Vectorcardiographic Criteria of Left and Right Ventricular Hypertrophy with the Frank System

Abstract

The vectorcardiogram with the FRANK system in patients with hypertension, aortic in-sufficiency, mitral stenosis, pulmonary emphy-serna and atrial septal defect are collected and the criteria of left and right ventricular hypertrophy are presented. The criteria of left ventricular hypertrophy are as follows: 1) The magnitude of the main QRS vector in horizontal plane over 2.00 mV, and/or 2) The angle of the maximal T vector in horizontal plane over + 70°. The criteria of right ventricular hypertrophy are as follows: 1) Sx/Rx over 0.4, 2) The clockwise inscription or figure of eight of the horizontal T loop, and 3) The angle of the maximal T vector in horizontal plane less than O°. The specific criterion of atrial septal defect is the anterior convexity of the afferent limb of the left sagittal QRS loop.