Search Results
Results 501 - 550 of 2012
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Bajwa Navkirat S - - 2012
BACKGROUND CONTEXT: Tandem stenosis of the cervical and lumbar spine is known to occur in 5% to 25% of individuals with symptomatic neural compression in one region. However, the prevalence of concurrent lumbar and thoracic stenosis is not known. Whether this relationship is because of an increased risk of degenerative ...
Lee Kibaek K Mechanical Engineering Department, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, PA 15213, - - 2013
An abdominal aortic aneurysm (AAA) carries one of the highest mortality rates among vascular diseases when it ruptures. To predict the role of surface curvature in rupture risk assessment, a discriminatory analysis of aneurysm geometry characterization was conducted. Data was obtained from 205 patient-specific computed tomography image sets corresponding to ...
Qiao Huaiyu - - 2012
The precision of the measurement of the angulation of coronary stents or lesions using coronary angiography (CA) and computed tomographic angiography (CTA) has not been established, and obtaining a rotating artery tree to measure angulation based on CTA is time-consuming. The aim of this study was to evaluate the utility ...
Sommerkamp Sarah K - - 2012
OBJECTIVE: The axillary vein is an easily accessible vessel that can be used for ultrasound-guided central vascular access and offers an alternative to the internal jugular and subclavian veins. The objective of this study was to identify which transducer orientation, longitudinal or transverse, is better for imaging the axillary vein ...
Spiotta Alejandro M - - 2012
BACKGROUND: The 'balloon-then-stent' method involves stent placement after completion of a balloon-assisted embolization. The drawback to this technique is that the coil mass achieved during balloon remodeling must be crossed prior to stent deployment. This additional maneuver introduces the potential risk of coil disruption. We describe the first report of ...
Giurgea Georgiana-Aura - - 2012
BACKGROUND: Carotid duplex ultrasonography is the prime investigation used to grade carotid artery stenosis in clinical routine. We compared the carotid ultrasound (US) scans performed externally with our results. MATERIALS AND METHODS: This retrospective study included 288 patients who had been referred to our outpatient department and initially presented with ...
Valen-Sendstad Kristian - - 2012
High-frequency flow fluctuations in intracranial aneurysms have previously been reported in vitro and in vivo. On the other hand, the vast majority of image-based computational fluid dynamics (CFD) studies of cerebral aneurysms report periodic, laminar flow. We have previously demonstrated that transitional flow, consistent with in vivo reports, can occur ...
Takimura Celso Kiyochi - - 2012
BACKGROUND: Fast post-implantation stent endothelialization is desirable for theoretically reducing the possibility of stent thrombosis. OBJECTIVE: To evaluate the extent of sirolimus-eluting stent strut endothelialization (delivered from the luminal and abluminal aspects or abluminal aspect only) in the iliac arteries of rabbits. METHODS: The iliac arteries of 10 rabbits were ...
Singla Amit - - 2012
BACKGROUND: Coil embolization has gained importance in the management of intracranial aneurysms over the past decade. However, the recurrence risk after embolization mandates closer follow-up than surgical clip ligation. Currently, there is no reliable system for predicting aneurysm sac thrombosis. An aneurysm embolization grade (AEG) reported previously by the senior ...
Yousefzadeh Gholamreza - - 2012
AIM: Insulin-like growth factor-1 (IGF-1) has been identified as a valuable indicator for impaired glucose tolerance, and its relationship with the presence of coronary atherosclerosis has been also suggested. A few studies have assessed the relationship between IGF-1 level and severity of atherosclerosis. In the present study, the relationship between ...
Ho Harvey - - 2012
In this paper we present an electrical analog model for the hepatic arterial buffer response (HABR), an intrinsic regulation mechanism in the liver whereby the arterial flow counteracts the changes in portal venous flow. The model itself is a substantial simplification of a previously published model, with nonlinear arterial and ...
Morgan B - - 2012
Post-mortem computed tomography with coronary angiography (PMCTA) could have a role in the investigation of sudden natural death. This study assesses the accuracy of targeted coronary PMCTA, using both air and iodinated contrast media, to provide sensitivity and specificity for critical stenosis (CS) on a segmental basis, based on a ...
Gardner Andrew W AW CMRI Diabetes and Metabolic Research Program, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73117, USA. - - 2013
To compare arterial elasticity in children, adolescents, and young adults with and without metabolic syndrome (MetS), and to assess which MetS components, demographic measures, and body composition measures are associated with arterial elasticity. Two-hundred six subjects (107 females and 99 males) between the ages of 10 and 20years were recruited ...
