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https://www.readbyqxmd.com/read/28429637/analysis-of-rotation-angles-and-motions-of-the-flexible-mechanisms-in-bifurcated-blood-vessels
#1
Bin He, Shoulin Xu, An Ding, Yanmin Zhou
This article investigates the relationship of rotation angle of two ends of elastic guidewires, and motion method of guidewires and catheters in bifurcated blood vessels. The relationship of rotation angles of the two ends of the guidewire has first been studied by mathematical reasoning, indicating that the rotation angle of the front end of guidewire can be precisely described by that of the rear end. In order to satisfy the requirements of different vascular interventional surgeries, we further investigated a general model of bifurcated human blood vessels...
April 1, 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28427741/management-of-biliary-anastomotic-strictures-after-liver-transplantation
#2
REVIEW
Aydin Seref Koksal, Ahmet Tarik Eminler, Erkan Parlak, Ahmet Gurakar
Biliary strictures constitute 40% to 60% of the biliary complications after liver transplantation. They are more common after living donor related liver transplantation (LDLT) than orthotopic liver transplantation (OLT). Balloon dilation followed by multiple plastic stent insertion leads to a mean resolution rate of 84% in the treatment of ASs after OLT. Endoscopic treatment of ASs after LDLT is more difficult because of the small size of the ASs, their multiple number and peripheral location. Balloon dilation followed by multiple plastic stent insertion had a mean resolution rate of 53%...
March 30, 2017: Transplantation Reviews
https://www.readbyqxmd.com/read/28427597/intentional-percutaneous-laceration-of%C3%A2-the%C3%A2-anterior-mitral-leaflet-to-prevent%C3%A2-outflow%C3%A2-obstruction-during-transcatheter-mitral-valve-replacement-first-in-human%C3%A2-experience
#3
Vasilis C Babaliaros, Adam B Greenbaum, Jaffar M Khan, Toby Rogers, Dee Dee Wang, Marvin H Eng, William W O'Neill, Gaetano Paone, Vinod H Thourani, Stamatios Lerakis, Dennis W Kim, Marcus Y Chen, Robert J Lederman
OBJECTIVES: This study sought to use a new catheter technique to split the anterior mitral valve leaflet (AML) and prevent iatrogenic left ventricular outflow tract (LVOT) obstruction immediately before transcatheter mitral valve replacement (TMVR). BACKGROUND: LVOT obstruction is a life-threatening complication of TMVR, caused by septal displacement of the AML. METHODS: The procedure was used in patients with severe mitral valve disease and prohibitive surgical risk...
April 24, 2017: JACC. Cardiovascular Interventions
https://www.readbyqxmd.com/read/28403110/a-feasibility-study-of-digital-single-operator-cholangioscopy-for-diagnostic-and-therapeutic-procedure-with-videos
#4
Miyuki Imanishi, Takeshi Ogura, Yoshitaka Kurisu, Saori Onda, Wataru Takagi, Atsushi Okuda, Akira Miyano, Mio Amano, Nobu Nishioka, Daisuke Masuda, Kazuhide Higuchi
Recently, the novel SpyGlass DS Direct Visualization system (SPY DS) has become available. This system offers several advantages over the conventional SPYGlass system. This study evaluated the clinical feasibility and efficacy of diagnostic and therapeutic procedures for biliary disorder using SPY DS.In this retrospective study, consecutive patients who had biliary disorder were enrolled between November 2015 and February 2016. All patients could not be diagnosed or treated by standard endoscopic retrograde cholangiopancreatography in our hospital or at another hospital...
April 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28395416/-application-of-percutaneous-angiojet-thrombectomy-in-patients-with-acute-symptomatic-portal-and-superior-mesenteric-venous-thrombosis
#5
J H Song, X He, W S Lou, L Chen, G P Chen, H B Su, W Y Shi, T Wang, B X Zhao, J P Gu
Objective: To evaluate the clinical value of percutaneous AngioJet thrombectomy in treatment of acute symptomatic portal and superior mesenteric venous thrombosis venous thrombosis (PVMVT) . Method: From January 2014 to January 2016, a total of 8 patients in Nanjing First Hospital with PVMVT verified by color Doppler ultrasound and computed tomographic angiography (CTA) were analyzed retrospectively. Under ultrasound guidance , the branch of the right portal vein(PV) was punctured with a micropuncture set and a 4-F infusion catheter was advanced to the superior mesenteric vein(SMV)...
