Failure of 4-aminopyridine positive inotropic effect.
D015761:4-Aminopyridine; D000631:Aminopyridines / Q000494:pharmacology*; D000818:Animals; D004285:Dogs; D009200:Myocardial Contraction / Q000187:drug effects*; D013268:Stimulation, Chemical
D000631:Aminopyridines; D015761:4-Aminopyridine