title: Semi-recumbent position and body mass percentiles: effects on intra-abdominal pressure measurements in critically ill children.
abstract: OBJECTIVE
  Patient position and body mass index (BMI) affect intra-abdominal pressure (IAP) measured by the intra-vesical method in adults. We sought to determine effects of patient position and BMI on IAP in children because accurate measurement and interpretation of IAP are important for patient management.
  
  
  METHODS
  Seventy-seven mechanically ventilated children (<18 years) admitted to a PICU were prospectively studied. IAP was taken with the head of the bed at 0 degrees and 30 degrees every 6 h over a 24-h period. Statistical methods included descriptives, univariate statistics to identify potential confounding variables and multivariable analysis to assess the impact of position on IAP after adjusting for the significant covariates.
  
  
  RESULTS
  Seventy-seven patients had 290-paired IAP measurements. Mean IAP at 30 degrees was 10.6 +/- 4.0 compared to 8.4 +/- 4.0 at 0 degrees , which was significantly higher (p = 0.026) even after adjusting for age, gender and length. There was no correlation between IAP and actual BMI or BMI percentiles.
  
  
  CONCLUSIONS
  Patient position should be considered when interpreting IAP. BMI did not influence IAP measurements in children.
authors.affiliation: Department of Pediatrics, School of Medicine, Loma Linda University, 11175 Campus Street, Suite A1117, Loma Linda, CA 92354, USA. jejike@llu.edu
authors.forename: Janeth Chiaka
authors.initials: JC
authors.lastname: Ejike
authors.forename: Jose
authors.initials: J
authors.lastname: Kadry
authors.forename: Khaled
authors.initials: K
authors.lastname: Bahjri
authors.forename: Mudit
authors.initials: M
authors.lastname: Mathur
mesh_terms: D000005:Abdomen; D015992:Body Mass Index; D002648:Child; D016638:Critical Illness; D005260:Female; D006801:Humans; D008297:Male; D009102:Multiple Organ Failure / Q000453:epidemiology / Q000503:physiopathology; D011187:Posture; D011312:Pressure; D012121:Respiration, Artificial