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---------- Forwarded message ---------- Date: Wed, 20 Sep 1995 03:28:08 -0700 From: Henry Davis <hdavis@ix*.ne*.co*> To: Richard Pyle <deepreef@bi*.bi*.Ha*.Or*> Subject: Re: DCS and injury sites You wrote: > >I followed this exact line of reasoning with my bends doc. He convinced >me that the tissue was slower than anything accounted for by existing >models As I understand the basis for the compartment based models, the compartments do not correspond to any specific tissue oin the body. Instead, you can think of compartments as piecewise approximation of a continuous model. Using compartments makes it easier to compute, but I'm not convinced that it's any easier to discuss than a continuous model. >From the research I've done, there is no correlation between physical location of DCS hits and "violations" of specific compartment gas tensions. In other words, slow compartments don't necessarily correspond to poor circulation tissues. (he may have just been BSing me for, at the time, he was on a >quest to convince me to never dive again). My digestion of it was to >avoid "slow tissue" profiles (i.e., deep dives on many days in a row, >long dives to moderate depths, high exposures to helium, etc.). Mathematically, the slow compartments are the most problematic for decompression. So, if the models are close to mirroring reality avoiding the profiles that you mentioned is the smart thing to do. Lately, >I'm not sure what to believe. Well, if you believe the exponential uptake of gas models reality, then you have at least two alternatives for gas elimination: symetrical offgassing or sub exponential offgassing. I've seen a number of papers that suggest that a linear offgassing model is more appropriate. This has some huge implications for decompression profiles. Henry PS. If you think that this message has general list value, feel free to forward it. -- //////////////////////////////////////////////////////////// /Henry Davis / New Product Consulting / /Henry Davis Consulting / Specializing in product life / /3 Russell Circle / cycle for high tech products. / /Natick, Ma 01760 / Market Segmentation, Product / /ph:(508)651-9122 fax:651-2032 / Definition, Prototyping, / / hdavis@ix*.ne*.co* / Market Readiness, Introduction / ////////////////////////////////////////////////////////////
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