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On Thu, 15 Dec 1994 devon@ol*.ch* wrote: > I don't understand how IWR on pure O2 can make the symptoms worse either > during or after the treatment. Considering that the alternative treatment > is just O2 at 1 atm, how could doing it near 2 atm make things worse? I > am assuing that proper procedures are followed (full face mask, warm suit, > etc), of course. In all 5 cases of detrimental IWR that I am aware of, none followed proper procedures, and all were doing it on air. In 2 cases (the 2 divers off Sussex), nobody knows what happened. In another case, a person who had pain-only symptoms prior to IWR "fixed" those symptoms with IWR, but then later on developed neurological symptoms (would he have got the neurological sooner had he not tried IWR? No way to know, but for the sake of conservatism, I'm classifying this as a detrimental attempt at IWR). Details are very sketchy of the other two cases, but they appear to be the only real examples backing up the "if you try IWR on air you will only add more nitrogen and make things worse" theory against IWR (compare that with over 500 cases of air-only IWR by people who didn't know what they were doing, who successfully reverted symptoms ranging from sore shoulders to unconsciousness/paralysis) > The only thing I can see being a worry is O2 toxicity which, at 9 meters, > seems like a real problem. So what is the best response to an O2 seizure? > Do you abort the procedure and bring the diver up? Switch to air (if this > is even possible)? I'm only aware of a handful of cases involving the use of O2 underwater (i.e., proper protocol), all successful, none involving o2 toxicity problems. Proper protocol mandates the use of a full-face mask. I'm not sure what I would do in the event of a seizure...probably (almost certainly) abort IWR (this is why having a tender could be very important, which might seem contrary to my previous assertion that the tender may be optional). None of the published methods recommend anything in particular. Aloha, Rich deepreef@bi*.bi*.ha*.or*
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