Amaurosis fugax caused by microemboli via external carotid atery.
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概要
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In 2 cases presenting with amaurosis fugax as the only manifest clinical symptom, the direction of blood flow through the ophthalmic artery was investigated using a transcranial Doppler method and the results were collated with cerebral angiographic findings. The patients studied were a 77-year-old female and a 51-year-old male, both of whom were shown to have the "away flow" type of blood flow (from the anterior segment of the eye to the brain) in the opthalmic artery on the affected side. Cerebral angiography revealed complete occlusion of the internal carotid artery in the latter patient, a high degree of stenosis, due to plaque formation, at the origin of the internal carotid artery in the former and the development of collateral pathways connecting between arteries of the external and internal carotid systems by way of the ophthalmic artery in both. While lodgment in a tributary of the ophthalmic artery of microembolic originating in the internal carotid artery has been implicated as the most common cause of amaurosis fugax, the findings obtained in the present cases suggested that microemboli that were formed in the occluded segments of the internal carotid and became lodged in the external carotid arterial system might play a primary role in the pathogenesis of the amaurosis fugax. Transcranial Doppler method, being noninvasive and easy to use repeatedly, is thought to prove of great aid in diagnostic evaluation of these arterial disorders.
- 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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