Hello Guest, Welcome to Apnea Board !
As a guest, you are limited to certain areas of the board and there are some features you can't use.
To post a message, you must create a free account using a valid email address.

or Create an Account


New Posts   Today's Posts

Confused about AHI results
#1
Confused about AHI results
I've just finished 2 months on CPAP therapy, and things have settled down pretty well. Thanks very much to the many helpful suggestions and encouraging messages I've received here.

I've used my CPAP every night since starting therapy in early June, and i keep my mask on faithfully for 6-7 hours per night. I sleep on my side all night, usually. After a couple of rocky weeks at the beginning, my AHIs are now consistently under 5.0, usually between 3.0-4.5.

One thing puzzles me, however. Very often my 1st session, which is typically 4-5 hours, has dramatically better results than my shorter 2nd session and -- when I have more than 2 sessions -- my even shorter 3rd session.

Most of my AHI events comprise CAs, with very few hypopneas, and even fewer, if any, OSAs and RERAs. What happens is that I frequently experience a disproportionate number of closely-bunched CAs in the early morning after I've gotten up to use the bathroom and then go back to bed. For example, attached is a Sleepyhead screenshot of last night, showing the difference in results between my 1st session (5 hr 20 min) and my 2nd session (27 min). The AHI for my 1st session was 1.90, but with the 27 min 2nd session factored in, the AHI jumps to 3.90, twice what it was previously. The cause was 1 hypopnea and a cluster of 10 CAs in the short 2nd session.

This pattern is very common for me -- good therapy results for most of the night, then a short period in early morning with lots of CAs, resulting in a passable, but decidedly mediocre, overall AHI result.

Any thoughts on what's going on here, and what, if anything, I can do about it?

[attachment=1663]
Post Reply Post Reply
#2
RE: Confused about AHI results
Here's a better link for the image: http://screencast.com/t/t7K0QU9tu3iH
Post Reply Post Reply
#3
RE: Confused about AHI results
(08-10-2015, 03:26 PM)AndyB Wrote: What happens is that I frequently experience a disproportionate number of closely-bunched CAs in the early morning after I've gotten up to use the bathroom and then go back to bed.
Events scored while you're awake, are meaningless and can be discarded


Post Reply Post Reply
#4
RE: Confused about AHI results
I'm asleep during these shorter early morning sessions, but undoubtedly I'm not sleeping deeply.
Post Reply Post Reply
#5
RE: Confused about AHI results
Same here. That's when almost all of my centrals take place.
Post Reply Post Reply
#6
RE: Confused about AHI results
I get the same type of thing only with a few OAs thrown in for good measure, if I am barely asleep or if I am drifting between being asleep and awake. I think it is just sleep-wake junk and should be disregarded.

Best Regards,

PaytonA

Admin Note:
PaytonA passed away in September 2017
Click HERE to read his Memorial Thread

~ Rest in Peace ~
Post Reply Post Reply
#7
RE: Confused about AHI results
Thanks for the replies -- I thought there might be more to it than just transition-time CAs, but I'm glad to get other opinions.
Post Reply Post Reply
#8
RE: Confused about AHI results
The machine aren't accurate in reporting events while you're awake. I often run test sessions during the day while watching TV or reading and often get several OA's scored and my AHI is often reported as being above 10. All that when I know for an absolute fact that I never pause breathing for any 10 second intervals. It makes me wonder if the reports are all that accurate when sleeping. That may help justify why you are required to get a lab sleep test to get insurance to cover the cpap machine.

Dude
Post Reply Post Reply
#9
RE: Confused about AHI results
[Image: 98vdy8.jpg]
Post Reply Post Reply
#10
RE: Confused about AHI results
(08-11-2015, 10:48 AM)surferdude2 Wrote: https://www.dropbox.com/s/fktalfepdxfja7...s.jpg?dl=0

Did you zoom in on the flow rate for those events to see what type of flow disturbance was being detected? If not please do so.
I find it very interesting that you are not aware of any disturbances yet the machine senses something.

I now know that I skip breathing when I am awake but I did not become aware of it until I took up SCUBA diving (many years ago). Loud breathing is the only thing you hear and it takes a little bit more effort than regular breathing so it was easier to notice.
if you can't decide then you don't have enough data.
Post Reply Post Reply


Possibly Related Threads...
Thread Author Replies Views Last Post
Question [Diagnosis] Home Sleep Study Results & Feedback togapilot 6 532 03-26-2024, 02:36 PM
Last Post: togapilot
  Can someone take a look at my OSCAR results? 3-4 weeks of CPAP & still improvements senseisaitama 5 133 03-24-2024, 10:43 PM
Last Post: Deborah K.
  [CPAP] Please help me interpret my results baganaz 2 181 03-14-2024, 12:48 PM
Last Post: baganaz
  [CPAP] Persistant night waking - Oscar results help please philjones 0 158 03-07-2024, 05:39 PM
Last Post: philjones
  Need help interpeing Lofta test results. LoftaUser 0 133 03-07-2024, 01:10 PM
Last Post: LoftaUser
  APAP Trial - First Night's Results - Interpretation? Juicy 9 4,178 03-04-2024, 09:34 AM
Last Post: colethegamer
  Help interpreting Oscar results stanley61 10 474 03-03-2024, 01:03 PM
Last Post: stanley61


New Posts   Today's Posts


About Apnea Board

Apnea Board is an educational web site designed to empower Sleep Apnea patients.