title: Physiologic basis of premature beats and sustained tachycardias.
mesh_terms: D000200:Action Potentials; D000818:Animals; D001145:Arrhythmias, Cardiac / Q000503:physiopathology; D005117:Cardiac Complexes, Premature / Q000503:physiopathology*; D004285:Dogs; D004562:Electrocardiography; D004594:Electrophysiology; D006329:Heart Conduction System / Q000502:physiology; D006339:Heart Rate; D006352:Heart Ventricles / Q000294:innervation; D006801:Humans; D007223:Infant; D008564:Membrane Potentials; D012849:Sinoatrial Node / Q000502:physiology; D013610:Tachycardia / Q000503:physiopathology*