I awakened this morning and looked at the usage, mask fit and AHI data for my Resmed S9 machine with a nasal pillows mask. It showed 7.9 hours of use and an AHI of 1.1. Now fully awake, I kept my CPAP machine on, with my the nasal pillows mask on for an additional 20 minutes and re-read the display. The AHI had jumped to 1.4. Since I was fully awake, I think I would have noticed if I had stopped breathing. I did not. Is the increase in the AHI reasonable under these circumstances?
Additionally, the display showed a "frown" for mask fit. I did remove the mask with the machine still running (i.e., not turned off) twice during the night for about 2 to 3 minutes each time. How do such disruptions effect the AHI? I use the auto-start feature with the S9, which will stop the machine when I remove the mask, and restart it again when I replace it and it senses I'm breathing. Each time the machine is restarted under these circumstances, I run the test to determine if there is a mask leak. There was no leak indicated.
Thanks in advance any replies.