Common causes include: normal variation, changes in<unk>  branch structure - such as stretching, chest trauma,<unk>  ventricular hypertrophy or strain, congenital heart disease such as atrial septal defect, and ischemic heart disease. In addition, a<unk>  may also result from Brugada syndrome, pulmonary embolism, rheumatic heart disease, myocarditis, cardiomyopathy, or hypertension. Causes for incomplete<unk>  are exercise-induced<unk>  ventricular remodeling, increased RV free wall thickness, especially in athletes due to prolonged endurance exercise.
Right bundle branch block
Left bundle branch block
Bundle branch block
Sinoatrial block
Pre-excitation syndrome
Atrioventricular block
Sinoatrial arrest
Torsades de pointes