title: Developmental changes of the cardiac electric field. I. Early postnatal period in rats.
mesh_terms: D000200:Action Potentials; D000818:Animals; D004566:Electrodes; D005260:Female; D006321:Heart / Q000254:growth & development* / Q000502:physiology; D006339:Heart Rate; D008297:Male; D009929:Organ Size; D051381:Rats; D014672:Vectorcardiography