(07-05-2021, 02:15 PM)Geer1 Wrote: The oximiter is helping as it does show desats even though there aren't obvious apnea. You may be right about the obesity hypoventilation syndrome or something similar being part of the issue. The issue appears to be what looks like small inhalations (although still larger then mine for example), your exhalations are very fast (potentially due to restrictive nature of breathing in and weight on chest etc) and I am guessing your respiration rate is high because body is trying to maintain CO2/O2 levels by increasing respiration rate to keep up with demand since the inhalations are probably their natural size but not enough to keep up with O2 requirements.
I would change trigger back to normal as very low is causing IPAP to appear late in inhalation. I am thinking should try a lower rise time (say 500) as well as that will give more ventilatory assistance then raising IPAP will. I am also thinking increase EPAP to 8 and IPAP to 12 (same 4 cm PS but slightly higher pressure).
As you have made these changes has anything stood out as being obviously better or worse? Specifically curious about the rise time and pressures (if anything has ever felt uncomfortable. Even the 29th when you tried high PS at a low rise time did that feel ok (until the next morning)?
Edit: I am sure you already know this but perhaps seeing this data has been a bit of an eye opener. Trying to lose some weight does appear like it could make a significant difference in remedying this issue.
I changed the trig, rise time, Ti_Min/Max, by doing deep breathing exercises, while connected to the machine. Sitting upright at the kitchen table, not in bed. Deep inhale was cut short, the iPAP was shutdown while I was still breathing in. And long deep exhale was stopped by a new cycle of iPAP starting, before I stopped exhaling. I did not inhale. I played with everything but the rise time and pressure settings. My resp_rate looks better.
The 29th test was not a good sleep, I woke tired, and the whole day was bad.
Increasing the Rise Time was good. I think the oxy recorder will work now, just needed some tape on the finger sensor.
I am going to work on RR, my weight, and I ordered a inclined foam wedge to sleep on.
Too early to say "obesity hypoventilation syndrome", that was wishful thinking on my part. I have a deep fear of having a Central Apnea condition.