Thanks for the replies. I've been thinking about switching doctors anyway. Haven't been too impressed with this one for other reasons. I should also mention I had zero or one central apneas during my sleep study. I'm realizing I haven't saved a copy yet so I can't check til later.
I've been at 20 since I got this machine in January (though I wasn't able to sleep with it on til I got a full face mask in February). So really about a month and a half. And only recently have I been able to sleep through the whole night, so I think I am still adjusting. But the CAs are getting more frequent.
They got the sleep study pressure up high by the end of it, but I can't remember the specific of that and when the central apneas did or didn't happen. Really I just need to get my copy when I get home later.
Best guess -- pressure induced central apnea.
You might need to max IPAP limited to about 16. Also you have variable PS of 4 to 8. Your CA cluster is happening at high IPAP plus a wide split in PS.
The high split in PS may be permitting to to exhale too much CO2 upsetting the brains trigger.
It's a bit complex, so, I'd consult a sleep doc who knows their stuff.
INFORMATION ON APNEA BOARD FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED AS MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE APNEA BOARD WEB SITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.
Alright, I have an appointment with a new doc set for next week. I'm also not completely sure my pressures need to be so high. I had a hell of a time acclimating to the CPAP machine and only became compliant after I gave up on nasal masks. I'm not sure if earlier fixes would have been necessary if I was using a ffm. But I'll see what this new doctor says. Thanks for yall's help.