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Re: Optimum pressure caveats, indeed!!

Posted by SGS on February 12, 2003 at 19:26:35:

In Reply to: Re: Optimum pressure caveats, indeed!! posted by - Sleepy Coote on February 12, 2003 at 18:43:18:

Sometimes it might be a good idea to look at pressure problems in terms of dive medicine. Then we're talking about some real pressure. 10m underwater is 2 bars (2 atmospheres). If I go down to this depth with 9 litres of air in a balloon it becomes 4.5 litres. 10cm H2O is less than the pressure I feel on my lungs when treading water in a swimming pool. I just can't see the HB reflex playing much role (I don't really know about this reflex; but OSA isn't a lung problem I can't see such a weak reflex playing any role where stretch isn't the problem.). HB seems to me to be telling you to stop breathing IN when you are already at a full lung stage.

If you are fully inflated (and HB is playing some role) how are you going to desaturate given my little 2 minute experiment? The desats in OSA occur at the end of an exhalation by this time the HB reflex (which stops over inflation) should be at it's nadir- no stretch, no HB.

It's extremely good to hear that you are doing so well on an autoCPAP. You are precisely the sort of person I think it should work best on. Low-moderate AHI, High Sleepiness and daytime symptoms. That's the focus of our planned experiment.

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