A METHOD FOR THE SIMULTANEOUS RECORDING OF FOCAL CEREBRAL BLOOD FLOW, pH, ELECTRICAL ACTIVITY AND BLOOD PRESSURE
- 31 January 1940
- journal article
- research article
- Published by American Physiological Society in American Journal of Physiology-Legacy Content
- Vol. 128 (3) , 488-492
- https://doi.org/10.1152/ajplegacy.1940.128.3.488
Abstract
A standard set of high gain condenser-coupled amplifiers and ink-writing recorders is used for the measurement of physiological variables expressed or translated into D.C. voltage changes. Focal cortical pH, blood flow, and electrical activity, as well as systemic blood pressure, are used as examples, with illustrations of the effect of adrenaline and hyperventilation. The essential principle consists of a series of quiet mechanical contacts which short circuit the input of the amplifiers at a rate of about 16/sec. D.C. voltage changes of less than 5 microvolts can be measured from a quiet base line.This publication has 1 reference indexed in Scilit:
- A SEARCH FOR CHANGES IN DIRECT-CURRENT POTENTIALS OF THE HEAD DURING SLEEPJournal of Neurophysiology, 1939