Ultrasonic doppler examination of internal carotid artery stenosis.
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概要
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The importance of atheromatous carotid leions in the pathogenesis of TIA and stroke is well recognized.<BR>We used an ultrasonic duplex scanner which permitted B mode arterial images and a pulsed Doppler flowmeter to evaluate atheromatous extracranial carotid lesions. The velocity information was evaluated using a spectral analyser which permitted real time qualification of the frequency content of the Doppler signal.<BR>The maximal velocity of systolic phase in the common carotid artery (VmaxCCA) and internal carotid artery (VmaxICA) was examined to evaluate the caroid lesions in patients with TIA or stroke.<BR>VmaxICA in 14 normal carotid ranged from 1440 Hz to 3320 Hz. VmaxICA in 21 stenotic carotid ranged from 1840 Hz to 7720 Hz. Utilizing VmaxICA greater than 2000 Hz, the specificity was 50% and sensitivity was 95%. Utilizing VmaxICA greater than 2500 Hz, specificity was 93% and sensitivity was 43%.<BR>Flow velocity ratio (ratio of the maximal internal carotid artery flow velocity to the maximal common carotid artery flow velocity) in the normal carotid ranged from 0.78 to 1.36. Flow velocity ratio in the stenotic carotid ranged from 1.13 to 4.40. Utilizing flow velocity ratio greater than 1.10, sensitivity was 100% and specificity was 86%.<BR>The degree of stenosis in stenotic internal carotid artery was significantly correlated with VmaxICA and flow velocity ratio. However, the differentiation between mild and moderate stenosis was difficult. It was found that this method was useful to predict the stenosis in the internal carotid artery.
- 一般社団法人 日本脳卒中学会の論文
一般社団法人 日本脳卒中学会 | 論文
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