to reconstruct (the prior) and...

  14. Blob-enhanced reconstruction technique

    Science.gov (United States)

    Castrillo, Giusy; Cafiero, Gioacchino; Discetti, Stefano; Astarita, Tommaso

    2016-09-01

    A method to enhance the quality of the tomographic reconstruction and, consequently, the 3D velocity measurement accuracy, is presented. The technique is based on integrating information on the objects to be reconstructed within the algebraic reconstruction process. A first guess intensity distribution is produced with a standard algebraic method, then the distribution is rebuilt as a sum of Gaussian blobs, based on location, intensity and size of agglomerates of light intensity surrounding local maxima. The blobs substitution regularizes the particle shape allowing a reduction of the particles discretization errors and of their elongation in the depth direction. The performances of the blob-enhanced reconstruction technique (BERT) are assessed with a 3D synthetic experiment. The results have been compared with those obtained by applying the standard camera simultaneous multiplicative reconstruction technique (CSMART) to the same volume. Several blob-enhanced reconstruction processes, both substituting the blobs at the end of the CSMART algorithm and during the iterations (i.e. using the blob-enhanced reconstruction as predictor for the following iterations), have been tested. The results confirm the enhancement in the velocity measurements accuracy, demonstrating a reduction of the bias error due to the ghost particles. The improvement is more remarkable at the largest tested seeding densities. Additionally, using the blobs distributions as a predictor enables further improvement of the convergence of the reconstruction algorithm, with the improvement being more considerable when substituting the blobs more than once during the process. The BERT process is also applied to multi resolution (MR) CSMART reconstructions, permitting simultaneously to achieve remarkable improvements in the flow field measurements and to benefit from the reduction in computational time due to the MR approach. Finally, BERT is also tested on experimental data, obtaining an increase of the

  15. Drenagem anômala de veia pulmonar inferior direita em veia cava inferior associada a apêndice hepático intracardíaco Anomalous drainage of the right inferior pulmonary vein into the inferior vena cava associated to intrathoracic hepatic appendix

    Directory of Open Access Journals (Sweden)

    Carlos R Moraes

    1988-08-01

    Full Text Available Descreve-se o caso de uma paciente de 61 anos de idade, com drenagem anômala de veia pulmonar inferior direita em veia cava inferior, associada a apêndice hepático intratorácico, herniado através de fenda no diafragma. A correção cirúrgica foi realizada por anastomose direta da veia anômala com o átrio esquerdo, pela redução do apêndice hepático para a cavidade abdominal e, finalmente, pelo fechamento do defeito diafragmático. O pós-operatório decorreu sem qualquer complicação. Os autores chamam a atenção para a raridade do caso.The authors present a case of a 61-year-old woman with anomalous drainage of the right inferior pulmonary vein into the inferior vena cava associated to an intrathoracic hepatic appendix herniated through a diaphragmatic defect. Surgical correction was obtained by direct anastomosis of the anomalous vein to the left atrium, reduction of the hepatic appendix to the abdominal cavity and closure of the diphragmatic defect. The postoperative course was unevenftul. The rarity of this condition is stressed.

  16. Alterações do diâmetro da veia cava caudal nas diferentes fases do ciclo respiratório, como um indicador não invasivo da volémia e correlação com a pressão venosa central

    OpenAIRE

    Monteiro, Carla Alexandra Almeida

    2009-01-01

    ABSTRACT - Ultrasound evaluation of caudal vena cava diameter changes with breathing as an estimate of volemia and central venous pressure - Estimating volemia is essential for the care of critical patients. Traditionally this has been achieved through indirect parameters or invasive methods such as central venous pressure (CVP). Recently several human studies demonstrated that ultrasound (US) kinetic respiratory changes of caudal vena cava (CVC) can be a reliable indicator of the v...

  17. AORTOILIAC AND AORTOFEMORAL RECONSTRUCTION OF OBSTRUCTIVE DISEASE

    NARCIS (Netherlands)

    VANDENAKKER, PJ; VANSCHILFGAARDE, R; BRAND, R; VANBOCKEL, JH; TERPSTRA, JL

    1994-01-01

    This retrospective study evaluates our strategy to limit prosthetic reconstructions for aortoiliac obstructive disease to the diseased segments in 518 patients. There were 363 (70%) reconstructions without femoral anastomotic sites (FEM-0), 107 (21%) reconstructions with one femoral anastomotic site

  18. Vulvovaginal reconstruction for neoplastic disease.

    Science.gov (United States)

    Höckel, Michael; Dornhöfer, Nadja

    2008-06-01

    Current treatment of neoplastic disease that involves the external female genitalia aims to achieve local disease control, but not to restore form and function of these organs. Despite a growing trend to reduce the extent of surgical resection, impaired quality of life after surgery due to severe sexual dysfunction and disturbed body image is common. We postulate that the integration of surgical techniques for vulvar and vaginal reconstruction into primary treatment would improve aesthetic and functional results and therefore quality of life. We systematically searched the literature for surgical procedures designed and validated for vulvovaginal reconstruction. Various skin flaps, both with random vascularisation and those based on vascular territories (ie, axial pattern, fasciocutaneous, musculocutaneous, and bowel flaps), can restore important parts of vulvovaginal form and function with acceptable morbidity at the donor and recipient sites. Appropriate vulvovaginal reconstruction cannot be achieved by doing a few standardised procedures; rather, it necessitates specialists who are familiar with general principles of reconstructive surgery to master many techniques to select the optimum procedure for the individual patient. Vulvovaginal reconstructive surgery has limitations, particularly achievement of functional restoration in irradiated tissue. Physicians who treat women with neoplastic disease of the external genitalia should be aware of the current state of vulvovaginal reconstructive surgery. Prospective controlled clinical trials are warranted to assess the effect of vulvovaginal reconstruction on morbidity and quality of life after treatment. PMID:18510987

  19. Evidence-Based ACL Reconstruction

    Directory of Open Access Journals (Sweden)

    E. Carlos RODRIGUEZ-MERCHAN

    2015-01-01

    Full Text Available There is controversy in the literature regarding a number of topics related to anterior cruciate ligament (ACLreconstruction. The purpose of this article is to answer the following questions: 1 Bone patellar tendon bone (BPTB reconstruction or hamstring reconstruction (HR; 2 Double bundle or single bundle; 3 Allograft or authograft; 4 Early or late reconstruction; 5 Rate of return to sports after ACL reconstruction; 6 Rate of osteoarthritis after ACL reconstruction. A Cochrane Library and PubMed (MEDLINE search of systematic reviews and meta-analysis related to ACL reconstruction was performed. The key words were: ACL reconstruction, systematic reviews and meta-analysis. The main criteria for selection were that the articles were systematic reviews and meta-analysesfocused on the aforementioned questions. Sixty-nine articles were found, but only 26 were selected and reviewed because they had a high grade (I-II of evidence. BPTB-R was associated with better postoperative knee stability but with a higher rate of morbidity. However, the results of both procedures in terms of functional outcome in the long-term were similar. The double-bundle ACL reconstruction technique showed better outcomes in rotational laxity, although functional recovery was similar between single-bundle and double-bundle. Autograft yielded better results than allograft. There was no difference between early and delayed reconstruction. 82% of patients were able to return to some kind of sport participation. 28% of patients presented radiological signs of osteoarthritis with a follow-up of minimum 10 years.

  20. Facial Reconstruction and Rehabilitation.

    Science.gov (United States)

    Guntinas-Lichius, Orlando; Genther, Dane J; Byrne, Patrick J

    2016-01-01

    Extracranial infiltration of the facial nerve by salivary gland tumors is the most frequent cause of facial palsy secondary to malignancy. Nevertheless, facial palsy related to salivary gland cancer is uncommon. Therefore, reconstructive facial reanimation surgery is not a routine undertaking for most head and neck surgeons. The primary aims of facial reanimation are to restore tone, symmetry, and movement to the paralyzed face. Such restoration should improve the patient's objective motor function and subjective quality of life. The surgical procedures for facial reanimation rely heavily on long-established techniques, but many advances and improvements have been made in recent years. In the past, published experiences on strategies for optimizing functional outcomes in facial paralysis patients were primarily based on small case series and described a wide variety of surgical techniques. However, in the recent years, larger series have been published from high-volume centers with significant and specialized experience in surgical and nonsurgical reanimation of the paralyzed face that have informed modern treatment. This chapter reviews the most important diagnostic methods used for the evaluation of facial paralysis to optimize the planning of each individual's treatment and discusses surgical and nonsurgical techniques for facial rehabilitation based on the contemporary literature. PMID:27093062

  1. Reconstructing human evolution

    CERN Document Server

    Cavalli-Sforza, M

    1999-01-01

    One can reconstruct human evolution using modern genetic data and models based on the mathematical theory of evolution and its four major factors : mutation, natural selection, statistical fluctuations in finite populations (random genetic drift), and migration. Archaeology gives some help on the major dates and events of the process. Chances of studying ancient DNA are very limited but there have been a few successful results. Studying DNA instead of proteins, as was done until a few years ago, and in particular the DNA of mitochondria and of the Y chromosome which are transmitted, respectively, by the maternal line and the paternal line, has greatly simplified the analysis. It is now possible to carry the analysis on individuals, while earlier studies were of necessity based on populations. Also the evolution of ÒcultureÓ (i.e. what we learn from others), in particular that of languages, gives some help and can be greatly enlightened by genetic studies. Even though it is largely based on mechanisms of mut...

