title: The effect of pneumoperitoneum and Trendelenburg position on respiratory mechanics during pelviscopic surgery.
abstract: BACKGROUND
  Conventional pelviscopic surgery requires pneumoperitoneum with CO(2) gas insufflation and lithotomy-Trendelenburg position. Pneumoperitoneum and Trendelenburg position may influence intraoperative respiratory mechanics in anesthetic management. This study was conducted to investigate the influence of pneumoperitoneum and Trendelenburg position on respiratory compliance and ventilation pressure.
  
  
  METHODS
  Twenty-five patients scheduled for elective gynecologic laparoscopy were evaluated. The patients had no preexisting lung or heart disease or pathologic lung function. Conventional general anesthesia with thiopental sodium, lidocaine, rocuronium, and sevoflurane was administered. The peak inspiratory pressure, plateau pressure, and end-tidal CO(2) were measured before and after creation of pneumoperitoneum with an intraabdominal pressure of 12 mmHg, then after 10 minutes and 30 minutes in the 20° Trendelenburg position, and after deflation of pneumoperitoneum. The dynamic lung compliance was then calculated.
  
  
  RESULTS
  Following creation of pneumoperitoneum, there was a significant increase in peak inspiratory pressure (6 cmH(2)O), plateau pressure (7 cmH(2)O), and end-tidal CO(2) (5 mmHg), while dynamic lung compliance decreased by 12 ml/cmH(2)O. Overall, the Trendelenburg position induced no significant hemodynamic or pulmonary changes.
  
  
  CONCLUSIONS
  The effects of pneumoperitoneum significantly reduced dynamic lung compliance and increased peak inspiratory and plateau pressures. The Tredelenburg position did not change these parameters.
authors.affiliation: Department of Anesthesiology and Pain Medicine, Gangneung Asan Hospital, University of Ulsan College of Medicine, Gangneung, Korea.
authors.forename: Min Kyo
authors.initials: MK
authors.lastname: Suh
authors.forename: Kyu Wan
authors.initials: KW
authors.lastname: Seong
authors.forename: Sung Hwan
authors.initials: SH
authors.lastname: Jung
authors.forename: Seong Su
authors.initials: SS
authors.lastname: Kim