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Publication AbstractsORIGINAL RESEARCHGotshall RW, Davrath LRAviat Space Environ Med 1999; 70:58-61. AbstractBackground: Thoracic electrical impedance (TEI) has been suggested as a means to monitor thoracic fluid changes. It was hypothesized that TEI would correlate significantly with an intrathoracic blood volume (pulmonary capillary blood volume) during postural shifts. Methods: TEI was compared with pulmonary capillary blood volume (V) in six men and six women during postural stress. The diffusion capacity for carbon monoxide (DLCO) was used to determine V. Subjects were supine for 15 min and then stood quietly for 5 min. Measurements were made at the end of each period. Heart rate (HR), stroke volume (SV), and BP were determined for each posture. Results: Women had higher TEI values at rest, confirming previous data. Cardiopulmonary variables change similarly for each gender on standing. TEI correlated significantly with V (p < 0.01), and V was significantly correlated with SV (p < 0.01). Total lung capacity and residual volumes were unchanged with posture. Conclusion: It is concluded that TEI can serve as a useful clinical and research monitor of thoracic fluid volume changes, even small volume changes, and correlates with a measured thoracic fluid compartment.Keywords: impedance plethysmograhy, gender, posture, central blood volume. Information on subscribing, and on obtaining copies of an article or of an entire issue. Table of Contents for Volume 70, Number 1 of the ASME journal.
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