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You wrote: > >joan coval wrote: > >If using nitrox at high altitude, e.g., 12,000 feet above >mean sea level, I would think that the higher partial >pressure of oxygen would contribute toward a greater >possibility of hypoxia when surfacing relative to using >compressed air. What would be other apparent trade- >offs of nitrox vs. air at altitude? Advantages? > ___________________________________reply line__________________________________ > >"A diver surfacing from a dive at altitude is moving from a breathing gas which contains a high oxygen partial pressure to an atmosphere in which the oxygen levels are lower than normal. As a result, the diver may experience symptoms of hypoxia and breathing difficulties for a period of time after the dive. This will be accentuated if the diver has been exerting himself. In this situation, black out after ascent could occur". Quoted from Essentials of Deeper Sport Diving, by John Lippmann. That was written for air. It seems to me, since enriched air, aka nitrox, has an even higher ppO2 than compressed air, that this could exacerbate hypoxia symptoms and therefore breathing difficulties. -Joan- >____________________________________________________________________________ > How would HIGHER ppO2 contribute to hypoxia? I don't think I >understand the question. Are you speaking of the differential ppO2 between >nitrox and air after surfacing at altitude? If this is the case, It shouldn't >matter because the differential would be the same at any given altitude >(0 or 20,000'). > Do you mean the reduction of ppO2 from your tank to the >atmosphere? Don't forget that the atmosphere pressure affects your >overall ppO2. So the reduction in ppO2 would be the same at sea level, >right. As long as the air at the altitude your diving could withstand >life, it would be fine. Please correct me, if I'm off track. > >Aloha, >Tony > >-- >Send mail for the `techdiver' mailing list to `techdiver@terra.net'. >Send subscription/archive requests to `techdiver-request@terra.net'. >
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