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#1
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Bill Daniels wrote:
At 16,000 ft., I can't tell the difference with or without O2. Unfortunately, feeling fine can be one of the first symptoms of hypoxia. How you FEEL means little. The only quantitative measure of hypoxia is a pulse oxymeter. Borrow one the next time you fly. The numbers will likely surprise you. Since he feels (or at least "can't tell the difference") the same with and without oxygen, are you suggesting he was hypoxic without the oxygen but just couldn't tell that he was functioning differently than with the oxygen? I often do a similar test when flying with oxygen: I go to 100% for a couple of minutes; if I then still feel the same and my decisions still seem sensible, I assume I've been getting enough oxygen. Does seem like an adequate test for altitudes up to 25,000', the highest I've gone? I've not used an oximeter, so I don't know what my readings are before or after. -- Change "netto" to "net" to email me directly Eric Greenwell Washington State USA |
#2
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Thank you Eric.
I didn't say I felt fine, I said I can't tell the difference. Above about 20,000 ft or so, I can tell the difference. I start to get a headache and my ears tingle. In addition, even at lower altitudes, if I divert blood from my brain, (how does he do that, you ask?) by eating a sandwich or the like, I have to get on O2 immediately. I can really tell the difference. No Bill, I am not a Sherpa and I can't quarrel with the acclimatization point. I can only tell you what I experience. There is no such thing as too much education and/or knowledge, so I can't disagree with you there. I haven't gone over 26,000 ft so my descriptions are only valid - for me - up to that altitude. I'm not really disagreeing with what you say, only with the thought that regulations are required to make it work. All the regulations in the world have not stopped stall-spin accidents. How about we work on that one? Allan "Eric Greenwell" wrote in message ... Bill Daniels wrote: At 16,000 ft., I can't tell the difference with or without O2. Unfortunately, feeling fine can be one of the first symptoms of hypoxia. How you FEEL means little. The only quantitative measure of hypoxia is a pulse oxymeter. Borrow one the next time you fly. The numbers will likely surprise you. Since he feels (or at least "can't tell the difference") the same with and without oxygen, are you suggesting he was hypoxic without the oxygen but just couldn't tell that he was functioning differently than with the oxygen? ...Snip.... |
#3
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![]() "ADP" wrote in message ... Thank you Eric. I didn't say I felt fine, I said I can't tell the difference. Above about 20,000 ft or so, I can tell the difference. I start to get a headache and my ears tingle. In addition, even at lower altitudes, if I divert blood from my brain, (how does he do that, you ask?) by eating a sandwich or the like, I have to get on O2 immediately. I can really tell the difference. No Bill, I am not a Sherpa and I can't quarrel with the acclimatization point. I can only tell you what I experience. There is no such thing as too much education and/or knowledge, so I can't disagree with you there. I haven't gone over 26,000 ft so my descriptions are only valid - for me - up to that altitude. I'm not really disagreeing with what you say, only with the thought that regulations are required to make it work. All the regulations in the world have not stopped stall-spin accidents. How about we work on that one? Allan Allan, we absolute agree about additional regulation. My point is that we should use good oxygen systems, a pulse oxymeter and read all the important literature. Bill Daniels |
#4
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![]() "Eric Greenwell" wrote in message ... Bill Daniels wrote: At 16,000 ft., I can't tell the difference with or without O2. Unfortunately, feeling fine can be one of the first symptoms of hypoxia. How you FEEL means little. The only quantitative measure of hypoxia is a pulse oxymeter. Borrow one the next time you fly. The numbers will likely surprise you. Since he feels (or at least "can't tell the difference") the same with and without oxygen, are you suggesting he was hypoxic without the oxygen but just couldn't tell that he was functioning differently than with the oxygen? Exactly. I often do a similar test when flying with oxygen: I go to 100% for a couple of minutes; if I then still feel the same and my decisions still seem sensible, I assume I've been getting enough oxygen. Does seem like an adequate test for altitudes up to 25,000', the highest I've gone? I've not used an oximeter, so I don't know what my readings are before or after. -- Change "netto" to "net" to email me directly Eric Greenwell Washington State USA As one AME put it to me, "If you are self-diagnosing hypoxia without a pulse oxymeter, you have a fool for a doctor". I think this is one of the central danger points of aviation oxygen use. The presumption that a pilot who has a lot on his plate can self-diagnose hypoxia symptoms has been in use since before WWII with dubious results to say the least. Inexpensive pulse oxymeters have finally brought some objectivity to oxygen use. I highly recommend them. This is especially true with inconsistent oxygen delivery systems like nasal cannulas. Bill Daniels |
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