title: Electrophysiologic studies on Wenckebach structures below the atrioventricular junction.
mesh_terms: D000200:Action Potentials; D000818:Animals; D002118:Calcium / Q000494:pharmacology; D004071:Digitalis Glycosides / Q000494:pharmacology; D004285:Dogs; D006329:Heart Conduction System / Q000187:drug effects / Q000502:physiology*; D006801:Humans; D008839:Microelectrodes; D009538:Nicotine / Q000494:pharmacology; D010507:Periodicity; D011188:Potassium / Q000494:pharmacology; D013328:Strophanthins / Q000494:pharmacology; D016276:Ventricular Function
chemical_list: D004071:Digitalis Glycosides; D013328:Strophanthins; D009538:Nicotine; D011188:Potassium; D002118:Calcium