Abstract
From the records of the orthogonal 3-lead system of Helm, the polar coordinates of the time-varying spatial heart vector of ventricular activation were calculated. Forty-six patients with clinical conditions which caused isolated left ventricular over-work were compared with 154 normal control subjects. Variation from normal in the group of patients with left ventricular overwork could be divided into two categories: less than normal anterior tilting of the heart vector during the first 40 msec. of ventricular activation, and an increase in the spatial magnitude of the heart vector from 35 msec. to the end of ventricular activation. The results of the study represent the changes in the vector forces derived from the body surface during ventricular activation which occur in isolated overwork of the left ventricle. The difference in result between the orthogonal 3-lead system and the serial 12-lead electrocardiogram appeared to be dependent mostly on the detection of abnormal direction of the heart vector along an anteroposterior body axis for short periods during the initial half of ventricular activation.
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