title: Unilateral analgesia following injection of fentanyl into the lumbosacral plexus.
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000698:Analgesia; D005260:Female; D005283:Fentanyl / Q000008:administration & dosage*; D006801:Humans; D007267:Injections; D008160:Lumbosacral Plexus; D010149:Postoperative Pain / Q000188:drug therapy
chemical_list: D005283:Fentanyl