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On Tue, 29 Nov 1994, Prime Rat wrote: > Well, at the risk of labouring the point, and to make any survey usefull > (and I think an anonymous survey might be usefull), what do you define as a > DCI 'hit'? All symptoms ranging from a bit of tingling in the left armpit > to full blown fulminant cerebral DCI producing death? IMO, anyone who wants to conduct a survey about DCI should pay attention to Rat's point. Whenever someone asks me how many times I've been bent, I always reply: "Define Bends". I'd widen the scale even further and ask "Does excessive fatigue after a dive constitute bends?" If you define "bends" as the presence of gas-phase bubbles in the blood and/or tissues, then most of us get "bent" after just about every dive. In fact, you might even find that most of us (divers & non-divers) are ALWAYS in a state of "bent" by this definition. Bends, I think, needs to be defined in terms of symptoms. Different catigorization schemes have been proposed, none of them perfect. Perhaps any potential DCI and/or AGE incidents (SYMPTOMS resulting from gas-phase bubbles in blood and/or tissues) should be qualified by a description of all symptoms, so that people examining survey data can break-up the incidents into whatever categories they wish. The problem, of course, is how to define "symptoms". Only those noticable to the victim? Those that are detectable (by neurological exams, Doppler, etc.)? Tough questions; no easy answers. Best of luck, and I'd be happy to share my own experiences for such a survey. Aloha, Rich deepreef@bi*.bi*.ha*.or*
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