title: Effect of CO(2) gas warming on pain after laparoscopic surgery: a randomized double-blind controlled trial.
abstract: BACKGROUND
  Previous studies have suggested that gas temperature has an influence on postlaparoscopy pain. This trial therefore was conducted to study the effect of gas warming on pain after upper abdominal laparoscopic surgery.
  
  
  METHODS
  Patients who underwent laparoscopic cholecystectomy, fundoplication, or Heller's myotomy were included and randomly allocated to receive either warm or cold gas. Primary end point was shoulder tip pain, and secondary end points were subcostal, trocar wound, and visceral pains, as well as other postoperative events. Criteria of pain assessment were the visual analog scale, verbal rating scale, and amount of analgesics.
  
  
  RESULTS
  A total of 100 patients were suitable for postoperative evaluation. The groups were well matched. Shoulder tip and subcostal pains were significantly more intense after gas warming (p < 0.05). The three assessment criteria showed the same differences. No difference was observed concerning trocar wound and visceral pains and the other secondary end points. Subdiaphragmatic temperature was not significantly different (34.4 degrees with warming vs. 34 degrees without warming).
  
  
  CONCLUSIONS
  Gas warming does not reduce, and probably increases, postoperative shoulder tip and subcostal pains.
authors.affiliation: Department of General and Digestive Surgery (Centre J. Perrin), Hôtel-Dieu, B.P. 69, F-63003 Clermont-Ferrand, Cedex 1, France.
authors.forename: K
authors.initials: K
authors.lastname: Slim
authors.forename: J
authors.initials: J
authors.lastname: Bousquet
authors.forename: F
authors.initials: F
authors.lastname: Kwiatkowski
authors.forename: G
authors.initials: G
authors.lastname: Lescure
authors.forename: D
authors.initials: D
authors.lastname: Pezet
authors.forename: J
authors.initials: J
authors.lastname: Chipponi
mesh_terms: D002245:Carbon Dioxide; D004311:Double-Blind Method; D006801:Humans; D010535:Laparoscopy; D010149:Postoperative Pain / Q000209:etiology / Q000517:prevention & control*; D011027:Pneumoperitoneum; D011446:Prospective Studies; D012307:Risk Factors; D013696:Temperature
chemical_list: D002245:Carbon Dioxide