Search Results
Results 301 - 350 of 2172
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Lee Youn Joo - - 2013
There are very few reports assessing in-stent restenosis (ISR) after vertebral artery ostium (VAO) stents using multidetector computed tomography (MDCT). To compare the diagnostic accuracy of computed tomography angiography (CTA) using 64-slice MDCT with digital subtraction angiography (DSA) for detection of significant ISR after VAO stenting. The study evaluated 57 ...
Paryab Nasim - - 2013
Helical polymeric stents have been proposed as a suitable geometry for biodegradable drug-eluting polymer-based stents. However, helical stents often experience nonuniform local expansion (dog boning), which can prohibit full stent expansion using conventional methods. The development of stents and deployment methods is challenging and can be supported by numerical analysis; ...
Yoshioka Hideyuki - - 2013
Neck clipping of a large middle cerebral artery aneurysm was performed using a newly developed surgical microscope integrated with modules for both indocyanine green (ICG) and fluorescein videoangiography. During surgery, ICG and fluorescein videoangiography by intra-arterial or intravenous injection were safely carried out without interrupting the surgical procedure. Based on ...
Condino S - - 2013
The purpose of this in vitro study was to clinically assess the feasibility of a three-dimensional (3D) electromagnetic (EM) navigator, including sensorized catheters and guidewires, to determine any reduction in radiation dose and contrast medium injection. The study was performed using a navigator prototype developed at the EndoCAS center. The system ...
Shang Eric K - - 2013
Growing evidence suggests that peak wall stress (PWS) derived from finite element analysis (FEA) of abdominal aortic aneurysms (AAAs) predicts clinical outcomes better than diameter alone. Prior models assume uniform wall thickness (UWT). We hypothesize that the inclusion of locally variable wall thickness (VWT) into FEA of AAAs will improve ...
Voros Szilard S Global Genomics Group, Richmond, Virginia. Electronic address: - - 2014
The objective of this study was to compare the diagnostic accuracy of quantitative coronary angiography (QCA), coronary computed tomography angiography (CTA), and intravascular ultrasound (IVUS) with fractional flow reserve (FFR) measurements. Eighty-five lesions (40% to 99% diameter stenosis) in 85 patients were prospectively interrogated by QCA, CTA, IVUS, and FFR. ...
Lindstedt Sandra - - 2013
Abstract Background. It has been debated whether or not heparin infusion before or after non-heart-beating donors are declared dead improves the quality of pulmonary grafts. In clinical lung transplantation with heart-beating donors (HBDs) heparin is routinely infused prior to organ harvesting since it is believed to improve pulmonary grafts by ...
Ghatak Tanmoy - - 2013
Internal jugular vein (IJV) catheterization is a routine technique in the intensive care unit. Ultrasound (US) guided central venous catheter (CVC) insertion is now the recommended standard. However, mechanical complications still occur due to non-visualization of the introducer needle tip during US guidance. This may result in arterial or posterior ...
Florescu Marius C - - 2013
We present a case of arteriovenous graft pseudoaneurysms treated endovascularly with stent grafts and make suggestions regarding the technique of evaluating the pseudoaneurysms and choosing the proper location to deploy the stent grafts to maximize the outcomes and minimize the length of the graft covered by the stent. We also ...
Patel Tejas - - 2013
Objectives The aim of this review is to discuss different methods of working through radial artery (RA) and brachial artery (BA) vascular complexities in order to increase the success rate of transradial approach (TRA). Background Anatomical complexities of RA and BA vasculature is an important reason for failure of TRA. ...
Vachharajani Tushar J - - 2013
Nonmaturing arteriovenous fistula remains a hurdle in improving the fistula rate in the hemodialysis population. Timely referral can assist in salvaging fistula with endovascular interventions. Pathology at the inflow segment is frequently encountered as a primary reason for maturation failure. Conventional retrograde angiography can result in poor delineation of the ...
Avrahami Idit - - 2013
Cerebral emboli originating in the ascending aorta are a major cause of noncardiac complications following cardiac surgery. The hemodynamics of the aortic cannula has been proven to play a significant role in emboli generation and distribution. The aim of the current study was to perform a thorough numerical investigation in ...
Rim Yonghoon - - 2013
Mitral valve (MV) repair using expanded polytetrafluoroethylene sutures is an established and preferred interventional method to resolve the complex pathophysiologic problems associated with chordal rupture. We developed a novel computational evaluation protocol to determine the effect of the artificial sutures on restoring MV function following valve repair. A virtual MV ...
