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FALL 2012
longer decompressions using mixed gas. Thus, it is possible to
state that technical diving itself does not carry a higher risk of
DON as long as decompression rules are strictly obeyed.
Gempp:
Technical diving is theoretically regarded as a risky
practice since divers are exposed to prolonged ongassing
using heliox or trimix, which implies specific but often
empirical decompression procedures. However, in the past
five years only two nonmilitary, noncommercial divers
using trimix were treated for musculoskeletal DCS in our
hyperbaric center. In both cases screening for DON lesions
was negative. There are many reasons for this discrepancy;
principal among them is the small number of subjects.
Is there any justification for screening technical divers
for DON?
Gempp:
At present it is premature to impose systematic
radiological investigations before determining (with future
studies) the real prevalence of asymptomatic DON in this
population. Detection of clotting-factor disorders that may
contribute to the occurrence of DON is promising, but
additional research is needed.
RESEARCH, EDUCATION & MEDICINE
//
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Technical divers may be at greater risk of DON
than recreational divers, but limited sample sizes
make it difficult to say with certainty.