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Results 451 - 500 of 2171
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Cansu Aysegul - - 2013
PURPOSE: The purpose of the study was to compare the diagnostic value of color Doppler ultrasonography (CDUS) and multidetector computed tomography (MDCT) angiography against that of digital subtraction angiography (DSA) or surgery in the evaluation of failing hemodialysis arteriovenous fistulas (AVFs). MATERIALS AND METHODS: CDUS and MDCT angiography were performed ...
Besachio David A - - 2013
INTRODUCTION: Our objective is to determine the utility of noncontrast Hounsfield unit values, Hounsfield unit values corrected for the patient's hematocrit, and venoarterial Hounsfield unit difference measurements in the identification of intracranial venous thrombosis on noncontrast head computed tomography. METHODS: We retrospectively reviewed noncontrast head computed tomography exams performed in ...
Chapot René - - 2013
INTRODUCTION: The arteries of bifurcation aneurysms are sometimes so angulated or tortuous that an exchange maneuver is necessary to catheterize them with a balloon or stent delivery catheter. Because of the risk of distal wire perforation associated with exchange maneuvers, we sought to find an alternative technique. METHODS: Our experience ...
Tang Hui - - 2013
Purpose: The degree of stenosis is an important biomarker in assessing the severity of cardiovascular disease. The purpose of our work is to develop and evaluate a semiautomatic method for carotid lumen segmentation and subsequent carotid artery stenosis quantification in CTA images.Methods: The authors present a semiautomatic stenosis detection and ...
Lee Youn Joo - - 2013
The objective of this study was to assess the lumen visibility of carotid artery stents using multi-detector-row computed tomography (MDCT) angiography; compare medium-smooth, medium-sharp, and sharp kernels; and correlate these results to those of digital subtraction angiography (DSA). We retrospectively evaluated 52 stents from 51 patients who underwent 16- and ...
Thakar Tejal - - 2013
Purpose : To present a preliminary experience using a multilayer flow-modulating stent for trans/infragenicular popliteal endovascular aneurysm repair. Methods : Five men (mean age 76 years, range 62-86) with 6 popliteal artery aneurysms (PAAs) measuring 22 to 39 mm in diameter (mean 30) underwent endovascular repair using the Cardiatis Multilayer ...
Wang Jian-Bo - - 2013
Aim: To evaluate the use of a biodegradable nanofiber-covered stent (BDNCS) in the treatment of a canine carotid artery aneurysm. Materials and Methods: Seventeen beagle dogs, each with one lateral saccular aneurysm created using a venous pouch, were selected to test the BDNCS. The BDNCS consists of three parts: A ...
Kazui Teruhisa - - 2013
It is essential to select the optimum method of cerebral protection and operative technique for arch repair to improve the surgical outcome of arch aneurysm or dissection. Selective antegrade cerebral perfusion (SACP) is our current method of choice if required cerebral protection time exceeds 30 minutes. Moderate hypothermic two-arch vessel ...
Cevasco Marisa - - 2013
Currently, there is no universal standard for sizing bioprosthetic aortic valves. Hence, a standardized comparison was performed to clarify this issue. Every size of four commercially available bioprosthetic aortic valves marketed in the United States (Biocor Supra; Mosaic Ultra; Magna Ease; Mitroflow) was obtained. Subsequently, custom sizers were created that ...
Claiborne Thomas E TE Department of Biomedical Engineering, Stony Brook University, Stony Brook, New York 11794, - - 2013
Aortic stenosis is the most prevalent and life-threatening form of valvular heart disease. It is primarily treated via open-heart surgical valve replacement with either a tissue or a mechanical prosthetic heart valve (PHV), each prone to degradation and thrombosis, respectively. Polymeric PHVs may be optimized to eliminate these complications, and ...
Eren Erdem - - 2013
Endoscopic sinus surgery is a widely used technique in otolaryngologic practice. To avoid complications, the locations of important anatomical structures, such as the anterior ethmoid artery (AEA), should be determined preoperatively. We want to evaluate the effect of ethmoid cavity pneumatization on the location of the AEA and to determine ...
Park Yae Min - - 2013
This study evaluated the feasibility and accuracy of three-dimensional rotational angiography (3DRA) to determine the anatomy of the left atrium (LA) and pulmonary veins (PVs) compared with cardiac computed tomography (CCT) and trans-thoracic echocardiography (TTE). One hundred two patients (56.1 ± 9.9 years, 86 males) with an indication for atrial fibrillation ablation were ...
