Jan J. De Waele - Latest news on abdominal pressure monitoring – November 17th 2012
Latest news on abdominal pressure monitoring
Jan J. De Waele MD PhDSurgical ICU
Ghent University HospitalGhent, Belgium.
Jan J. De Waele - Latest news on abdominal pressure monitoring – November 17th 2012
IAP monitoring??
Jan J. De Waele - Latest news on abdominal pressure monitoring – November 17th 2012
Introduction• Fluid (over)load important contributor to
IAH• IAH and ACS identified as causes of organ
dysfunction in critical care
• IAP monitoring essential• Sole diagnostic tool
Jan J. De Waele - Latest news on abdominal pressure monitoring – November 17th 2012
Mon
itor I
AP•
Low
inde
x of
su
spic
ion
Prevent IAH• Operating theatre• Judicious fluid resuscitation • Open abdomen treatment
Medical management•IAP reducing strategies•Incorporate IAH in patient
management
Surgical m
anagemen
t•W
hen IAP>25m
mH
g•
Fulminant
deteriorationIAH management
in the ICU
Jan J. De Waele - Latest news on abdominal pressure monitoring – November 17th 2012
IAP measurement
Jan J. De Waele - Latest news on abdominal pressure monitoring – November 17th 2012
IAP measurement basics
Supine positionNo muscle contractionsOnly 25mL or lessTransvesicular approach
Jan J. De Waele - Latest news on abdominal pressure monitoring – November 17th 2012
Femoral vein pressure?
De Keulenaer BL, Intensive Care Med 2011
FVP cannot be used as a surrogate measure of IAP unless IAP is above 20 mmHg.
Jan J. De Waele - Latest news on abdominal pressure monitoring – November 17th 2012
What is normal IAP?• Normal IAP 5-7mmHg• Effect of body weight?
Jan J. De Waele - Latest news on abdominal pressure monitoring – November 17th 2012
IAP and HOB positioningMost patients are nursed in 30-45°HOBEffect of positioning?
Jan J. De Waele - Latest news on abdominal pressure monitoring – November 17th 2012
IAP and prone positioning
• Zero reference level?• Abdominal support
Jan J. De Waele - Latest news on abdominal pressure monitoring – November 17th 2012
IAP and PEEP
Jan J. De Waele - Latest news on abdominal pressure monitoring – November 17th 2012
Pitfalls
Zero reference level• Inter-observer
differences• Mark the IAP
reference level on the patient!
Jan J. De Waele - Latest news on abdominal pressure monitoring – November 17th 2012
Pitfalls
Mass lesions in the pelvis – external compression
Jan J. De Waele - Latest news on abdominal pressure monitoring – November 17th 2012
The abdomen as a hydraulic system
Is the abdomen a liquid filled container?
Jan J. De Waele - Latest news on abdominal pressure monitoring – November 17th 2012
IAP determinants
Gravity
Solid organs, fluid and gasRelevantDependent on volume and densityPascal’s law
Wall tension
• Abdominal wall + diaphragm• Relevant if compliance is low
Jan J. De Waele - Latest news on abdominal pressure monitoring – November 17th 2012
IAP determinants
Gravity Wall tension
Jan J. De Waele - Latest news on abdominal pressure monitoring – November 17th 2012
IAP
High compliance
Jan J. De Waele - Latest news on abdominal pressure monitoring – November 17th 2012
IAP
Low compliance
Jan J. De Waele - Latest news on abdominal pressure monitoring – November 17th 2012
So what?
Jan J. De Waele - Latest news on abdominal pressure monitoring – November 17th 2012
Explains organ dysfunction dynamics in IAH
First symptoms→ Kidney→ Hemodynamics
Later→ Respiratory
Jan J. De Waele - Latest news on abdominal pressure monitoring – November 17th 2012
Explains effect of positioning
Effect of HOB elevation?
IAP 16
Jan J. De Waele - Latest news on abdominal pressure monitoring – November 17th 2012
Explains effect of positioning
Effect of HOB elevation?
Jan J. De Waele - Latest news on abdominal pressure monitoring – November 17th 2012
Predicts effect of therapy
Role of abdominal decompression→ = increase in compliance of abdominal wall
Jan J. De Waele - Latest news on abdominal pressure monitoring – November 17th 2012
Conclusion• IAP measurement established
• IAP determinants• Pitfalls
• IAP measurement is simple• Effect of ICU interventions on IAP minimal
• Be careful when proning• New paradigms for *unexplained*
observations and therapy
Jan J. De Waele - Latest news on abdominal pressure monitoring – November 17th 2012
Thank you for your attention
Email: [email protected]: @JanDeWaeleMD