We analyzed the relationships between these dynamic parameters and physical characteristics of the participants. 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. Methods: We recruited 21 young, healthy volunteers (11 men and 10 women, aged 21.4☐.5 years). We used this system to investigate the relationship between EP to the sacral region in the lithotomy position and selected physical characteristics. The BIG-MAT ® system is a noninvasive pressure distribution measurement device used to measure external pressure (EP). 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. 1Department of Anesthesiology and Pain Medicine, Juntendo University, Faculty of Medicine, Bunkyo-ku, Tokyo, 2Faculty of Health and Welfare Science, Okayama Prefectural University, Soja-shi, Okayama, Japanīackground: Pressure ulcers (PUs) in the sacral region can be a complication of surgical procedures performed in the lithotomy position.
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