Elsharkawy Ahmed - - 2013
BACKGROUND:: Classification of MCA aneurysms is sometimes difficult, as the identification of the main MCA bifurcation, the key for accurate classification of MCA aneurysms, is inconsistent and somewhat subjective. OBJECTIVE:: We aimed to use the meeting point of M1 and M2 trunks as an objective, generally accepted and angiographically evident ...
Wittchow Eric - - 2013
Aims: Among three versions of bioresorbable magnesium scaffolds featuring different paclitaxel-elution kinetics, we determined the best-performing scaffold and compared it with established, paclitaxel-eluting, permanent stents TAXUS Liberté and eucaTAX. Methods and results: Drug-elution kinetics in magnesium scaffolds were modulated by varying the composition of their bioresorbable poly(lactide-co-glycolide) coating loaded with ...
Tateishi Yohei - - 2013
BACKGROUND: We aimed to evaluate the validity of duplex ultrasonography (DUS) using a microconvex array transducer (MAT) with enhanced flow imaging (EFI) for visualization of the distal, internal carotid artery (ICA) and the accurate assessment of ICA stenosis. METHODS: Patients who underwent both DUS and digital subtraction angiography (DSA) were ...
Martufi Giampaolo - - 2013
BACKGROUND: Monitoring the expansion of abdominal aortic aneurysms (AAAs) is critical to avoid aneurysm rupture in surveillance programs, for instance. However, measuring the change of the maximum diameter over time can only provide limited information about AAA expansion. Specifically, regions of fast diameter growth may be missed, axial growth cannot ...
Carnicelli Anthony P AP Division of Vascular Surgery, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, - - 2013
The use of cross-sectional area (CSA) measurements obtained from computed tomographic angiography (CTA) for the calculation of carotid artery stenosis has been suggested but not yet validated in a large population. The objective of this study was to determine whether CTA-derived CSA measurements were able to predict carotid stenosis with ...
Ma Ding D Toshiba Stroke and Vascular Research Center, University at Buffalo, State University of New York, 875 Ellicott Street, Buffalo, NY 14203, - - 2013
A flow diverter (FD) is a flexible, densely braided stent-mesh device placed endoluminally across an intracranial aneurysm to induce its thrombotic occlusion. FD treatment planning using computational virtual stenting and flow simulation requires accurate representation of the expanded FD geometry. We have recently developed a high fidelity virtual stenting (HiFiVS) ...
Owasirikul Wiwat - - 2013
The purpose of the study was to design a hybrid decision support system (HDSS) that could simulate the embolized coil selection pattern of the radiologists in aneurysms treatment. As the longest available length of the coils should be used in most cases, therefore only the shape diameter (SD) selection was ...
Weisz Giora - - 2013
Studies have suggested that operator proficiency has a substantial effect on complication rates and procedural outcomes. Endovascular simulators have been used for training and have been proposed as an alternative to the conventional assessment of skills. The present study sought to validate simulation as an objective method for proficiency evaluation ...
Coentrão Luis - - 2013
Vascular access problems are a daily occurrence in hemodialysis units. Loss of patency of the vascular access limits hemodialysis delivery and may result in underdialysis that leads to increased morbidity and mortality. Despite the known superiority of autogenous fistulae over grafts, autogenous fistulae also suffer from frequent development of stenosis ...
Abe Yukio - - 2013
BACKGROUND: Pocket-sized echocardiography may serve as an initial tool to screen for aortic stenosis (AS). The purpose of this study was to evaluate the usefulness of a novel and simple method using pocket-sized echocardiography to screen for AS. METHODS: Subjects (n = 130) with systolic ejection murmur or known AS were studied. ...
Kono K - - 2013
BACKGROUND AND PURPOSE:SACE is performed for complex aneurysms. There are several configurations of stent placement for bifurcation aneurysms. We investigated hemodynamics among 8 different configurations of stent placement, which may relate to the recanalization rate.MATERIALS AND METHODS:We created a silicone block model of a patient-specific asymmetric bifurcation aneurysm. Enterprise closed-cell ...
Vlachovsky Robert - - 2013
OBJECTIVE: Abnormal haemodynamics is commonly agreed to be a major contributor to the development of distal anastomotic intimal hyperplasia. A new vascular graft design proposed by computational studies was used to demonstrate its surgical feasibility and to compare it with the conventional graft in a porcine model. METHOD: The device ...
Yli-Ollila Heikki - - 2013
Our objective was to develop a method for studying the biomechanics of the common carotid artery (CCA) by evaluating both radial and less known axial distension of the arterial wall. We developed software capable of tracking the movements of different arterial wall layers from ultrasound recordings of CCA, and we then ...
