Ultrasonic Doppler Studies after Superficial Temporal-Middle Cerebral Artery Anastomosis

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Abstract
The ultrasonic Doppler technique was applied to evaluate the effect of STA-MCA [superficial temporal-middle cerebral artery] anastomosis. The STA itself and the ophthalmic and major aortocranial arteries were recorded by the Doppler technique in 12 patients who underwent STA-MCA anastomosis for internal carotid artery occlusion or stenosis. The examination was performed before and within 1 mo. after the operation. The blood flow pattern of the STA, which had an external carotid flow pattern, was altered to an internal carotid flow pattern by the STA-MCA bypass operation. The findings of Doppler sonograms of the STA were consistent with postoperative angiograms and precisely represented the bypass patency. Among 7 patients with reverse flow direction in the ophthalmic artery before the operation, the reverse flow had decreased in 5 patients postoperatively. No remarkable change in the ophthalmic artery was detected in the remaining 2 patients. The blood flow velocity patterns of major aortocranial arteries showed no change postoperatively.