Mladenovic Zorica - - 2012
Purpose: Multislice computed coronary angiography (MSCT) provides valuable morphological information about coronary artery disease, but precise quantification of coronary stenosis remains difficult. Transthoracic color Doppler echocardiography (TDE) gives a new insight into the functional significance of coronary luminal narrowing. We have tried to assess the additive value of coronary flow ...
Southard Nicholas M - - 2012
Aberrant right subclavian artery (ARSA) is an uncommon congenital anomaly that often becomes aneurysmal. The ARSAs are often asymptomatic but aneurysms arising in this location are potentially lethal. Due to the high morbidity and mortality rates associated with the traditional open repair methods, less invasive endovascular methods are becoming more ...
Holte Espen - - 2012
BACKGROUND: The aim of this study was to determine whether poststenotic diastolic-to-systolic velocity ratio (DSVR) assessed by transthoracic Doppler echocardiography could accurately identify significant stenoses in the left coronary artery. METHODS: A total of 108 patients scheduled for coronary angiography because of chest pain or acute coronary syndromes were studied. ...
Higuchi Koji - - 2012
PURPOSE OF REVIEW: Superior vena cava (SVC) is one of the most important nonpulmonary vein origins of atrial fibrillation, and SVC should be carefully treated in order to decrease the recurrence of atrial fibrillation after ablation. Despite the fact that pulmonary vein isolation (PVI) should be performed prophylactically for all ...
Elefteriades John A - - 2012
The Cabrol fistula, which shunts blood from the perigraft space to the right atrium in cases of refractory bleeding after ascending aortic replacement, is a useful technique. A drawback is the potential for troublesome venous back-bleeding into the perigraft space. We describe a modification using a valved Contegra graft, which ...
Arieli Ran - - 2012
The traditional method used to evaluate escape masks has been to examine the composition of the inspired gas, although arterial carbon dioxide (CO2) and oxygen (O2) would be more relevant physiological parameters. The recent development of reliable, fast-responding transcutaneous CO2 detectors makes it possible to evaluate arterial CO2 and O2 ...
Sillesen Henrik - - 2012
Atherosclerosis is the leading cause of death and disabling disease. Whereas risk factors are well known and constitute therapeutic targets, they are not useful for prediction of risk of future myocardial infarction, stroke, or death. Therefore, methods to identify atherosclerosis itself have been tested and found useful (ie, coronary calcium ...
Zhang Yiqun - - 2012
ABSTRACT: The transsphenoidal approach to the pituitary is widely used in pituitary surgery. Even though there are some landmarks for internal carotid artery (ICA) on the wall of the sphenoid sinus, it is not rare to get the artery injured during surgery. We found that the most important landmark, carotid ...
Kardeşoğlu Ejder - - 2012
We report a method of the placement of the guiding catheter in two cases in which the diagnostic catheter could be easily engaged to the target coronary arteries but not a guiding catheter, due to a distorted aortic sinus and an osteal subtotal occlusion, respectively. After engaging to the target ...
Arkuszewski M - - 2012
We prospectively compared the accuracies of conventional transcranial Doppler ultrasound (TCD) and transcranial color-coded duplex sonography (TCCS) in the diagnosis of narrowing of the basilar (BA) and vertebral arteries (VA). Fifty-six consecutive patients (mean age 55.8 years; 34 women) after subarachnoid hemorrhage (n=46), stroke or transient ischemic attack (n=5), and ...
Salehi M G - - 2012
Dissecting posterior cerebral artery (PCA) aneurysms are among rare cerebrovascular malformations accounting for 2% to 6% of all aneurysms. Herein we describe a case of pediatric dissecting aneurysm located in the PCA with documentation of aneurysm development. In addition, we discuss its treatment with a new therapeutic method involving glue ...
Caldwell Jane - - 2012
Catheter ablation for persistent AF remains a challenge to the ablator as the disease is now outside the veins and cannot be tackled by pulmonary vein isolation alone. In this article we describe targeting complex fractionated atrial electrograms (CFAE) as a method to guide atrial substrate modification.
Hirai Yukoh - - 2012
Background: Distinguishing left-and right-sided atrial tachycardia (AT) is often challenging. The coronary sinus (CS) provides information only concerning the anterior left atrium (LA). Potentials recorded in the pulmonary artery (PA) have been substituted for those of the upper posterior LA because of their anatomical relationship. Methods and Results: Three patterns were designed, ...