Selamet Tierney Elif Seda ES Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA. - - 2013
The Pediatric Heart Network is conducting a large international randomized trial to compare aortic root growth and other cardiovascular outcomes in 608 subjects with Marfan syndrome randomized to receive atenolol or losartan for 3 years. The authors report here the echocardiographic methods and baseline echocardiographic characteristics of the randomized subjects, ...
Blanco P J PJ Laboratório Nacional de Computação Científica, Av. Getúlio Vargas 333, Quitandinha, 25651-075 Petrópolis, Brazil. - - 2013
In this work, a computational procedure is proposed to vascularize anatomical regions supplied by many inflow sites. The proposed methodology creates a partition of the territory to be vascularized into nonoverlapping subdomains that are independently supplied by the so-called perforator arteries (inflow sites). Then, in each subdomain, the constrained constructive ...
Coulombe Nicolas - - 2013
INTRODUCTION: A novel cryoballoon with improved refrigerant distribution promises better pulmonary vein (PV) isolation success rate without sacrificing the technology's safety profile. This study aimed to compare the Arctic Front® (AF) balloon to the new Arctic Front Advance™ (AFA). METHODS AND RESULTS: Twenty pulmonary PVs from 10 healthy dogs weighing ...
Hametner Bernhard - - 2013
OBJECTIVES: Recently, a novel method to estimate aortic pulse wave velocity (aPWV) noninvasively from an oscillometric single brachial cuff waveform reading has been introduced. We investigated whether this new approach provides acceptable estimates of aPWV compared with intra-aortic catheter measurements. METHODS: Estimated values of aPWV obtained from brachial cuff readings ...
Franquet A - - 2013
The stiffness of the arterial wall, which is modified by many cardiovascular diseases such as atherosclerosis, is known to be an indicator of vulnerability. This work focuses on the in vivo quantification of the stiffness of the common carotid artery (CCA) by applying the Magnitude Based Finite Element Model Updating ...
Kölbel T - - 2013
Aim: The aim of this paper was to present a mathematical model to calculate the required main aortic graft-diameter for parallel chimney-grafts. Methods: Geometric approximation model, developed to allow for a standardized calculation of the main aortic graft-diameter determined by the aortic diameter and the diameter of the chimney-graft. Results: ...
Chen Haoyu - - 2013
We propose a novel method to reconstruct the hypothetical geometry of the healthy vasculature prior to intracranial aneurysm (IA) formation: a Frenet frame is calculated along the skeletonization of the arterial geometry; upstream and downstream boundaries of the aneurysmal segment are expressed in terms of the local Frenet frame basis ...
Stavropoulou-Deli Alcestis - - 2013
BACKGROUND: Minimally invasive procedures, such as the TVT-Secur™, have been linked to injury to the corona mortis. Injury during the insertion of the TVT-Secur™ happens due to the vessel's position close to the place of the margin (25-30 mm from the symphysis pubis). AIMS: Systematic description of the aberrant vessel anatomy ...
Park Jaechan - - 2013
OBJECTIVE: Certain clinical situations, such as a surgical embolectomy for an acute embolic occlusion of the internal carotid artery (ICA) or the surgical repair of a blood blister-like aneurysm (BBA), can require the superior wall of the ICA to be repaired using a microsuture technique. This can be complicated and ...
Kalashyan Harapet - - 2013
We describe a 68-year-old man with acute stroke in whom the newly developed single sweep method for three-dimensional (3D) carotid ultrasound provided a rapid and comprehensive assessment of atherosclerotic plaque burden in the internal carotid artery. The two-dimensional duplex carotid scan diagnosed 50-69% stenosis, and with the three-dimensional method, the ...
de Bruin Jorg L - - 2013
Purpose : To determine gutter size and stent-graft geometry in an in vitro juxtarenal aneurysm model using various chimney graft (CG) configurations. Methods : Two silicone juxtarenal aortic aneurysm models were constructed combining different diameters of the aorta and renal artery. In a single-branched CG configuration, 2 sizes (23 and ...
Bukac Martina - - 2013
Recent in vivo studies, utilizing ultrasound contour and speckle tracking methods, have identified significant longitudinal displacements of the intima-media complex, and viscoelastic arterial wall properties over a cardiac cycle. Existing computational models that use thin structure approximations of arterial walls have so far been limited to models that capture only ...
