CHAPTER 21 Recompression Therapy
Change A 21-45
Treatment Table 8
Enter the table at the depth which is exactly equal to or
next greater than the deepest depth attained in the
recompression. The descent rate is as fast as tolerable.
The maximum time that can be spent at the deepest
depth is shown in the second column. The maximum time
for 225 fsw is 30 minutes; for 165 fsw, 3 hours. For an
asymptomatic diver, the maximum time at depth is 30
minutes for depths exceeding 165 fsw and 2 hours for
depths equal to or shallower than 165 fsw.
Decompression is begun with a 2-fsw reduction in
pressure if the depth is an even number. Decompression
is begun with a 3-fsw reduction in pressure if the depth is
an odd number. Subsequent stops are carried out every 2
fsw. Stop times are given in column three. The stop time
begins when leaving the previous depth. Ascend to the
next stop in approximately 30 seconds.
Stop times apply to all stops within the band up to the next
quoted depth. For example, for ascent from 165 fsw,
stops for 12 minutes are made at 162 fsw and at every
two-foot interval to 140 fsw. At 140 fsw, the stop time
becomes 15 minutes. When traveling from 225 fsw, the
166-foot stop is 5 minutes; the 164-foot stop is 12
minutes. Once begun, decompression is continuous. For
example, when decompressing from 225 feet, ascent is
not halted at 165 fsw for 3 hours. However, ascent may
be halted at 60 fsw and shallower for any desired period
While deeper than 165 fsw, helium-oxygen mixture with
16-21 percent oxygen may be breathed by mask to
reduce narcosis. At 165 fsw and shallower, a HeO2 or
N2O2 mix with a ppO2 not to exceed 3.0 ata may be given
to the diver as a treatment gas. At 60 fsw and shallower,
pure oxygen may be given to the diver as a treatment gas.
For all treatment gases (HeO2, N2O2, and O2), a schedule
of 25 minutes on gas and 5 minutes on chamber air
should be followed for a total of four cycles. Additional
oxygen may be given at 60 fsw after a 2-hour interval of
chamber air. See Treatment Table 7 for guidance.
A high-O2 treatment mix can be used at treatment depth
and during decompression. If high O2 breathing is
interrupted, no lengthening of the table is required.
To avoid loss of the chamber seal, ascent may be halted
at 4 fsw and the total remaining stop time of 240 minutes
taken at this depth. Ascend directly to the surface upon
completion of the required time.
Total ascent time from 225 fsw is 56 hours, 29 minutes.
For a 165-fsw recompression, total ascent time is 53
hours, 52 minutes, and for a 60-fsw recompression, 36
hours, 0 minutes.
Max Time at Initial
Treatment Depth (hours)
Stop TImes (minutes)
Figure 21-12. Treatment Table 8.