title: Relationship of abdominal pressure and body mass index in men with LUTS.
abstract: OBJECTIVE
  In the development of a non-invasive method for estimating isovolumetric intravesical pressure (pves,isv) we looked for a relationship between intra-abdominal pressure (pabd) and general build, expressed as body mass index (BMI) in men with lower urinary tract symptoms (LUTS).
  
  
  METHODS
  In 100 consecutive male patients undergoing an invasive pressure flow study (PFS) the pabd was recorded continuously during filling and voiding. The magnitude at four set points was measured: before filling, after filling, during voiding and at the end of voiding. Patients' weight (kg) and height (m) were also recorded and their BMI (weight/height(2)) was calculated.
  
  
  RESULTS
  During the fill/void cycle pabd increased during bladder filling from 37 +/- 7 cm H2O (mean +/- SD) to 38 +/- 8 cm H2O, fell during voiding to 35 +/- 9 cm H2O before increasing to 36 +/- 8 cm H2O at the end of voiding. There was a clear relationship between the individual values of pabd and BMI (correlation co-efficient = 0.52) and to a lesser extent weight (correlation co-efficient = 0.42). The relationship with BMI was clarified by separating the subjects into groups of normal, overweight and obese.
  
  
  CONCLUSIONS
  A clear relationship between BMI and pabd was demonstrated, but because of the difficulties in quantifying it for an individual, it is impractical to apply an adjustment to non-invasive estimates of pves,isv.
authors.affiliation: Department of Urology, Freeman Hospital, Newcastle upon Tyne, United Kingdom.
authors.forename: Stuart
authors.initials: S
authors.lastname: McIntosh
authors.forename: Michael
authors.initials: M
authors.lastname: Drinnan
authors.forename: Clive
authors.initials: C
authors.lastname: Griffiths
authors.forename: Wendy
authors.initials: W
authors.lastname: Robson
authors.forename: Peter
authors.initials: P
authors.lastname: Ramsden
authors.forename: Robert
authors.initials: R
authors.lastname: Pickard
mesh_terms: D000005:Abdomen / Q000502:physiology*; D000328:Adult; D000368:Aged; D001827:Body Height / Q000502:physiology; D015992:Body Mass Index; D001835:Body Weight / Q000502:physiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000150:complications / Q000503:physiopathology; D011312:Pressure; D001743:Urinary Bladder / Q000502:physiology; D014554:Urination / Q000502:physiology; D014563:Urodynamics / Q000502:physiology; D014570:Urologic Diseases / Q000503:physiopathology*