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Re: Odd CPAP Pressure Question

Posted by TiredEngineer on March 20, 2007 at 09:51:03:

In Reply to: Re: Odd CPAP Pressure Question posted by Bird Watcher on February 26, 2007 at 06:14:51:

Barometric Pressures will offset CPAP settings from -0.5 under to 0.25 cm/h2o over for normal barometric pressure ranges.
You go down almost 4 cm/h20 for every 1000 feet that you rise.
This does not factor in temperature.
I have not tried to figure out how the altitude compensation works, because if this were a relative number, it would be irrelevant, and the size of the number does not make sense as absolute.
The only thing that I can think of is that the medical profession sometimes uses different units than the engineering profession, and they are illogical to each other.

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