  2. Orthotopic neobladder reconstruction

    Directory of Open Access Journals (Sweden)

    Dwayne T. S. Chang

    2015-01-01

    Full Text Available Orthotopic neobladder reconstruction is becoming an increasingly common urinary diversion following cystectomy for bladder cancer. This is in recognition of the potential benefits of neobladder surgery over creation of an ileal conduit related to quality of life (QoL, such as avoiding the need to form a stoma with its cosmetic, psychological and other potential complications. The PubMed database was searched using relevant search terms for articles published electronically between January 1994 and April 2014. Full-text articles in English or with English translation were assessed for relevance to the topic before being included in the review. Patients with neobladders have comparable or better post-operative sexual function than those with ileal conduits. They also have comparable QoL to those with ileal conduits. Orthotopic neobladder is a good alternative to ileal conduit in suitable patients who do not want a stoma and are motivated to comply with neobladder training. However, the selection of a neobladder as the urinary diversion of choice requires that patients have good renal and liver functions and are likely to be compliant with neobladder training. With benefits also come potential risks of neobladder formation. These include electrolyte abnormalities and nocturnal incontinence. This short review highlights current aspects of neobladder formation and its potential advantages.

  3. Multimodality Imaging Diagnostic Approach of Systemic-to-Pulmonary Vein Fistulae.

    Science.gov (United States)

    El Ghannudi, Soraya; Germain, Philippe; Jeung, Mi-Young; Jahn, Christine; Hirschi, Sandrine; Roy, Catherine

    2016-03-01

    A 26-year-old man with a history of bilateral lung transplantation for pulmonary cystic fibrosis 6 months before was admitted in our institution for acute heart failure. Cardiac magnetic resonance imaging (CMR) showed an increased aortic output, as aortic flow assessed by velocity mapping was twofold the pulmonary flow, an occluded superior vena cava (SVC), and enlarged azygos vein. A systemic-to-pulmonary vein fistula (SAPVF) was suspected. The selective angiography showed numerous fistulae between intercostals, thyro-cervical, internal mammary arteries and pulmonary veins. The thoracic CT performed before the CMR, which was initially considered as normal, showed well these arteriovenous fistulae after 3D MIP reconstruction. This particular observation highlights the great value of multimodality imaging for the diagnosis of this rare pathology. The MR velocity mapping is a noninvasive imaging technique of great interest to guide the diagnosis of arteriovenous fistulae, and further indicating more invasive complementary imaging modalities like selective arterial angiography. PMID:26603830

  4. Reconstruction tomography from incomplete projections

    International Nuclear Information System (INIS)

    In some instances, reconstruction radionuclide tomography must be carried out from projections that do not include projection values for all portions of the object to be reconstructed. This may occur, for example, when the field of view of the detector is limited, or when an opaque foreign body is present within the object. The effects of such incomplete projections upon reconstructions of computer-simulated phantoms were studied, using iterative and convolution methods. Several methods for reducing the resulting artifacts and inaccuracies are discussed

  5. Evaluation of diagnostic reliability of radionuclide phlebography using 99mTc-MAA to detect deep venous thrombosis; Its role in establishing indications for inferior vena cava filter implantation

    International Nuclear Information System (INIS)

    Radionuclide phlebography (RNP) of the lower extremities and pelvis was performed using 99mTc-MAA in 40 patients with pulmonary thromboembolism. Deep venous thrombosis (DVT) was found in all patients, more frequently in the right calf and in the left iliac veins in 20 patients (55%). RNP and contrast phlebography (CP) were performed in 18 patients and confirmed the presence of DVT in all cases. The greatest specificity of RNP was obtained in the left (92.4%) and in the right pelvis (80%). In 12 of 18 patients in whom a cava filter was implanted, specificity of RNP was 100% for the left thigh and 91.7% for other localizations. In establishing indications for cava filter implantation, RNP should be performed prior to CP and bilaterally, but in case of non-indicated CE, RNP findings should be sufficient. (orig.)

  6. Reconstruction techniques for optoacoustic imaging

    Science.gov (United States)

    Frenz, Martin; Koestli, Kornel P.; Paltauf, Guenther; Schmidt-Kloiber, Heinz; Weber, Heinz P.

    2001-06-01

    Optoacoustics is a method to gain information from inside a tissue. This is done by irradiating a tissue with a short light pulse, which generates a pressure distribution inside the tissue that mirrors the absorber distribution. The pressure distribution measured on the tissue-surface allows, by applying a back-projection method, to calculate a tomography image of the absorber distribution. This study presents a novel computational algorithm based on Fourier transform, which, at least in principle, yields an exact 3D reconstruction of the distribution of absorbed energy density inside turbid media. The reconstruction is based on 2D pressure distributions captured outside at different times. The FFT reconstruction algorithm is first tested in the back projection of simulated pressure transients of small model absorbers, and finally applied to reconstruct the distribution of artificial blood vessels in three dimensions.

  7. Breast Reconstruction with Tissue Expansion

    Medline Plus

    Full Text Available ... to go with Tamoxifen. At that point in time she did not want to get a reconstruction, ... her work and she's more comfortable with her time, she said she wanted to pursue the breast ...

  8. Breast Reconstruction with Tissue Expansion

    Medline Plus

    Full Text Available ... come to my practice a few months ago seeking a left breast reconstruction after mastectomy. She had ... Veritas Collagen Matrix sling in order to help support the expansion because there is possible radiation damage ...

  9. Submicron STIM tomography reconstruction techniques

    International Nuclear Information System (INIS)

    One-dimensional projections of ion energy loss have been converted to areal density using tabulated stopping powers in a scanning transmission ion microscopy (STIM) reconstruction of a test object, displaying a spatial resolution of 0.37 μm. Location and registration of the centre of areal mass density in each projection provides a means of overcoming (a) the misalignment of the specimen rotation axis with the centre of the scan path and (b) deviations of the specimen from its precession around the axis of rotation. Multiplicative algebraic reconstruction technique (ART), filtered backprojection and maximum-entropy algorithms for the reconstruction of the object are considered. Maximum entropy is shown to produce an image with the least number of artifacts. However, when time considerations are taken into account, it is found that filtered backprojection is the preferred algorithm for a tomographic reconstruction. (orig.)

  10. Reconstruction within the Zeldovich approximation

    CERN Document Server

    White, Martin

    2015-01-01

    The Zeldovich approximation, 1st order Lagrangian perturbation theory, provides a good description of the clustering of matter and galaxies on large scales. The acoustic feature in the large-scale correlation function of galaxies imprinted by sound waves in the early Universe has been successfully used as a `standard ruler' to constrain the expansion history of the Universe. The standard ruler can be improved if a process known as density field reconstruction is employed. In this paper we develop the Zeldovich formalism to compute the correlation function of biased tracers in both real- and redshift-space using the simplest reconstruction algorithm with a Gaussian kernel and compare to N-body simulations. The model qualitatively describes the effects of reconstruction on the simulations, though its quantitative success depends upon how redshift-space distortions are handled in the reconstruction algorithm.

  11. Vermilion Reconstruction with Genital Mucosa.

    Science.gov (United States)

    Müller-Richter, Urs D A; Weyandt, Gerhard H; Woeckel, Achim; Kübler, Alexander C

    2016-05-01

    Functional and aesthetical reconstruction, especially of the upper lip after ablative tumor surgery, can be very challenging. The skin of the lip might be sufficiently reconstructed by transpositional flaps from the nasolabial or facial area. Large defects of the lip mucosa, including the vestibule, are even more challenging due to the fact that flaps from the inner lining of the oral cavity often lead to functional impairments. We present a case of multiple vermilion and skin resections of the upper lip. At the last step, we had to resect even the whole vermilion mucosa, including parts of the oral mucosa of the vestibule, leaving a bare orbicularis oris muscle. To reconstruct the mucosal layer, we used a mucosal graft from the labia minora and placed it on the compromised lip and the former transpositional flaps for the reconstructed skin of the upper lip with very good functional and aesthetic results. PMID:27579226

  12. Hubungan Diameter Vena Cava Inferior Dengan Nilai N-Terminal Pro-Brain Natriuretic Peptide (Nt-Probnp) Pada Pasien Gagal Jantung Kronik Tidak Terkompensasi Akibat Penyakit Jantung Koroner Dan Penyakit Jantung Hipertensi di RSUP H. Adam Malik Medan

    OpenAIRE

    T. Realsyah

    2016-01-01

    The inferior vena cava (IVC) diameter and degree of inspiratory collapse areused as echocardiographic indices in the estimation of right atrial pressure. N-terminal pro-B natriuretic peptide (NT-ProBNP) are established biomarkers of myocardial wall stress. There is no informationavailable regarding the association between the IVC diameterand NT-ProBNPs in patients with Decompensated Chronic heart failure. The purpose of this investigationis to analyse the correlation of inferior vena c...

