NIRS monitoring of pilots subjected to +Gz acceleration and G-induced loss of consciousness (G-LOC)

TY - JOUR

T1 - NIRS monitoring of pilots subjected to +Gz acceleration and G-induced loss of consciousness (G-LOC)

AU - Benni, Paul B.

AU - Li, John K.J.

AU - Chen, Bo

AU - Cammarota, Joseph

AU - Amory, David W.

PY - 2003

Y1 - 2003

N2 - With the increasing maneuverability of modern aircraft, there is an increased frequency of pilots losing consciousness due to high +Gz acceleration. This phenomena is defined as "G-induced loss of consciousness" (G-LOC). We used an NIRS system of our design to monitor cerebral oxygenation changes of pilots subjected to high +Gz acceleration and G-LOC. During the -Gz pulse, ΔHbO2, and ΔTotalHb decreased, with lesser changes of ΔHb. The maximum decrease of ΔHbO2 and ΔTotalHb usually occurred at the onset of G-LOC. After G-LOC, ΔHbO2 and ΔTotalHb increased rapidly for the first few seconds, beginning the reactive hyperemic recovery phase. ΔHbO 2 and ΔTotalHb peaked, and then began to decrease towards baseline. The subjects were unconscious for 3-10 seconds after the onset of G-LOC. Upon returning to consciousness, the subjects were disoriented for another 4-11 seconds. NIRS provides an additional means of studying physiological mechanisms leading to and recovery from G-LOC.

AB - With the increasing maneuverability of modern aircraft, there is an increased frequency of pilots losing consciousness due to high +Gz acceleration. This phenomena is defined as "G-induced loss of consciousness" (G-LOC). We used an NIRS system of our design to monitor cerebral oxygenation changes of pilots subjected to high +Gz acceleration and G-LOC. During the -Gz pulse, ΔHbO2, and ΔTotalHb decreased, with lesser changes of ΔHb. The maximum decrease of ΔHbO2 and ΔTotalHb usually occurred at the onset of G-LOC. After G-LOC, ΔHbO2 and ΔTotalHb increased rapidly for the first few seconds, beginning the reactive hyperemic recovery phase. ΔHbO 2 and ΔTotalHb peaked, and then began to decrease towards baseline. The subjects were unconscious for 3-10 seconds after the onset of G-LOC. Upon returning to consciousness, the subjects were disoriented for another 4-11 seconds. NIRS provides an additional means of studying physiological mechanisms leading to and recovery from G-LOC.

KW - +Gz acceleration

KW - Cerebral oxygenation

KW - G-LOC (G-induced loss of consciousness)

KW - NIRS (Near-Infrared Spectroscopy)

UR - https://www.scopus.com/pages/publications/0242330636

UR - https://www.scopus.com/inward/citedby.url?scp=0242330636&partnerID=8YFLogxK

U2 - 10.1007/978-1-4615-0075-9_34

DO - 10.1007/978-1-4615-0075-9_34

M3 - Article

C2 - 14562732

SN - 0065-2598

VL - 530

SP - 371

EP - 379

JO - Advances in experimental medicine and biology

JF - Advances in experimental medicine and biology

ER -