Shapiro M - - 2013
BACKGROUND AND PURPOSE:Low-porosity endoluminal devices for the treatment of intracranial aneurysms, also known as flow diverters, have been in experimental and clinical use for close to 10 years. Despite rigorous evidence of their safety and efficacy in well-controlled trials, a number of key factors concerning their use remain poorly defined. ...
Wada Teruaki - - 2013
Coronary flow velocity reserve (CFVR) measurement in three major coronary arteries by transthoracic echocardiography is a promising and non-invasive method for detecting myocardial ischaemia. Its value when compared with fractional flow reserve (FFR) is unknown. Our aim was to determine the diagnostic accuracy of CFVR in three major coronary arteries ...
Xiao Nan - - 2013
We present a systematic comparison of computational hemodynamics in arteries between a one-dimensional (1-D) and a three-dimensional (3-D) formulation with deformable vessel walls. The simulations were performed using a series of idealized compliant arterial models representing the common carotid artery, thoracic aorta, aortic bifurcation, and full aorta from the arch ...
Nuri Takashi - - 2013
Recent supermicrosurgical techniques have made it possible to anastomose lymph vessels to the subdermal venular system. However, because the lymphatic fluid is clear and the vessel is translucent, soft, and fragile, with a thinner wall than blood vessels, supermicrosurgical lymphaticovenular anastomosis is a demanding technique. One difficulty of lymphaticovenular anastomosis ...
Tan Onder - - 2013
The Internal Mammary Artery (IMA) and its perforators play an important role in coronary bypass grafting and reconstructive breast, head, and neck surgery. This study aimed to obtain anatomic data pertaining to these vessels using Multi Detector Computed Tomography Angiography (MDCTA) and to demonstrate that the MDCTA could be a ...
Maleki Hoda - - 2013
Calcific aortic valve disease is the most common heart valve disease. It is associated with a significant increase in cardiovascular morbidity and mortality and independently increases the cardiovascular risk. It is then important to develop parameters that can estimate the stiffness of the valve. Such parameters may contribute to early ...
Kim S M - - 2013
To assess the additional value of adenosine-stress dynamic computed tomography (CT) perfusion (ASDCTP) imaging compared with coronary CT angiography (CCTA) alone to detect significant coronary artery stenosis for each threshold of 50% and 70% diameter stenosis. The study included 34 patients (65 ± 11 years, 79% men) with suspected coronary artery diseases ...
Shang Eric K - - 2013
Wall stress calculated using finite element analysis has been used to predict rupture risk of aortic aneurysms. Prior models often assume uniform aortic wall thickness and fusiform geometry. We examined the effects of including local wall thickness, intraluminal thrombus, calcifications, and saccular geometry on peak wall stress (PWS) in finite ...
Tane Shinya - - 2013
The purpose of this study was to compare the efficacy of 320-detector row computed tomography (CT) with that of 64-detector row CT for three-dimensional assessment of pulmonary vasculature of candidates for pulmonary segmentectomy. We included 32 patients who underwent both 320- and 64-detector CT before pulmonary segmentectomy, which was performed ...
Chen Yu - - 2013
Computed Tomography Angiography (CTA) plays an essential role in the diagnosis, treatment evaluation, and monitoring of cerebral aneurysms. Segmentation of CTA medical images of giant intracranial aneurysms (GIA) provides quantitative measurements of thrombus and aneurysms geometrical characteristics allowing 3D reconstruction. In fact, GIA demonstrated neuroradiological features and propensity of partial ...
Firwana Belal - - 2013
We performed an analysis to assess the need for conducting additional randomized controlled trials (RCTs) comparing open and endovascular aneurysm repair (EVAR) for abdominal aortic aneurysm (AAA). Trial sequential analysis (TSA) is a statistical methodology that can calculate the required information size of a meta-analysis and assess the risk of ...
Helmi M - - 2013
Background: External leg and lower body compression (ELC) has been used for decades in the prevention of deep vein thrombosis and the treatment of leg ischemia. Because of systemic effects, the methods have regained interest in anesthesia, surgery and critical care. This review intends to summarize hemodynamic effects and their ...
Karimi A - - 2013
Atherosclerosis is the most serious and common form of cardiovascular disease in which plaque builds up inside the arteries. Peak plaque stress is considered as the main reason for plaque rupture, which results in heart attack and stroke. In the current research, the finite element method is used to anticipate ...
