title: Atrioventricular nodal reentrant tachycardia with second-degree AV nodal block.
mesh_terms: D000368:Aged; D001285:Atropine / Q000627:therapeutic use; D004562:Electrocardiography; D005260:Female; D006327:Heart Block / Q000150:complications*; D006329:Heart Conduction System / Q000503:physiopathology; D006801:Humans; D013614:Tachycardia, Paroxysmal / Q000188:drug therapy / Q000209:etiology*
chemical_list: D001285:Atropine