抄録
To study pathophysiological aspects concerned to functional reversibility of cerebral ischemia, systemic arterial pressure (SAP), blood pressure of superficial temporal artery (STP) and cortical middle cerebral artery (MCP), shunt flow through STA after anastomosis (SF), regional cortical blood flow (rCBF), EEG and somatosensory evoked potentials (SEP) were recorded and analysed during STA-MCA anastomosis. Case materials consist of 4 cases of internal carotid artery (IC) occlusions and 14 cases of middle cerebral artery (MC) occlusions. All cases are completed strokes.
In the improved cases after bypass, MCPs was more than 40 mmHg and early components of SEP were already identified before bypass. After bypass, SF showed high value more than 40 ml / min. with significant augmentation of rCBF and amplitude of N1 of SEP. But, in the unchanged cases, MCP and SF showed lower value and early components of SEPs were not activated after bypass.
MCP is reflected to collateral circulation and SF is related to increase of rCBF after bypassing.
So it is considered that MCP, STP, SF and rCBF are important factors to determine the possibility of the functional reversibility in cerebral ischemia when bypass surgery will be performed.
