Knox R, Cramer M, Fell G, Breslau P, Beach K, Strandness D E
Angiology. 1982 Apr;33(4):268-76. doi: 10.1177/000331978203300407.
The supposition that the lower limb expands uniformly in circumference during venous occlusion has been investigated. The 3 compartments of the calf were found to be expand to differing degrees depending on the volume of muscle within the compartment. The effect of this phenomenon on the measurement of venous outflow and capacitance using an overlapping strain gauge was assessed. When using an overlapping strain gauge, the anatomical site of overlap was found to alter the measured values of outflow and capacitance by as much as 50%. These errors do not arise with strain gauges designed to fit a small range of limb circumferences, so that no overlap occurs. The reproducibility of plethysmography may be enhanced by attention to the site and degree of overlap of gauges which are designed to fit all sizes of limb. Technicians performing venous occlusion plethysmography should be aware of these variations, so that the examination technique can be standardized.
关于下肢在静脉阻塞期间周长均匀扩张的假设已得到研究。发现小腿的三个腔室根据腔内肌肉体积不同程度地扩张。评估了这种现象对使用重叠应变仪测量静脉流出量和容量的影响。使用重叠应变仪时，发现重叠的解剖部位会使流出量和容量的测量值改变多达50%。而设计用于适应小范围肢体周长从而不会出现重叠的应变仪则不会产生这些误差。通过关注设计用于适应各种尺寸肢体的应变仪的重叠部位和程度，可提高体积描记法的可重复性。进行静脉阻塞体积描记法的技术人员应了解这些变化，以便使检查技术标准化。