  13. Provincial reconstruction teams improving effectiveness

    OpenAIRE

    Sellers, Cameron S.

    2007-01-01

    Provincial Reconstruction Teams (PRTs) are currently prominent constructs for stabilization and reconstruction in Afghanistan and Iraq. PRTs are composed of civil-military teams, including elements from coalition partners and the host-nation, and involve multiple military services and civilian agencies. Their missions are to extend the legitimacy of the central government throughout the country and to use Civil Military Operations (CMO) to counter anti-government forces. PRTs are prominent,...

  14. Current Concepts in ACL Reconstruction

    OpenAIRE

    Fu, Freddie H; Cohen, Steven B.

    2008-01-01

    Current Concepts in ACL Reconstruction is a complete reference text composed of the most thorough collection of topics on the ACL and its surgical reconstruction compiled, with contributions from some of the world's experts and most experienced ACL surgeons. Various procedures mentioned throughout the text are also demonstrated in an accompanying video CD-ROM. PURPOSE Composing a single, comprehensive and complete information source on ACL including basic sciences, clinical issues, latest con...

  15. Equilibrium Reconstruction in EAST Tokamak

    Institute of Scientific and Technical Information of China (English)

    QIAN Jinping; WAN Baonian; L. L. LAO; SHEN Biao; S. A. SABBAGH; SUN Youwen; LIU Dongmei; XIAO Singjia; REN Qilong; GONG Xianzu; LI Jiangang

    2009-01-01

    Reconstruction of experimental axisymmetric equilibria is an important part of toka-mak data analysis. Fourier expansion is applied to reconstruct the vessel current distribution in EFIT code. Benchmarking and testing calculations are performed to evaluate and validate this algorithm. Two cases for circular and non-circular plasma discharges are presented. Fourier ex-pansion used to fit the eddy current is a robust method and the real time EFIT can be introduced to the plasma control system in the coming campaign.

  16. Reconstructing pedigrees: a stochastic perspective

    OpenAIRE

    Thatte, Bhalchandra D.; Steel, Mike

    2007-01-01

    A pedigree is a directed graph that describes how individuals are related through ancestry in a sexually-reproducing population. In this paper we explore the question of whether one can reconstruct a pedigree by just observing sequence data for present day individuals. This is motivated by the increasing availability of genomic sequences, but in this paper we take a more theoretical approach and consider what models of sequence evolution might allow pedigree reconstruction (given sufficiently...

  17. Technical basis for dose reconstruction

    International Nuclear Information System (INIS)

    The purpose of this paper is to consider two general topics: technical considerations of why dose-reconstruction studies should or should not be performed and methods of dose reconstruction. The first topic is of general and growing interest as the number of dose-reconstruction studies increases, and one asks the question whether it is necessary to perform a dose reconstruction for virtually every site at which, for example, the Department of Energy (DOE) has operated a nuclear-related facility. And there is the broader question of how one might logically draw the line at performing or not performing dose-reconstruction (radiological and chemical) studies for virtually every industrial complex in the entire country. The second question is also of general interest. There is no single correct way to perform a dose-reconstruction study, and it is important not to follow blindly a single method to the point that cheaper, faster, more accurate, and more transparent methods might not be developed and applied

  18. Lip Reconstruction after Tumor Ablation

    Science.gov (United States)

    Ebrahimi, Ali; Kalantar Motamedi, Mohammad Hossein; Ebrahimi, Azin; Kazemi, Mohammad; Shams, Amin; Hashemzadeh, Haleh

    2016-01-01

    Approximately 25% of all oral cavity carcinomas involve the lips, and the primary management of these lesions is complete surgical resection. Loss of tissue in the lips after resection is treated with a variety of techniques, depending on the extension and location of the defect. Here we review highly accepted techniques of lip reconstruction and some of new trials with significant clinical results. Reconstruction choice is primarily depend to size of the defect, localization of defect, elasticity of tissues. But patient’s age, comorbidities, and motivation are also important. According to the defect location and size, different reconstruction methods can be used. For defects involved less than 30% of lips, primary closures are sufficient. In defects with 35–70% lip involvement, the Karapandzic, Abbe, Estlander, McGregor or Gillies’ fan flaps or their modifications can be used. When lip remaining tissues are insufficient, cheek tissue can be used in Webster and Bernard advancement flaps and their various modifications. Deltopectoral or radial forearm free flaps can be options for large defects of the lip extending to the Jaws. To achieve best functional and esthetic results, surgeons should be able to choose most appropriate reconstruction method. Considering defects’ size and location, patients’ expects and surgeon’s ability and knowledge, a variety of flaps are presented in order to reconstruct defects resulted from tumor ablation. It’s necessary for surgeons to trace the recent innovations in lip reconstruction to offer best choices to patients. PMID:27308236

  19. Nursing Care of 4 Patients with Inferior Vena Cava Thrombosis Treated by Temporary Inferior Vena Cava Filter plus Catheter-directed Thrombolysis%4例肾静脉以上临时性腔静脉滤器植入联合导管溶栓治疗下腔静脉血栓患者的护理

    Institute of Scientific and Technical Information of China (English)

    周菊珍; 金伟飞; 蒋美; 姚碧连

    2012-01-01

    This paper summarized the nursing experience of four cases of patients with inferior vena cava thrombosis, which were treated with temporary inferior vena cava filter (IVCF) combined with catheter-directed thrombolysis. The importance of nursing went to the placement of IVCF to prevent its displacement, limb nursing and catheter-directed thrombolysis. All the laboratory indexes were under the monitoring and measures were taken for the prevention of complication of pulmonary embolism and education for discharge was conducted as well. During the treatment, bleeding in puncture point occurred in one case, displacement of catheter one case and gastrointestinal bleeding one case and after treatment, all the swelling of extremities and inferior vena cava thrombosis disappeared. IVCF was removed 3 to 4 weeks after discharge and after 3 to 38 months follow-ups, no thrombosis reoccurred.%总结4例下腔静脉血栓患者行肾静脉以上临时腔静脉滤器植入联合腔内导管溶栓治疗的护理经验.做好临时性腔静脉滤器置入的护理,严防滤器移位;做好肢体护理及导管溶栓护理;密切观察患者出血情况,监测实验室指标;预防和观察肺栓塞并发症;做好出院指导.4例患者患肢肿胀消退,下腔静脉血栓均消失,出现穿刺点出血1例,导管移位1例,消化道出血1例,经及时发现积极治疗护理,痊愈出院,术后3~4 周拔除临时滤器,随防3~38 个月无血栓复发.

  20. On $\\mathfrak{I}$-reconstruction Property

    OpenAIRE

    Vashisht, L. K.; Khattar, Geetika

    2013-01-01

    Reconstruction property in Banach spaces introduced and studied by Casazza and Christensen in [1]. In this paper we introduce reconstruction property in Banach spaces which satisfy $\\mathfrak{I}$-property. A characterization of reconstruction property in Banach spaces which satisfy $\\mathfrak{I}$-property in terms of frames in Banach spaces is obtained. Banach frames associated with reconstruction property are discussed.

  1. Ulnar Collateral Ligament Reconstruction

    Science.gov (United States)

    Erickson, Brandon J.; Bach, Bernard R.; Cohen, Mark S.; Bush-Joseph, Charles A.; Cole, Brian J.; Verma, Nikhil N.; Nicholson, Gregory P.; Romeo, Anthony A.

    2016-01-01

    Background: Ulnar collateral ligament reconstruction (UCLR) is a common surgery performed in professional, collegiate, and high school athletes. Purpose: To report patient demographics, surgical techniques, and outcomes of all UCLRs performed at a single institution from 2004 to 2014. Study Design: Case series; Level of evidence, 4. Methods: All patients who underwent UCLR from January 1, 2004, through December 31, 2014, at a single institution were identified. Charts were reviewed to determine patient age, sex, date of surgery, sport played, athletic level, surgical technique, graft type, and complications. Data were collected prospectively, and patients were contacted via phone calls to obtain the return-to-sport rate, Conway-Jobe score, Andrews-Timmerman score, and Kerlan-Jobe Orthopaedic Clinic (KJOC) Shoulder and Elbow score. Continuous variable data were reported as weighted means, and categorical variable data were reported as frequencies with percentages. Results: A total of 187 patients (188 elbows) underwent UCLR during the study period (92% male; mean age, 19.6 ± 4.7 years; 78.2% right elbows). There were 165 baseball players (87.8% of all patients), 155 of whom were pitchers (82.5% of all patients). Ninety-seven (51.6%) were college athletes, 68 (36.2%) high school athletes, and 7 (3.7%) professional athletes at the time of surgery. The docking technique was used in 110 (58.5%) patients while the double-docking technique was used in 78 (41.5%). An ipsilateral palmaris longus graft was used in 110 (58.5%) patients while a hamstring autograft was used in 48 (25.5%) patients. The ulnar nerve was subcutaneously transposed in 79 (42%) patients. Clinical follow-up data were available on 85 patients. Mean follow-up was 60 ± 30.8 months. Overall, 94.1% of patients were able to return to sport and had a Conway-Jobe score of good/excellent while 4.3% had a score of fair. The mean KJOC score was 90.4 ± 6.7 and mean Andrews-Timmerman score was 92.5 ± 7

