3. Left atrial changes: P terminal wave in V1, amplitude ≥ 1 mm, and duration ≥ 0.04 second. 3. Left axis deviation ≥− 30°. 2. QRS duration ≥ 90 millisecond. 1. Interval between QRS and R-wave peak in V5 or V6 ≥ 0.05 second. 1.

Hypertrophic cardiomyopathy is a genetic disorder that causes the heart’s walls to slightly thicken. It’s a leading cause of sudden cardiac death in young athletes, so it’s important for athletes who have an enlarged heart to make sure they don’t have HCM.

Right ventricular hypertrophy causes large R-waves in right-sided chest leads and deeper S-waves in left-sided leads. Right ventricular hypertrophy (RVH) During normal circumstances, the left ventricle is many times larger than the right ventricles, which is why the QRS complex is dominated completely by left ventricular vectors.