1 / 4

Is the abdominal pressure - inflated volume relation linear?

Is the abdominal pressure - inflated volume relation linear?. Jan Paul Mulier, MD PhD (1), Bruno Dillemans, MD (2) Department of Anaesthesiology Department of surgery, AZ Sint-Jan AV Brugge, Belgium. Goal of the Study.

robertar
Download Presentation

Is the abdominal pressure - inflated volume relation linear?

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Is the abdominal pressure - inflated volume relation linear? Jan Paul Mulier, MD PhD (1), Bruno Dillemans, MD (2) Department of Anaesthesiology Department of surgery, AZ Sint-Jan AV Brugge, Belgium Goal of the Study A pneumoperitoneum with CO2 allows the measurement of the pressure-volume relation (APVR). Is a linear fit (y=mx+b) sufficient as a description? Mulier Linearity of the abdominal P-V relation

  2. Methods and Analysis • 30 patients, ASA class I, II or III, 21 to 75 years, • No previous abdominal intervention. • Scheduled for a laparoscopic surgery. • Approved by the hospital ethical committee. • Anaesthesia was induced with Propofol 200 mg, Sufentanil 20 ug, Nimbex 0,2 mg/kg and Sevoflurane 1,5 Mac in a 50 % O2/N2O. • Bladder empty before surgery. • Stomach emptied by suction through a gastric tube. • All the CO2 was allowed to escape after insertion of the trocar. • An Olympus insufflator UHI-3 gives a stepwise flow of 1 l/min • Measurements were taken every 100 ml till the abdominal pressure reached 15 cmH20. • APVR data were fit by a linear least-squares regression. • An r2 of 0.95 is assumed to be sufficient. Mulier Linearity of the abdominal P-V relation

  3. Results and Discussion A graph shows the APVR and the fitting of the first 10 patients. The table shows the mean and stdv of 30 patients for two parameters a and b with r2 A first order fit is sufficient. Mulier Linearity of the abdominal P-V relation

  4. Conclusion • A linear relation fits all APVR data sufficient. • The abdominal pressure inflated volume relation behaves linear with an elastance and a pressure at zero volume. • This between 0 and 15 cmH20, the pressures used for laparoscopy. Mulier Linearity of the abdominal P-V relation

More Related