Ebert T J, Smith J J, Barney J A, Merrill D C, Smith G K
Aviat Space Environ Med. 1986 Jan;57(1):49-53.
In these studies, strong inferential evidence is provided which suggests that thoracic impedance provides reliable estimates of thoracic blood volume changes in man. There were 24 volunteers studied in 4 different experiments. The results of these studies are as follows: Impedance derived blood volume changes in the calf of man correlate closely with standard estimates of calf blood volume changes made with strain gauge plethysmography. There is a close linear relationship between the increase of thoracic impedance and the increase of calf blood volume during head-up tilt. Volunteers who develop syncope during head-up tilt (presumably due to excessive decreases of central blood volume) demonstrate exaggerated increases of thoracic impedance. Decreases in central venous pressure produced by lower body negative pressure are significantly correlated to thoracic impedance increases.
在这些研究中，提供了有力的推断证据，表明胸阻抗能可靠地估计人体胸部血容量的变化。共有24名志愿者参与了4项不同的实验。这些研究结果如下：人体小腿部通过阻抗得出的血容量变化与用应变式容积描记法得出的小腿血容量变化的标准估计值密切相关。在头高位倾斜期间，胸阻抗的增加与小腿血容量的增加之间存在密切的线性关系。在头高位倾斜期间发生晕厥的志愿者（可能是由于中心血容量过度减少）表现出胸阻抗的过度增加。下体负压引起的中心静脉压下降与胸阻抗增加显著相关。