Obi Andrea - - 2012
Venous thromboembolism (VTE), particularly thrombi in the inferior vena cava (IVC) and pulmonary embolism, can occur after successful extracorporeal membrane oxygenation (ECMO) and can be associated with adverse outcomes including death. VTE is related to the presence of a venous cannula and in some cases inadequate anticoagulation caused by clinical ...
van der Laan Michelle E - - 2012
Background:The goal of this study was to determine the effect of balloon atrial septostomy (BAS) on cerebral oxygenation in neonates with transposition of the great arteries (TGA).Methods:In term neonates with TGA, regional cerebral tissue oxygen saturation (r(c)SO(2)) was measured using near-infrared spectroscopy (NIRS) for two-hour periods before, 2 hours (hs) ...
Klein Andrew J AJ Department of Medicine, Division of Cardiology, John Cochran Veterans Affairs Medical Center, St. Louis University School of Medicine, St. Louis, Missouri, - - 2012
To demonstrate the feasibility of magnetic resonance imaging (MRI) to X-ray fluoroscopy (XRF) image fusion to guide peripheral artery chronic total occlusion (CTO) recanalization. Endovascular peripheral artery CTO revascularization is minimally invasive, but challenging, because the occlusion is poorly visualized under XRF. Devices may steer out of the artery, which ...
Mahammedi Abdelkader - - 2012
PURPOSE:: We studied the relationship between pulmonary artery diameter (PAD) as measured on computed tomography (CT) and pulmonary artery pressure (PAP) with the specific goal of assessing the reliability of various measurements on high-resolution chest CT as predictors of pulmonary hypertension (PH). MATERIALS AND METHODS:: In a preliminary study we ...
Türkvatan Aysel - - 2012
Purpose The purpose of the study was to determine the prevalence of coronary artery anomalies and to demonstrate in which cases multidetector computed tomography has an additional clinical value compared with the conventional angiography. Material and methods A total of 2375 multidetector computed tomography studies were retrospectively reviewed to determine ...
Johri Amer M - - 2012
BACKGROUND: Screening tools for the detection of coronary artery disease (CAD) are of considerable interest in light of skyrocketing risk factors. Recent work suggests that carotid plaque has a relatively unexplored role in CAD risk prediction but has previously been limited by the difficulty in quantifying its irregular architecture using ...
Iwakiri Takashi - - 2012
BACKGROUND: Ultrasound-determined carotid intima-media thickness (IMT) is widely used as an indicator of generalized atherosclerotic burden, but there are limited autopsy findings in support of the association, directly. METHODS: We performed an autopsy analysis (n = 111, mean 68.8 years; 65.0% men; 86% non-cardiovascular disease death) to examine the associations of microscopy-determined ...
Suárez Poveda Tatiana - - 2012
OBJECTIVE: To determine the diagnostic usefulness of multidetector computed angiotomography in the diagnosis limb arterial injuries in patients with suspicion of arterial injury with no indication of immediate surgery. METHODS: Non-invasive 64-channel multidetector computed tomography (MDCT) was performed on 99 limbs suspected of having a traumatic vascular injury over a ...
Shobayashi Yasuhiro - - 2012
OBJECT: Little is known about how much protection a flow diversion stent provides to a non-thrombosed aneurysm without the adjunctive use of coils. METHODS: A three-dimensional anatomically realistic computation aneurysm model was created from the digital subtraction angiogram of a large internal carotid artery-ophthalmic artery aneurysm which could have been ...
Zhang Ying - - 2012
OBJECTIVE: The purpose of our report is to evaluate the use of color Doppler echocardiography (CDE) with four chamber view (4CV), scanning around left atrium, and four-dimensional echocardiography with B-flow imaging and spatiotemporal image correlation (4D BF-STIC) in detecting fetal pulmonary veins at 17 to 40 weeks' gestation. METHODS: This was ...
de Jong Koert P - - 2012
BACKGROUND: Early hepatic artery thrombosis (eHAT) after liver transplantation occurs in 3% of adults and 8% of children and often results in retransplantation. eHAT is initially asymptomatic and arterial patency is monitored with percutaneous Doppler ultrasound screening (pDUS). The aim of the study is to analyze the diagnostic accuracy of ...
