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Low-pressure CPAP: can you help?
#11
(09-22-2017, 09:38 AM)bonjour Wrote: Heli-Ox is used for deep diving.

Does this mean you would need to decompress when you wake up?

Nahh...   The helium is used to displace nitrogen to reduce narcosis, since nitrogen at high pressures is narcotic and helium is not.
Helium does require adjustment to decompression tables because it is dissolved into tissues more quickly, but it also off-gasses more readily as well, so the net effect is little change in total deco time, but the profile is adjusted to spend more time decompressing deeper.

Of course, helium is not a cure-all.   As you go deeper, the O2 mix must be reduced (21% O2 becomes toxic at 180-200ft), and helium replaces it to a point.   Once you get down to 500ft+, the level of nitrogen needed to prevent narcosis is so low, and the level of O2 required to prevent CNS convulsions is so low, that the majority of the mix is helium.
Problem is, high pressure helium can cause HPNS, which also causes tremors.    There is a limit to how deep a human can dive without a hard suit maintaining reduced pressure.
400ft or above?   The ideal mix maintains the PPO2 between .15 and .30, and maintains a nitrogen equivalent narcotic depth of less than 30m.  Mixes used below 300ft can not be inhaled on the surface due to insufficient O2.

At 1ata, a 21% O2 mix with helium would be no different than air since the helium dissolves into the tissues at the same pressure.  Switching back to air in the morning would simply result in the hitrogen replacing the helium in the tissues.
-- Rich
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#12
But...but...but... we're not talking about 400 or even 200 feet H2O... not even 1 foot H2O (30 cmH2O)!

Lacking any further evidence of efficacy of a helium-oxygen mixture at such low pressure, I would suggest this is a prank, at best. Unless evidence is forthcoming from the OP, I think we have spent enough time on this idea.
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#13
It would give the term "Light Headed" a new meaning.
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#14
What about central apnea? Would adding helium make any difference in that regards?
PaulaO2
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INFORMATION ON APNEA BOARD FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED AS MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE APNEA BOARD WEB SITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.




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#15
(09-22-2017, 02:58 PM)PaulaO2 Wrote: What about central apnea? Would adding helium make any difference in that regards?

Don't see why it would.
It would not result in a change in pressure from the machine (since the machine is effectively pressurizing against ambient pressure to hold the airway open).

At <20cm H2O, there's no notable difference between helium and nitrogen.
-- Rich
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INFORMATION ON FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED AS MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE WEB SITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.

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