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By Professor Dr. med Albert A. Bühlmann (auth.)

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Trial N2'ht min PN2 bar A-Sat. 79 See the profile in Fig. 18. 2 bar for 120 min and decompression with breathing air. 70bar for 180 min (see Tables 10 and 15) trogen is simultaneously released. During the decompression breathing pure oxygen both inert gases are released. During the following interval at the surface breathing air, helium continues to be released and nitrogen is taken up. At reduced ambient pressure both gases are again released. 65 times as fast for a given compartment (Sect. 2).

The values for a and bare listed in Table 8. For compartments 1-9 the same values are valid for both nitrogen and helium, whereas for nitrogen compartments 10-16 have other values because of the lower tolerance of the slow tissues for nitrogen. Figure 7 shows the curves of the 12 pairs of coefficients; the numerical value of a is given by the selected unit of pressure, while b gives the slope of the curves. 1 bar. 934 Factor a, N2 Factorb, N2 If both helium and nitrogen are present in the compartments, factors a and b must be calculated in correspondence with the proportion of the gases, as in the example for compartments 13-16: a (He+ N2) = [(PHe.

The fast initial decompression in extreme dives to 60 m while breathing air in correspondence with the the US Navy procedure is problematic for the tissues with halfvalue times of 12-36 min for nitrogen. Greater safety for the beginning of the decompression, as attained by the Royal Navy and ZH-L12 procedures, requires a longer stay at the last stop at 3m. 29 bar. Thanks to the fast decompression until a depth of 9 m the slow tissues absorb less nitrogen during this phase than they do during the procedure used by the Royal Navy.

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