I, too, have mostly central apneas and hypopneas. I don't think my CPAP makes a difference in either, but I have been monitoring my central/hypopneas with a pulse oximeter. I just stop breathing, and 30 seconds go by as my O2 sinks, then I breathe again. My CPAP shows the ratio shown in the image above. But when I talked to my pulmonologist, he showed me his report. As far as he could see, my sleep apnea was 'fixed' because my AHI was 4 and under. All that report showed was the AHI. He was apparently not able to drill down. And of course, the O2 level isn't shown either. Nor is the time they appear, which I think would be helpful for treatment. Just bothers me that this information is available to the machine and the user isn't available to the doctor.