高空减压病的气泡体积假说及预吸氧时间同航天服压力的关系

假定减压病的发病率随减压后气泡的体积增加而增加,可以导出减压后组织中气泡的相对体积(气泡体积同组织体积之比,V_b/V)同减压前后组织氮张力之比(PN_2/Pd_(N2))成线性关系。减压后组织氮张力P_(dN2)可表示为环境压力和综合压力P_(?)之和。P_(?)同减压后的活动状态有关。活动量越大,则P_3越小,使V_b/V 越大,因而减压病的发病率越高。按照该假说以及有关减压病的大量实验资料,得到预吸氧时间同航天服压力的关系曲线。

HYPOTHESIS ON BUBBLE VOLUME OF ALTITUDE DECOMPRESSION SICKNEES AND RELATION BETWEEN O_2 PREBREATHING TIME AND PRESSURE IN SPACE SUITS

Suppose that the increase of the gas bubble volume is bound tobe followed by the increase of the incidence of decompression sickness(DS).It can be deduced that relative volume of gas bubbel in the tissue(the ratiobetween the bubbel volume and the tissue volume,V_b/V)has linear relationto the radio of N_2 tension in the tissue before decompression and that afterdecompression(P_(N2)/P_(dN2)).N_2 tension after decompression(P_(dN2))equals thesum of environmental pressure and synthetic pressure(P_s).P_s depends onactivity level.When the activity level increases,P_s decreases,V_b/V increasesand incidence of SD increases.In accordance with this hypothesis and experi-mental data on SD,the curves of the relation between O_2 prebreathing timeand the pressure in space suits are obtained.