opyright o The MoGraw-Hill Companies, Ine Permission required for reproduction or display R ECG Q P wave-atrial depolarization QRS complex- ventrical depolarization 20 Ventricular T wave-ventrical repolarization SE四oo action potential 90 0.3• P wave − atrial depolarization • QRS complex − ventrical depolarization • T wave − ventrical repolarization 32