Caggiari Silvia, Toms Martin, Lucie Rehorova, Evans Zara, Gordon Ralph, Muckelt Paul, Mbithi Florence, Filingeri Davide, Worsley Peter R
PressureLab, Skin Sensing Research Group, School of Health Sciences, the University of Southampton, Southampton, UK.
LINET spol. s r. o., Slaný, Czech Republic.
Int Wound J. 2025 Jun;22(6):e70703. doi: 10.1111/iwj.70703.
High specification mattresses periodically redistribute pressure using alternating air cells, offloading tissues. This study aimed to evaluate the effects of alternating air pressure gradients on sacral tissue physiology. This randomised cross-over study recruited 15 healthy participants to test the three mattress settings (fast cycle, normal cycle, and slow cycle). Participants were asked to adopt supine, lateral, and high sitting (head of bed at 40°) postures, whilst transcutaneous tissue gas tensions and interface pressures at the sacrum were continuously monitored. Comparison between mattress settings and postures showed no statistical difference (p > 0.05) between peak pressure index values at the sacrum for each air inflation cycle speed setting. By contrast, a significantly higher sacral (p < 0.05) contact area was observed for high sitting. During high sitting, ischemic responses during both fast and normal air inflation cycle speed settings were recorded. During the slow air inflation cycle speed, most participants (60%-100%) showed high levels of perfusion. The present study identified a main effect of posture on interface pressure and perfusion over the sacrum. The alternating mattress speed influenced local tissue perfusion, with the greatest changes in tissue oxygenation occurring in a high-speed setting.
高规格床垫通过交替气室定期重新分配压力，减轻组织压力。本研究旨在评估交替气压梯度对骶部组织生理的影响。这项随机交叉研究招募了15名健康参与者，以测试三种床垫设置（快速循环、正常循环和慢速循环）。参与者被要求采取仰卧、侧卧和高坐姿（床头抬高40°）姿势，同时连续监测骶部的经皮组织气体张力和界面压力。床垫设置和姿势之间的比较显示，每种充气循环速度设置下骶部的峰值压力指数值之间无统计学差异（p>0.05）。相比之下，高坐姿时观察到骶部接触面积显著更大（p<0.05）。在高坐姿期间，记录了快速和正常充气循环速度设置下的缺血反应。在慢速充气循环速度期间，大多数参与者（60%-100%）显示出高水平的灌注。本研究确定了姿势对骶部界面压力和灌注的主要影响。交替床垫速度影响局部组织灌注，在高速设置下组织氧合变化最大。