Chan Sherwin - - 2013
We introduce a new technique for quantifying arterial stenoses, stenosis index (SI), using frequency analysis of the spectral Doppler waveform. Spectral Doppler waveforms obtained distal to arterial stenoses were enveloped, and the envelope was transformed into the frequency domain via Fourier transform. Stenosis index represents the ratio of the power ...
Shammas Nicolas W - - 2013
We report a case of a stented common femoral artery acute occlusion following deployment of an Angio-Seal closure device treated successfully with JetStream atherectomy under distal embolic protection using a NAV6 filter. The JetStream device, with its rotational atherectomy and continuous active aspiration feature, was effective in restoring normal flow ...
Stoecker Christina - - 2013
Purpose: Computed tomography (CT) imaging is the modality of choice for lung cancer diagnostics. With the increasing number of lung interventions on sublobar level in recent years, determining and visualizing pulmonary segments in CT images and, in oncological cases, reliable segment-related information about the location of tumors has become increasingly ...
Park Hyun Wook - - 2013
This study proposes more objective methods for deciding the appropriate direction of the sylvian fissure dissection during surgical clipping in middle cerebral artery (MCA) bifurcation aneurysms. We reviewed data of 36 consecutive patients with MCA bifurcation aneurysms. We measured 2 indices preoperatively on 3-dimensional computed tomography angiography (3D-CTA). Analysis of ...
Chan Cangel Pui-Yee CP Accident and Emergency Medicine Academic Unit, Prince of Wales Hospital, The Chinese University of Hong Kong New Territories, Hong - - 2013
A proper alignment of the ultrasound beam to the aortic or pulmonary outflow tracts is essential to acquire accurate signals. This study aimed to investigate the influence of different positions on the acquisition of Doppler signals using a noninvasive transcutaneous Doppler ultrasound. This was a prospective observational crossover study. Two ...
Duangthongpon Pichayen P Department of Surgery, Faculty of Medicine, Khon Kaen University, - - 2013
Bony landmarks are important in identifying and avoiding various structures, and thus, decreasing surgical morbidity. Knowledge of frontal bone was studied to help surgeons with safe craniotomy as temporooccipital region study was rare. To identify usefulness of supramastoid crest and relationship to venous and Labbe's vein. Twenty fresh cadaveric heads, ...
Mudaliar Radhika Paramesh RP Assistant Professor, Department of Anatomy, M.S. Ramaiah Medical College , Bangalore, Karnataka-560054, India - - 2013
Synostosis or fusion of atlas with occipital bone is known as occipitocervical synostosis, occipitalization of the atlas, or atlanto-occipital fusion. This is a rare congenital malformation at craniovertebral junction. Its incidence ranges from 0.08%-3% in general population. Occipitocervical synostosis result in narrowing of foramen magnum which may compress the brain ...
Fujimoto Motoaki M Division of Interventional Neuroradiology, Department of Radiological Sciences, David Geffen School of Medicine, University of California Los Angeles; Los Angeles, CA, USA - E-mail: - - 2013
Perforator infarction represents a critical problem after intracranial Wingspan stent. To explore the mechanism of perforator infarction, we simulated the stent-artery interaction at an atheromatous plaque with perforator. Structural deformation and biomechanical stress distribution after stenting were analyzed. High radial stress values were located along the stent struts, which surrounded ...
Wissgott C C Institute of Diagnostic and Interventional Radiology/Neuroradiology, Westkuestenklinikum Heide - Academic Teaching Hospital of the Universities of Kiel, Luebeck and Hamburg, - - 2014
The design and material determine the mechanical properties of stents. In vitro parameters such as radial force, flexibility and wall adaptation of different stents were investigated in order to obtain evidence for clinical use. A total of 8 stents, including 2 hybrid stents with a combination of closed/open-cell design (Sinus ...
Yang Ming-Shiang - - 2013
The purpose of the technical note is to introduce the complex coil assisted coil embolization method in the treatment of intracranial small aneurysm, in order to enhance the safety of the procedure. The first microcatheter was navigated into the aneurysm sac and the ultrasoft coil was used as the embolization ...
Stecher David - - 2013
To facilitate minimally invasive coronary artery bypass grafting, a simplified alternative for hand-sutured anastomoses must be developed. We assessed the feasibility and anastomotic healing of the ameliorated Excimer laser-assisted nonocclusive anastomosis coronary prototype connector in an acute rabbit study (study 1) and in a long-term porcine off-pump coronary bypass study ...