  2. Titanium template for scaphoid reconstruction.

    Science.gov (United States)

    Haefeli, M; Schaefer, D J; Schumacher, R; Müller-Gerbl, M; Honigmann, P

    2015-06-01

    Reconstruction of a non-united scaphoid with a humpback deformity involves resection of the non-union followed by bone grafting and fixation of the fragments. Intraoperative control of the reconstruction is difficult owing to the complex three-dimensional shape of the scaphoid and the other carpal bones overlying the scaphoid on lateral radiographs. We developed a titanium template that fits exactly to the surfaces of the proximal and distal scaphoid poles to define their position relative to each other after resection of the non-union. The templates were designed on three-dimensional computed tomography reconstructions and manufactured using selective laser melting technology. Ten conserved human wrists were used to simulate the reconstruction. The achieved precision measured as the deviation of the surface of the reconstructed scaphoid from its virtual counterpart was good in five cases (maximal difference 1.5 mm), moderate in one case (maximal difference 3 mm) and inadequate in four cases (difference more than 3 mm). The main problems were attributed to the template design and can be avoided by improved pre-operative planning, as shown in a clinical case. PMID:25167978

  3. Defining the surface anatomy of the central venous system in children.

    Science.gov (United States)

    Tarr, Gregory P; Pak, Neda; Taghavi, Kiarash; Iwan, Tom; Dumble, Charlotte; Davies-Payne, David; Mirjalili, S Ali

    2016-03-01

    Pediatric emergency physicians, pediatric critical care specialists, and pediatric surgeons perform central venous catheterization in many clinical settings. Complications of the procedure are not uncommon and can be fatal. Despite the frequency of application, the evidence-base describing the surface landmarks involved is missing. The aim of the current study was to critically investigate the surface markings of the central venous system in children. The superior vena cava/right atrial (SVC/RA) junction, superior vena cava (SVC) formation, and brachiocephalic vein (BCV) formation were examined independently by two investigators. Three hundred computed tomography (CT) scans collected across multiple centers were categorized by age group into: 0-3 years, 4-7 years, and 8-11 years. Scans with pathology that distorted or obscured the regional anatomy were excluded. The BCV formation was commonly found behind the ipsilateral medial clavicular head throughout childhood. This contrasts with the variable levels of SVC formation, SVC length, and SVC/RA junction. In the youngest group, SVC formation was most commonly at the second costal cartilage (CC), but moved to the first CC/first intercostal space (ICS) as the child grew. The SVC/RA junction was at the fourth CC in the youngest group and moved to the third CC/third ICS as the child grew. This study demonstrates the variable anatomy of SVC formation and the SVC/RA junction with respect to rib level. This variability underscores the unreliability of surface anatomical landmarks of the SVC/RA junction as a guide to catheter tip position. Clin. Anat. 29:157-164, 2016. © 2015 Wiley Periodicals, Inc. PMID:26518452

  4. Effect of utilization of veno-venous bypass vs. cardiopulmonary bypass on complications for high level inferior vena cava tumor thrombectomy and concomitant radical nephrectomy

    Directory of Open Access Journals (Sweden)

    Ross M. Simon

    2015-10-01

    Full Text Available ABSTRACT Purpose: To determine if patients with renal cell carcinoma (RCC with levels III and IV tumor thrombi are receive any reduction in complication rate utilizing veno-venous bypass (VVB over cardiopulmonary bypass (CPB for high level (III/IV inferior vena cava (IVC tumor thrombectomy and concomitant radical nephrectomy. Materials and Methods: From May 1990 to August 2011, we reviewed 21 patients that had been treated for RCC with radical nephrectomy and concomitant IVC thrombectomy employing either CPB (n =16 or VVB (n=5. We retrospectively reviewed our study population for complication rates and perioperative characteristics. Results: Our results are reported using the validated Dindo-Clavien Classification system comparing the VVB and CPB cohorts. No significant difference was noted in minor complication rate (60.0% versus 68.7%, P=1.0, major complication rate (40.0% versus 31.3%, P=1.0, or overall complication rate (60.0% versus 62.5%, P=1.0 comparing VVB versus CPB. We also demonstrated a trend towards decreased time on bypass (P=0.09 in the VVB cohort. Conclusion: The use of VVB over CPB provides no decrease in minor, major, or overall complication rate. The use of VVB however, can be employed on an individualized basis with final decision on vascular bypass selection left to the discretion of the surgeon based on specifics of the individual case.

  5. 下腔静脉癌栓的诊治进展%Advancements in Diagnosis and Treatment of Inferior Vena Cava Tumor Thrombus

    Institute of Scientific and Technical Information of China (English)

    郝嘉; 游凯

    2011-01-01

    下腔静脉癌栓常在恶性肿瘤中伴发,治疗上仍较棘手.目前如何选择适宜的诊治方法和它对肿瘤预后的影响尚未达成共识.现系统回顾下腔静脉癌栓的分型、诊断、围术期的综合治疗方法和预后方面的进展,重点综述外科治疗下腔静脉癌栓的各种辅助方法、手术切口和术后联合治疗方式.%Inferior vena cava tumor thrombus ( IVCTT) is one of the factors resulting in a poor prognosis for patients with carcmoma.The classification, improvement of diagnosis, comprehensive treatments, and overall suwival of IVCTT were analyzed. The review focuses on multiple surpcal methods, incision access, and combined postoperative therapies.

  6. Diagnosis of an infected central venous catheter with ultrasound and computed tomography; Diagnose eines infizierten Thrombus der Vena cava inferior mit Sonographie und Computertomographie

    Energy Technology Data Exchange (ETDEWEB)

    Tacke, J. [RWTH Aachen (Germany). Klinik fuer Radiologische Diagnostik; Adam, G. [RWTH Aachen (Germany). Klinik fuer Radiologische Diagnostik; Sliwka, U. [RWTH Aachen (Germany). Neurologische Klinik; Klosterhalfen, B. [RWTH Aachen (Germany). Inst. fuer Pathologie; Schoendube, F. [RWTH Aachen (Germany). Klinik fuer Thorax- Herz- und Gefaesschirurgie

    1995-08-01

    The authors report the case of a 16-year-old male patient, who suffered from meningitis and Waterhouse-Friderichsen syndrome. After initial improvement in the intensive care unit, he developed septic temperatures, caused by an infected thrombus of a central venous catheter in the inferior vena cava, Color-coded ultrasound showed hyperechogenic signals and missing flow detection at the catheter tip. Computed tomography showed air bubbles in the thrombosed catheter tip and confirmed the diagnosis. Vasuclar surgery was done and an infected, 17-cm-long infected thrombus was removed. (orig./VHE) [Deutsch] Die Autoren berichten ueber den Fall eines 16jaehrigen Patienten, dem wegen einer Meningitis und der Zeichen eines Waterhouse-Friderichsen-Syndroms ein femoralvenoeser Zentralkatheter gelegt wurde. Nach initialer Entfieberung entwickelte sich eine Sepsis, deren Ursache in einem infizierten Thrombus des Zentralvenenkatheters lag. Die Diagnose wurde sonographisch gestellt und nachfolgend computertomographisch bestaetigt. In beiden Verfahren wiesen Lufteinschluesse im Katheterthrombus auf die Injektion hin. Der Befund wurde durch eine gefaesschirurgische Thrombektomie bestaetigt und therapiert. (orig./VHE)

  7. Measurement of Anterior-Posterior Diameter of Inferior Vena Cava by Ultrasonography: A Non-Invasive Method for Estimation of Central Venous Pressure

    Directory of Open Access Journals (Sweden)

    R. Nafisi-Moghadam

    2007-05-01

    Full Text Available Background and Objective: The assessment of blood volume is now one of the most commonly needed interventions in the first line of care and severe ill patients. Measuring central venous pressure (CVP is an invasive method, most frequently used in clinical practice for the assessment of volume status. The di-ameter of the inferior vena cava (IVC is a parameter to estimate central venous pressure. The purpose of this study was to determine whether measurement of the anterior-posterior diameter of the IVC by ultra-sonography, correlates with CVP. Materials and Methods: It was a descriptive and pro-spective study on 50 patients; CVP was measured in supine position by CVP manometer. Anterior – pos-terior IVC diameter was assessed by ultrasonography during inspiration and expiration. Results: The mean of CVP during inspiration and ex-piration was 11.31+5.59, 12.20 + 5.65cmH2o, respec-tively. The mean of inspiratory and expiratory IVC diameter was 7.71+3.56, 11.97+3.28 mm, respectively. There was significant relation between CVP and IVC diameter in the inspiration (r=0.664, p<0.0001 and expiration (r=0.495, p=0.001. The relation between these two variables was linear. Conclusion: Result of this study showed that IVC di-ameter measurement by ultrasonography can be used to estimate the mean of CVP.

