title: Epidural pethidine for post-operative pain relief after upper abdominal surgery.
mesh_terms: D000005:Abdomen / Q000601:surgery*; D000328:Adult; D005260:Female; D006801:Humans; D007268:Injections, Epidural; D008297:Male; D008614:Meperidine / Q000008:administration & dosage*; D008875:Middle Aged; D010149:Postoperative Pain / Q000188:drug therapy*; D011897:Random Allocation
chemical_list: D008614:Meperidine