title: Effects of external calcium, calcium channel-blocking agents, and stimulation frequency on cycle length-dependent changes in canine cardiac action potential duration.
mesh_terms: D000200:Action Potentials / Q000187:drug effects; D000818:Animals; D002118:Calcium / Q000494:pharmacology*; D002121:Calcium Channel Blockers / Q000494:pharmacology*; D002453:Cell Cycle; D003971:Diastole / Q000187:drug effects; D004285:Dogs; D004558:Electric Stimulation; D006329:Heart Conduction System / Q000502:physiology*; D007473:Ion Channels / Q000187:drug effects*; D008345:Manganese / Q000494:pharmacology; D011690:Purkinje Fibers / Q000502:physiology*; D013997:Time Factors; D014700:Verapamil / Q000494:pharmacology
chemical_list: D002121:Calcium Channel Blockers; D007473:Ion Channels; D008345:Manganese; D014700:Verapamil; D002118:Calcium