April 4, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/28394783/cardiac-computed-tomography-for-planning-revascularization-procedures
#6
Maksymilian P Opolski
Coronary computed tomography angiography (coronary CTA) is being increasingly used to detect and rule out coronary artery stenoses. Beyond stenosis detection, the abundance of anatomic, morphologic, and physiological information incorporated from a single one-stop-shop CT study has generated considerable interest in the context of preprocedural planning for coronary revascularization. Specifically, preprocedural CTA data sets can assist interventional cardiologists with selective catheter placement, appropriate guidewire choice, accurate stent size selection, and, most importantly, development of a stepwise revascularization strategy plan...
April 7, 2017: Journal of Thoracic Imaging
https://www.readbyqxmd.com/read/28394757/a-novel-interventional-method-for-treating-femoral-pseudoaneurysms-results-from-a-monocentric-experience
#7
Karim Ibrahim, Marian Christoph, Carsten Wunderlich, Stephanie Jellinghaus, Tobias Loehn, Akram Youssef, Lisa Schoener, Silvio Quick, Johannes Mierke, Ruth H Strasser, Christian Pfluecke
AIMS: Iatrogenic pseudoaneurysms of the femoral artery lead to increased morbidity and mortality, especially when surgical treatment is necessary. Manual compression and thrombin injection are commonly used to occlude the pseudoaneurysms. However, in some cases these treatment options are inapplicable or unsuccessful. We introduce a novel technique to interventionally close pseudoaneurysms. METHODS AND RESULTS: Between January 2014 and May 2016, a total of eight iatrogenic pseudoaneurysms of the femoral artery were treated by interventional closure technique after at least one ineffective attempt of manual compression...
April 11, 2017: EuroIntervention
https://www.readbyqxmd.com/read/28393299/blood-flow-induced-physically-based-guidewire-simulation-for-vascular-intervention-training
#8
Jiayin Cai, Hongzhi Xie, Shuyang Zhang, Lixu Gu
PURPOSE: A realistic guidewire behavior simulation is a vital component of a virtual vascular intervention system. Such systems are a safe, low-cost means of establishing a training environment to help inexperienced surgeons develop their intervention skills. Previous attempts to simulate the complex movement of a guidewire inside blood vessels have rarely considered the influence of blood flow. In this paper, we address this problem by integrating blood flow analysis and propose a novel guidewire simulation model...
April 9, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28391062/robust-guidewire-tracking-under-large-deformations-combining-segment-like-features-seglets
#9
Alessandro Vandini, Ben Glocker, Mohamad Hamady, Guang-Zhong Yang
Robust tracking of interventional tools, such as guidewires and catheters, in X-ray fluoroscopic video sequences has a wide range of clinical applications for endovascular procedures. Thus far, the tracking is usually achieved by finding the optimal displacement of the control points of a spline, which models the guidewire, between consecutive frames. The displacement of the control points is typically driven by a data term and smoothed by a regularization term. In the presence of large deformation and changes in length of the tool, the current tracking methods may fail to recover the guidewire motion...
March 15, 2017: Medical Image Analysis
https://www.readbyqxmd.com/read/28389507/coronary-computed-tomography-angiography-predicts-guidewire-crossing-and-success-of-percutaneous-intervention-for-chronic-total-occlusion-korean-multicenter-cto-ct-registry-score-as-a-tool-for-assessing-difficulty-in-chronic-total-occlusion-percutaneous-coronary
#10
Cheol-Woong Yu, Hyun-Jong Lee, Jon Suh, Nae-Hee Lee, Sang-Min Park, Taek Kyu Park, Jeong Hoon Yang, Young Bin Song, Joo-Yong Hahn, Seung Hyuk Choi, Hyeon-Cheol Gwon, Sang-Hoon Lee, Yeon Hyeon Choe, Sung Mok Kim, Jin-Ho Choi
BACKGROUND: We developed a model that predicts difficulty of percutaneous coronary intervention for coronary chronic total occlusion (CTO) using coronary computed tomographic angiography. METHODS AND RESULTS: A total of 684 CTO lesions with preprocedural computed tomographic angiography were enrolled from 4 centers. Data were randomly divided into derivation and validation datasets at 2:1 ratio. The end point was successful guidewire crossing ≤30 minutes, which was met in 50%...
