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Updated: Aug 18, 2026

Permanent Cerebral Vessel Occlusion via Double Ligature and Transection
Published on: July 21, 2013
Subclavian steal despite ipsilateral vertebral occlusion
Abstract:
In the classic subclavian steal syndrome, vertebrobasilar insufficiency is caused by reverse flow in the vertebral artery ipsilateral to a subclavian stenosis or occlusion. We present two patients with vertebrobasilar insufficiency and ipsilateral vertebral and subclavian occlusive disease. The postulated mechanism of vertebrobasilar insufficiency is reverse flow in collateral neck vessels. In both patients, symptoms were relieved by carotid subclavian bypass. Thus, vertebral occlusion ipsilateral to a subclavian stenosis does not preclude subclavian steal syndrome.
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