By Professor Dr. med Albert A. Bühlmann (auth.)
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Extra info for Decompression — Decompression Sickness
The first decompression steps after saturation with helium, as shown in Table 13, are instructive [21, 27]. The rule for decompression after saturation dives that is recommended by the US Navy and also used by the British and French specifies that the rate of decrease in pressure after quickly reaching the first decompression step be dependent on the ambient pressure at an approximately constant partial pressure of oxygen. With this rule the decompression times for dives to great depths are two to three times as long as those with the Zurich system, but these much slower decompressions do not guarantee any greater safety from the occurrence of pains in the joints.
Bar 0 0. t. 9. 5 bar. (See Tables 10 and 15) range are the basis for decompression tables for dives in mountain lakes, but the tables also give guidance on the necessary stay at normal pressure before flying. The combination of overpressure and negative pressure also offers the possibility of testing the use of the linear system. 5 bar for the half-value times of nitrogen of 238, 304, and 503-635 min. For some of these experiments the tolerance for the half-value time of 304 min was exceeded. In 7 of 31 experimental subjects slight, spontaneously vanishing pains in the joints occurred during a stay of 2 h at reduced ambient pressure (see Table 15, Sect.
6. 0 bar. 67 bar, pains in the joints may arise. 30 bar, corresponding to the lengthy exposures to air in experiments A0-320 and AA-320. 3 bar of nitrogen (see Sect. 14). The consideration of the solubility factors of other inert gases shows that for neon about the same tolerance is to be expected as for helium; for hydrogen, a tolerance similar to that for nitrogen; and for the heavy very readily soluble argon, the least tolerance. For the change of gas from helium to a more slowly diffusing gas, neon is preferred to nitrogen, although the gain in decompression time would be slight.
Decompression — Decompression Sickness by Professor Dr. med Albert A. Bühlmann (auth.)