April 2017: Circulation. Cardiovascular Imaging
https://www.readbyqxmd.com/read/28381323/flexible-microsensor-technology-for-real-time-navigation-tracking-in-balloon-sinus-ostial-dilation
#11
Kent Lam, Jo-Lawrence Bigcas, Amber Luong, William Yao, Martin J Citardi
BACKGROUND: Microsensor navigation has the potential to aid balloon sinus ostial dilation by providing real-time tracking of balloon devices within the complex anatomy of the sinonasal cavities. OBJECTIVE: This feasibility study evaluated the incorporation of a new microsensor technology into a flexible guidewire for use with current instruments in balloon sinus ostial dilation. METHODS: A retrospective study was conducted to include seven men and one woman (age range, 33-68 years), who underwent balloon sinus ostial dilation with flexible microsensor navigation in the operating room setting...
March 1, 2017: Allergy & Rhinology
https://www.readbyqxmd.com/read/28379670/alternative-approach-of-a-fibroepithelial-polyp
#12
Cristiano Linck Pazeto, Willy Baccaglini, Thiago Fernandes Negris Lima, Alexandre Gomes S Simões, Sidney Glina
A 41-year-old male presented at Emergency Department (ED) with right flank pain associated with hematuria for 3 days. Patient had a previous history of nephrolithiasis. The physical examination and blood tests were normal. Urine analyses showed haematuria > 1.000.000/μL. After clinical evaluation, a computer tomography (CT) showed right ureteral dilata¬tion caused by a 5 mm proximal stone and a distal intraluminal mass of 8 cm in length. In this setting, an ureteroscopic biopsy was performed and revealed a large polypoid lesion histologically suggestive of fibroepithelial polyp...
April 6, 2017: International Braz J Urol: Official Journal of the Brazilian Society of Urology
https://www.readbyqxmd.com/read/28379041/the-double-bend-guidewire-technique-in-intramedullary-nailing
#13
A Vris, K R Vaghela, N Heidari
No abstract text is available yet for this article.
April 5, 2017: Annals of the Royal College of Surgeons of England
https://www.readbyqxmd.com/read/28366062/initial-experience-with-a-multiple-parallel-guidewire-support-system-for-complex-tortuous-aortic-arch-navigation-and-great-vessel-catheterization-technical-note
#14
Leonardo Rangel-Castilla, Hakeem J Shakir, Adnan H Siddiqui
The ability to traverse an anatomically challenging and complex arch is paramount to the success of any neuroendovascular procedure. With age, the aortic arch becomes elongated, calcified, and less compliant. The authors present the initial experience with a multiple parallel guidewire system (ZigiWire Mode 3) for catheterization through a complex tortuous aortic arch to access extracranial vessels. The ZigiWire is an organized guidewire system that uses consecutive delivery of 3 small-diameter (0.014-inch) guidewires that are progressively advanced in parallel to secure support-wire access...
April 2017: Neurosurgical Focus
https://www.readbyqxmd.com/read/28360977/endoscopic-retrograde-cholangiopancretography-in-modified-double-tracks-anastomosis-with-anastomotic-stenosis
#15
Xiao-Song Wang, Fei Wang, Quan-Peng Li, Lin Miao, Xiu-Hua Zhang
A 63-year-old man presented at our hospital with right upper abdomen pain and fever for 4 d. The patient's magnetic resonance cholangiopancreatography revealed dilated common bile duct and choledocholithiasis. In his past history, he received proximal gastrectomy and modified double tracks anastomosis. Endoscopic retrograde cholangiopancretography in modified double tracks anastomosis, especially accompanied with anastomotic stenosis, has been rarely reported. In the present case, the duodenoscope was successfully introduced over the guidewire and the stone taken out using a basket...
March 16, 2017: World Journal of Gastrointestinal Endoscopy
https://www.readbyqxmd.com/read/28349613/prospective-evaluation-of-digital-single-operator-cholangioscope-for-diagnostic-and-therapeutic-procedures-with-videos
#16
Takeshi Ogura, Miyuki Imanishi, Kurisu Yoshitaka, Saori Onda, Tastsushi Sano, Wataru Takagi, Atsushi Okuda, Akira Miyano, Mio Amano, Nobu Nishioka, Tadahiro Yamada, Daisuke Masuda, Mamoru Takenaka, Masayuki Kitano, Kazuhide Higuchi
OBJECTIVES: Recently, the digital single-operator cholangioscope (DSOCS) has become available. This system may allow diagnosis by direct visualization and allow performance of various therapeutic procedures. The aim of this study was to prospectively evaluate the clinical utility of the DSOCS for diagnostic and therapeutic procedures for biliary disease. METHODS: Technical success was defined as successful visualization of target lesions in the biliary tract and performing forceps biopsy as a diagnostic procedure, and successfully performing treatment such as guidewire insertion for the area of interest, electrohydraulic lithotripsy (EHL), or migrated stent removal...
