Predictability of extracranial/intracranial bypass function: a retrospective study of patients with occlusive cerebrovascular disease

Neurosurgery
T IwamaK Hayashida

Abstract

When the efficacy of extracranial/intracranial bypass surgery is discussed, can we include the patients with extensive collateral circulation through the bypass and those with poor collateral circulation in the same group? The bypass function should be determined not by the patency of the bypass but by the extent of collateral circulation through the bypass. We retrospectively analyzed our patients to determine whether the extent of bypass flow can be predicted from the results of preoperative studies. In 51 hemispheres of 44 consecutive patients who underwent extracranial/intracranial bypass surgery, correlation between the extent of bypass flow and the preoperative results of angiographic and stimulated cerebral blood flow studies were investigated. The bypass function is highly predictable with the aid of preoperative studies. In 11 hemispheres that showed both retrograde spontaneous circulation via leptomeningeal anastomoses and decreased reactivity to acetazolamide of cerebral blood flow in an area distal to the arterial lesion, collateral circulation through the bypass developed well and reactivity to acetazolamide improved. In all of 13 hemispheres that showed normal reactivity to acetazolamide, the bypass was patent but...Continue Reading

References

Sep 1, 1986·Surgical Neurology·J I Ausman, F G Diaz
Sep 1, 1986·Surgical Neurology·A L DayJ R Little
Oct 1, 1994·Stroke; a Journal of Cerebral Circulation·B WidderH Krapf
Oct 1, 1993·Journal of Neurosurgery·H YonasD W Johnson

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