Choosing an optimal headrest for preventing postoperative alopecia - A manikin study.

Background: Postoperative alopecia is a rare complication after surgery. The etiology is thought to be pressure-induced hair follicles ischemia caused by prolonged immobilized head. Headrest is always used as head positioner during operation. The contact pressure between the head and headrest is believed to be related to the development of postoperative alopecia. The aim of this study was to find a headrest with the minimum contact pressure.

Methods: Five different materials headrests - folded sheet, foam donut, gel donut, natural latex, and memory foam were examined. The contact pressures between the manikin's head and tested headrests were continuously recorded for 4 h using CONFORMat System sensor. The average and peak pressures over the contact area were measured at 15 min, 30 min, 45 min, 1 h, 2 h, 3 h, and 4 h. A generalized estimating equations (GEEs) analysis and one way repeated measures ANOVA were used to assess the data.

Results: The memory foam headrest showed the lowest average and peak contact pressures over the contact area (p < 0.05), and the natural latex headrest, gel donut headrest, foam donut headrest, and folded sheet headrest revealed increase of the contact pressures in order. The peak contact pressure of the gel donut headrest at 4 h was significantly higher than that of at 15 min (p = 0.032) and 30 min (p = 0.037).

Conclusion: Of the five headrests we examined, the memory foam headrest is suggested to be the best choice for surgical patients because of its lowest contact pressure.