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All doubt you referred to is the reason behind different and numerous studies and tests. Damages have been detected, but difficult to exactly relate to causes. Any mile I drive will damage my car, any day living will have killed some cells in the aftermath. I've been into studies in which we were subjected to inwater compression chamber dives which were monitore whith Doppler, pre/after/after 2 hours blood tests, pre/after respiratory tests. Dives beyond ( 150ft/air)what you would call a normal rec dive. Docs conclusions, no damage done. So , all is relative. The need to worry does not originate in doing a normal dive, but in the intraindividual risk towards diving physiology we carry, and in our very own responsability of knowing ,handling, excluding these risks. Matthias Isaac Callicrate schrieb: > > Something along the same lines as the "every dive is a Deco dive" concept is > that every dive damages the body. Maybe repairable but some damage occurs. > Ideal physiology has gas coming out of the body when pressure is reduced > through normal circulation and respiratory process without any problems. Is > there an ascent rate that is safe for all situations? I think not. I think > that every diver has somewhere in their body that the gas likes to irritate > or hang-up at, causing the immune system results that you read about. To > what level this occurs is somewhat moderated by all the standard DCS > precursors (Cardio-Resp. problems, Obesity, Cholesterol, Body Temp. etc.). > If the damage is minor enough the body deals with it unnoticed except for > some mild lymph node or white blood cell count. The problem is when the body > is isolated from circulatory exchange because of an expanding bubble and > surrounding tissue/system response. Then you can bet your money on no > improvement without hyperbaric oxygen treatment. Ever feel tired on a dive? > More so than equivalent surface exercise? Where to draw the line between > normal post dive exhaustion cause (dehydration, exercise, CO2, Gas Exchange, > body temperature) and possible bubble injury? I think most divers base it on > symptom resolution (take a nap and feel better). Unfortunately if it was DCI > than you are behind the clock. I think it is the same with aches and mild > pains. It might be DCI, but if it resolves without recompression than how do > you know? I think it boils down to diving to a level of risk you are > educated enough to make a decision about. Without the access to doppler, > hyperbaric oxygen, and an intensive care support structure we are increasing > risk significantly. The best you can do to minimize that permanent risk is > if you think you might have a pressure injury, don't wait, call the > appropriate authority. All divers should be insured for, encouraged to use > and have access to hyperbaric treatment. I hope I gave you some answer in > there somewhere. > > >From: wgrogan@dc*.ne* > >Reply-To: wgrogan@dc*.ne* > >To: SRSCHIRATO@BK*.co*, OEA51@go*.co*, icallicrate@ho*.co*, > >techdiver@aquanaut.com > >Subject: Re: RES: Re: [E-CAVERS] BIG Bull and Squeeze > >Date: Tue, 2 Oct 2001 17:23:33 est > > > > >From the message below: > > > > > >"You may be confusing the "oxygen challenge", whatever that is, with a > >test > > > > >>> >of pressure. The test of pressure is done in a chamber when DCS is > > >suspected. > > >>> >If the victim feels better when pressurized to say, 30', then the > >pain > > > > >is > > >>> >probably DCS and NOT something such as overuse or a bruise. If there > >is > > > > >no > > >>> >improvement at 30' or 60', then the problem is NOT DCS. > > > > > >Question: should all DCS symptoms disappear when the victim is > >recompressed > > > > >(therefore eliminating the possibility of DCS if the victim does not show > > >any improvement during the "pressure test")? My question is related to an > > >article about the immune response to bubbles and symptoms of DCS even > >after > > > > >the bubbles were already treated. > > > > > >Regards, Sergio > > > > > >Sergio, > > > >Good question. The answer is that you are on the right track. If the > >symptoms > >go away with O2, then return when O2 is stopped, then its probably DCS. If > >the symptoms go away with recompression, then it is likely to be DCS. > >However, > >the opposite is not true. Think about it, if all DCS symptoms went away > >with > >recompression to 60fsw, then no one who got to a chamber before they died > >would > >have any permanent problem and no one would die after reaching the chamber. > > It simply isn't true. This is one of those situations where you can > >prove > >the positive (DCS) but not the negative (not DCS). > >Wendell > -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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