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THE INFLUENCE OF N_2-O-2 AND He-O_2 SATURATION DIVING ON ELECTROENCEPHALOGRAM OF HUMAN BODIESS

Science China Chemistry 1989年第12期32卷 1436-1448页

作者：石中瑗赵德铭梅秀华刘泽人沈同妹 Chinese Underwater Technology Institute Shanghai 200232 PRC

This paper reports the changes of the EEG of human bodies during saturation ex-posure at different depths to different mixed gases. The results of the research show thatthe most obvious on EEG was the appearance of diffused slow waves, usually θ wavesof 4- 7 times/s, and δ waves of 2- 3 times/s within individual subjects. The EEG changesat 50 m were more obvious than those at 36 .5 m. With the prolonging of time under highpressure, the EEG had some improvements, for instance, the slow waves decreased andthe α waves increased. There was a certain relationship between these changes and thesymptoms which appeared in the human body. The chief factor of the EEG changes isdue to the effect of nitrogen narcosis during the oxygen-nitrogen diving experiment. Inaddition, carbon dioxide retention under the high pressure is also a factor of the EEGchanges, because repeated inhaling of CO_2-dense mixtures could aggravate the EEGchanges and the reduction of carbon dioxide in humans by hyperventilation could improveabnormal EEGs. The main changes of the EEG during the helium-oxygen exposure at 302 mwere the increase of θ waves, and even of δ waves, the decrease in α rhythm and thedecline of amplitude of α waves. Increased θ index and decreased α index could be seenat the depth of 302 m. Under any of the above-mentioned pressure conditions when slowwaves characteristic of abnormal changes appeared in the EEGs, the EEGs could be tem-porarily improved by photic stimulation, i.e. slow waves disappeared and a waves reap-peared. When photic stimulation was over, α waves disappeared and slow waves reap-peared. It was indicated that abnormal changes of the EEG under high pressure were akind of temporary and reversible changes of the brain function.

关键词： helium-oxygen nitrogen-oxygen saturation diving electroencephalogram

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