Faculty Collaboration Database

The use of thoracic impedance for determining thoracic blood volume changes in man. Aviat Space Environ Med 1986 Jan;57(1):49-53

Date

01/01/1986

Pubmed ID

3942570

Scopus ID

2-s2.0-0022653845 (requires institutional sign-in at Scopus site)   101 Citations

Abstract

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.

Author List

Ebert TJ, Smith JJ, Barney JA, Merrill DC, Smith GK

Author

Thomas J. Ebert MD, PhD Adjunct Professor in the Anesthesiology department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

Adult
Blood Volume
Cardiography, Impedance
Humans
Leg
Male
Middle Aged
Plethysmography
Posture
Thorax