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

Abstract

A study of 45 spatial vectorcardiograms of patients with posterior myocardial infarction revealed a characteristic upward displacement of the early portion of the QRS st-loop. Changes in the later portion of the QRS st-loop may occur as a result of infarction. The possible utilization of such findings in the diagnosis of infarction is discussed.

A Clinical Appraisal of the Vectorcardiogram in Myocardial Infarction

“…In anterolateral infarction, QR complexes in leads V5 and Va6 provided that the Q waves in these leads measured at least 0.03 second in duration. 3. In high lateral wall infarction, Q waves in leads I and aVL, measuring at least 0.03 second in duration, confirmed by the presence of broad Q Angular reference frame for presentation of data in three orthogonal planes.…”

“…Since the findings in the horizontal plane are so typical and so striking, it may be concluded that study of the 0.01-and 0.02-second vectors in the horizontal plane and the direction of rotation are sufficient for the diagnosis of anterolateral wall infarction. 3 clockwise fashion in front of the null-point and then demonstrated a marked reduction from the usual size of the loop with displacement toward the 900 to 2700 axis. Similar rotation and loop configuration was observed in the non-autopsied material.…”