My sleep doc. suggests that my reported short term memory impairment may well be related to my severe obstructive sleep apnea (AHI = 76 untreated) and that with effective treatment my memory will improve significantly over time. My immediate concern is that my current titrated CPAP is not especially effective; my AHI = 32 with titrated CPAP.
Now, I've found 1 sleep study on line suggesting that short term memory does improve with effective CPAP therapy over time (e.g. 6 hrs. effective CPAP per night for 3 months). (However, this study may not apply to me given my high AHI with CPAP.)
Does anyone have any testimonials or articles to share on how CPAP usage has improved short term memory (e.g. How long after starting CPAP was memory improvement noted? How many hours per night of CPAP? What were the AHI levels with CPAP? How much improvement approximately)?
I'm using straight CPAP - 12 mm H20. Limiting pressures was the appearance of post arousal central apneas. BIPAP was tried with marginally poorer results (i.e. a few more central apneas than CPAP by 12 mm). APAP was never tried.
My machine has a memory card recording first-order compliance only (e.g. how often and for how long I use the unit). Minor leaks are not recorded however.
Your comments regarding possible leaks are interesting. I have been told in the past that I tend to "mouth breath" and my mask is of the pillow only type. Hence, it could be possible that I'm mouth breathing while "asleep" defeating somewhat my CPAP. Yet, I notice that when I try opening my mouth under CPAP that the sensation is most unpleasant and I would be somewhat surprised if that action while sleeping didn't fully awaken me. Further, I note no excess mouth dryness in the morning (and why wouldn't the lab tech. have noted "mouth breathing" during CPAP titration?). Still it's worth looking into. Perhaps I might try a chin strap or a full mask as a check. (As asides, I do notice under CPAP when still awake that I tend to want to move my lower jaw forward. Perhaps a full mask or dental appliance is suggested. I also experience with CPAP vivid dreams - awakening 2x nightly (REM rebound?).)
The sleep doc. hasn't reviewed my results with me yet. She has only sent me a report and ordered my hardware. I've been only on my CPAP machine now for 7 nights. I'll certainly bring up concerns w.r.t. my present titrated CPAP of 32 when I see her in October. I need to keep trying - I also have Type 2 diabetis. I suspect that I've had OSA most of my adult life - 30+ years. On the positive side, since starting CPAP I do feel more alert during the day and calmer and believe my short term memory has started to improve a little (hopefully not all a placebo effect).
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