  8. Contrast-fluid level in the inferior vena cava (IVC niveau sign) in patients with acute type A aortic dissection. Computed tomography findings during acute cardiac tamponade

    International Nuclear Information System (INIS)

    The purpose of this study was to report a new computed tomography (CT) finding in acute cardiac tamponade: a contrast-fluid level in the hepatic inferior vena cava (IVC) during an arterial dominant phase CT study (IVC niveau sign) in patients with acute type A aortic dissection. We retrospectively reviewed CT studies with the diagnosis of proximal aortic dissection (Stanford type A) with acute cardiac tamponade. There were 12 patients enrolled in the study (6 women, 6 men; mean age 66 years). A total of 62 patients were selected as a control chronic pericardial effusion group to compare with the acute cardiac tamponade group. Among the 12 patients with acute cardiac tamponade, the IVC niveau sign was seen in 7 (58%). In the control chronic pericardial effusion group (n=62), we identified the IVC niveau sign in only one patient (1.6%). There was a significant difference in the presence of the IVC niveau sign between the acute cardiac tamponade and chronic pericardial effusion groups (P<0.0001). The presence of the IVC niveau sign suggests acute cardiac tamponade in patients with acute type A aortic dissection. (author)

  9. Thrombolysis for treating deep venous thrombosis by high-dose urokinase: the usefulness of preventive placement of inferior vena cava filter

    International Nuclear Information System (INIS)

    Objective: To investigate the feasibility and efficacy of high-dose urokinase thrombolysis for treating lower limb deep venous thrombosis (DVT) after inferior vena cava (IVC) filter placement. Methods: Thirteen patients of venographically proved DVT underwent preventive IVC filter placement for thrombolysis by high-dose urokinase. Antegrade infusion of high-dose urokinase was performed via the dorsalis pedis vein of the involved lower limb. The total dose of urokinase was 9 000 000 ∼ 16 000 000 units, and the procedure of thrombolysis was performed in ICU ward where the patients were closely monitored clinically and laboratorially. Results: A total of 13 IVC filters were successfully deployed without disposition and migration. The therapeutic effects were divided into four scales as follows: complete disappearance of the venous thrombosis and clinically asymptomatic (n = 2); remarkable recovery characterized by markedly improved clinical symptoms and venographically proved patent lumen in which the diameter was larger than 70% (n = 9); effective treatment indicating improved symptoms to some degrees and venographically proved patent lumen in which the diameter was smaller than 70% ( n = 2); and ineffective treatment (n = 0). No pulmonary embolism and hemorrhage occurred during the procedure of thrombolysis. Conclusion: High-dose urokinase for treating DVT is safe and effective after preventive placement of IVC filter

  10. CURRENT CONCEPTS IN ACL RECONSTRUCTION

    Directory of Open Access Journals (Sweden)

    Freddie H. Fu

    2008-09-01

    Full Text Available Current Concepts in ACL Reconstruction is a complete reference text composed of the most thorough collection of topics on the ACL and its surgical reconstruction compiled, with contributions from some of the world's experts and most experienced ACL surgeons. Various procedures mentioned throughout the text are also demonstrated in an accompanying video CD-ROM. PURPOSE Composing a single, comprehensive and complete information source on ACL including basic sciences, clinical issues, latest concepts and surgical techniques, from evaluation to outcome, from history to future, editors and contributors have targeted to keep the audience pace with the latest concepts and techniques for the evaluation and the treatment of ACL injuries. FEATURES The text is composed of 27 chapters in 6 sections. The first section is mostly about basic sciences, also history of the ACL, imaging, clinical approach to adolescent and pediatric patients are subjected. In the second section, Graft Choices and Arthroscopy Portals for ACL Reconstruction are mentioned. The third section is about the technique and the outcome of the single-bundle ACL reconstruction. The fourth chapter includes the techniques and outcome of the double-bundle ACL reconstruction. In the fifth chapter revision, navigation technology, rehabilitation and the evaluation of the outcome of ACL reconstruction is subjected. The sixth/the last chapter is about the future advances to reach: What We Have Learned and the Future of ACL Reconstruction. AUDIENCE Orthopedic residents, sports traumatology and knee surgery fellows, orthopedic surgeons, also scientists in basic sciences or clinicians who are studying or planning a research on ACL forms the audience group of this book. ASSESSMENT This is the latest, the most complete and comprehensive textbook of ACL reconstruction produced by the editorial work up of two pioneer and masters "Freddie H. Fu MD and Steven B. Cohen MD" with the contribution of world

  11. The reconstruction of inflationary potentials

    Science.gov (United States)

    Lin, Jianmang; Gao, Qing; Gong, Yungui

    2016-07-01

    The observational data on the anisotropy of the cosmic microwave background constraints the scalar spectral tilt ns and the tensor to scalar ratio r which depend on the first and second derivatives of the inflaton potential. The information can be used to reconstruct the inflaton potential in the polynomial form up to some orders. However, for some classes of potentials, ns and r behave as ns(N) and r(N) universally in terms of the number of e-folds N. The universal behaviour of ns(N) can be used to reconstruct a class of inflaton potentials. By parametrizing one of the parameters ns(N), ɛ(N) and φ(N), and fitting the parameters in the models to the observational data, we obtain the constraints on the parameters and reconstruct the classes of the inflationary models which include the chaotic inflation, T-model, hilltop inflation, s-dual inflation, natural inflation and R2 inflation.

  12. Network reconstruction from infection cascades

    CERN Document Server

    Braunstein, Alfredo

    2016-01-01

    Reconstructing propagation networks from observations is a fundamental inverse problem, and it's crucial to understand and control dynamics in complex systems. Here we show that it is possible to reconstruct the whole structure of an interaction network and to simultaneously infer the complete time course of activation spreading, relying just on single snapshots of a small number of activity cascades. The method, that we called Inverse Dynamics Network Reconstruction (IDNR), is shown to work successfully on several synthetic and real networks, inferring the networks and the sources of infection based on sparse observations, including single snapshots. IDNR is built on a Belief Propagation approximation, that has an impressive performance in a wide variety of topological structures. The method can be applied in absence of complete time-series data by providing a detailed modeling of the posterior distribution of trajectories conditioned to the observations. Furthermore, we show by experiments that the informat...

  13. Reconstructing Ancient Forms of Life

    Science.gov (United States)

    Benner, Steven A.

    1998-01-01

    Progress in the past three months has occurred in two areas, reconstruction of ancestral proteins and improved understanding of chemical features that are likely to be universal in generic matter regardless of its genesis. Ancestral ribonucleases have been reconstructed, and an example has been developed that shows how physiological function can be assigned to in vitro behaviors observed in biological systems. Sequence data have been collected to permit the reconstruction of src homology 2 domains that underwent radiative divergence at the time of the radiative divergence of chordates. New studies have been completed that show how genetic matter (or its remnants) might be detected on Mars (or other non-terrean locations.) Last, the first in vitro selection experiments have been completed using a nucleoside library carrying positively charged functionality, illustrating the importance of non-standard nucleotides to those attempting to obtain evidence for an "RNA world" as an early episode of life on earth.

  14. Shape Reconstruction from Generalized Projections

    Science.gov (United States)

    Viikinkoski, Matti

    2016-01-01

    In this thesis we develop methods for recovering the three-dimensional shape of an object from generalized projections. We particularly focus on the problems encountered when data are presented as discrete image fields. We demonstrate the usefulness of the Fourier transform in transferring the image data and shape model projections to a domain more suitable for gradient based optimization. To substantiate the general applicability of our methods to observational astronomy, we reconstruct shape models for several asteroids observed with adaptive optics, thermal infrared interferometry, or range-Doppler radar. The reconstructions are carried out with the ADAM software package that we have designed for general use.

  15. Reconstructing WKB from topological recursion

    CERN Document Server

    Bouchard, Vincent

    2016-01-01

    We prove that the topological recursion reconstructs the WKB expansion of a quantum curve for all spectral curves whose Newton polygons have no interior point (and that are smooth as affine curves). This includes nearly all previously known cases in the literature, and many more; in particular, it includes many quantum curves of order greater than two. We also explore the connection between the choice of ordering in the quantization of the spectral curve and the choice of integration divisor to reconstruct the WKB expansion.

  16. Paleoenvironmental reconstruction using microfossils : terrestrial

    International Nuclear Information System (INIS)

    The following section provides a brief summary of the use of pollen and chironomids in terrestrial paleoenvironmental reconstruction and lists some key references and general text addressing the history, methods and development of these techniques in Quaternary paleoclimate research and their application in New Zealand. (author). 52 refs., 8 figs

  17. Reconstructing Indo-European Syllabification

    Science.gov (United States)

    Byrd, Andrew Miles

    2010-01-01

    The chief concern of this dissertation is to investigate a fundamental, yet unsolved problem within the phonology of Proto-Indo-European (PIE): the process of syllabification. I show that by analyzing the much more easily reconstructable word-edge clusters we may predict which types of consonant clusters can occur word-medially, provided that we…

  18. A survey of urban reconstruction

    KAUST Repository

    Musialski, Przemyslaw

    2013-05-10

    This paper provides a comprehensive overview of urban reconstruction. While there exists a considerable body of literature, this topic is still under active research. The work reviewed in this survey stems from the following three research communities: computer graphics, computer vision and photogrammetry and remote sensing. Our goal is to provide a survey that will help researchers to better position their own work in the context of existing solutions, and to help newcomers and practitioners in computer graphics to quickly gain an overview of this vast field. Further, we would like to bring the mentioned research communities to even more interdisciplinary work, since the reconstruction problem itself is by far not solved. This paper provides a comprehensive overview of urban reconstruction. While there exists a considerable body of literature, this topic is still under active research. The work reviewed in this survey stems from the following three research communities: computer graphics, computer vision and photogrammetry and remote sensing. Our goal is to provide a survey that will help researchers to better position their own work in the context of existing solutions, and to help newcomers and practitioners in computer graphics to quickly gain an overview of this vast field. Further, we would like to bring the mentioned research communities to even more interdisciplinary work, since the reconstruction problem itself is by far not solved. © 2013 The Eurographics Association and John Wiley & Sons Ltd.

