the initial qrs in the frontal plane is downward

presentation advertising screenshot multimedia downward directed positive recorded document initial frontal diagram drawing cartoon vector system circle sketch plane leads brand lead wave 1776 line font text plan logo qrs iii avf map excitement graphic inferior leads system limb wave vectorcardiogram loop vector plane ecg ecg education recording heart heartbeat segment interval left ventricle right interventricular septum rhythm cardiology electrocardiography bundle branch purkinje fibers electrodes monitoring action potentials analysis beat cardiac cardiogram care diagnosis disease ekg electrocardiogram electrocardiograph graph health healthy