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How long does a sleep study need to be to detect central sleep apnoea
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napnaptime Offline

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Post: #1
How long does a sleep study need to be to detect central sleep apnoea
I have had a sleep study done a year ago, I only got 2 hours sleep on my sleep study in which I was diagnosed with obstructive sleep apnoea, with a years worth of CPAP I still feel very tired and my memory is actually declining, my ENT suspects I have central sleep apnoea.

Is 2 hours on a sleep study adequate to rule out central sleep apnoea?
11-17-2015 04:07 PM
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zonk Offline

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Post: #2
RE: How long does a sleep study need to be to detect central sleep apnoea
Which S9 is your machine? the name printed next to on/off button
The S9 (except S9 Escape and S9 Escape Auto) detect and score central apnea
11-17-2015 04:31 PM
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archangle Offline
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Post: #3
RE: How long does a sleep study need to be to detect central sleep apnoea
A sleep study will miss a lot of central apnea unless it's a split night study. Some people have central apnea when not under CPAP pressure, but a lot of people only show it when they are under CPAP pressure.

Did they mask you up and try to determine a pressure setting?

In one sense, a sleep study should be done every night for several weeks on everyone to detect central apnea. I think everyone should have a fully data capable CPAP and it should be monitored to detect if you're developing central apnea.

I agree we need to know what CPAP machine you have.

Get the free SleepyHead software here.
Useful links.
Click here for information on the main alternative to CPAP.
If it's midnight and a DME tells you it's dark outside, go and check it yourself.
11-18-2015 01:40 AM
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zonk Offline

Advisory Members

Posts: 7,908
Joined: Feb 2012

Machine: A10 AutoSet
Mask Type: Nasal mask
Mask Make & Model: Activa LT
Humidifier: Integrated /ClimateLineAir
CPAP Pressure: 9/13
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Post: #4
RE: How long does a sleep study need to be to detect central sleep apnoea
My memory is fading fast, OP uses S9 AutoSet
Please, add the name of the S9 in your profile, so I won't have to repeat the same question
11-18-2015 02:07 AM
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napnaptime Offline

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Machine: Resmed S9 AutoSet with H5i humidifier
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Post: #5
RE: How long does a sleep study need to be to detect central sleep apnoea
(11-18-2015 01:40 AM)archangle Wrote:  A sleep study will miss a lot of central apnea unless it's a split night study. Some people have central apnea when not under CPAP pressure, but a lot of people only show it when they are under CPAP pressure.

Did they mask you up and try to determine a pressure setting?

In one sense, a sleep study should be done every night for several weeks on everyone to detect central apnea. I think everyone should have a fully data capable CPAP and it should be monitored to detect if you're developing central apnea.

I agree we need to know what CPAP machine you have.

I have a Resmed S9 AutoSet with H5i humidifier, on my sleep study I did an overnight study and an MSLT the next day but the odd thing was I got only 2 hours of sleep on my study and the next day I wasn't really tired I just lay down feeling fatigued.

I have played with varying my sleeping hours but nothing works. My Sleep specialist is refusing another sleep study saying that I do not have central sleep apnea but I don't see how they could have ruled that out in only 1 sleep study of 2 hour duration.
11-18-2015 10:07 AM
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archangle Offline
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Machine: ResMed S9 AutoSet
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CPAP Software: ResScan SleepyHead EncoreBasic

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Post: #6
RE: How long does a sleep study need to be to detect central sleep apnoea
What does SleepyHead show in terms of central apnea?

Get the free SleepyHead software here.
Useful links.
Click here for information on the main alternative to CPAP.
If it's midnight and a DME tells you it's dark outside, go and check it yourself.
11-18-2015 10:17 AM
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napnaptime Offline

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Post: #7
RE: How long does a sleep study need to be to detect central sleep apnoea
Monday 09th - 4 Clear Airway events, 1 hypopnea events
Tuesday 10th - 5 Clear Airway events, 2 hypopnea events
Wednesday 11th - 4 Clear Airway events, 2 hypopnea events
Thursday 12th - 9 Clear Airway events, 2 hypopnea events
Friday 13th - 8 Clear Airway events, 1 hypopnea events
Saturday 14th - 10 Clear Airway events, 2 hypopnea events
Sunday 15th - 1 Clear Airway event, 0 hypopnea events
11-18-2015 12:12 PM
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napnaptime Offline

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Posts: 61
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Machine: Resmed S9 AutoSet with H5i humidifier
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Post: #8
RE: How long does a sleep study need to be to detect central sleep apnoea
Is that significant?
11-20-2015 06:29 AM
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archangle Offline
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Machine: ResMed S9 AutoSet
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Mask Make & Model: ResMed Swift FX
Humidifier: ResMed S9 H5i
CPAP Pressure: 16-20
CPAP Software: ResScan SleepyHead EncoreBasic

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Post: #9
RE: How long does a sleep study need to be to detect central sleep apnoea
(11-18-2015 12:12 PM)napnaptime Wrote:  Monday 09th - 4 Clear Airway events, 1 hypopnea events
Tuesday 10th - 5 Clear Airway events, 2 hypopnea events
Wednesday 11th - 4 Clear Airway events, 2 hypopnea events
Thursday 12th - 9 Clear Airway events, 2 hypopnea events
Friday 13th - 8 Clear Airway events, 1 hypopnea events
Saturday 14th - 10 Clear Airway events, 2 hypopnea events
Sunday 15th - 1 Clear Airway event, 0 hypopnea events

Total events or events per hour.

Doesn't sound too bad if it's per hour, but look at your flow rate waveforms and see how long the individual events are.

Get the free SleepyHead software here.
Useful links.
Click here for information on the main alternative to CPAP.
If it's midnight and a DME tells you it's dark outside, go and check it yourself.
11-21-2015 03:31 PM
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napnaptime Offline

Preferred Members

Posts: 61
Joined: Oct 2015

Machine: Resmed S9 AutoSet with H5i humidifier
Mask Type: Full face mask
Mask Make & Model: Resmed Airfit F10
Humidifier: Yes
CPAP Pressure: 10
CPAP Software: SleepyHead

Other Comments:

Sex: Male
Location:

Post: #10
RE: How long does a sleep study need to be to detect central sleep apnoea
(11-21-2015 03:31 PM)archangle Wrote:  
(11-18-2015 12:12 PM)napnaptime Wrote:  Monday 09th - 4 Clear Airway events, 1 hypopnea events
Tuesday 10th - 5 Clear Airway events, 2 hypopnea events
Wednesday 11th - 4 Clear Airway events, 2 hypopnea events
Thursday 12th - 9 Clear Airway events, 2 hypopnea events
Friday 13th - 8 Clear Airway events, 1 hypopnea events
Saturday 14th - 10 Clear Airway events, 2 hypopnea events
Sunday 15th - 1 Clear Airway event, 0 hypopnea events

Total events or events per hour.

Doesn't sound too bad if it's per hour, but look at your flow rate waveforms and see how long the individual events are.

I don't know how to read this stuff I can barely read a page of a book my cognition is so messed up.
11-21-2015 06:28 PM
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