Department of Medical and Health Sciences, Linköping University, Linköping, Sweden.
Microcirculation. 2010 May;17(4):311-9. doi: 10.1111/j.1549-8719.2010.00027.x.
The aim was to investigate the existence of sacral tissue blood flow at different depths in response to external pressure and compression in elderly individuals using a newly developed optical probe prototype.
The tissue blood flow and tissue thickness in the sacral area were measured during load in 17 individuals using laser Doppler flowmetry and photoplethysmography in a combined probe, and digital ultrasound.
The mean age was 68.6 +/- 7.0 years. While loading, the mean compression was 60.3 +/- 11.9%. The number of participants with existing blood flow while loading increased with increased measurement depth. None had enclosed blood flow deep in the tissue and at the same time an existing more superficial blood flow. Correlation between tissue thickness and BMI in unloaded and loaded sacral tissue was shown: r = 0.68 (P = 0.003) and r = 0.68 (P = 0.003).
Sacral tissue is highly compressed by external load. There seems to be a difference in responses to load in the different tissue layers, as occluded blood flow in deeper tissue layers do not occur unless the blood flow in the superficial tissue layers is occluded.
使用新开发的光学探头原型，研究老年人在受到外部压力和压迫时不同深度的骶骨组织血流是否存在。
使用激光多普勒流量仪和光电体积描记术联合探头以及数字超声仪，在 17 名个体中测量骶骨区域的组织血流量和组织厚度在负荷下的变化。
平均年龄为 68.6 +/- 7.0 岁。在加载过程中，平均压缩率为 60.3 +/- 11.9%。随着测量深度的增加，加载时存在血流的参与者数量增加。没有人在组织深部和同时存在更浅层血流的情况下有封闭的血流。未加载和加载的骶骨组织的组织厚度与 BMI 之间存在相关性：r = 0.68（P = 0.003）和 r = 0.68（P = 0.003）。
外部负荷会使骶骨组织高度受压。不同组织层对负荷的反应似乎存在差异，因为除非浅层组织层的血流被阻断，否则深层组织层不会出现封闭的血流。
