Likewise, when the myocardium is abnormally thickened, and electrical activity takes longer to traverse throughout the whole heart, the duration of the QRS complex may be widened. This is referred ...

Hypertrophic cardiomyopathy (HCM) was first described in the late 1950s as a disease typified by substantial thickening of the myocardium, particularly the left ventricular wall, with no overt cause.