Initial exploration of the body residual nitrogen tension with fast buoyancy ascent escape from the DISSUB following complicated hyperbaric exposure

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Author:
YAO Jian(Naval Medical Research Institute, Shanghai 200433, China)
LIAO Chang-bo(Naval Medical Research Institute, Shanghai 200433, China)
CHEN Rui-yong(Naval Medical Research Institute, Shanghai 200433, China)
Journal Title:
Chinese Journal of Nautical Medicine and Hyperbaric Medicine
Issue:
Volume 18, Issue 05, 2011
DOI:
10.3760/cma.j.issn.1009-6906.2011.05.004
Key Word:
Submarine;Fast buoyancy ascent escape;Escape depth curve;Nitrogen tension;Decompression sickness

Abstract: Objective To discuss the arithmetic of the body residual nitrogen tension with fast buoyancy ascent escape from the DISSUB,following complicated hyperbaric exposure.Methods The processes of fast buoyancy ascent escape were analyzed,the theoretical arithmetic of the residual nitrogen tension in the body at the break of water surface was established with infinitesimal calculus,and the resulting residual nitrogen tension value was converted into corresponding saturation depth.Results The established formula could be used to calculate the residual nitrogen tension in the body at different escape depths,corresponding to saturation depths following saturation at 7 m and 12 m.Conclusions The established theoretical arithmetic could provide reference for the forecasting of DSC and could also provide theoretical evidence for the safety of fast buoyancy ascent escape following complicated hyperbaric exposure.

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