title: Prevention of deep vein thrombosis in orthopedic surgery with the combination of low dose heparin plus either dihydroergotamine or dextran.
mesh_terms: D000368:Aged; D003911:Dextrans / Q000627:therapeutic use*; D004087:Dihydroergotamine / Q000627:therapeutic use*; D004359:Drug Therapy, Combination; D005260:Female; D006493:Heparin / Q000008:administration & dosage*; D006622:Hip Prosthesis / Q000009:adverse effects*; D006801:Humans; D007279:Injections, Subcutaneous; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000517:prevention & control*; D011446:Prospective Studies; D013924:Thrombophlebitis / Q000517:prevention & control*
chemical_list: D003911:Dextrans; D004087:Dihydroergotamine; D006493:Heparin