The relationship between the electrocardiogram and the electrical activity of the heart.
D000200:Action Potentials; D000818:Animals; D004558:Electric Stimulation; D004562:Electrocardiography; D004699:Endocardium / Q000502:physiology; D008962:Models, Theoretical; D010210:Papillary Muscles / Q000502:physiology; D014672:Vectorcardiography; D016276:Ventricular Function