title: Prevention of fatal post-operative pulmonary embolism.
mesh_terms: D000925:Anticoagulants / Q000627:therapeutic use; D004087:Dihydroergotamine / Q000627:therapeutic use; D006493:Heparin / Q000627:therapeutic use; D006801:Humans; D011183:Postoperative Complications / Q000517:prevention & control*; D011655:Pulmonary Embolism / Q000517:prevention & control*
chemical_list: D000925:Anticoagulants; D004087:Dihydroergotamine; D006493:Heparin