Philippe Chevalier

1 INTRODUCTION The electrocardiographic diagnosis of left ventricular hypertrophy (ECG-LVH) has a long history. The ECG changes in a patient with left ventricular hypertrophy (LVH) were described 117 years ago by Einthoven in 1906 (Einthoven, 1957). He drew attention to the distinctive finding—the increased QRS amplitude in the “left hand to left foot lead” (i.e., lead III). Since then, the increased QRS amplitude has been considered pathognomonic sign of LVH.