the relationship between the maximum qrs potential

frontal plane lead system limb leads r-wave amplitude qrs potential arrowhead 3d ventricular excitation left ventricle right interventricular septum hospital heart rate cardiogram electrocardiogram cardiac electrical activity graph graphic myocardium depolarization electrocardiogram monitoring ecg segment electrocardiograph healthy beat cardiac cardiology diagnosis disease ecg education ekg theory health heart heartbeat medical medicine wave rhythm impulse human