The first heart sound and the dynamic events in ventricular ectopic beats and in paced beats.
D001145:Arrhythmias, Cardiac; D006328:Cardiac Catheterization; D004562:Electrocardiography; D005260:Female; D006326:Heart Auscultation; D006352:Heart Ventricles; D006801:Humans; D008297:Male; D008875:Middle Aged; D010138:Pacemaker, Artificial; D010701:Phonocardiography