title: A meta-analysis of the studies of dihydroergotamine plus heparin in the prophylaxis of deep vein thrombosis.
mesh_terms: D000005:Abdomen / Q000601:surgery; D002986:Clinical Trials as Topic; D004087:Dihydroergotamine / Q000008:administration & dosage*; D004359:Drug Therapy, Combination; D005265:Femoral Neck Fractures / Q000601:surgery; D006493:Heparin / Q000008:administration & dosage*; D006622:Hip Prosthesis; D006801:Humans; D010388:Pelvis / Q000601:surgery; D011183:Postoperative Complications / Q000517:prevention & control*; D011897:Random Allocation; D013223:Statistics as Topic; D013903:Thoracic Surgery / Q000009:adverse effects; D013924:Thrombophlebitis / Q000517:prevention & control*
chemical_list: D004087:Dihydroergotamine; D006493:Heparin