Search Results
Results 451 - 500 of 1847
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Long Quan - - 2008
This numerical study aims to investigate the capacity of the circle of Wills (CoW) to provide collateral blood supply for patients with unilateral carotid arterial stenosis. The basic 3D geometry of the CoW was reconstructed based on a magnetic resonance angiogram of a normal human subject. A total of 52 ...
Pipinos Iraklis I - - 2009
Internal carotid artery (ICA) flow reversal is an effective means of cerebral protection during carotid stenting. Its main limitation is that in the absence of adequate collateral flow it may not be tolerated by the patient. The purpose of this study was to determine if preoperative identification of intracranial collaterals ...
Ansel Gary M - - 2008
Stroke is one of the most significant causes of death and morbidity worldwide. Atherosclerotic stenosis of the extracranial internal carotid artery has been invoked as a common causative factor for stroke in over 20% of patients. Although medical therapy can help to prevent the onset and progression of carotid arteriosclerosis, ...
Takayama Katsutoshi - - 2008
PURPOSE: No filter protection devices for carotid artery stenting (CAS) have been formally approved for use in Japan; however, as of April 2008, the Angioguard XP (AGXP) was approved. This article describes our initial results using the AGXP during CAS for the treatment of carotid artery stenosis. MATERIAL AND METHODS: ...
Paukovits Tamás Mirkó - - 2008
To assess primary success and safety of percutaneous transluminal angioplasty (PTA) and/or stenting of ostial/proximal common carotid artery lesions (pCCA) and to compare its 30-day stroke/mortality level with the literature data for surgical options. A total of 147 patients (153 stenoses, 6 recurrent) (71 female; 121 left) with significant diameter ...
De Silva Deidre Anne - - 2008
INTRODUCTION: Coronary artery disease (CAD) is the leading cause of death following ischaemic stroke. We aimed to study the prevalence and associations of concomitant CAD among ischaemic stroke patients in Singapore. MATERIALS AND METHODS: We prospectively studied 2686 consecutive Asian ischaemic stroke patients. RESULTS: CAD was prevalent among 24% of ...
Ibrahim Shahnaz Hamid - - 2008
Perinatal arterial ischaemic strokes are a major cause of morbidity in the neonatal period and leads to significant neurological morbidity. It is however under recognized as an entity and usually missed till the baby is 3-4 months of age when they first present with hemiplegia. Perinatal arterial ischaemic strokes are ...
AbuRahma Ali F - - 2008
The optimal duplex ultrasound (DUS) velocity criteria to determine in-stent carotid restenosis are controversial. We previously reported the optimal DUS velocities for >or=30% in-stent restenosis. This prospective study will further define the optimal velocities in detecting various severities of in-stent restenosis: >or=30%, >or=50%, and 80% to 99%. The analysis included ...
Telman Gregory - - 2008
Sixty-five years old patient suffering from acute stroke was treated by rTPA intravenously. TCD monitoring of both middle cerebral arteries (MCA) was carried out simultaneously with administration of rTPA. Seven microemboli were found in right and four in left MCA. Duplex ultrasound, CT angiography and digital subtractional angiography revealed occlusion ...
van Prehn J - - 2008
PURPOSE: Clinical decision making for carotid surgery depends largely upon stenosis grade. While digital subtraction angiography remains the gold standard for stenosis grading, many physicians use less invasive modalities. The purpose of this study was to compare the results of multidimensional Computed tomography (CTA) with ultrasound (US) grading and peak ...
Kang Suk Y - - 2008
BACKGROUND: Stroke mechanisms and clinical features of anterior cerebral artery (ACA) territory infarction have rarely been investigated using MRI. OBJECTIVES: To verify stroke mechanisms and to make clinical imaging correlation. METHODS: Clinical, MRI, and angiographic findings of 100 consecutive patients with ACA infarction were studied. RESULTS: Motor dysfunction (n = ...
Ozdemir O - - 2008
BACKGROUND AND PURPOSE: Cervical internal carotid artery (ICA) occlusion with middle cerebral artery (MCA) embolic occlusion is associated with a low rate of recanalization and poor outcome after intravenous thrombolysis. Prompt revascularization is required to prevent disabling stroke. We report our experience on acute ischemic stroke patients with tandem ICA ...
