title: Heterogeneous reactivity of atrial and ventricular cardiac contractile tissue [proceedings].
mesh_terms: D000109:Acetylcholine / Q000494:pharmacology; D000818:Animals; D004285:Dogs; D006321:Heart / Q000187:drug effects*; D066298:In Vitro Techniques; D010042:Ouabain / Q000494:pharmacology; D011802:Quinidine / Q000494:pharmacology; D012032:Refractory Period, Electrophysiological / Q000187:drug effects
chemical_list: D010042:Ouabain; D011802:Quinidine; D000109:Acetylcholine