title: The effect of nifedipine on the effective refractory period and excitability of the isolated rat atrium at different calcium levels and frequencies of stimulation.
mesh_terms: D000200:Action Potentials / Q000187:drug effects*; D000818:Animals; D002118:Calcium / Q000494:pharmacology*; D004558:Electric Stimulation; D005260:Female; D006325:Heart Atria / Q000187:drug effects; D009200:Myocardial Contraction / Q000187:drug effects*; D009431:Neural Conduction / Q000187:drug effects*; D009543:Nifedipine / Q000494:pharmacology*; D011725:Pyridines / Q000494:pharmacology*; D051381:Rats; D012032:Refractory Period, Electrophysiological / Q000187:drug effects*
chemical_list: D011725:Pyridines; D009543:Nifedipine; D002118:Calcium