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Richard Pyle writes: > >The reason I bring this up in the context of your account is that all of >it follows a somewhat unexpected pattern: two 200fsw dives in a day led >to less DCI incidence than one 200fsw dive followed by one 60-130fsw dive >(with similar levels of conservatism for decompression). Our hypothesis >is that the first dive would cause asymptomatic (or pre-symptomatic) >bubbles. During the interval, the bubbles would grow, but not enough to >cause symptoms. If the second dive was to 200fsw, then the bubbles would >crush back down and resolve, and would not cause subsequent problems (for >obvious reasons, our decompression from the second deep dive was always >*very* conservative). If, however, the second dive was to moderate depth, >the bubbles would not crush enough to resolve, and would instead continue >to grow during the course of the second dive, expanding to symptomatic >bubbles a couple hours later. > Very interesting. I have had this impression that part of my problem may have stemmed from spending a long time in the water during the second dive (as allowed by my computer model). Your account is the first information that I've seen to substantiate the idea. After all, this is contrary to haldanian models (which don't take bubble growth into account). I wonder if any of the non-haldanian models available would support this? Is there anyone out there who has access to non-haldanian models who could check this out? >> After four chamber rides many but not all of my symptoms were gone. Two >> weeks later virtually all of my symptoms were gone. After a months time out >> of the water, I was able to resume regular diving. Now, four months after >> the accident, I feel fully recovered except for occasional short lived pain >> in various parts of my body. > >As you now know, the recovery process does not end with the last chamber >treatment. In my "seroious" bends case, I was not able to walk normally >until about a year after my 30th and final chamber ride. Yes, I believe that I have been slowly getting better over the past few months. Interestingly enough, the short lived pains I feel started a few days after my first dive after the accident (4 weeks later, 35' max, 30 minutes). When I contacted my treating hyperbaric physician, he opinioned that they were not diving related. My regular physician couldn't find anything wrong with me. >> CONCLUSIONS: >> I feel the primary cause was a poor attitude I had about undertaking a >> risky activity. Basically I didn't believe that I would (could?) get bent, >> so didn't take proper precautions. Some contributing factors were: > >I'm very impressed by your honesty. I find it difficult to be honest with >myself about my own flaws, let alone be honest about them publicly. > Actually Richard, you led me to the concept of attitude being the primary cause from your account or your "serious" bends case. I'll have to thank you for writing that. >Thanks again for your honesty, it is much appreciated. I hope I didn't >waste to much bandwidth with my excessively long reply... Your contributions always seem to be useful. Oliver
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