STUDIES ON THE ESTIMATION OF CARDIAC OUPTUT IN MAN, AND OF ABNORMALITIES IN CARDIAC FUNCTION, FROM THE HEART'S RECOIL AND THE BLOOD'S IMPACTS; THE BALLISTOCARDIOGRAM

Publisher Website
Google Scholar
Abstract
Apparatus is described for recording the heart''s recoil and the blood''s impacts in man. The vibration properties of the human body interfere, and the record obtained is not an exact reflection of the forces which generated it. However, by using the more reliable part of the curve, and by making certain corrections, satisfactory data are obtained. The amplitude of the ballistic record is a function of the cardiac output, its form depends on the curve of blood velocity in the great vessels. Formulae are derived for estimating the cardiac output from the ballistic record. Estimations of cardiac output by these formulae give results which agree well with those obtained by the improved ethyl iodide method in 28 of 30 cases. When the heart is damaged in animal expts., the form of the ballistic record changes. From such changes of form the type of cardiac damage may be inferred.

This publication has 4 references indexed in Scilit: