Correlation Between the Vectorcardiogram and Biplane Angiocardiographic Findings "Relationship Between the Mean Electrical Axis and the Half Area Long Axis of the Left Ventricle"

In this paper, the correlation between the maximal QRS vector or the mean electrical axis by Frank lead system and the maximal long axis or the half area long axis of the left ventricle obtained by biplane angiocardiogram in the frontal and left sagittal planes in thirty patients with various heart diseases were studied. Cases with marked ventricular hypertrophy or abnormalities in the intraventricular conducting pathways were excluded as much as possible. Compared to contemporary studies the approach utilized by the present authors appears to be more favorable, viz; (1) the mean electrical axis was calculated from the corrected orthogonal lead system, (2) the anatomical position of the left ventricle was measured exactly and minutely from the angiocardiogram in the frontal and left sagittal planes, and (3) the end-diastolic volume and the wall thickness of the left ventricle were determined from the left ventriculogram in order to assess the grade of left ventricular hypertrophy, while pressure measurements in the right heart chambers detected right ventricular hypertrophy.