Cho Young Dae - - 2012
BACKGROUND:: Protection techniques using stents or microcatheters allow treatment of aneurysms with complex configurations by coil embolization. However, the application of these techniques is occasionally limited in wide neck middle cerebral artery (MCA) aneurysms with acute angularity of the efferent branch vessel. OBJECTIVE:: We describe a looping technique for passage ...
Guglin Maya - - 2012
Background:  Risk factors of pulmonary hypertension (PH) are poorly understood. The objective of this study was to identify the determinants of PH in young adults. Methods:  We analysed a limited access dataset from the CARDIA (Coronary Artery Risk Development in Young Adults) study provided by the National Heart, Lung and ...
Akpinar Ibrahim - - 2012
Coronary angiography is a widely used diagnostic method for coronary artery disease. In clinical practice, although complications of the procedure often involve the vascular access point, there is no previous report of the fracture and embolization of the distal tip of a pigtail catheter. Herein, we present the case of ...
Yoon Byul Hee - - 2012
Removal of the anterior clinoid process (ACP) is an essential process in the surgery of giant or complex aneurysms located near the proximal internal carotid artery or the distal basilar artery. An extradural clinoidectomy must be performed within the limits of the meningeal layers surrounding the ACP to prevent morbid ...
Garvey Patrick B - - 2012
In designing an osteocutaneous fibula flap, poor planning, aberrant anatomy, or inadequate perforators may necessitate modification of the flap design, exploration of the contralateral leg, or additional flap harvest. The authors studied the predictive power of computed tomographic angiography in osteocutaneous fibula flap planning and execution. The authors studied a ...
González-Darder José M - - 2012
Purpose The study of the clinical, anatomic, imaging, and microsurgical characteristics of the aneurysms of the internal carotid-posterior communicating artery (ICA-PComA) segment and their relationships with the skull base structures. Methods The anatomic relationships of PComA with neurovascular elements and skull base structures were studied in cadavers. The clinical, imaging, and microsurgical ...
Lee Dennis L Y - - 2012
Introduction The endoscopic endonasal approach to the parapharyngeal space (PPS) and jugular foramen is not well defined. We sought to systematically define the important landmarks and limitations of this new surgical technique using an endoscopic transmaxillary transpterygoid corridor. Methods Endoscopic dissection was performed in both sides of two latex-injected cadaver heads. Left-sided ...
Tian Lian L Department of Biomedical Engineering, University of Wisconsin-Madison, Madison, Wisconsin, - - 2012
During the progression of pulmonary hypertension (PH), proximal pulmonary arteries (PAs) undergo remodeling such that they become thicker and the elastic modulus increases. Both of these changes increase the vascular stiffness. The increase in pulmonary vascular stiffness contributes to increased right ventricular (RV) afterload, which causes RV hypertrophy and eventually ...
Auricchio F - - 2013
Finite element analysis is nowadays a well-assessed technique to investigate the impact of stenting on vessel wall and, given the rapid progression of both medical imaging techniques and computational methods, the challenge of using the simulation of carotid artery stenting as procedure planning tool to support the clinical practice can ...
Mestres G - - 2012
OBJECTIVES: The aim of this study is to identify which endograft, and to what degree of oversizing, in combination with what type of parallel stent, may result in the most adequate fit in a juxtarenal abdominal aneurysmal neck when using a parallel-stent technique. MATERIALS/METHODS: In-vitro silicon aneurysmal neck models of ...
Geisbüsch Sarah S Department of Cardiothoracic Surgery, Mount Sinai Medical Center, New York, NY 10029, USA. - - 2012
A better understanding of the response of the spinal cord blood supply to segmental artery (SA) sacrifice should help minimize the risk of paraplegia after both open and endovascular repair of thoracoabdominal aortic (TAA) aneurysms. Twelve female juvenile Yorkshire pigs were randomized into 3 groups and perfused with a barium-latex ...
Grunkemeier Gary L - - 2012
OBJECTIVES: To compare the probability, and modes, of explantation for Carpentier-Edwards pericardial versus porcine valves. METHODS: Our porcine series began in 1974 and our pericardial series in 1991, with annual prospective follow-up. We used the Kaplan-Meier method and Cox regression for estimation and analysis of patient mortality, and the cumulative ...
Liu Xiaopeng - - 2012
PURPOSE: Many authors reported that microsurgical varicocelectomy was among the best treatment modalities for varicocele. However, the difference in intraoperative anatomic detail between macroscopic and microsurgical varicocele repair in the same spermatic cord has not been critically discussed. METHODS: Between August 2010 and February 2011, 32 men with 42 sides' ...
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