title: Effect of nifedipine on frequency-force relationship in isolated dog left ventricular muscle.
mesh_terms: D000818:Animals; D004285:Dogs; D005260:Female; D006339:Heart Rate / Q000187:drug effects; D066298:In Vitro Techniques; D008297:Male; D009200:Myocardial Contraction / Q000187:drug effects*; D009543:Nifedipine / Q000494:pharmacology*; D011725:Pyridines / Q000494:pharmacology*
chemical_list: D011725:Pyridines; D009543:Nifedipine