title: Prophylaxis of postoperative thromboembolism: low dose heparin versus heparin plus dihydroergotamine.
mesh_terms: D000368:Aged; D004087:Dihydroergotamine / Q000008:administration & dosage*; D004359:Drug Therapy, Combination; D005260:Female; D006493:Heparin / Q000008:administration & dosage* / Q000009:adverse effects; D006801:Humans; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000517:prevention & control; D013923:Thromboembolism / Q000517:prevention & control*
chemical_list: D004087:Dihydroergotamine; D006493:Heparin