نتایج جستجو برای: carotid doppler

تعداد نتایج: 93907  

Journal: :Stroke 1979
S M Otis R A Smith D J Dalessio A D Kroll M Rush R B Dilley

In an effort to evaluate the effectiveness of the Doppler Ophthalmic Test (DOT) following carotid endarterectomy, a large group of patients was examined both pre- and postoperatively with non-invasive techniques. The DOT, which has proven to be a useful non-invasive diagnostic test for the determination of significant carotid artery stenosis, was found to be persistently abnormal in 46% of pati...

Journal: :Stroke 1985
J Weinberger M Goldman

Patients with symptoms of cerebral ischemia are often evaluated with non-invasive carotid artery testing. An abnormal carotid Doppler ultrasound frequency shift pattern of early systolic flutter (ESF) was demonstrated by auscultation and velocity wave form analysis in patients with normal carotid bifurcations. Ten of these patients were studied with echocardiography (echo) and eight had mitral ...

Journal: :مجله دانشگاه علوم پزشکی کرمانشاه 0
houshang najafi ph.d. student in physiology, department of physiology, shiraz university of medical sciences. saeid khameneh associate professor in physiology, tabriz university of medical sciences. mehdi farhoudi assistant professor in neurology, tabriz university of medical sciences.

introduction : cerebral autoregulation (ca) and mean cerebral blood flow velocity in males and females are still under controversy. the present study was scheduled to address the effect of sex on these parameters. materials and methods : the present study was interventional and performed on 30 healthy volunteers (15 males aging from 20-30 yrs and mean age of 23.9±3 years old and 15 females agin...

Journal: :AJNR. American journal of neuroradiology 2006
S O Oktar C Yücel D Karaosmanoglu K Akkan H Ozdemir N Tokgoz T Tali

BACKGROUND AND PURPOSE Optimal estimation of cerebral blood-flow volume (BFV) may be an important indicator for better evaluation of the patients with cerebrovascular disorders. In this study, we compared the BFV values at bilateral internal carotid and vertebral arteries of healthy volunteers obtained with color Doppler, power Doppler, and B-flow ultrasound (US) studies and tried to determine ...

Journal: :Stroke 2001
P G Al-Rawi P Smielewski P J Kirkpatrick

BACKGROUND AND PURPOSE The clinical application of intracranial near-infrared spectroscopy in adults has been hampered by concerns over contamination from extracranial tissues. The NIRO 300 (Hamamatsu Photonics) provides continuous online measurements of hemoglobin and cytochrome oxidase concentrations and a calculated tissue oxygen index (TOI). The present study seeks confirmation of the anato...

2005
Hugh S. Markus

Background and Purpose Carotid angioplasty may offer an effective treatment for carotid stenosis, but there has been concern about the incidence and clinical consequences of distal embolization. Transcranial Doppler monitoring in carotid endarterectomy has demonstrated embolic signals during this procedure. We used this technique in patients undergoing carotid angioplasty. Methods Transcranial ...

Journal: :Stroke 1981
J P Archie

A non-invasive Doppler velocity index that is specific for carotid artery stenosis is presented. The index is both non-dimensional (maximum/minimum velocity to remove within artery Doppler signal variability) and normalized (larger over smaller carotid maximum/minimum ratio to minimize between patient variability). Of 260 normal patients 94% had a maximum/minimum index between 1.00 and 1.25 and...

Journal: :Stroke 1985
M Fischer K Alexander

Contralateral obstructions have been suggested to be responsible for inaccuracy in Doppler sonographic diagnosis and estimation of severity of internal carotid artery stenoses. Therefore correlations of the systolic peak frequency of the internal carotid artery (Doppler-Frequency-Spectrum-Analysis) and severity of stenoses found by angiography have been compared in subgroups with (n = 36) and w...

Journal: :JPMA. The Journal of the Pakistan Medical Association 1999
A A Razzaq B A Khan C K Jadoon S M Baig

BACKGROUND The present study focuses on the role of carotid doppler ultrasonography (CDUS) in the diagnosis and management of carotid stenosis in young stroke patients. METHODS The findings of carotid doppler in 45 ischemic stroke patients between 15-45 years of age were reviewed retrospectively. The variables of interest for this study included risk factors for atherosclerotic disease, prima...

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