Ovbiagele Bruce - - 2008
Little is known about short-term vascular risk after transient ischemic attack (TIA) caused by intracranial atherosclerosis. To quantify the early risk of ischemic stroke in the territory of a stenotic intracranial artery after TIA and to identify clinical and imaging features associated with increased risk of stroke in the territory ...
Ogata Jun - - 2008
OBJECTIVE: This study was designed to determine the histopathological characteristics of cardiac and vascular lesions responsible for various subtypes of ischemic stroke. METHODS: Postmortem pathological examination was performed on 142 patients who died within 30 days of the onset of ischemic stroke in the National Cardiovascular Center, Osaka, Japan. RESULTS: ...
Yang Eric H - - 2008
Stroke is one of the leading causes of morbidity and mortality in the United States. Approximately 700,000 Americans suffer from a stroke per year and 270,000 of these patients will die as a result of their stroke. The etiology of cerebrovascular events can be attributed to carotid artery disease in ...
Fernández-Seara María A - - 2008
An improved arterial spin labeling (ASL) perfusion technique that combines pseudo-continuous labeling and a T2*-insensitive sequence (GRASE) with background suppression was used to acquire perfusion maps in normal volunteers and stroke patients. It is shown that perfusion measurements obtained in less than 1 min of scan time are reproducible, with ...
Imamura Hiroshi - - 2008
When undertaking portal vein embolization (PVE) in patients with hepatocellular carcinoma (HCC), the following possibilities should be considered: (1) failure to induce hypertrophy of the nonembolized segments due to the underlying liver disease, (2) acceleration of tumor growth by occlusion of the portal venous flow because HCC is a hypervascular ...
Shaalan Wael E - - 2008
Reliability of the most commonly used duplex ultrasound (DUS) velocity thresholds for internal carotid artery (ICA) stenosis has been questioned since these thresholds were developed using less precise methods to grade stenosis severity based on angiography. In this study, maximum percent diameter carotid bulb ICA stenosis (European Carotid Surgery Trial ...
Tang Sung-Chun - - 2008
Impaired dynamic cerebral autoregulation (DCA) has been shown in patients with severe (> or =70%) internal carotid artery (ICA) stenosis, but DCA in moderate (50% to 69%) ICA stenosis, especially its response to carotid revascularization, has rarely been reported. Our study aimed to characterize DCA in severe and moderate ICA ...
Nakase Taizen - - 2008
The inflammation plays a critical role in the stroke onset and even in the worsening of the lesions. Therefore, the investigation of inflammatory response in the acute stage may contribute to improve the treatment of ischemic stroke. High-sensitive CRP (hsCRP), IL-6 and TNFalpha were measured as inflammatory markers on admission ...
Tateishi Yohei - - 2008
BACKGROUND AND PURPOSE: The aim of this study is to assess contrast-enhanced transcranial color-coded duplex sonography (CE-TCCS) diagnosis of basilar artery (BA) stenosis. METHODS: CE-TCCS and cerebral angiography were performed in 120 consecutive patients. The patients were angiographically divided into five groups: (1) intracranial arteries (ICA) stenosis but no BA ...
Ritter Martin A - - 2008
OBJECTIVE: To compile available studies using microembolic signal (MES) detection by transcranial Doppler sonography in varying sources of arterial brain embolism. We investigated prevalences of MES and whether MES detection is of proven use for risk stratification. METHOD: Studies reporting prevalences of MES and the risk of cerebral ischemic events ...
Froelich Sebastien C - - 2008
BACKGROUND: Exposure of the most distal portion of the cervical segment of the internal carotid artery (ICA) is technically challenging. Previous descriptions of cranial base approaches to expose this segment noted facial nerve manipulation, resection of the glenoid fossa, and significant retraction or resection of the condyle. We propose a ...
Kobayashi Masakazu - - 2008
A 62-year-old man and a 44-year-old man with unilateral cervical carotid artery stenosis (less than 50% with echolucent plaque and ulceration) suffered recurrent ischemic stroke events despite treatment with antiplatelet and anticoagulation drugs. Carotid endarterectomy (CEA) was performed under transcranial Doppler monitoring for the detection of micro-emboli using a microscope ...
Izci Yusuf - - 2008
OBJECTIVE: Access to the high cervical internal carotid artery (ICA) is technically challenging for the treatment of lesions in and around this region. The aims of this study were to analyze the efficacy of approaching the high cervical ICA through the retromandibular fossa and to compare preauricular and postauricular incisions. ...
