Intraoperative evaluation of cerebral hemodynamics using directional Doppler technique

Abstract

The use of a pulsed Doppler technique during surgical occlusion of intracranial aneurysms [in humans] is described. Saccular aneurysms can be located with reference to probe position and depth setting. Tracings of intra-aneurysmal flow are presented and the characteristic flow pattern is discussed. The parent artery flow is emphasized, particularly the effect of lumen reduction on flow velocity. Results of flow velocity studies on the cognate (direct) and collateral flow in the middle cerebral artery and the proximal anterior cerebral artery are discussed.