title: A negative inotropic effect of acetylcholine in the presence of several phosphodiesterase inhibitors.
abstract: The phosphodiesterase inhibitors papaverine, theophylline and 3-isobutyl-1-methylxanthine (IBMX) reveal a negative inotropic effect of acetylcholine in cat ventricular heart muscle. This effect in unrelated to beta-adrenoceptor stimulation and possibly mediated by the accumulation of cyclic GMP.
mesh_terms: D015056:1-Methyl-3-isobutylxanthine / Q000494:pharmacology; D000109:Acetylcholine / Q000494:pharmacology*; D000818:Animals; D002415:Cats; D003864:Depression, Chemical; D004305:Dose-Response Relationship, Drug; D009200:Myocardial Contraction / Q000187:drug effects*; D010208:Papaverine / Q000494:pharmacology; D010726:Phosphodiesterase Inhibitors / Q000494:pharmacology*; D013806:Theophylline / Q000494:pharmacology
chemical_list: D010726:Phosphodiesterase Inhibitors; D013806:Theophylline; D010208:Papaverine; D000109:Acetylcholine; D015056:1-Methyl-3-isobutylxanthine