“…Those patients with a mean frontal plane QRS axis of -45' or more leftward, and initial right inferior vector with r waves in leads II, III, aVF, and with a Q wave in lead aVL, followed by a left superior vector, were included in this subgroup of patients with left anterior hemiblock. Those patients with left axis deviation with QS complexes and with no terminal R waves in leads II, III, and aVF were accepted as having a combination of an old inferior myocardial infarction and left anterior hemiblock (Rosenbaum et al, 1969a(Rosenbaum et al, , 1970Marriott and Hogan, 1970;Castellanos et al, 1971;Benchimol et al, 1972;Rosenbaum et al, 1972;Schamroth, 1975). Those with left axis deviation but not meeting the criteria for left anterior hemiblock were included in the second subgroup.…”