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《Space Medicine & Medical Engineering》 1990-04
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The Evaluation of Tolerance to Serious Acute Hypoxia in Humans

Xia in Humans/Xu Guolin et al (Institute of Space Medico-Engineering,Beijing)  
15 young men breathed gas mixture containing 7.1% oxygen thatsimulated hypoxia at 7500m altitude to examine the tolerane to hy-poxia.Time of useful consciousness (TUC) was measured with a me-thod of letting the subjects count cown by writing while recording theirvigil EEGs.We found that the ti e when paroxysmal wave trains oflong range and high amplitude emerged in frontal EEG was close tothe TUC measueed by the method of writing.After the measurementof TUC,as auditory test under simulated hypoxia was conducted.Theaverage response time was twice as much as that of control.At the ter-minal of TUC,the oxygen partial pressure at tidal end in expiredgas was 4.0±0.2kPa.In one minute after that,this partial pressurebecame 3.7±0.2kPa.At this time the subjects could still reply to soundsignals using push botton.The retults were very significant toemergency rescue
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