title: Comparison of low and standard pressure gas injection at abdominal cavity on postoperative nausea and vomiting in laparoscopic cholecystectomy.
abstract: Background and Objective : Postoperative nausea and vomiting (PONV) is the main concern for 40-70% of patients undergoing laparoscopic cholecystectomy. Our objective was to compare carbon dioxide gas at low pressure and standard pressure for the occurrence of PONV on patients undergoing laparoscopic cholecystectomy.
  
  
  METHODS
  This double- blind trial was conducted on 50 women patients aged between 18 to 60 years with acute cholecystectomy. The patients were divided into two groups: low pressure (LP) (received LP gas, 7-9 mmHg) and standard pressure (SP) (received SP gas, 14-15 mmHg). Nausea and vomiting in patients at hours 0-4, 4-8, 8-12, 12-24 after the surgery were recorded.
  
  
  RESULTS
  The frequency of PONV in the LP and SP groups did not demonstrate statistically significant different (P > 0.05). Nevertheless the frequency of shoulder pain after 4 hours at the LP group compared with SP group was significantly different (P < 0.023).
  
  
  CONCLUSIONS
  The use of low pressure gas compared to standard pressure gas to create pneumoperitoneum could not reduce the PONV whereas the frequency of shoulder pain in LP group was reduced. Low pressure gas was associated with reduction of surgeon visibility and subsequently more prolonged surgery duration.
authors.affiliation: Nozar Nasajiyan MD, Assistant Professor, Dept. of Anesthesiology, Ahvaz Jundishapur University of Medical Science, Pain Research Center, Ahvaz, Iran.
authors.forename: Nozar
authors.initials: N
authors.lastname: Nasajiyan
authors.affiliation: Fatemeh Javaherfourosh MD, v Assistant Professor, Dept. of Anesthesiology, Ahvaz Jundishapur University of Medical Science, Pain Research Center, Ahvaz, Iran.
authors.forename: Fatemeh
authors.initials: F
authors.lastname: Javaherfourosh
authors.affiliation: Ali Ghomeishi MD, Assistant Professor, Dept. of Anesthesiology, Ahvaz Jundishapur University of Medical Science, Pain Research Center, Ahvaz, Iran.
authors.forename: Ali
authors.initials: A
authors.lastname: Ghomeishi
authors.affiliation: Reza Akhondzadeh , Assistant Professor, Dept. of Anesthesiology, Ahvaz Jundishapur University of Medical Science, Pain Research Center, Ahvaz, Iran.
authors.forename: Reza
authors.initials: R
authors.lastname: Akhondzadeh
authors.affiliation: MD, Faramarz Pazyar MD, Assistant Professor, Dept. of Surgery, Ahvaz Jundishapur University of Medical Science, Ahvaz, Iran.
authors.forename: Faramarz
authors.initials: F
authors.lastname: Pazyar
authors.affiliation: Nader Hamoonpou MD, Anesthesiologist, Dept. of Anesthesiology, Ahvaz Jundishapur University of Medical Science, Pain Research Center, Ahvaz, Iran.
authors.forename: Nader
authors.initials: N
authors.lastname: Hamoonpou
keywords: Carbon dioxide; Cholecystectomy; Laparoscopy; Nausea; Pneumoperitoneum; Postoperative period; Pressure; Vomiting