title: The relation of alternating contractility of the heart to the inotropic effects of rhythm.
mesh_terms: D000818:Animals; D001145:Arrhythmias, Cardiac / Q000503:physiopathology*; D002415:Cats; D004285:Dogs; D004594:Electrophysiology; D006168:Guinea Pigs; D006321:Heart / Q000502:physiology*; D066298:In Vitro Techniques; D011817:Rabbits; D051381:Rats