title: Just when we thought we understood patient-controlled analgesia...
authors.forename: J C
authors.initials: JC
authors.lastname: Rowlingson
mesh_terms: D016058:Analgesia, Patient-Controlled; D019644:Arthroplasty, Replacement, Hip; D006801:Humans; D010100:Oxygen / Q000378:metabolism*; D010149:Postoperative Pain / Q000188:drug therapy*
chemical_list: D010100:Oxygen