title: [Unusual QRS changes induced by procainamide: ventricular post-excitation].
mesh_terms: D000368:Aged; D001146:Arrhythmia, Sinus / Q000139:chemically induced*; D004562:Electrocardiography; D006801:Humans; D008297:Male; D011342:Procainamide / Q000009:adverse effects*; D013614:Tachycardia, Paroxysmal / Q000188:drug therapy; D014672:Vectorcardiography
chemical_list: D011342:Procainamide
vernacular_title: Procainamid okozta szokatlan QRS változások: "kamrai postexcitatio".