title: Electrocardiogram of the month: Rate-dependent second degree AV block.
mesh_terms: D001285:Atropine / Q000627:therapeutic use; D001919:Bradycardia / Q000175:diagnosis; D004562:Electrocardiography; D006325:Heart Atria; D006327:Heart Block / Q000175:diagnosis*; D006339:Heart Rate; D006352:Heart Ventricles; D006801:Humans; D007545:Isoproterenol / Q000627:therapeutic use
chemical_list: D001285:Atropine; D007545:Isoproterenol