Bewustzijnsverlies geinduceerd door G-krachten : preventie door training en vroegtijdige waarschuwing
article
G INDUCED LOSS OF CONSCIOUSNESS. PREVENTION BY TRAINING AND EARLY WARNING
An increase in G tolerance can be obtained by executing the anti-G straining maneuver, by using an anti G suit, and by applying assisted positive pressure breathing. An objective assessment of the efficiency of these measures would be important in optimizing training procedures. In addition, an early warning for a threatening G induced loss of consciousness in the aircraft would allow the aviator to take preventive measures in time.
The aim of this pilot study is to describe non-invasive methods for continuous cardiovascular monitoring during G load: the laserdoppler for transcutaneous capillar blood flow, the transcranial doppler for the intracerebral arterial blood velocity, and the finapres for arterial blood pressure. Subjects (n=9) have been tested in the centrifuge, with no G suit protection. Flow and pressure data were sampled with or without the subject performing the straining maneuver; one subject suffered a LOC. Our data indicate that these methods yield an objective measure for the responses of the baroreceptor control system, for cerebral blood flow, and for the effectiveness of G protection. The laserdoppler flow meter is a possible candidate for an early warning system in the aircraft.
An increase in G tolerance can be obtained by executing the anti-G straining maneuver, by using an anti G suit, and by applying assisted positive pressure breathing. An objective assessment of the efficiency of these measures would be important in optimizing training procedures. In addition, an early warning for a threatening G induced loss of consciousness in the aircraft would allow the aviator to take preventive measures in time.
The aim of this pilot study is to describe non-invasive methods for continuous cardiovascular monitoring during G load: the laserdoppler for transcutaneous capillar blood flow, the transcranial doppler for the intracerebral arterial blood velocity, and the finapres for arterial blood pressure. Subjects (n=9) have been tested in the centrifuge, with no G suit protection. Flow and pressure data were sampled with or without the subject performing the straining maneuver; one subject suffered a LOC. Our data indicate that these methods yield an objective measure for the responses of the baroreceptor control system, for cerebral blood flow, and for the effectiveness of G protection. The laserdoppler flow meter is a possible candidate for an early warning system in the aircraft.
Topics
TNO Identifier
6913
Source
Nederlands Militair Geneeskundig Tijdschrift, 42(Oktober), pp. 151 - 155.
Pages
151 - 155