A Study of the Spatial Vectorcardiogram in Subjects with Anterior Myocardial Infarction

Abstract

In 20 subjects with anterior myocardial infarction the early portions of the QRS sÊ-loop were directed away from the area of infarction. Deformities that occurred in later portions of the QRS sÊ-loop were compatible with loss of electric force produced by depolarization of areas activated late in the phase of depolarization. This observation is of significance because electrocardiograms, as conventionally recorded and interpreted, fail to detect infarcts located in areas of the heart that are depolarized late and that would not be expected to deform the early portions of the QRS complex sÊ-loop.