title: Patient controlled analgesia.
mesh_terms: D000698:Analgesia / Q000379:methods*; D005283:Fentanyl / Q000008:administration & dosage*; D006801:Humans; D007263:Infusions, Parenteral; D010149:Postoperative Pain / Q000517:prevention & control*
chemical_list: D005283:Fentanyl