clockwise rotation

electrocardiography electrocardiogram interventricular atrioventricular anatomyclockwise counterclockwise transition anatomical cardiology sinoatrial electrodes monitoring clockwise exceeding education recording heartbeat amplitude ventricle rotation waveform interval purkinje coronary medicine thoracic graphic segment disease medical refers artery atrium septum rhythm bundle branch fibers bottom chest human heart right guide aorta lead left body wave rate node long axis apex ecg qrs