(01-12-2014, 09:54 PM)Sleepster Wrote: You would have to check your data to see if the pressure really is maxing out at 16 cm H2O when you sleep on back.
What Sleepster said. Perhaps even 16 is not high enough when sleeping on your back. If the pressure ever maxed out during your nap on your back then the max pressure needed to have been set higher.
Also, before napping on your back it may help to increase your minimum pressure to be closer to whatever tends to be your median pressure when sleeping on your back. It takes at least a little while for the pressure to adjust itself higher, especially if starting from too low a minimum pressure. And the lower the ResMed minimum pressure is, the faster the pressure drifts too low, leading to obstructive events which kick the pressure back up again.
For example, if your median pressure when sleeping on your back was 14, then 12 would probably have been a better minimum pressure (when sleeping on your back).
Or, if you had the Ramp turned on while taking your nap on your back, this may explain the high AHI, because perhaps the machine only starts its AutoSet algorithm after it completes the ramp time. (You would be able to see this in the data -- if there were obstructive events during the ramp period but the pressure did not start to respond until after the ramp period ended.)