title: Increased excitability of the heart induced by electrical stimulation in the absolute refractory period.
mesh_terms: D000818:Animals; D004285:Dogs; D004558:Electric Stimulation; D006327:Heart Block / Q000503:physiopathology; D006329:Heart Conduction System / Q000502:physiology*; D010138:Pacemaker, Artificial; D013997:Time Factors