This electrocardiogram shows left ventricular hypertrophy and left anterior fascicular block. The characteristic features of left ventricular hypertrophy demonstrated here include increased voltage, reflected by the tall R wave in aVL exceeding 11 mm, ST-T abnormalities well seen in this lead as well as leads I, V5 and V6, a prolongation of the QRS interval, and left atrial enlargement, reflected by the wide P wave in lead II and the prominent negative P wave in lead V1. Left anterior fascicular block is manifested by left axis deviation of ≥ -45° and is reflected by the negative QRS in lead II with an rS morphology in lead II.