Experimental Analysis of the Rheoencephalogram (REG).

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Abstract
Summary 1. Controlled perfusion of the head of dogs through the common carotid arteries by means of a pump-oxygenator, produces electrical impedance changes. 2. If pulsatile flow is made continuous, these electrical impedance changes disappear. 3. The electrical impedance pulses are independent of pressure and directly related to stroke volume. 4. Since changes of electrical conductivity occur in blood moving in rigid tubing or in a beaker, pulse volume changes may not be the cause of the observed electrical impedance pulses. Therefore, it is suggested that instead of the misleading and cumbersome name of electrical impedance plethysmography, the more general and shorter name of electrical rheography be used.

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