title: Patient-controlled analgesia.
mesh_terms: D000698:Analgesia / Q000295:instrumentation*; D000700:Analgesics / Q000008:administration & dosage*; D000701:Analgesics, Opioid / Q000008:administration & dosage; D004582:Electronics, Medical; D006801:Humans; D007273:Injections, Intramuscular; D007275:Injections, Intravenous; D008328:Man-Machine Systems; D010146:Pain / Q000188:drug therapy*
chemical_list: D000700:Analgesics; D000701:Analgesics, Opioid