Rathakrishnan Rahul - - 2008
INTRODUCTION: Transcranial Doppler (TCD) is an established tool for the non-invasive assessment of cerebral blood flow. Since TCD results vary with the skills and experience of the sonographer, it requires validation against contrast angiography. We evaluated the diagnostic accuracy of TCD against computed tomography angiography (CTA) and the feasibility of ...
Schneider Laurence M - - 2008
There are several anatomical appearances of the carotid bifurcation. A calyceal type of bifurcation, superimposed with distal angulation of the internal carotid artery (ICA) and added ICA stenosis can be extremely challenging with regard to placement of embolic protection devices, prolonging manipulation of the lesion, procedure time, increasing contrast use ...
Hussain Syed I - - 2008
OBJECTIVE: The aim of this study was to compare transesophageal echocardiography (TEE) and cardiac-gated computerized tomography (CGCT) in detecting aortic atherosclerosis (AA). BACKGROUND: There is evidence that AA can be a source of embolic material causing ischemic stroke. TEE is a well-established tool for detecting cardiac sources of emboli in ...
Delgado M G - - 2008
Most patients with symptomatic internal carotid artery occlusion have a single minor or major hemispheric stroke. A minority of patients have ipsilateral retinal ischemia, recurrent strokes, or transient ischemic attacks. Whereas spontaneous carotid recanalization is rare, acute surgical recanalization has been attempted, with mixed results. Recently, acute endovascular recanalization has ...
Jakubowska Malgorzata M - - 2008
INTRODUCTION: A debate is emerging over whether the treatment time window in acute stroke can be extended beyond 6 h if penumbral tissue can be identified. Treatment decisions are very difficult in cases of tandem proximal carotid occlusion with arterioarterial intracranial embolism. We enter this debate with the present report ...
Brian W. Chong; Mayo ...
We present a case of an elderly male with sudden onset of a posterior circulation stroke that rapidly progressed to coma. Despite a dismal prognosis due to his age, the cause of his stroke, and his rapid clinical deterioration to a comatose state, he had an exceptional outcome. We attribute ...
Horie Nobutaka - - 2008
Arterial communication between cavernous segments of the carotid arteries associated with unilateral agenesis of the internal carotid artery (ICA) is extremely rare. We herein present a case of unilateral ICA agenesis with transcavernous anastomosis that presents with an anterior communicating artery (ACoA) aneurysm, and discuss its embryogeny and clinical implications. ...
Meerwaldt R - - 2008
INTRODUCTION: The practice of carotid endarterectomy (CEA) with patch angioplasty is more effective compared to primary closure. However, the type of patch material remains a controversy. The Fluoropassiv thin wall carotid patch is a polyester patch with an interpenetrating, nanometer-scale, solvent-applied surface modification, based on a biocompatible fluoropolymer. The present ...
Parthenis Dimitrios G - - 2008
To investigate the hemodynamics and clinical presentation of common carotid artery occlusion (CCAO), we reviewed 6,415 patients with suspected carotid artery disease in whom a color Duplex imaging (CDI) examination was performed. According to distal vessel patency, the following CDI classification of CCAO was adopted: type I (patent both distal ...
Kirton Adam - - 2008
OBJECTIVE: Perinatal stroke commonly causes childhood neurological morbidity. Presumed perinatal ischemic stroke (PPIS) defines children presenting outside a normal perinatal period with chronic, focal infarction on neuroimaging. Infarcts are assumed to represent arterial strokes, but recent evidence suggests the periventricular venous infarction (PVI) of infants born preterm may also occur ...
Kim Ji Sun - - 2008
Stroke is the third most common cause of death worldwide following ischemic heart disease and cancer and the number one condition associated with permanent disability. In Western countries, the yearly incidence of stroke is approximately 0.2% of the population and the number of stroke-related death is expected to double over ...
Bernard Timothy J - - 2008
Arterial ischemic stroke (AIS) is a rare disorder in children. Research suggests that risk factors, outcomes, and presentation are different from those of adult stroke. In particular, prothrombotic abnormalities and large vessel arteriopathies that are nonatherosclerotic seem to play a large role in the pathogenesis of childhood AIS. This review ...
