Pressure in the Operating Room: A Potential Contributor to Hospital Acquired Pressure Injuries (HAPIs).

Abstract

Burn patients are at risk for hospital acquired pressure injuries (HAPIs). An unexamined factor that may contribute to HAPI development is the effect of pressure from the operating table during surgery. The purpose of this study was to measure pressure on the buttocks and sacral area during burn surgery under general anesthesia (GA). Prospective study of consecutive adult burn patients admitted to an ABA- verified burn center who required surgery under GA between 06/01/22 and 08/12/22. We studied only cases that were supine, including those with both legs down (LD), one leg suspended (1LU) or both legs suspended (2LU). Interface pressures on the buttocks and sacral area were measured using a commercial sensor mat. Thousands of individual pressure measurements were integrated to show average and peak pressures over repetitive 10-minute intervals during the entire operation. Recordings were completed in 41 procedures among 28 patients (48.3 ± 16.9 yrs, % TBSA burn 19.2 ± 17.1, weight 80.2 ± 19.7kg, BMI 26.7 ± 6.2). Both average pressure (Pave) and peak pressure (Ppeak) increased significantly with greater number of elevated legs (p<0.001). During 2LU periods, Ppeak exceeded 100 mmHg for almost half the operative duration. Pave crept steadily upwards over time and had a positive relationship with weight, regardless of leg elevation. Prolonged moderate to high pressures are exerted on the sacral and buttock areas, especially with one or both legs suspended, during burn surgery. These novel observations suggest that pressure from the operating table could contribute to HAPI development.