title: Study of retrograde conduction in complete heart block using His bundle recordings.
mesh_terms: D001285:Atropine / Q000494:pharmacology; D006328:Cardiac Catheterization; D004562:Electrocardiography; D006327:Heart Block / Q000503:physiopathology*; D006329:Heart Conduction System / Q000187:drug effects / Q000503:physiopathology*; D006339:Heart Rate; D006801:Humans; D008297:Male; D008875:Middle Aged; D009431:Neural Conduction / Q000187:drug effects; D009434:Neural Pathways; D013268:Stimulation, Chemical
chemical_list: D001285:Atropine