Evaluation of Cross-Circulation Through Circle of Willis Using An Ultrasonic Doppler Technique
نویسندگان
چکیده
blood flow regulation: Vascular resistance adjustments in the circle of Willis. Stroke 7: 147-150, 1976 28. Kanzow E, Dieckhoff D: On the location of the vascular resistance in the cerebral circulation. In Brock M, Fieschi C, Ingvar DH, Lassen NA, Schflrmann K (eds) Cerebral Blood Flow. Berlin, Heidelberg, New York, Springer-Verlag, pp 96-97, 1969 29. Clark ME, Himwich WA, Martin JD: Simulation studies of factors influencing the cerebral circulation. Acta Neurol Scand 43: 189-204, 1967
منابع مشابه
Evaluation of cross-circulation through circle of Willis using an ultrasonic Doppler technique. Part I. Comparison between blood flow velocity by ultrasonic Doppler flowmetry and angiogram.
In 24 patients with cerebrovascular disease and 6 without organic brain lesions, the increased velocity of blood flow in both the internal carotid and vertebral arteries during a contralateral carotid compression was compared with the angiographic appearance of the circle of Willis. The flow velocity was measured using ultrasonic Doppler flowmetry. It was not possible to investigate fully the r...
متن کاملEvaluation of cross-circulation through circle of Willis using an ultrasonic Doppler technique. Part II. Comparison between blood flow velocity by ultrasonic Doppler flowmetry and cerebrovascular resistance.
The correlation between the increase in velocity of blood flow in both the internal carotid and vertebral arteries during a carotid compression and the cerebrovascular resistance (CVR) was investigated in 11 patients with chronic ischemic cerebrovascular disease and 4 without organic brain lesions. The velocity of blood flow was measured by an ultrasonic Doppler flowmeter. CVR was calculated fr...
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Purpose: The circle of willis is responsible for blood supply of brain, which may suffer from anatomical variations. These disturbances can lead to aneurysm or even arterial rupture. The purpose of this study was to evaluate the anatomical structure of the cerebral arteries forming the circle of willis in adult cadavers. Also, cerebral versus non- cerebral versus non-cerebral arterial walls wer...
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OBJECTIVES The aim of the study was to evaluate the role of anatomical completeness of the circle of Willis for sufficient brain perfusion during unilateral cerebral perfusion and the methodology of the preoperative and intraoperative functional assessments of adequate cross-perfusion. METHODS This prospective observational study included all elective patients (99) who underwent elective open...
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INTRODUCTION The circle of Willis is thought to play a key role in development of collateral flow in patients with internal carotid artery stenosis (ICAS). AIM To assess flow in the circle of Willis in patients with recent ischemic stroke (IS). MATERIAL AND METHODS The study included 371 patients, 102 symptomatic with severe ICAS and recent IS (within the last 3 months) (group I) and 269 as...
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