title: Calcium antagonists: mechanisms of action in arrhythmias.
mesh_terms: D000200:Action Potentials; D001145:Arrhythmias, Cardiac / Q000188:drug therapy / Q000378:metabolism*; D001283:Atrioventricular Node / Q000378:metabolism* / Q000502:physiology; D001693:Biological Transport, Active / Q000187:drug effects; D002118:Calcium / Q000378:metabolism*; D006329:Heart Conduction System / Q000378:metabolism*; D006801:Humans; D009543:Nifedipine / Q000494:pharmacology; D014700:Verapamil / Q000494:pharmacology*
chemical_list: D014700:Verapamil; D009543:Nifedipine; D002118:Calcium