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Greetings! I am a new member, and have been following the posts regarding deep air vs. Trimix and Heliox. I have to admit that I am almost afraid to raise my hand. I have been doing dives in the range of 130fsw-200fsw in Carmel Bay, Calif.. Typically our bottom times are 15-20min, with about 35-45 min. deco. I carry a set of doubles, and sling 50/50 and 80/20. I switch to the 50/50 at 60fsw and the 80/20 at 25fsw. All our dives are done on a line that is dropped with a bottom finder prior to the dive. *** I accept that Helium prevents narcosis, and that diving drunk is risky! *** WHAT ABOUT PHYSIOLOGY? I am particularly interested if there are any differences in the physiological risks to the body at depth with He vs. N2. Are maladies such as Neurological Damage and/or Dysbaric Osteonecrosis the result of vascular damage caused by micro bubbles ( He or N2), -or does the slugging of RBCs secondary to the effects of high ppn2s cause the damage to the tissue? What if any are the differences in physiological risks that He and Nitrogen have to capillary beds when used in a bottom mix? David Horne DVM ------------------------------------------------------------------------------ --------------------------- --Oh and George, why would I need to take a dog down with me when I have you? Your are the prototypical Pavlov's dog. All anyone has to do is ask you a question about this stuff and you come out a snappin and a snarlin. Maybe your doctor can prescribe a drug to help you with your problem! You don't know me or where I come from as a waterman. We all started breathing air! Were you born breathing He mixtures? My question was a serious one. Are the medical risks associated with deep diving a result of the effects of high gas pressures and micro bubbles, or the individual gasses and their effects on the tissues, RBCs, etc.? Are there any Physiological risks that are unique to He? The reason that I am asking these questions stems from my experience with the scuba industry in general. No one seems either willing, or capable of giving you accurate and scientific answers. I was the first in my group to incorporate nitrox, and then deep stops in my diving. I may be the first to incorporate He mixes. However, I have learned that it is best for me to make my own decisions after looking at the relevant scientific information. Are there any knowledgeable divers out there with the heart of a scientist instead of a junkyard dog? Richard Pyle are you there? David Horne DVM -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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