The impact of body position on intra-abdominal pressure measurement: a multicenter analysis

Michael L. Cheatham, Jan J. De Waele, Inneke De Laet, Bart De Keulenaer, Sandy Widder, Andrew W. Kirkpatrick, Adrian B. Cresswell, Manu Malbrain, Zsolt Bodnar, Jorge H. Mejia-Mantilla, Richard Reis, Michael Parr, Robert Schulze, Sonia Puig

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80 Citations (Scopus)


Objective: Elevated intra-abdominal pressure (IAP) is a frequent cause of morbidity and mortality among the critically ill. IAP is most commonly measured using the intravesicular or "bladder" technique. The impact of changes in body position on the accuracy of IAP measurements, such as head of bed elevation to reduce the risk of ventilator-associated pneumonia, remains unclear. Design: Prospective, cohort study. Setting: Twelve international intensive care units. Patients: One hundred thirty-two critically ill medical and surgical patients at risk for intra-abdominal hypertension and abdominal compartment syndrome. Interventions: Triplicate intravesicular pressure measurements were performed at least 4 hours apart with the patient in the supine, 15°, and 30° head of bed elevated positions. The zero reference point was the mid-axillary line at the iliac crest. Measurements and Main Results: Mean IAP values at each head of bed position were significantly different (p < 0.0001). The bias between IAPsupine and IAP 15° was 1.5 mm Hg (1.3-1.7). The bias between IAP supine and IAP30° was 3.7 mm Hg (3.4-4.0). Conclusions: Head of bed elevation results in clinically significant increases in measured IAP. Consistent body positioning from one IAP measurement to the next is necessary to allow consistent trending of IAP for accurate clinical decision making. Studies that involve IAP measurements should describe the patient's body position so that these values may be properly interpreted.

Original languageEnglish
Pages (from-to)2187-2190
Number of pages4
JournalCritical Care Medicine
Issue number7
Publication statusPublished - 1 Jan 2009
Externally publishedYes


  • Abdominal compartment syndrome
  • Intensive care
  • Intra-abdominal hypertension
  • Intra-abdominal pressure
  • Intravesicular pressure
  • Monitoring

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