Galvanometer Tracings Obtained in a Physico-Chemical Schema Simulating an Electrocardiogram,and the Influence of Membranes on These Records.

Abstract

A schema is described in which interruptions of a direct current of known direction and intensity in the primary circuit are recorded on a string galvanometer which forms part of the secondary circuit. Evidence was presented to show that the apparatus was adequate for the problem concerned. When the nonpolarizable electrodes dip into the open bowl, or when the primary electrodes are enclosed in a collodion membrane, making and breaking of the primary circuit results in a single monophasic deflection, the string maintaining a constant position as long as the key is closed. If the primary electrodes are enclosed in a gelatine coated membrane, a quick deflection occurs when the primary circuit is made and again when it is broken. If the make and break recur rapidly, these quick deflections simulate the QRS of an electrocardiogram. The importance of membrane polarization as a factor causing distortion of electrocardiograms is stressed. A full report is in press. 1