Dahl T - - 2008
AIM: The aim of this study was to describe the number and severity of carotid artery stenosis in an unselected stroke population in hospital. METHODS: The carotid arteries were investigated consecutively with color-coded duplex scanning in patients suspected of having stroke and admitted to a stroke unit during a 6-month ...
de Mendonça José Luiz Furtado - - 2008
OBJECTIVE: Dysgenesis of the internal carotid artery (ICA) is a broad term comprising hypoplasia, aplasia and agenesis of the vessel. It is a rare anomaly, often clinically silent, that can be confidently diagnosed by means of noninvasive imaging methods. METHODS: After a review of teaching files, 7 patients with unilateral ...
Hong Keun-Sik - - 2009
Acute ischemic stroke secondary to aortic dissection (AoD) is challenging in the era of thrombolysis owing to the diagnostic difficulty within a narrow time window and the high risk of complications. A 64-year-old woman with middle cerebral artery occlusion syndrome admitted to the emergency room within intravenous recombinant tissue plasminogen ...
Leong S S Department of Radiology, Beaumont Hospital, Dublin, Ireland - - - 2008
Internal carotid artery (ICA) dissection is an important cause of stroke in the younger population. Carotid stenting with or without angioplasty is usually the preferred treatment for symptomatic patients who have failed medical therapy. We report a case of a symptomatic internal carotid artery dissection at the petrous segment of ...
Thomalla Götz - - 2008
BACKGROUND AND PURPOSE: The benefit of intravenous thrombolysis in tandem internal carotid artery (ICA)/middle cerebral artery (MCA) occlusion remains unclear. We studied clinical and imaging outcome of intravenous thrombolysis in MRI-selected patients with tandem ICA/MCA occlusion as compared to isolated MCA occlusion. METHODS: We analyzed data of MRI-selected acute ischemic ...
Arthurs Zachary M - - 2008
Our institution previously reported an association between elevated C-reactive protein (CRP) and carotid artery stenosis. Based on this finding, we sought to further evaluate the association of CRP levels with ultrasound progression of carotid artery stenosis, and/or clinical events. A prospective observational study of patients evaluated for carotid artery stenosis ...
Nakamura Shin - - 2009
BACKGROUND: The major risk of CEA is perioperative stroke. NIRS can detect ischemic changes during CEA; however, possible watershed-type perfusion defects may not be detected by single-channel NIRS occurring at some distance from the light source. In the present case, we tested the usefulness of optical topography (ie, multichannel NIRS, ...
Horn Peter - - 2008
OBJECT: Standard extracranial-intracranial (EC-IC) arterial bypass surgery represents a well-recognized procedure in which the aim is to augment distal cerebral circulation. The creation of the bypass requires temporary occlusion of the recipient vessel. Thus, there exists controversy about the risk of standard EC-IC arterial bypass surgery causing ischemic complications due ...
Yim Peter J - - 2008
OBJECTIVE: Narrowing of the poststenotic internal carotid artery (ICA) has been found to be associated with reduced risk of ipsilateral stroke. A paradoxical mechanism has been hypothesized to explain this finding: narrowing of the distal-normal (reference) ICA is associated with low blood flow rates (Q) in the stenotic ICA, and ...
Buszman PaweĊ‚ - - 2008
BACKGROUND: Efficacy of carotid endarterectomy (CEA) in prevention of stroke in patients with carotid artery stenosis has been confirmed in randomised trials. Carotid artery stenting (CAS) is a routine clinical practice and recent results of CAS are not worse than CEA. Moreover, percutaneous transluminal angioplasty (PTA) techniques allow other cephalad ...
Pogliani Laura - - 2008
Stroke is an uncommon but increasingly recognized cause of mortality and long-term neurologic morbidity in newborns. We report the case of a neonate presenting an asymptomatic episode of complete middle left cerebral artery infarction. The power Doppler three-dimensional ultrasound allowed an early diagnosis and an accurate bedside evaluation.
Heyer Kamaldeep S - - 2008
Carotid artery stenting is rapidly emerging as a minimally invasive alternative to carotid endarterectomy for the treatment of cervical carotid artery occlusive disease and stroke prevention. Periprocedural stroke risk still remains a concern despite improvements in technique and equipment. We will review technical, clinical and radiographic factors associated with an ...
Stabile Eugenio E Laboratory of Invasive Cardiology, Clinica Montevergine, Mercogliano, - - 2008
Proximal endovascular clamping (PEC) appears to be a safe and effective cerebral protection technique for carotid artery stenting (CAS). So far the presence of severe stenosis of the ipsilateral external carotid artery (ECA) was considered a contraindication to PEC. This study presents the results of PEC for CAS in patients ...
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