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AHI Increases as Night Progresses
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mateobus Offline

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Posts: 4
Joined: Feb 2016

Machine: Philips Dreamstation
Mask Type: Nasal pillows
Mask Make & Model: ResMed AirFit P10
Humidifier: Philips Dreamstation
CPAP Pressure: 10
CPAP Software: SleepyHead

Other Comments:

Sex: Male
Location:

Post: #1
AHI Increases as Night Progresses
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]
02-27-2016 01:06 PM
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PaulaO2 Offline
Wiki Editor
Moderators

Posts: 8,065
Joined: Feb 2012

Machine: S9 Autoset
Mask Type: Full face mask
Mask Make & Model: F&P Simplus
Humidifier: H5i
CPAP Pressure: 14-20
CPAP Software: SleepyHead

Other Comments: Ehlers-Danlos Syndrome, Hypermobility Type; chronic sarcasm

Sex: Undisclosed
Location: western NC, USA

Post: #2
RE: AHI Increases as Night Progresses
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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02-27-2016 02:48 PM
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OpalRose Offline

Monitors

Posts: 3,180
Joined: Nov 2014

Machine: PR System One REMstar Auto 560 with A Flex
Mask Type: Nasal pillows
Mask Make & Model: AirFit P10 For Her
Humidifier: REMStar heated humidifier with heated hose
CPAP Pressure: Auto Cpap 10-13 AFLEX 1
CPAP Software: SleepyHead EncoreBasic

Other Comments: Started CPAP Therapy October 23, 2014

Sex: Female
Location: Northeast Ohio, USA

Post: #3
RE: AHI Increases as Night Progresses
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
(This post was last modified: 02-27-2016 03:56 PM by OpalRose.)
02-27-2016 03:56 PM
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PaytonA Offline
Wiki Editor
Monitors

Posts: 3,013
Joined: Dec 2013

Machine: ResMed S9 VPAP Auto
Mask Type: Full face mask
Mask Make & Model: Resmed Mirage Quattro
Humidifier: H5i(distilled-top up)
CPAP Pressure: VAuto MinE14.0 MaxI 20.6 PS4.0
CPAP Software: ResScan SleepyHead

Other Comments:

Sex: Male
Location: Orange County,California

Post: #4
RE: AHI Increases as Night Progresses
(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.
02-27-2016 05:20 PM
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trish6hundred Offline

Advisory Members

Posts: 6,449
Joined: May 2012

Machine: Resmed S9 AutoSet for Her
Mask Type: Full face mask
Mask Make & Model: Fisher & Paykel Simplus
Humidifier: H5i Heated Humidifier
CPAP Pressure: 10 - 7-20 Cm H2O
CPAP Software: Not using software

Other Comments: I started CPAP in 2008. Totally blind since birth.

Sex: Female
Location: Missouri, USA

Post: #5
RE: AHI Increases as Night Progresses
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
02-27-2016 06:59 PM
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