Abstract
Internal carotid (IC) flow was monitored in 35 patients during aneurysm surgery using an electromagnetic flowmeter around the carotid artery in the neck. This was advantageous in patients with large aneurysms to reveal internal stenosis or kinking of a related artery, that was not suspected from the surgical observation. It was also useful for control of induced hypotension to prevent ischemic complications, especially for patients with severe SAH (grade III, IV). Autoregulation response, studied before craniotomy, was lost and IC flow severely decreased under mild hypotension. Systemic blood pressure did not always give indications for caution against cerebral ischemia.