Lim Kyung Seob - - 2013
The aim of this study was to compare the stent designed by Chonnam National University Hospital (designated as CNUH) with commercial cobalt-chromium coronary stent in a porcine coronary overstretch restenosis model. CNUH stent was subjected to mechanical performance tests. Pigs were randomized into two groups in which the coronary arteries ...
Silva Júnior Severino Lourenço da - - 2013
OBJECTIVE: To develop an experimental model of stable saccular aneurysm in carotid of pigs using the internal jugular vein. METHODS: In 12 healthy pigs, weighing between 25 and 50kg, five males and seven females, we made a right common carotid artery aneurysm. After elliptical arteriotomy, we carried out a terminolateral ...
Czerski A - - 2013
Animal models of abdominal aortic aneurysms (AAA) enable preclinical studies on new therapeutic approaches and help to understand pathophysiology of the disease. The aim of this study was to demonstrate the effectiveness of selected methods of experimental induction of abdominal aortic aneurysm in swine and to adapt the EMG examination ...
Gupta Neeraj - - 2013
Blunt thoracic trauma manifests in various ways, depending on the structures injured and type of injury. Commonly manifested as parenchymal contusion, at times, pseudacavitation may also been seen on the chest X ray. They are to be differentiated from other causes of pulmonary cavitations which are often done based on ...
Chiu Peixuan P Department of Surgery, Yong Loo Lin School of Medicine, National University of Singapore, - - 2013
Background: Endovascular repair of the aortic arch is often unsatisfactory due to poor stent-vessel conformity and inadequate landing zones. Objective: To study the anatomical characteristics of the aortic arch and provide basic information for the development of arch-specific endovascular devices. Materials and methods: Three-dimensional models were reconstructed in Mimics (image ...
Kim Moo Hyun - - 2013
OBJECTIVES: We report our evaluation of a novel retrograde wiring technique known as the Rendezvous method. BACKGROUND: Different strategies of retrograde approaches can be used to improve the success rate of recanalization of coronary chronic total occlusion (CTO). We previously introduced the Rendezvous technique as an alternative final step for ...
Kro Grete A B - - 2013
OBJECTIVE: To determine the association between 5-min Apgar score and umbilical cord artery carbon dioxide tension (pCO2 ). DESIGN: Observational study. SETTING: European hospital labor wards. POPULATION: Data from 36 432 newborns ≥36 gestational weeks were obtained from three sources: two trials of monitoring with fetal electrocardiogram (the Swedish randomized controlled ...
Bel Alain - - 2013
BACKGROUND: In selected type B acute aortic dissection with aortic growth and patent false lumen, an intervention may be required to prevent aortic rupture. Apart from stent grafting of the thoracic aorta, aimed at occluding the primary intimal tear, some have advocated closure of reentry tears by stent grafting of ...
Rivera Ivan Romero - - 2013
AIMS: There is no definitive and reliable echocardiographic method for estimating the pulmonary vascular resistance (PVR) to differentiate persistent vascular disease from dynamic pulmonary hypertension. The aim of this study was to analyze the relationship between the pulmonary venous blood flow velocity-time integral (VTIpv) and PVR. METHODS AND RESULTS: Eighteen ...
Satow Tetsu - - 2013
BACKGROUND:: In treating cavernous sinus dural arteriovenous fistulas (CSdAVFs), transvenous embolization of the whole affected sinus is usually performed, which may result in the disturbance of normal venous drainage, or permanent cranial nerve palsy. Objective: To describe superselective shunt occlusion (SSSO) of CSdAVFs. METHODS:: Between July 2005 and August 2011, ...
Fialova Jana - - 2013
Backround: Intermittent claudication is a classic symptom of peripheral arterial disease. It is mainly treated conservatively but if this fails, a form of revascularization is indicated. The revascularization in chronic occlusion of femoropopliteal region is currently performed by two basic methods: the standard method of surgical bypass and the newer ...
Park Jun-Bean - - 2013
Aim: The cardio-ankle vascular index (CAVI) is an index of arterial stiffness. We investigated the association of CAVI with the severity of coronary artery calcification (CAC) and coronary stenosis by coronary computed tomography angiography (CTA) in an asymptomatic population.Methods: A total of 549 asymptomatic Korean individuals who underwent CAVI and ...
Helle Michael - - 2013
In three example patients suffering from internal carotid artery occlusion, intracranial steno-occlusive disease, and symptomatic arteriovenous malformation (AVM), a new method named superselective pseudo-continuous arterial spin labeling (pCASL) was used in addition to clinical routine measurements. The capabilities of this method are demonstrated to gain important information in diagnosis, risk ...
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