Prolongation of the relative refractory period by drugs acting like quinidine; occurrence of propagated spikes in cardiac muscle.
D000200:Action Potentials / Q000187:drug effects; D000639:Amitriptyline / Q000494:pharmacology*; D000818:Animals; D000889:Anti-Arrhythmia Agents / Q000494:pharmacology*; D001572:Benzofurans / Q000494:pharmacology; D002417:Cattle; D003988:Dibenzothiepins / Q000494:pharmacology*; D006352:Heart Ventricles / Q000187:drug effects; D007099:Imipramine / Q000494:pharmacology*; D066298:In Vitro Techniques; D011802:Quinidine / Q000494:pharmacology*; D012756:Sheep; D013565:Sympatholytics / Q000494:pharmacology*; D013997:Time Factors; D016276:Ventricular Function
D000889:Anti-Arrhythmia Agents; D001572:Benzofurans; D003988:Dibenzothiepins; D013565:Sympatholytics; D000639:Amitriptyline; D011802:Quinidine; D007099:Imipramine