By diagnosis

Atrial Abnormalities Atrial Flutter and Atrial Fibrillation AV Block AV junction rhythm Bundle Branch Block Cardiomyopathy Congenital Heart Diseases Effect of Drugs and electrolytes Ischemia Normal variants/artifacts Other Atrial rhythm abnormalities Pacemakers Pericarditis QT Interval Abnormalities Valvular abnormalities Ventricular Arrhythmias Ventricular Enlargement Ventricular Preexcitation Other condition