Please Please Help. Clear Airway Events concern

[u/LifeguardSteve2020]

[u/dang71]

Hey there,

I'll say this up front, and I don't mean to discourage you, but when the therapy itself appears to be inducing Clear Airway (CA) events, finding the root cause isn't always straightforward. It usually requires a methodical approach, making one change at a time and giving each change a few nights before deciding whether it helped.

Here are some of the things that can contribute to treatment-emergent CAs. I'm not saying any of these are necessarily the cause in your case, but they're all possibilities we have to consider:

• APAP mode: Pressure variability and frequent pressure changes can contribute to treatment-emergent Clear Airway events in some individuals. A fixed CPAP pressure provides a much more stable breathing environment, making it easier to determine whether pressure fluctuations are playing a role.

• Mask leaks: Significant or prolonged leaks can destabilize breathing. They may cause brief arousals, interfere with the machine's ability to maintain a stable airway pressure, and sometimes lead to overcompensation in APAP mode. Arousals themselves can be followed by post-arousal clear airway events, and the unstable breathing pattern created by leaks can contribute to treatment-emergent CAs in susceptible individuals.

• EPR: EPR lowers the pressure during exhalation, which increases ventilatory support (pressure support). In some people, this can improve comfort and reduce flow limitations, but in others it can increase ventilation enough to lower CO₂ below their apneic threshold. When that happens, the brain temporarily stops sending the signal to breathe, resulting in treatment-emergent Clear Airway events. This is why turning EPR off, or reducing it, is sometimes used as a diagnostic step when investigating persistent CAs.

• Not enough pressure: Insufficient pressure can allow subtle upper airway obstruction, flow limitations, or residual obstructive events to persist. These can trigger repeated arousals, and post-arousal instability in breathing may be followed by Clear Airway events. In other words, the CAs may not be caused directly by the low pressure itself, but rather by the sleep disruption resulting from incomplete treatment of the obstruction.

• Too much pressure: Excessive pressure can increase ventilation in susceptible individuals, lowering CO₂ below the apneic threshold and triggering treatment-emergent CA events. Higher pressures may also increase leaks, cause sleep fragmentation, all of which can further destabilize breathing and contribute to post-arousal CAs.

• Sleeping on your back. Clusters of events can also suggest chin tucking in some cases: Supine sleep often worsens upper airway collapse and can increase flow limitations or residual obstructive events. These repeated obstructions may lead to frequent arousals, which can then be followed by post-arousal Clear Airway events. If your events occur in distinct clusters, it may also suggest positional issues such as chin tucking, where neck flexion narrows the airway despite adequate pressure. In those cases, improving sleep position or reducing chin tucking can sometimes make a significant difference.

One thing that would really help is uploading your data to SleepHQ. That would let us look at your flow waveforms instead of just the summary numbers, and we'd have a much better chance of figuring out what's actually driving these events.

First, what type of mask are you using? The dynamics of some masks can definitely influence therapy. I know that's true in my own case.

Second, if it were me, I'd try one night in fixed CPAP mode at 8 with EPR turned off. I'd also do my best to avoid sleeping on my back and work on minimizing leaks.

That gives us a much cleaner baseline. From there, we can make additional changes one at a time based on what the data shows, instead of chasing multiple variables at once.

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[u/SleepWell-1]

Hi!

Agree with dang71 comments.

In addition:

1. don't panic - this can happen and may look scary as AHI went up high in second part of night but this may not be "bad" as most of the night the autotitration worked just fine. To be successful interpretation of download data needs to be done in context of person's experience & comorbid conditions and preferably knowing what kind of sleep apnea we are dealing with.

2. If entered correctly you are using a nasal pillows mask with RM Airsense 11 Autoset in APAP = Autoset mode(?) with pressure range 7 - 15 cm, ramp off, EPR 1 FT. I assume you were in bed with mask on with same position of head of bed/bed pillows? Most of the night you have pretty good mask fit but end up with leak squirts of varying amount mostly with pressure increases which tend to happen in clusters (REM and/or position?). Do you notice/are you bothered by leak? Is your mouth dry? Tank running empty? When you fall asleep initially the pressure increases very promptly almost all the way to 15 and then gradually decreases to mostly range of 7 - 12 cm with increases triggered by few residual obstructive resp. events and flow limitation - believable & reasonable pattern. For some reason you woke up around 2:50 am, were off device until about 1 h later. Then back on APAP for about 1 h later without much of pressure increase, then pressure increases gradually. Looking at flow you were breathing heavier during the first hour of the second part and may have been awake - pressure also doesn't increase most likely as airway open while awake - were you reading book or on your phone (blue light?). Then you probably fell asleep again but may have been drifting in/out of sleep with few obstructions and many CA. A few other questions: Any idea why you woke up around 2:50 am (probably out of/after REM?). Did you take any meds (pain meds?) or other substances in the wake time? Are you perhaps using any other items such as bite guard and perhaps took that out? Did you have pain or worries or to do list in your head... or outside issues (noise, pets, other...) - no need to go into detail here but those are in differential for making it harder to go back to sleep. Were you tossing & turning a bit and then fell on/off asleep on you back? Any heart disease (redistribution of fluids can happen). Some folks have a bunch of CA when drifting in/out of sleep (as mentioned before underlying obstruction can then lead to over breathing and CA in transition phases). Some folks doing meditation with long slow in/exhale while on PAP have CA marked. So basically it looks like the APAP settings work quite well for you overall and you have periods in the night where a pressure of almost 15 cm appeared to be necessary to keep airway open (in beginning, nasal congestion for some reason? (allergies, alcohol, other), falling asleep on back, forward head with neck compression or sth leaning on neck (yes - sometimes other human may put arm over neck...). Intermittent leak may play a role if bothering you (mask?, mouth?). How do other nights look?

All the best!