so, if you were used to EPR of 0, and getting such good results, you might sneak up on it by going for setting 1 and noting the results. The higher the EPR setting the lower the pressure you exhale against. This will probably change the expiration time to be lower. That isn't bad.
You currently have about the same inspiration time as expiration time (I:E = 1.0). Notice the readings at the new setting you have selected. At EPR=3, you might get a ratio of I:E of almost 2.0, exhaling twice as fast as your inhale.
When I shifted from CPAP EPR 0 to EPR 2, my IE went from 0.9 to about 1.65. Both were satisfying, but I do think I get more rest at IE of 1.65. I haven't asked around the forum as to whether others have seen the same.
We have seen that, in some cases of clear airway (CA) events, lower I:E ratios seem to result in lower count of CA events.
Note - As others have mentioned, when you shift EPR from 0 to 3, your effective exhale pressure is 3 cmH2O lower and this can lead to more flow limitations, and obstructive events (both H and OA). When adjusting EPR to a greater value, you may be served by also adding some to your pressure setting. Example - you have a CPAP pressure of 10 cmH2O, and want to shift from EPR of 0 to EPR of 2. You will probably be served by adjusting you CPAP pressure to 12, leaving the exhale pressure about as it was originally (10). since your setting is 12 with EPR 0, you might want to see if you feel better by moving to 13.5 and having EPR set to 2. Notice I increased pressure setting by 1.5 and EPR to 2. And take a look at your IE ratios before and after.
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