1 / 1

The abdominal pressure - inflated volume relation in pigs

The abdominal pressure - inflated volume relation in pigs. Mulier J.P. 1 , Missant C. 2 , Crombach M. 2 , Vandermeersch E 2 1. Dep of Anesthesia, Sint JAN Brugge-Oostende, Bruges, Belgium , 2. Dep of Anaesthesiology, University hospitals, KULeuven, Leuven, Belgium

doyle
Download Presentation

The abdominal pressure - inflated volume relation in pigs

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. The abdominal pressure - inflated volume relation in pigs Mulier J.P.1, Missant C.2, Crombach M. 2 , Vandermeersch E 2 1. Dep of Anesthesia, Sint JAN Brugge-Oostende, Bruges, Belgium, 2. Dep of Anaesthesiology, University hospitals, KULeuven, Leuven, Belgium Contact Email: jan.mulier@azbrugge.be More info: www.publicationslist.com/jan.mulier Background and Goal of Study • The abdominal pressure inflated volume relation is linear in humans up to 15 mmHg. • Goal of this study was to measure more accurately the abdominal pressure volume relation in pigs during inflation and deflation to a pressure above 15 cmH2O. Results • In all pigs the abdominal pressure volume relation is linear till around 10 cmH20 as shown in table 1. Pig nr linear till 1 11,2 2 10 3 9,3 4 9,1 5 11 6 10,4 7 10,5 Mean 10,2 Discussion • The abdominal pressure volume relation has hysteresis as shown in graph 1 of pig nr 3. Inflation pressures are higher than the deflation pressures. • The respiratory cyclus is seen in the abdominal pressures depending on the abdominal and thoracic pressures. Discussion • Continuous and accurate pressure volume measurements during inflation and deflation of a pig abdomen reveals non linearity above 10 cmH20. Intermittent and continuous measurements in human (fig 2) to 25 cmH2O did show previously linearity up to 15 cmH20. • Pigs have a different abdominal shape/structure making readings above 10 cmH2O different from humans. Materials and Methods • An accurate flow probe (labflow resolution 0,2 ml/sec) was used during inflation and deflation at a flow of 2 L/min. The inflated volume is calculated by integration of the flow while the abdominal pressure is measured with a separate tube in the abdomen at a resolution of 0,1 cmH20. The abdomen is inflated to maximum 20 cmH20. • Five pigs were evaluated in a supine position. The abdominal inflation pressures at end expiration are used for fitting.. • The pressure at which the inflation curve deviates from linear is found as the last added point giving a linear fit with a R2 below 0,95. Conclusion References: 1. Abdominal pressure volume relation in morbid obese patients. Obes Surg 2007; 17:1000 2. Abdominal pressure volume determinants. Crit Care 2007; 11, S2:320 ESA Milan June 8 2009 3 AP 6-5

More Related