Auto CPAP Algorithm

A hypothetical question. If a person who has no OSA, no UARS or respiratory problem were to use a AUTO Cpap say REMSTAR M series or RESMED with setting 4 to 20 cmH2O would the pressure rise? to above 10cm or below 10?

The reason I asked this is because I was prescibed for a trial of Auto CPAP therapy 4-20 cm for a month after my sleep study, PSG and MLST. The PSG showed I had relative good night sleep with results, AH=6, MLST=6.5mins, O2sat=94%. The doctor said my OSA is very mild and not likely to be the reason for for my daytime sleepiness problem, but the MLST indicated that I was able to fall asleep at an average time of 6.5mins. This togehter with Elpworth test=18 showed that I indeed have daytime sleepiness problem. Nevertheless, to isolate OSA, the doc put me on this Auto CPAP trial.

I have tried a Remstar M series w Aflex with 4-20 cmH2O. The pressure went up to about 11.1cmH2O after about 5 hours of sleep. I woke up and was breathing normally for a while expecting the pressure to drop but it did not. Isn't the CPAP suppose to decrease when the breathing is normal.

Thanks in advance for your comments.









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The machine doesn't do anything (meaningful) when you're awake. What happens when you sleep is entirely different.