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AHI Increases as Night Progresses
#1
Hey All,

I am a recently diagnosed OSA patient. I am currently about 3.5 weeks into treatment with the following prescription:

CPAP: DreamStation APAP
Min Pressure: 5.0
Max Pressure: 10.0

After a couple of weeks on the CPAP, my AHI was around 6.0. After reading around the boards here, I upped my minimum pressure to 6.5 which seemed to have helped dramatically, and my AHI is averaging about a 3.0 and my clear airway events remained around 0.3.

I noticed a trend that early in the night my AHI is extremely low, but as the night progresses it seems to increase.

Looking at the charts, it looks like my 10.0 maximum is at a good place as I rarely reach the max. My 90% pressure is 7.9. Should I increase the minimum pressure to 7.0 and see if that helps?

Thanks in advance!

[attachment=2199]
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#2
Not sure what the chart is saying since I've not seen one like it before. In that middle graph, what do the bottom numbers represent? The 0-10? That's not the time of night, I can tell that.

But...AHI is the number of events divided by time. So there are two factors involved in determining the AHI. As time goes on during the night, the AHI is going to change. Go down sometimes, go up others.

Other factors to consider is sleeping position. It could be you roll over onto your back later in the night which increases the likelihood of events which also increases the AHI.
PaulaO2
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#3
Mateobus,
In reply to your question, it wouldn't hurt to raise the minimum pressure to 7cm.
It may tackle some of those hypopneas. The max pressure looks ok.

Once you make a change, try to keep it for at least a week to 10 days.
OpalRose
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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.




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#4
(02-27-2016, 02:48 PM)PaulaO2 Wrote: Not sure what the chart is saying since I've not seen one like it before. In that middle graph, what do the bottom numbers represent? The 0-10? That's not the time of night, I can tell that.

But...AHI is the number of events divided by time. So there are two factors involved in determining the AHI. As time goes on during the night, the AHI is going to change. Go down sometimes, go up others.

Other factors to consider is sleeping position. It could be you roll over onto your back later in the night which increases the likelihood of events which also increases the AHI.

The 0-10 are the number of hours so after 4 Mateobus was in the 4th hour of PAP use.
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#5
Hi mateobus,
WELCOME! to the forum.!
I wish you much success with your CPAP therapy.
Hang in there for more responses to your post.
trish6hundred
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