cflex or aflex ?

Decided to investigate the difference. I read cflex just effects exhale and a -flex effects both inhale and exhale . I know its a comfort setting but I have been on aflex from the start . To tell you the truth I forgot it was an option and I began to think it was a for an auto machine and c for cpap , I thought it was all generic epr .
My treatment and ah1 is fair but I awake in 4-5 hours stay up for 1-2 hours then I usually sleep 2-3 hours . I gave up all alcohol 4 months ago for both my diabetes and sleep apnea . I' m on a diet and losing weight , my a1c is coming under control. I've changed my diabetes medication so its a mix of hard work . My doc is happy I'm making forward progress whatever I'm doing.
I'm looking for that sweet spot that will let me sleep all night 60 percent of the time. That's where you all come into play, is cflex any better or is it just another personal setting. What are the majority using. Maybe at 68 I'm stuck with this fragmented sleep. I don't like sleep drugs so that's out unless I can't get any sleep. Now 5:34am, been at it since 4 am just about to go down again . Guess we are all fighting some kind of battle every day.
Thanks .

Hi- you would use c-flex only if you had consistent trouble exhaling on Cpap (the feature is called EPR on some machines). If you're not aware of a problem you probably don't need it. Waking up partway through the night can have many causes.

My understanding is that A-Flex is available when you are using AUTO mode and C-Flex (or C-Flex+?) is available when you are using CPAP mode.

There are subtle differences between A-Flex, C-Flex+ and C-Flex, but they all provide a (variable) drop in pressure at the beginning of each exhalation. The amount of the drop depends on the force of the exhale: The harder you exhale, the more the drop in pressure. The Flex setting controls the maximum amount of the drop: Given the same amount of force in the exhalation, the higher the Flex setting, the more pronounced the drop in pressure will be.

Some pictures from the PR website may make it easier to understand

C-Flex

The therapeutic pressure is the horizontal line in the BOTTOM graph. So this figure indicates that C-Flex raises the pressure back up to the full therapeutic setting about halfway through the exhalation.


C-Flex+

The therapeutic pressure setting is the top horizontal line in the BOTTOM graph. So this figure indicates that C-Flex+ raises the pressure back up to the full therapeutic setting in two steps: The first step is about halfway through the exhalation and the pressure goes partway (about 1/2 way) back up to the full therapeutic setting; the second step is at the beginning of the inhalation and the pressure is then increased all the way to the full therapeutic setting. There is also "rounding" of the pressure curve at the end of the inhalation: The pressure drops very, very slightly towards the end of the inhalation with C-Flex+.


A-Flex

The therapeutic pressure setting is the top line in the BOTTOM graph. (Note that you can see the change in pressure from the AUTO algorithm in this graph.) So this figure shows that A-Flex is like C-Flex+ except it is used when the machine is in AUTO mode. A-Flex raises the pressure back up to the full therapeutic setting in two steps: The first step is about halfway through the exhalation and the pressure goes partway (about 1/2 way) back up to the full therapeutic setting; the second step is at the beginning of the inhalation and the pressure is then increased all the way to the full therapeutic setting. There is also "rounding" of the pressure curve at the end of the inhalation: The pressure drops very, very slightly towards the end of the inhalation with A-Flex+. With A-Flex, when the AUTO algorithm decides that a pressure increase is needed, the additional pressure is added at the beginning of the next inhalation. The new pressure setting is then used for the therapeutic pressure setting.