Cerebral Hemodynamics Revealed by Electrical Impedance Changes

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Abstract
An electrical impedance method was used for detecting pulsatile blood flow in discrete brain areas of unrestrained, unanesthetized cats and other animals. Cortical and subcortical electrical activity, ecg, and systemic arterial pressure were also monitored simultaneously. The selective vasodilation in the hypothala-mus characteristic of ecg and behavioral arousal was independent of arterial pressure changes. Conventional cerebrovascular responses were also demonstrated by this method in a patient having depth electrodes implanted stereotaxically. A direct comparison between the impedance and a standard electromagnetic method was carried out with the impedance electrodes inserted in the blood stream of a major systemic artery. Impedance is a reliable indicator of pulsatile flow velocity and can serve as a valuable tool for studying local vasomotor reactions in the brain.

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