  19. Breast Reconstruction with Tissue Expansion

    Medline Plus

    Full Text Available RECONSTRUCTIVE BREAST SURGERY ALBANY MEDICAL CENTER HOSPITAL ALBANY, NY July 31, 2008 00:00:10 ANNOUNCER: Welcome to this OR-Live webcast presentation, brought to ... webcast screen and open the door to informed medical care. 00:00:28 DIMITRI KOUMANIS, M.D.: ...

  20. Tomographic reconstruction of polar plumes

    Science.gov (United States)

    Auchère, F.; Guennou, C.; Barbey, N.

    2012-06-01

    We present a tomographic reconstruction of polar plumes as observed in the Extreme Ultraviolet in January 2010. Plumes are elusive structures visible in polar coronal holes that may play an important role in the acceleration of the solar wind. However, despite numerous observations, little is irrefutably known about them. Because of line of sight effects, even their geometry is subject to debate. Are they genuine cylindrical features of the corona or are they only chance alignments along the line of sight? Tomography provides a means to reconstruct the volume of an optically thin object from a set of observations taken from different vantage points. In the case of the Sun, these are typically obtained by using a solar rotation worth of images, which limits the ability to reconstruct short lived structures. We present here a tomographic inversion of the solar corona obtained using only 6 days of data. This is achieved by using simultaneously three space telescopes (EUVI/STEREO and SWAP/PROBA2) in a very specific orbital configuration. The result is the shortest possible tomographic snapshot of polar plumes. The 3D reconstruction shows both quasi-cylindrical plumes and a network pattern that can mimic them by line of sight superimpositions. This suggests that the controversy on plume geometry is due to the coexistence of both types of structures.

  1. Stability indicators in network reconstruction.

    Science.gov (United States)

    Filosi, Michele; Visintainer, Roberto; Riccadonna, Samantha; Jurman, Giuseppe; Furlanello, Cesare

    2014-01-01

    The number of available algorithms to infer a biological network from a dataset of high-throughput measurements is overwhelming and keeps growing. However, evaluating their performance is unfeasible unless a 'gold standard' is available to measure how close the reconstructed network is to the ground truth. One measure of this is the stability of these predictions to data resampling approaches. We introduce NetSI, a family of Network Stability Indicators, to assess quantitatively the stability of a reconstructed network in terms of inference variability due to data subsampling. In order to evaluate network stability, the main NetSI methods use a global/local network metric in combination with a resampling (bootstrap or cross-validation) procedure. In addition, we provide two normalized variability scores over data resampling to measure edge weight stability and node degree stability, and then introduce a stability ranking for edges and nodes. A complete implementation of the NetSI indicators, including the Hamming-Ipsen-Mikhailov (HIM) network distance adopted in this paper is available with the R package nettools. We demonstrate the use of the NetSI family by measuring network stability on four datasets against alternative network reconstruction methods. First, the effect of sample size on stability of inferred networks is studied in a gold standard framework on yeast-like data from the Gene Net Weaver simulator. We also consider the impact of varying modularity on a set of structurally different networks (50 nodes, from 2 to 10 modules), and then of complex feature covariance structure, showing the different behaviours of standard reconstruction methods based on Pearson correlation, Maximum Information Coefficient (MIC) and False Discovery Rate (FDR) strategy. Finally, we demonstrate a strong combined effect of different reconstruction methods and phenotype subgroups on a hepatocellular carcinoma miRNA microarray dataset (240 subjects), and we validate the

  2. Stability indicators in network reconstruction.

    Directory of Open Access Journals (Sweden)

    Michele Filosi

    Full Text Available The number of available algorithms to infer a biological network from a dataset of high-throughput measurements is overwhelming and keeps growing. However, evaluating their performance is unfeasible unless a 'gold standard' is available to measure how close the reconstructed network is to the ground truth. One measure of this is the stability of these predictions to data resampling approaches. We introduce NetSI, a family of Network Stability Indicators, to assess quantitatively the stability of a reconstructed network in terms of inference variability due to data subsampling. In order to evaluate network stability, the main NetSI methods use a global/local network metric in combination with a resampling (bootstrap or cross-validation procedure. In addition, we provide two normalized variability scores over data resampling to measure edge weight stability and node degree stability, and then introduce a stability ranking for edges and nodes. A complete implementation of the NetSI indicators, including the Hamming-Ipsen-Mikhailov (HIM network distance adopted in this paper is available with the R package nettools. We demonstrate the use of the NetSI family by measuring network stability on four datasets against alternative network reconstruction methods. First, the effect of sample size on stability of inferred networks is studied in a gold standard framework on yeast-like data from the Gene Net Weaver simulator. We also consider the impact of varying modularity on a set of structurally different networks (50 nodes, from 2 to 10 modules, and then of complex feature covariance structure, showing the different behaviours of standard reconstruction methods based on Pearson correlation, Maximum Information Coefficient (MIC and False Discovery Rate (FDR strategy. Finally, we demonstrate a strong combined effect of different reconstruction methods and phenotype subgroups on a hepatocellular carcinoma miRNA microarray dataset (240 subjects, and we

  3. Ancestral reconstruction of tick lineages.

    Science.gov (United States)

    Mans, Ben J; de Castro, Minique H; Pienaar, Ronel; de Klerk, Daniel; Gaven, Philasande; Genu, Siyamcela; Latif, Abdalla A

    2016-06-01

    Ancestral reconstruction in its fullest sense aims to describe the complete evolutionary history of a lineage. This depends on accurate phylogenies and an understanding of the key characters of each parental lineage. An attempt is made to delineate our current knowledge with regard to the ancestral reconstruction of the tick (Ixodida) lineage. Tick characters may be assigned to Core of Life, Lineages of Life or Edges of Life phenomena depending on how far back these characters may be assigned in the evolutionary Tree of Life. These include housekeeping genes, sub-cellular systems, heme processing (Core of Life), development, moulting, appendages, nervous and organ systems, homeostasis, respiration (Lineages of Life), specific adaptations to a blood-feeding lifestyle, including the complexities of salivary gland secretions and tick-host interactions (Edges of Life). The phylogenetic relationships of lineages, their origins and importance in ancestral reconstruction are discussed. Uncertainties with respect to systematic relationships, ancestral reconstruction and the challenges faced in comparative transcriptomics (next-generation sequencing approaches) are highlighted. While almost 150 years of information regarding tick biology have been assembled, progress in recent years indicates that we are in the infancy of understanding tick evolution. Even so, broad reconstructions can be made with relation to biological features associated with various lineages. Conservation of characters shared with sister and parent lineages are evident, but appreciable differences are present in the tick lineage indicating modification with descent, as expected for Darwinian evolutionary theory. Many of these differences can be related to the hematophagous lifestyle of ticks. PMID:26868413

  4. Reconstructing the inflaton potential: Perturbative reconstruction to second order

    Energy Technology Data Exchange (ETDEWEB)

    Copeland, Edmund J.; Kolb, Edward W.; Liddle, Andrew R.; Lidsey, James E.

    1993-08-01

    One method to reconstruct the scalar field potential of inflation is a perturbative approach, where the values of the potential and its derivatives are calculated as an expansion in departures from the slow-roll approximation. They can then be expressed in terms of observable quantities, such as the square of the ratio of the gravitational wave amplitude to the density perturbation amplitude, the deviation of the spectral index from the Harrison--Zel'dovich value, etc. Here, we calculate complete expressions for the second-order contributions to the coefficients of the expansion by including for the first time corrections to the standard expressions for the perturbation spectra. As well as offering an improved result, these corrections indicate the expected accuracy of the reconstruction. Typically the corrections are only a few percent.

  5. Current Trends in Anterior Cruciate Ligament Reconstruction

    OpenAIRE

    Kim, Ha Sung; Seon, Jong Keun; Jo, Ah Reum

    2013-01-01

    The advances in the knowledge of anatomy, surgical techniques, and fixation devices have led to the improvement of anterior cruciate ligament (ACL) reconstruction over the past 10 years. Nowadays, double bundle and anatomical single bundle ACL reconstruction that more closely restores the normal anatomy of the ACL are becoming popular. Although there is still no definite conclusion whether double bundle ACL reconstruction provides better clinical results than single bundle reconstruction, the...

