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Accession Number:
ADA191149
Title:
Current and Emerging Technology in G-LOC (G-Induced Loss of Consciousness) Detection: Noninvasive Monitoring of Cerebral Microcirculation Using Near Infrared
Descriptive Note:
Journal article
Corporate Author:
SCHOOL OF AEROSPACE MEDICINE BROOKS AFB TX CREW TECHNOLOGY DIV
Report Date:
1988-01-01
Pagination or Media Count:
6.0
Abstract:
G-induced loss of consciousness G-LOC has emerged as an important operational problem of high-performance aircraft. Since it appears that G-LOC will continue to be a problem, a requirement exists to detect its occurrence in pilots so that the aircraft may be placed on autopilot. One excellent method of detecting G-LOC physiologically, one would assume, would be based on the oxidative status of the brain. This determination can be made noninvasively with an Oxidative Metabolism Near-Infrared monitor using 4 wave lengths OMNI-4. The OMNI-4 is capable of measuring the relative quantities in the brain of hemoglobin Hb, oxygenated hemoglobin HbO2, blood volume BV, and oxidative status of cytochrome c oxidase. This instrument was tested on subjects in the USAFSAM human-use centrifuge at 3, 4, and 5 Gz with onset rates of 1 Gs. Results showed changes within the brain, as expected, during increased G with reductions in Hb, BV, and HbO2. Cytochrome c oxidase measurements were inconclusive. Immediately following G exposure, Hb, BV, and HbO2 overshoots occurred suggesting vasodilation of the cerebral microcirculation. The use of OMNI-4 in the laboratory and is possible role as a detector of G-LOC in pilots are discussed including suggestions for future developments.
Distribution Statement:
APPROVED FOR PUBLIC RELEASE
