Goossens R H, Zegers R, Hoek van Dijke G A, Snijders C J
Erasmus University Rotterdam, Faculty of Medicine, Department of Biomedical Physics and Technology, The Netherlands.
Clin Physiol. 1994 Jan;14(1):111-8. doi: 10.1111/j.1475-097x.1994.tb00495.x.
Since the early studies on decubitus many authors expect significant influence of shear on decubitus risk. In the study described here skin oxygen tension at the sacrum was measured with combined pressure and shear stress on a young healthy population (mean age 25.5 years, SD 3.4 years). Cut-off pressure is defined as the level of external pressure exerted on the skin at which the skin oxygen tension is 1.3 kPa. At this level ischaemia of the skin can be expected (Bar, 1988). A mean cut-off pressure of 11.6 kPa was found when no shear stress was applied vs. a significantly lower mean cut-off pressure of 8.7 kPa with a shear stress of 3.1 kPa. No significant relationship was found between cut-off pressure and systolic blood pressure, diastolic blood pressure, skin thickness at the sacrum, percentage of fat and skin oxygen tension in the unloaded situation.
自早期关于褥疮的研究以来，许多作者预计剪切力对褥疮风险有重大影响。在此描述的研究中，对年轻健康人群（平均年龄25.5岁，标准差3.4岁）施加联合压力和剪切应力，测量其骶骨处的皮肤氧张力。临界压力定义为施加在皮肤上的外部压力水平，此时皮肤氧张力为1.3 kPa。在这个水平下，预计会出现皮肤缺血（Bar，1988）。未施加剪切应力时，平均临界压力为11.6 kPa，而施加3.1 kPa的剪切应力时，平均临界压力显著降低至8.7 kPa。在未加载情况下，临界压力与收缩压、舒张压、骶骨处皮肤厚度、脂肪百分比和皮肤氧张力之间未发现显著关系。
