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Results 301 - 350 of 2154
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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 ...
Celi Simona - - 2013
In clinical practice, maximum diameter is used as a criterion to estimate aneurysm-rupture risk; however, it is only a general indicator and its value becomes difficult to estimate in the thoracic segment. Improved understanding of aortic aneurysm complexity and biomechanics is needed to achieve advancements in surgical repair techniques. The ...
Islak Civan - - 2013
Endovascular treatment of geometrically complex bifurcation aneurysms using a standard Y-configured stenting technique might be extremely difficult, particularly in aneurysms with daughter branches that acutely arise from the aneurysm sac itself. In those cases, deployment of the second stent through interstices of the first stent could be troublesome because of ...
Hillebrand Julia - - 2013
Neuroprotection is of paramount interest in cardiac surgery. Right axillary artery cannulation is well established in aortic surgery because it significantly improves survival and outcome, but malperfusion of the right brain after direct cannulation has been reported. Anatomically, 4 vessel segments are potentially amenable for cannulation of the subclavian and ...
Toepker Michael - - 2013
OBJECTIVE. The purpose of this study was to use second-generation dual-source CT to assess the influence of size, degree of stenosis, luminal contrast attenuation, and plaque geometry on stenosis quantification in a coronary artery phantom. MATERIALS AND METHODS. Six vessel phantoms with three outer diameters (2, 3, and 4 mm), ...
Yu B-T - - 2013
Valve replacement is the primary surgical treatment for heart valve disease. However, the clinical benefit of biological valve substitutes is limited by their potential immunogenicity. To seek a better method of preparing biological scaffolds for tissue engineering heart valves, we compared the ability of different decellularization procedures to remove cells ...
Lalović Nenad - - 2013
Aim To determine the pattern of origin of medial circumflex femoral artery (MCFA), its origin distance from the midpoint of the inguinal ligament and the topographical relations of the origin, which have great significance in clinical work. Methods Dissections on the autopsy group of 42 thighs were performed, and anatomical ...
Riga Celia V - - 2013
Purpose : To investigate the quality of stent-graft fenestrations created in vitro using different needle puncture and balloon dilation angles in different commercial endografts. Methods : Fenestrations were made in a standardized fashion in 3 different endograft types: Talent monofilament twill woven polyester, Zenith multifilament tubular woven polyester, and Endofit ...
Mortoza Amanda Rocha - - 2013
The blood supply in the large intestine of seven specimens of the lesser anteater, Tamandua tetradactyla, studied. The method included preparation of the macroscopic collection report, perfusion of the arterial network with water, injection of colored latex, fixation in formaldehyde, and preservation in ethanol. For our description and analyses, we ...
Gür Ali Kemal - - 2013
The aim of the present study was to describe a successful method for treating rheumatic tricuspid valve stenosis with autologous pericardium, commissurotomy, and a Kalangos ring without replacing the tricuspid valve.
Lin Yidan - - 2013
When performing video-assisted thoracoscopic esophagectomy, the area at the level above the aortic and in the space between the esophagus and the spine, is usually regarded as a safe area for dissection of upper segment of thoracic esophagus. However, an aberrant right subclavian artery may appear in this area and ...
Niepoth Wouter W - - 2013
To investigate the feasibility of using endoanchor technology to reduce chimney graft-related gutter size in a juxtarenal aneurysm model. In silicone juxtarenal aortic aneurysm models with two sizes of branch arteries and two sizes of aorta, single chimney graft (CG) configurations were constructed using 6-mm Atrium balloon-expandable stent-grafts in association ...
Rachev Alexander A College of Engineering and Computing, Biomedical Engineering Program, University of South Carolina, Columbia, SC 29208, USA. - - 2013
The objective of this study is to propose a method for preliminary processing of the experimental data from an inflation-extension test on tubular arterial specimens. The method is based on the condition for existence of a strain energy function (SEF) and can be used to verify whether the data from ...
Kanahara Masaaki - - 2013
Measurement of flow-mediated dilation (FMD) is well known as a noninvasive method for an assessment of vascular endothelial function. However, the reproducibility is a major issue of FMD measurement. The purpose of this study is to examine the reproducibility of the new FMD measurement with medial epicondyle method. First, to ...
Menke Jan - - 2013
This meta-analysis summarizes the accuracy of magnetic resonance angiography (MRA) for diagnosing residuals in coiled cerebral aneurysms by using the threefold Roy classification (residuals: none, neck, or sac). Four databases were searched from 2000 to June 2013 for eligible studies that compared MRA to digital subtraction angiography (DSA) and reported ...
Kim H - - 2013
The aim of this study was to predict the optimal depth for insertion of a left-sided central venous catheter in children. Using 3D chest computed tomography angiography, we measured the distance from a point where the internal jugular vein is at the superior border of the clavicle, and from a ...
Strobl Magdalena - - 2013
Background and aims: The use of fractional exhaled nitric oxide (FeNO) has been suggested as a quantitative marker for pulmonary arterial hypertension (PAH) in humans. To further characterize FeNO in PAH we investigated this marker in a rodent model. As there is no standardized technique for FeNO measurement in animals, ...
Toutouzas Konstantinos - - 2013
Microwave radiometry allows noninvasive in vivo measuring of internal temperature of tissues reflecting inflammation. In the present study, we evaluated the predictive accuracy of this method for the diagnosis of coronary artery disease (CAD). Consecutive patients (n=287) scheduled for coronary angiography were included in the study. In carotid arteries of ...
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