Odd Spike in AHI

I have been going along quite happy, with AHI running .7 up to 3.2. Night before last, though, had ahi 10.79. I had not changed anything. With the same setup, last night AHI was back to 2.11. No major leaks either night. Wonder why such a sudden spike?

What category of events increased?

Pugsy wrote:What category of events increased?

Pretty even between OA and Hypopneas.
AI=3.25 HI=4.26 CAI=3.45 REI=0.30 VSI=0.00 FLI=0.20 PB/CSR=0.00%%

Positional sleeping, maybe?


Den

.

Still the AHI was approx 2/3 obstructive in nature.
Maybe positional (maybe on your back more than usual)...maybe positional with REM stage thrown in for a double whammy.

Pugsy wrote:Still the AHI was approx 2/3 obstructive in nature.
Maybe positional (maybe on your back more than usual)...maybe positional with REM stage thrown in for a double whammy.

Well, I nev er sleep on my back. I do switch sides, maybe 3-4 times a night. AHI since that spike has been back to normal. Actually, it felt like a good night.
Just weird.

jsielke wrote:I have been going along quite happy, with AHI running .7 up to 3.2. Night before last, though, had ahi 10.79. I had not changed anything. With the same setup, last night AHI was back to 2.11. No major leaks either night. Wonder why such a sudden spike?

OK, so using the Dreamware, AHI got back to the 2-3.5 range. Last night I went back to my old Nuance pro nasal pillows, and had an AHI of .32. I guess the mask really does make a difference. Of that .32, all was "UA's"

What was your leak rate? UAs aren't usually flagged unless there is a big leak. How much time (if any) spent in large leak?

Are you still using a Respironics machine?

The other thing that can happen is that if your mask fit and everything lines up you can get into a deeper more normal sleep than before... going into a deeper sleep naturally causes more apneas... it may mean going to a higher starting pressure.