March 28, 2017: Digestive Endoscopy: Official Journal of the Japan Gastroenterological Endoscopy Society
https://www.readbyqxmd.com/read/28347605/a-single-center-retrospective-analysis-of-patency-rates-of-intraluminal-versus-subintimal-endovascular-revascularization-of-long-femoropopliteal-occlusions
#17
Anvar Babaev, Pawan Hari, Rohit Gokhale, Susanna Zavlunova
OBJECTIVE: The evaluation of patency rates of intraluminal versus subintimal endovascular revascularization of long femoropopliteal (FP) lesions. BACKGROUND: Chronic total occlusions (CTO) of the FP artery in peripheral interventions are crossed either with a support catheter-guidewire based technique or subintimal dissection and re-entry device assisted approach. Both techniques have a high procedural success rate, but their long term patency is not well studied...
March 20, 2017: Cardiovascular Revascularization Medicine: Including Molecular Interventions
https://www.readbyqxmd.com/read/28341978/antegrade-thoracic-endovascular-aortic-repair-using-an-ascending-aortofemoral-through-and-through-wire-technique-for-a-severely-tortuous-aorta-associated-with-rickets
#18
Atsushi Morishita, Kazuhiko Hanzawa, Seiichiro Katahira, Takeshi Hoshino, Hideyuki Tomioka
BACKGROUND: Severe aortic tortuosity of the access route often prevents successful complete exclusion of an aneurysm in thoracic endovascular aortic repair (TEVAR). CASE PRESENTATION: We performed antegrade TEVAR on a 79-year-old man with right hemiparesis. We deployed the stent graft from the ascending aorta with a tube graft conduit to treat a descending thoracic aortic aneurysm associated with rickets and multiple comorbidities. Although the application of a ministernotomy diminished the potential advantages of endovascular treatment in view of less invasive surgery, antegrade TEVAR using an ascending aortofemoral through-and-through wire technique was a good option in this patient because a conventional retrograde approach was not feasible due to his severely tortuous aorta...
December 2017: Surgical Case Reports
https://www.readbyqxmd.com/read/28341575/the-use-of-a-colapinto-tips-needle-under-cone-beam-computed-tomography-guidance-for-true-lumen-re-entry-in-subintimal-recanalization-of-chronic-iliac-artery-occlusion
#19
Huei-Lung Liang, Ming-Feng Li, Chia-Ling Chiang, Matt Chiung-Yu Chen, Chieh-Jen Wu, Huay-Ben Pan
BACKGROUND: To report the technique and clinical outcome of subintimal re-entry in chronic iliac artery occlusion by using a Colapinto transjugular intrahepatic portosystemic shunt (TIPS) needle under rotational angiography (cone-beam computed tomography; CT) imaging guidance. METHODS: Patients with chronic iliac artery occlusion with earlier failed attempts at conventional percutaneous recanalization during the past 5 years were enrolled in our study. In these patients, an ipsilateral femoral access route was routinely utilized in a retrograde fashion...
March 21, 2017: Journal of the Chinese Medical Association: JCMA
https://www.readbyqxmd.com/read/28337283/intracoronary-hypothermia-for-acute-myocardial-infarction-in-the-isolated-beating-pig-heart
#20
Luuk C Otterspoor, Lokien X van Nunen, Tilaï T Rosalina, Marcel Van't Veer, Sjoerd Van Tuijl, Marco Stijnen, Marcel Cm Rutten, Frans N van de Vosse, Nico Hj Pijls
Hypothermia may attenuate reperfusion injury and thereby improve acute myocardial infarction therapy. Systemic cooling trials failed to reduce infarct size, perhaps because the target temperature was not reached fast enough. The use of selective intracoronary hypothermia combined with intracoronary temperature monitoring allows for titrating to target temperature and optimizing the cooling rate. We aimed to the test the feasibility of intracoronary cooling for controlled, selective myocardial hypothermia in an isolated beating pig heart...
2017: American Journal of Translational Research
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