I have anxiety/panic disorder and treated for it. I had two episodes of DVT's and PE's in 2015 and 2018 and diagnosed with Factor V Leiden that makes me clot more. I was on Xarelto between those two times, but my doctor took me off and on baby asprin up until 2018 when I had the second DVT/PE. Now on maintenance dose Xarelto for life.
Sometimes during the day, I'll feel "foggy/tired", take SpO2 reading and it would be somewhere between 90-94%. My normal usual hovers around 94%, although it is weird. I get these "cold" spells where my body feels super cold, I take my reading and I'm at 100% constantly, until the cold spell goes away in an hour or two.
Anyway, going back to the chart below, my AHI is always low, with only a couple of 10-12 second CA's throughout the night. But my watch indicates my SpO2 goes down to 84-85% at times. I don't understand why! It has always been like this for years! My sleep doctor says all looks good and I have low AHI, and he doesn't know why my oxygen drops so rapidly to 85% just for a 10 second CA.
Anyway, I think this has been affecting my brain, and causing the atrophy, even though my family has a history of dementia/parkinsons. I think this oversight of my low SpO2 drops over the years has caused the atrophy and white matter spots.
I used to have a Contec device but the battery went out and it stopped working. I threw it away. The probe was bad too on it. But it too would always sound it's alarm at me to wake up when I put it to 85% alarm. The graphs would always show short drops to 85%.
Also when I fly, I have checked my oxygen with oximeter and it dips down to 90% or sometimes lower, for almost the whole flight. I have to take deep breaths to basically bring it up to even 95%. On my last flight, I had my friend try it, and his was basically normal at 95%. Also when I went to Arizona, I had a terrible first three days. I felt out of breath hiking around and even sluggish in my hotel. At night, my Contec said I was dropping to 80%, and one morning I woke up with raccoon/black eyes, due to the low oxygen. But after 3 days, I started feeling a little better. But it was a terrible experience. I drove to Flagstaff and at it's higher elevation I felt even more out and while at a museum felt about to pass out. I had to get back in my car and drive back down to Sedona.
So I think I have several things going on here with oxygen deprivation where my body has some issue. But none of my doctors have any answers. My last sleep test was in 2018 so I'm thinking about getting another one, and see if they can monitor my SpO2 during the night.
Pressure EPAP min 4.4, IPAP 8.4, IPAP Max 18, PS 4.