title: In vivo myocardial excitability studied by simultaneous electrocardiogram and electrogram.
mesh_terms: D000818:Animals; D004285:Dogs; D004558:Electric Stimulation; D004562:Electrocardiography; D004576:Electromyography; D005071:Evoked Potentials; D006321:Heart / Q000502:physiology*; D006329:Heart Conduction System / Q000502:physiology; D011690:Purkinje Fibers / Q000502:physiology; D012032:Refractory Period, Electrophysiological