CyrusManz

At 0.8 AHI, you should not even have a concern. 0.8 is better than 99.99% of the general population:-)

There are several studies that were done both before and way after which debunk that study, now thought to have been purely political for business reasons. Look up Google scholar or [www.Clinicaltrials.gov] for the latest research. Here is one that is being conducted in Canada, thought to be the largest ever and due to end in Dec/2022: https://clinicaltrials.gov/ct2/show/NCT01953874

here is another one: https://www.sciencedirect.com/science/article/abs/pii/S0167527308009820 and another https://www.atsjournals.org/doi/full/10.1164/ajrccm.164.4.9908114 and another https://www.jstage.jst.go.jp/article/circj/advpub/0/advpub_CJ-10-0082/_article/-char/ja/ and one more, but there are more), https://www.jstage.jst.go.jp/article/circj/79/5/79_CJ-15-0221/_article/-char/ja/

That is not a theory, just calculations. Oscar doesn't get ALL the data it reports, from the machine memory card, but just SOME of the data like Flow Rate, Mask Pressure,Tidal Volume and it calculates the rest from these data sets. So if the machine reports a tidal volume of 0,.25 l/min (how much are displaces into your lungs at inspiration) and at a breath rate of 15 (how many times you breath per minute) then together with tidal volume, it can calculate other data like Minute Ventilation, such as 0.25 x 15 = 3.25 l.min (near enough to 3.5 l/min average Minute Ventilation that Oscar reports). So if the machine reports incorrect data such as tidal volume, then other data will also be incorrect because they strepulate from Minute ventilation. Now, we know your TD was twice as is now, before you changed the machine, so it must be the new machine that is producing faulty data. What machine did you have before?

So at a tidal volume of 250ml and (assuming) a breath rate of 12/min, your Minute Ventilation should be (12x0.25 = 3l/min). Oscar should show a MV of average 3 L/Min and average adult MV is about 5 to 8 liters per minute. You either have a tremendous amount of circuit air leak overnight or your machine is faulty.

Tidal Volume is a significant indicator for respiratory function and at 250 ml is what an 8 yr old female is at., so something is wrong here. An average North American (5'10" and at 170lb, should have a Tidal Volume of about 600-700ml. If you'd like to share what machine you used to use and what machine you have now and what software you use ti check your Tidal Volume, I may be able to help.

I am not sure why you are not on an ASV machine, if as you say, most your events are "central". Change your machine because you are not getting the therapy that you need. A Dreamstation BiPAP Auto SV is the best, if you are not worried about the recall. (only the use of Ozone cleaners tend to damage the foam, so a brand new machine without ozone cleaners should be fine).

That initial study was later debunked by another study that showed no relationship between LVEF and use of ASV. It appears that the patients who died in the first study, would have died on or off the machine and just because they died while under study, it does not necessarily mean that they would have stayed alive, if they were not on the machine. If you like, I can post a link to that other study.

I have no clue about your other symptoms but your sleeping pattern, drop in SpO2 etc, sounds very much like Central Sleep Apnea (CSA) symptoms. Once you get a polysomnography done, this would be confirmed however like other people have already said, a normal CPAP won't help you. You will need a ASV PAP machine. In my experience the Philips-Respironics BiPAP Auto SV is the best, however you may have reservations about its recall, in which case the only other choice is a Resmed AirCurve ASV which will soon be discontinued for a more expensive model.