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Why a sudden increase in central apneas?
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zonk Offline

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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
CPAP Software: ResScan

Other Comments: CPAP since Nov 2010

Sex: Male
Location: Australia

Post: #11
RE: Why a sudden increase in central apneas?
(02-07-2014 03:51 AM)igdoc Wrote:  New to this forum but not new to this.
Hi igdoc, welcome abaord
How you like the machine "Sefam auto evolve"
http://www.sefam-medical.com/configurations.html
(This post was last modified: 02-07-2014 05:26 AM by zonk.)
02-07-2014 05:24 AM
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igdoc Offline

Members

Posts: 13
Joined: Feb 2014

Machine: PR S1 Bipap ASV Advanced 961
Mask Type: Full face mask
Mask Make & Model: ResMed Quattro FX
Humidifier: Built in
CPAP Pressure: EPAP 7.5. PS 0 to 7
CPAP Software: SleepyHead EncoreViewer EncorePro

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Sex: Male
Location: England

Post: #12
RE: Why a sudden increase in central apneas?
Thanks Zonk,
The SEFAM is a French APAP machine derived from the Sandman. It is small and quiet with a built in humidifier. It tries to distinguish between central (clear airway) and obstructive events but (same as other APAP devices) is not 100% accurate at this. Before discovering that I had Complex Sleep Apnea with 30 central events per hour, the SEFAM would keep pushing up the pressure because some of the events were wrongly classed as obstructive. APAP machines and CPAP induced central events don't go well together!

I have managed to avoid needing an ASV machine by using CPAP mode at a low pressure and, most importantly, by disabling the exhalation relief (CFEX, AFLEX, EPR) to reduce the hyperventilation induced central episodes.

(Sorry in my first post I missed that this topic is relatively old but hopefully still relevant to the small percentage who have high numbers of central events)
02-07-2014 07:33 AM
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trish6hundred Offline

Advisory Members

Posts: 6,430
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: #13
RE: Why a sudden increase in central apneas?
Hi igdoc,
WELCOME! to the forum.!

trish6hundred
02-08-2014 07:15 PM
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justMongo Offline

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Posts: 3,840
Joined: Sep 2013

Machine: ResMed VPAP Auto (S9)
Mask Type: Full face mask
Mask Make & Model: ResMed Mirage Quattro
Humidifier: ResMed H5i
CPAP Pressure: 18 IPAPmax - 11 EPAPmin, PS=5
CPAP Software: Other Software

Other Comments: μολὼν λαβέ

Sex: Male
Location: Калифорния

Post: #14
RE: Why a sudden increase in central apneas?
Why does bilevel (compared to CPAP) induce hyperventilation? I know that hyperventilation blows off blood CO2 reducing ones central ventilation drive. But, what is it about bilevel that induces HV?

I'm seeing some CAs; and I am wondering is I should up my EPAP pressure by 1 cm-H2O to see if this reduces CAs.

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.
02-08-2014 08:16 PM
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archangle Offline
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Advisory Members

Posts: 3,159
Joined: Feb 2012

Machine: ResMed S9 AutoSet
Mask Type: Nasal pillows
Mask Make & Model: ResMed Swift FX
Humidifier: ResMed S9 H5i
CPAP Pressure: 16-20
CPAP Software: ResScan SleepyHead EncoreBasic

Other Comments: Happy PAPper

Sex: Undisclosed
Location: USA

Post: #15
RE: Why a sudden increase in central apneas?
Be sure to use SleepyHead to look at your airflow waveforms and figure out how "real" and how serious the centrals are. Sometimes the machine will flag something that's not that concerning once you look at the waveforms. Or it might be long and complete apneas that are even more worrying.

Step one would probably be to undo the changes and see what happens. Then maybe experiment with a few other changes, such as lower pressure without bilevel, and monitor AHI and centrals.

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.
02-12-2014 02:20 AM
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