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I was surprised to see that DAN had discounted dehydration as a significant risk factor. It's always good to stay hydrated for any activities, but it's not the common cause of bends we used to think. I know that Dr.P and many other chamber docs still mention it, but then their focus is not really to determine the why of a hit, but to treat for resolution - which of course you received.I was just diving. Five other people had the exact same profile as I did over a two day span. All dives were nitrox. mixes were tested, and the dives were well within limits of the most conservative computer. I took the hit, everyone else was fine and continued their diving. I exercise 3-4 times weekly , I am not obese and I am in my 50's. I was probably less hydrated than I should have been.
No one knows why you were hit on such benign diving, and there is just nothing there to even suggest it? It just happens at times, rarely - but many hits are unexplained. There currently a lot of debate on PFOs but that is far from settled. It would probably be a good idea to get with a dive doc at DAN or Duke, send them copies of all of your records and your computer profiles, and see if they find anything missed before.
As I said, I saw a lady take a worse hit in Coz once, from pretty casual first day diving, and no one could ever find a reason for it - not the docs in Coz, Miami ICU where she went next, DAN or Duke, just unexplained, and she didn't wake up for weeks. Caca happens.