I'm not sure if I can answer all your questions, but I'll try.Grace~~~ wrote:Oh, I LIKE those two answers!
~~~ on my autoset
~~~ xpap
I will be sounding 'apnea educated' in NO TIME
Thank you. I need all the help I can get~~~
Also, thanks Den for the history lesson. That is really interesting.
Since I never had a titration study I wonder how much of it is an 'arte form' and how much is 'scientific' in finding that correct constant pressure?
Would folks going to multiple different studies in different states (or countries) be likely to have very different results? Could one study say they needed 4 and another 15? And did this happen a lot? Or were they usually pretty close?
It is optimum to always try and use the lowest possible pressure that will attain the desired results, right?
What are the dangers of overdoing pressure?
Will it make you weaker in any way?
I'm sure it would depend on the "sleep doctor" reading the data and how they went about it, but it COULD vary somewhat in the pressure they derived at.
Ideally, if the person directing the pressure search uses a method which increases the minimum pressure and reduces the maximum pressure, over a reasonably short period of time, they should be able to narrow it down to an optimum single pressure. The most important thing is the minimum pressure. As in straight pressure mode, it needs to be high enough to prevent most of the events.
The "wrong" way (in my opinion) would be to start with wide-open settings and use the 90% or 95% pressure without a fair amount of scrutiny as to why the pressures went there. The primary things that cause pressures to increase are Flow Limitations, Snores and in some circumstances apneas (depending on the algorithms of the various machines).
Yes, the general consensus (from a straight-pressure user's standpoint) is to achieve the "best" (or close to it) results using the lowest pressure. No sense in torturing one's self with too much pressure if it's not necessary for therapy.
From my personal experience, my sleep doctor prescribed a pressure of 18 cm. (the sleep study stopped at 16 cm.) but after deciding that I couldn't handle that much pressure, I reset my machine (almost immediately) to 10 cm. and was pleased that it was "just about right". In fact, I used that pressure for the first year and finally started increasing it a couple of centimeters. I had roughly 1.0 (or less) average AHI numbers to start with and watched things like snores drop on their own over a period of time.
I really don't think that it will make you "weaker".
As far as I know, the only "downside" of pressures "too high" is that for a very small percentage of the population, "pressure-induced Central Apneas" may occur. Somewhere I read that possibly 15% of the users MAY be susceptible to that condition. But, if the person monitors their therapy and is aware of it, it can be avoided. It was often thought that the pressure of 10 cm. was the dividing point for such things to occur. ResMed designed their "A10" algorithm around that number (hence the name). It kept the (S7 and S8 Series) ResMed APAPs from trying to treat apneas over that pressure unless certain other characteristics were present in the user's breathing. In reality, some people can have Centrals at lower pressures. So, it can be a challenge to treat some people......and that's why some very sophisticated machines have been developed for those who do have Centrals.
Den
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