  6. 3D Reconstruction Technique for Tomographic PIV

    Institute of Scientific and Technical Information of China (English)

    姜楠; 包全; 杨绍琼

    2015-01-01

    Tomographic particle image velocimetry(Tomo-PIV) is a state-of-the-art experimental technique based on a method of optical tomography to achieve the three-dimensional(3D) reconstruction for three-dimensional three-component(3D-3C) flow velocity measurements. 3D reconstruction for Tomo-PIV is carried out herein. Meanwhile, a 3D simplified tomographic reconstruction model reduced from a 3D volume light inten-sity field with 2D projection images into a 2D Tomo-slice plane with 1D projecting lines, i.e., simplifying this 3D reconstruction into a problem of 2D Tomo-slice plane reconstruction, is applied thereafter. Two kinds of the most well-known algebraic reconstruction techniques, algebraic reconstruction technique(ART) and multiple algebraic reconstruction technique(MART), are compared as well. The principles of the two reconstruction algorithms are discussed in detail, which has been performed by a series of simulation images, yielding the corresponding recon-struction images that show different features between the ART and MART algorithm, and then their advantages and disadvantages are discussed. Further discussions are made for the standard particle image reconstruction when the background noise of the pre-initial particle image has been removed. Results show that the particle image recon-struction has been greatly improved. The MART algorithm is much better than the ART. Furthermore, the computa-tional analyses of two parameters(the particle density and the number of cameras), are performed to study their effects on the reconstruction. Lastly, the 3D volume particle field is reconstructed by using the improved algorithm based on the simplified 3D tomographic reconstruction model, which proves that the algorithm simplification is feasible and it can be applied to the reconstruction of 3D volume particle field in a Tomo-PIV system.

  7. Multi-resolution Compressive Sensing Reconstruction

    OpenAIRE

    Gonzalez, Adriana; Jiang, Hong; Huang, Gang; Jacques, Laurent

    2016-01-01

    We consider the problem of reconstructing an image from compressive measurements using a multi-resolution grid. In this context, the reconstructed image is divided into multiple regions, each one with a different resolution. This problem arises in situations where the image to reconstruct contains a certain region of interest (RoI) that is more important than the rest. Through a theoretical analysis and simulation experiments we show that the multi-resolution reconstruction provides a higher ...

  8. Correlação entre os índices dopplervelocimétricos da veia cava inferior e ducto venoso e a concentração de hemoglobina do cordão em fetos de gestantes isoimunizadas

    Directory of Open Access Journals (Sweden)

    Taveira Marcos Roberto

    2003-01-01

    Full Text Available OBJETIVO: o objetivo principal desse estudo foi verificar se existe correlação entre os índices dopplervelocimétricos da veia cava inferior e do ducto venoso e a concentração sérica da hemoglobina fetal. MÉTODOS: estudo transversal e prospectivo, realizado entre janeiro de 1998 e junho de 2001. Foram acompanhadas 31 gestantes isoimunizadas com resultado do teste de Coombs indireto maior que 1:8, que foram submetidas à pesquisa de hemólise fetal. Quando foram indicadas as transfusões intra-uterinas intravasculares, a hemoglobina do cordão foi dosada no início do procedimento. Nos demais casos, a hemoglobina do cordão foi mensurada no momento do parto, sempre por cesariana eletiva. Obteve-se um total de 74 procedimentos estudados, definidos como sendo cada transfusão intra-uterina precedida pela dopplervelocimetria venosa. A mensuração da concentração da hemoglobina fetal foi realizada no Hemocue® (B-Hemoglobin Photometer Hemocue AB; Angelholm, Sweden, dispositivo usado para a determinação quantitativa de hemoglobina no sangue. A dopplervelocimetria da cava inferior e do ducto venoso foi realizada antecedendo a coleta do sangue fetal, sempre em intervalo de tempo inferior a 24 horas. Os índices dopplervelocimétricos estudados foram o índice de pulsatilidade para veias (IPV, o índice do pico de velocidade para veias (IPVV e a relação entre o pico de velocidade durante a fase de contração atrial e o pico de velocidade na sístole ventricular (relação CA/SV ou índice de pré-carga, na veia cava inferior, e o IPV, IPVV e a relação entre os picos de velocidade da sístole ventricular e da contração atrial (relação SV/CA, no ducto venoso. Foi realizado estudo de correlação entre a dopplervelocimetria da veia cava inferior e do ducto venoso e a hemoglobina do cordão, pela técnica de regressão linear simples. Realizou-se também estudo de associação entre os índices dopplervelocimétricos do compartimento

  9. Reconstructing Deweyan Pragmatism: A Review Essay

    Science.gov (United States)

    Neubert, Stefan

    2009-01-01

    In this essay Stefan Neubert argues that John Dewey was a philosopher of reconstruction and that the best use we can make of him today is to reconstruct his work in and for our own contexts. Neubert distinguishes three necessary and equally important components of the overall project of reconstructing Deweyan pragmatism: first, to make strong and…

  10. Set-reconstructibility of Post classes

    OpenAIRE

    Couceiro, Miguel; Lehtonen, Erkko; Schölzel, Karsten

    2013-01-01

    The clones of Boolean functions are classified in regard to set-reconstructibility via a strong dichotomy result: the clones containing only affine functions, conjunctions, disjunctions or constant functions are set-reconstructible, whereas the remaing clones are not weakly reconstructible.

  11. Retrievable stent filter placement for the treatment of budd-chiari syndrome complicated with inferior vena cava thrombosis: its mid-term results

    International Nuclear Information System (INIS)

    Objective: To investigate the mid-term efficacy of retrievable stent filter placement for the treatment of Budd-Chiari syndrome (BCS) complicated with inferior vena cava (IVC) thrombosis. Methods: Eight patients of BCS complicated with IVC thrombosis were enrolled in this study. IVC thrombosis included segmental occlusion (n = 2) and membranous occlusion (n = 6). In all patients, the IVC was re-canalized by using blunt wire after anticoagulation and thrombolytic therapy, then, the re-canalized site was expanded with small balloon, which was followed by the placement of retrievable stent filter, and, finally, IVC size was dilated with larger balloon. Anticoagulation and thrombolytic therapy was given after the procedure. And all the retrievable stent filters were withdrawn from the IVC through internal jugular vein when the thrombus in IVC was dissolved. In patients with segmental occlusion of IVC, in addition to the placement of retrievable stent filter a 'Z' type vessel stent was also placed during the same interventional session. Follow-up examination with color Doppler sonography was conducted in all patients. Results: Technical success was achieved in all 8 patients without pulmonary infarction or other complications both during and after the operation. Immediately after the thrombus completely disappeared, the retrievable stent filter was successfully taken out in all patients. During a following-up period of 3-12 months, color Doppler sonographs showed that the IVC remained patent in 6 patients and had a recurrence of stenosis in 2 patients. Conclusion: Placement of retrievable stent filter is a safe and effective treatment for BCS complicated with IVC thrombosis. (authors)

  12. Creation of an iOS and Android Mobile Application for Inferior Vena Cava (IVC) Filters: A Powerful Tool to Optimize Care of Patients with IVC Filters.

    Science.gov (United States)

    Deso, Steven E; Idakoji, Ibrahim A; Muelly, Michael C; Kuo, William T

    2016-06-01

    Owing to a myriad of inferior vena cava (IVC) filter types and their potential complications, rapid and correct identification may be challenging when encountered on routine imaging. The authors aimed to develop an interactive mobile application that allows recognition of all IVC filters and related complications, to optimize the care of patients with indwelling IVC filters. The FDA Premarket Notification Database was queried from 1980 to 2014 to identify all IVC filter types in the United States. An electronic search was then performed on MEDLINE and the FDA MAUDE database to identify all reported complications associated with each device. High-resolution photos were taken of each filter type and corresponding computed tomographic and fluoroscopic images were obtained from an institutional review board-approved IVC filter registry. A wireframe and storyboard were created, and software was developed using HTML5/CSS compliant code. The software was deployed using PhoneGap (Adobe, San Jose, CA), and the prototype was tested and refined. Twenty-three IVC filter types were identified for inclusion. Safety data from FDA MAUDE and 72 relevant peer-reviewed studies were acquired, and complication rates for each filter type were highlighted in the application. Digital photos, fluoroscopic images, and CT DICOM files were seamlessly incorporated. All data were succinctly organized electronically, and the software was successfully deployed into Android (Google, Mountain View, CA) and iOS (Apple, Cupertino, CA) platforms. A powerful electronic mobile application was successfully created to allow rapid identification of all IVC filter types and related complications. This application may be used to optimize the care of patients with IVC filters. PMID:27247483

  13. Produção de serapilheira em um fragmento adjacente a uma cava de mineração, Ribeirão Grande, SP

    Directory of Open Access Journals (Sweden)

    Leandro S. Nascimento

    2015-09-01

    Full Text Available RESUMORealizou-se este estudo com o objetivo de avaliar a produção de serapilheira em um fragmento florestal adjacente a uma cava de mineração de calcário, Ribeirão Grande (SP. O material foi coletado mensalmente entre os meses de fevereiro de 2011 a janeiro de 2012. Foram utilizados 14 coletores de madeira (0,25 x 0,25 m, suspensos 20 cm acima da superfície do solo. Em laboratório o material interceptado nos coletores foi triado nas frações: folhas, caules, flores, frutos e sementes, ramos com até 2 cm de diâmetro e restos (material fecal, insetos e plântulas, secado em estufa a 70 °C e pesado em balança analítica. A produção anual média de serapilheira para a área foi de 2809,02 g m-2. Dentre as frações da serapilheira a que mais contribuiu para a produção total foi a fração folhas representando 73,86% do peso seco total (2074,74 g m-2, seguida da fração ramos, com 18,89% da serapilheira total (530,67 g m-2, frutos e sementes 3,39% (95,18 g m-2, restos 2,65% (74,48 g m-2 e flores com 1,21% (33,95 g m-2. Pelos resultados obtidos não há evidências de que a presença da mina esteja interferindo na produção de serapilheira haja vista que os dados alcançados se assemelham aos de outros trabalhos já publicados sobre o tema.

