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المستخلص
This study was carried on was conducted on two groups; 30 patients presenting with cerebrovascular insufficiency within the territory of the vertebrobasilar system and 20 normal cont rol subj ect s. Of the patients group, 22 presented with established stroke and 8 with TIAs.
Duplex sonography showed positive findings in 60% of our patients. Colorcoded ultrasonography allows detection of vertebral artery (VA) hypoplasia, site of occlusion and vertebrobasilar hemodynamic assessment. The extracranial VA was occluded in 26.7% and hypoplastic in 6.7 % of our patients. VA was occluded distally (intracranially) in 23.3 % of our patients.
Blink reflex and Brainstem auditory evoked potential studies have proved to be sensitive methods of detection of posterior circulation territory dysfunction, with 73.3% and 63.3% agreement with MRA respectively.