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> The risk of getting bent is well known to all divers; you above all know > this. Risks associated with oxygen toxicity are much less known by sport > divers and have not been inetegrated into their risk assessment. O2 > toxicity from "doing it wrong" is an additional risk to DCS not a > substitute O.K., wait....I thought we were talking about DCS, not O2 toxicity. In either case, my point, I think, still stands; at least for PO2's below about 1.4-1.8 atm. (i.e., chaos is the rule). > I agree with you in general, but the specifics of O2 toxicity are > reasonably well known. Really? Are they? My best guess is some of the stuff about NO, but I don't know how much, if any, has been published. I think we're even further in the dark about CNS O2 toxicity than DCS. > What is not as well known is the degree to which > using a SCR rebreather or other delivery device puts you at risk. The "risks" of these devices are much less phyiological than they are an issue of diver qualification. > Just as > you would not take a regulator of the shelf from some unknown manufacturer > and dive it without backup, it's prudent to take the same precautions when > diving a new life-support system like a rebreather. As I noted - there's a > lot out there both theoretical and experiental (from people like you) from > which we can all learn. Your article about your DCS experience should be > required reading - it personalizes the problem and trancends the "book" > knowledge without actually exposing those learning from you, to the actual > experience. It seems reasonable we coudl all use the same learning curve > about rebreather physiology. It may well not be new - there's a saying in > medicine: If you want to know about a "new" rare disease, check the early > German literature. A rebreather is just a different delivery system - the physiology is the same for both OC and rebreathers (at least as far as DCS and CNS O2 toxicity are concerned). If we are talking about the physiology of DCS and O2 toxicity, then we should be talking about chaos and bubble physics and NO. If we are talking about ways that divers can make mistakes by not being qualified to dive certain gas delivery systems, then we can talk about rebreathers. I see the issues as being distinct. > Safer diving through wiser physiology. aka Know yourself Amen to that!!!!! Aloha, Rich
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