Isopotential surface maps.
D000328:Adult; D000375:Aging; D006332:Cardiomegaly / Q000175:diagnosis; D002648:Child; D004562:Electrocardiography; D006321:Heart / Q000502:physiology*; D006344:Heart Septal Defects, Atrial / Q000175:diagnosis; D006801:Humans; D014672:Vectorcardiography