  14. In Vivo Evaluation of the Effects of Gravitational Force (+Gz) on Over-the-Wire Stainless Steel Greenfield Inferior VenaCava Filter in Swine

    International Nuclear Information System (INIS)

    This study was done to determine the effect of exposure to gravitational force (acceleration stress) on invivo over-the-wire stainless steel Greenfield inferior vena cavafilters. Fifteen pigs underwent venous cut down and placement of a stainless steel Greenfield filter. A 4-week observation period simulated realistic convalescence and allowed sufficient time for epithelialization. Ten pigs were exposed to acceleration stress in a centrifuge (3G run for 15 sec followed by rest until return to baseline heart rate, then a 9G run for 15 sec), with inertial loading in ahead-to-tail direction (+Gz). Fluoroscopy during acceleration stress allowed assessment for filter migration. Five pigs were not exposed to acceleration stress. AP and lateral abdominal radiographs were obtained at post-filter placement, convalescence, and centrifuge exposure to determine the position and integrity of the filter. All 15 IVCs were resected and evaluated for gross or histological injury to the vessel wall. IVC filter placement was technically successful in all 15 pigs.Radiographic measurements were limited secondary to differences in pig positioning. Fluoroscopy showed no filter migration. All filters were securely attached to the vena cava by the hooks without gross evidence of perforation or hemorrhage. There were varying degrees of fibroplasia involving the hooks and tip of the filters in both the control and experimental groups. Histologically, there was evidence of prior hemorrhage at the level of the hooks, which was similar between the control and experimental groups. It is concluded that Greenfield filter position and vena caval integrity at the implantation site is unaffected by high acceleration stress

  15. Mandibular reconstruction using bone allografts

    International Nuclear Information System (INIS)

    Further understanding of bone healing mechanisms, bone physiology and bone biology, transplantation immunology, and development of Tissue Banking procedures has enabled oral and maxillofacial surgeons to reconstruct even the most difficult bony defects successfully with the preserved allogeneic bone implant. Although it had been known that bone allografts were clinically effective, its application has not been widespread until the reports of Inclan (I 942), Hyatt and Butler (I 950), and Wilson (I 95 1). Tissue Banking provides the surgeon with a readily available, relatively inexpensive, and relatively safe selection of allogeneic bone for clinical use. Now autogenous bone and allogeneic bone implants present a wide variety of surgical options to surgeons, whether used separately or in combination. The surgeons are able to make judicious and fruitful choices, only with a thorough knowledge of the above-mentioned biological principles and skillful techniques. Many kinds of bone grafting techniques have been tried for reconstructing defective osseous tissues of the oral and maxillofacial region, though they have varying degrees of success. The osseous defects which require grafting include those of various size, shape, position, or amount. Unlike autogenous grafts, whose function is to provide osteogenic cells, allografts are purely passive, offering only a matrix for the inductive phase of bone healing. The condition of the recipient bed is of primary importance, because the host must produce all of the essential elements for the bone allograft to become incorporated. Depending on the processing methods of the allogeneic bone, the bone graft materials have different qualities, different healing potentials and different indications. Proper selection of grafts and surgical techniques requires an understanding of graft immunology and the mechanisms of graft healing. The surgeons should know about the biological principles to raise the clinical success rate

  16. Monocultivo de eucalipto e consórcio com sesbânia: crescimento inicial em cavas de extração de argila Eucalyptus monocropping and intercropped with sesbania: initial growth in clay mining diggings

    Directory of Open Access Journals (Sweden)

    Anderson Ribeiro Santiago

    2009-02-01

    Full Text Available O consórcio de eucalipto com sesbânia na reabilitação de cavas de extração de argila pode representar uma forma de uso com benefícios ecológicos e econômicos, tendo em vista a sub-utilização a que essas cavas estão sendo submetidas. Este trabalho teve por objetivo avaliar a sobrevivência, o crescimento inicial e características fisiológicas de Eucalyptus camaldulensis, E. tereticornis, E. robusta e E. pellita, em monocultivos e plantios consorciados com Sesbania virgata. Foram instalados dois experimentos (monocultivo e plantio consorciado, numa cava de extração de argila, segundo o delineamento em blocos casualizados com quatro repetições. Os plantios consorciados favoreceram a sobrevivência das espécies. Os eucaliptos no monocultivo apresentaram maior crescimento inicial em diâmetro do colo e em área de copa. As espécies de eucalipto responderam aos efeitos do consórcio e das podas ao longo do tempo, exceto E. tereticornis.Intercropping of Eucalyptus and sesbania for the recovery of clay mining diggings can represent ecological and economic benefits. This work aimed to evaluate survival, initial growth and physiological characteristics of Eucalyptus camaldulensis, E. tereticornis, E. robusta and E. pellita, monocropped and intercropped with Sesbania virgata. Two experiments (monocropping and intercropped were set up in a clay mining digging, arranged in a randomized block design with 4 replicates. Intercropping favored the survival of the species. Eucalyptus monocropping presented a greater initial growth in soil level diameter and canopy area. The eucalyptus species responded to the effects of intercropping and pruning, along time, except for E. tereticornis.

  17. Atmospheric muons reconstruction with Antares

    International Nuclear Information System (INIS)

    The ANTARES collaboration is building a neutrino telescope in the Mediterranean Sea. This detector contains 900 photomultiplier tubes, dispatched on 12 lines, in order to detect Cerenkov light from muon induced by neutrino interactions in the the vicinity of the detector. Currently the first 5 lines have been deployed. A first task consists in studying the stability of the detector calibration, which is a necessary step to understand the detector response. Then we studied optical properties of water, for this we developed a reconstruction method dedicated to LED Beacon. The extracted parameters are compatible with earlier measurements. A quality criteria to reject badly reconstructed track has been developed based on the likelihood of the tracks fit versus point fit. This has been applied to real data and a preliminary analysis of atmospheric muons with a 5-lines detector is performed. (author)

  18. Optimal Reconstruction of Inviscid Vortices

    CERN Document Server

    Danaila, Ionut

    2014-01-01

    This study addresses the question whether, given {some} measurements of the velocity field induced by a vortex, one can stably determine the structure of the vortex. Assuming that the flow is incompressible, inviscid and stationary in the frame of reference moving with the vortex, the "structure" of the vortex is uniquely characterized by the functional relation between the streamfunction and vorticity. It is demonstrated how the inverse problem of reconstructing this functional relation from data can be framed as an optimization problem which can be efficiently solved using variational techniques. To focus attention, we consider 3D axisymmetric vortex rings and use measurements of the tangential velocity on the boundary of the vortex bubble. In contrast to earlier studies, the vorticity function defining the streamfunction-vorticity relation is reconstructed in the continuous setting subject to a minimum number of assumptions. To validate our approach, two test cases are presented, involving Hill's and Norbu...

  19. The Algebraic Reconstruction Technique (ART)

    International Nuclear Information System (INIS)

    Projections of charged particle beam current density (profiles) are frequently used as a measure of beam position and size. In conventional practice only two projections, usually horizontal and vertical, are measured. This puts a severe limit on the detail of information that can be achieved. A third projection provides a significant improvement. The Algebraic Reconstruction Technique (ART) uses three or more projections to reconstruct 3-dimensional density profiles. At the 200 MeV H-linac, we have used this technique to measure beam density, and it has proved very helpful, especially in helping determine if there is any coupling present in x-y phase space. We will present examples of measurements of current densities using this technique

  20. Reconstruction of complete interval tournaments

    CERN Document Server

    Iványi, Antal

    2010-01-01

    Let $a, b$ and $n$ be nonnegative integers $(b \\geq a, \\ b > 0, \\ n \\geq 1)$, $\\mathcal{G}_n(a,b)$ be a multigraph on $n$ vertices in which any pair of vertices is connected with at least $a$ and at most $b$ edges and \\textbf{v =} $(v_1, v_2, ..., v_n)$ be a vector containing $n$ nonnegative integers. We give a necessary and sufficient condition for the existence of such orientation of the edges of $\\mathcal{G}_n(a,b)$, that the resulted out-degree vector equals to \\textbf{v}. We describe a reconstruction algorithm. In worst case checking of \\textbf{v} requires $\\Theta(n)$ time and the reconstruction algorithm works in $O(bn^3)$ time. Theorems of H. G. Landau (1953) and J. W. Moon (1963) on the score sequences of tournaments are special cases $b = a = 1$ resp. $b = a \\geq 1$ of our result.