Rayepalli Sagar - - 2013
Flow diversion techniques are increasingly used to treat cerebral aneurysms. The optimal stent porosity to achieve aneurysm obliteration would allow clinicians to treat aneurysms more effectively. We sought to determine the optimal porosity threshold in an in vitro flow model that would lead to stagnation of flow in an aneurysm. ...
Meinel F G - - 2013
Objectives: The aim of the study was to determine whether automated quantification of pulmonary perfused blood volume (PBV) in dual-energy computed tomography pulmonary angiography (DE-CTPA) can be used to assess the severity of chronic thromboembolic pulmonary hypertension (CTEPH).Methods: Automated quantification of PBV was performed in 25 consecutive CTEPH patients undergoing ...
Naleem Asif - - 2013
Lower limb angioplasty is a common procedure. However, arterial lengths have not been well studied and there is no evidence base for the optimum catheter lengths required for the various applications of femoral or distal below-the-knee angioplasty. The industry standard catheter measures 80 cm. Fifty CT angiograms were post-processed using vessel ...
Russell Jeremy H - - 2013
The management of unruptured aneurysms is controversial, with the decision to treat influenced by aneurysm characteristics including size and morphology. Aneurysmal bleb formation is thought to be associated with an increased risk of rupture. To correlate computational fluid dynamic (CFD) indices with bleb formation. Anatomical models were constructed from three-dimensional ...
Son Myoung Kyun - - 2013
Aortic root size is an important parameter in vascular diseases and can be easily assessed by transthoracic echocardiography. However, measurements values may vary according to cardiac cycle and the definition used for edge. This study aimed to define normal values according to the measurement method specified by two different guidelines ...
Wu Yongyou - - 2013
This paper aims to report the complete absence of the superior mesenteric artery (SMA) in an adult and to propose a new classification method for the superior-inferior mesenteric arterial variations (SIMAV). A 69-year-old female was referred for abdominal pain and change of stool habits and characteristics. Multi-detector computed tomography (MDCT) ...
Yoo Saha - - 2013
To introduce a safe and reliable method for the management of peripheral vessels around the uterine artery during abdominal radical hysterectomy or abdominal radical trachelectomy. From 2007 to 2011, 102 patients with invasive cervical cancer underwent an abdominal radical hysterectomy. In 48 operations in 2007-2009, we performed the conventional radical ...
Zarins Christopher K CK HeartFlow, Inc., Redwood City, CA, USA, - - 2013
Recent advances in image-based modeling and computational fluid dynamics permit the calculation of coronary artery pressure and flow from typically acquired coronary computed tomography (CT) scans. Computed fractional flow reserve is the ratio of mean coronary artery pressure divided by mean aortic pressure under conditions of simulated maximal coronary hyperemia, ...
Higuchi Kazuhiko K Department of Cardiovascular Surgery, NTT Medical Center Tokyo, Tokyo, - - 2013
Here, we describe a technique for creating a secure anastomosis between a graft and the stump of the aorta, involving the fragile aortic wall between the folded flap of the graft inside the aorta and a Teflon felt strip outside.
Wang Yang - - 2013
The type of paraclinoid aneurysm has been used to decide management methods. Our aim was to assess the relation of the types of paraclinoid aneurysms and outcomes after endovascular treatment and the efficiency of present endovascular techniques. A retrospective analysis was performed on patients with saccular paraclinoid aneurysms that had ...
Shahzad Rahil - - 2013
Accurate detection and quantification of coronary artery stenoses is an essential requirement for treatment planning of patients with suspected coronary artery disease. We present a method to automatically detect and quantify coronary artery stenoses in computed tomography coronary angiography. First, centerlines are extracted using a two-point minimum cost path approach ...
Byrne G - - 2013
BACKGROUND AND PURPOSE:Hemodynamics play an important role in the mechanisms that govern the initiation, growth, and possible rupture of intracranial aneurysms. The purpose of this study was to objectively characterize these dynamics, classify them, and connect them to aneurysm rupture.MATERIALS AND METHODS:Image-based computational fluid dynamic simulations were used to re-create ...
Lauric Alexandra - - 2013
Flow induced tangential wall shear stress (WSS) is thought to be involved in aneurysm formation, growth, and rupture. Low WSS was previously associated with rupture, but definitive quantitative analyses remain scant as larger aneurysms are associated with lower WSS regardless of rupture status, and ruptured aneurysms are larger than unruptured ...
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