title: Evaluation of external pressure to the sacral region in the lithotomy position using the noninvasive pressure distribution measurement system.
abstract: BACKGROUND
  Pressure ulcers (PUs) in the sacral region can be a complication of surgical procedures performed in the lithotomy position. Previous reports have noted a difference between men and women in PU development related to the supine position, and body weight and body mass index (BMI) have been also described as known risk factors in supine position-related PU development. The BIG-MAT®system is a noninvasive pressure distribution measurement device used to measure external pressure (EP). We used this system to investigate the relationship between EP to the sacral region in the lithotomy position and selected physical characteristics.
  
  
  METHODS
  We recruited 21 young, healthy volunteers (11 men and 10 women, aged 21.4±0.5 years). Using the BIG-MAT system, we measured four types of EP to the sacral region: box pressure, peak box pressure, contact pressure, and peak contact pressure. We analyzed the relationships between these dynamic parameters and physical characteristics of the participants.
  
  
  RESULTS
  There were no differences between men and women in the four types of EP, and no significant differences related to the participants' height, weight, or BMI.
  
  
  CONCLUSIONS
  An individual's height, weight, and BMI may not contribute to the risk of inducing lithotomy position-related PUs in the sacral region. The noninvasive pressure distribution measurement system BIG-MAT for patients in the lithotomy position during surgery could become a significant device when estimating EP at the sacral region.
authors.affiliation: Department of Anesthesiology and Pain Medicine, Juntendo University, Faculty of Medicine, Bunkyo-ku, Tokyo.
authors.forename: Ju
authors.initials: J
authors.lastname: Mizuno
authors.affiliation: Faculty of Health and Welfare Science, Okayama Prefectural University, Soja-shi, Okayama, Japan.
authors.forename: Toru
authors.initials: T
authors.lastname: Takahashi
keywords: lithotomy position-related pressure ulcer; noninvasive pressure distribution measurement device; peak contact pressure; physical characteristics