title: Patient controlled analgesia: traditional versus mechanical.
mesh_terms: D000698:Analgesia / Q000379:methods*; D003258:Consumer Behavior; D006801:Humans; D009294:Narcotics / Q000008:administration & dosage; D010149:Postoperative Pain / Q000188:drug therapy*; D012646:Self Administration
chemical_list: D009294:Narcotics