Potentiation of the inotropic effects of norepinephrine and dibutyryl cyclic AMP by theophylline.
D000818:Animals; D003994:Bucladesine / Q000494:pharmacology*; D002118:Calcium / Q000494:pharmacology; D002316:Cardiotonic Agents / Q000494:pharmacology*; D002415:Cats; D000242:Cyclic AMP / Q000494:pharmacology; D004357:Drug Synergism; D009200:Myocardial Contraction / Q000187:drug effects; D009638:Norepinephrine / Q000494:pharmacology*; D010210:Papillary Muscles / Q000187:drug effects; D013806:Theophylline / Q000494:pharmacology*
D002316:Cardiotonic Agents; D003994:Bucladesine; D013806:Theophylline; D000242:Cyclic AMP; D002118:Calcium; D009638:Norepinephrine