In 400 patients referred for non-invasive vascular assessment by ultrasono graphy, 29% of 214 with transient ischaemic attacks, 25% of 44 with reversible ischaemic neurological deficits and 28% of 46 with recovered stroke had signifi cant extracranial internal carotid artery disease. For amaurosis fugax, 65% of 74 patients had significant disease. Both cerebral and ocular symptoms of simi lar laterality with respect to one carotid occurred together in 22 patients, of whom 86% had significant internal carotid disease. Bruit was heard in 29% of carotids in 200 symptomatic patients. Only 45% of bruits were associated with significant internal carotid disease. The external carotid alone was shown to be the source of cervical murmur in a significant number of patients.
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