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Newbie Question on CA Flows
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Bubster Offline


Posts: 11
Joined: Dec 2014

Machine: Respironics Series 60 M580 Auto A-Flex
Mask Type: Nasal mask
Mask Make & Model: Eason
Humidifier: System 1
CPAP Pressure: 11
CPAP Software: SleepyHead

Other Comments:

Sex: Male
Location: USA

Post: #1
Newbie Question on CA Flows
    Why does each CA event on my flow chart start with a large inhale and exhale just before the no-flow portion?
(See attached).

Just curious,
12-23-2014 05:40 PM
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vsheline Offline

Advisory Members

Posts: 1,906
Joined: Jul 2012

Machine: S9 VPAP Adapt (USA Model# 36007, not better 36037 or 36067)
Mask Type: Full face mask
Mask Make & Model: F10 or SimPlus w/ 2Liners. MirageQuatro & Gecko gel pad
Humidifier: H5i
CPAP Pressure: 15 EPAP, PS 5-10
CPAP Software: ResScan

Other Comments: Marfan Syndrome, chronic bradycardia, occasional Cheyne-Stokes Respiration

Sex: Male
Location: California, USA

Post: #2
RE: Newbie Question on CA Flows
(12-23-2014 05:40 PM)Bubster Wrote:  Why does each CA event on my flow chart start with a large inhale and exhale just before the no-flow portion?

Hi Bubster, welcome to Apnea Board!

As far as I know, our systems do not directly sense how much O2 is in our blood. Our systems sense how much CO2 is in our blood, and if the CO2 is too high then we get a stronger urge to breathe more.

A common cause for CA events is breathing deeply and washing out too much CO2. As soon as the CO2 builds up back to normal, we regain the urge to breathe and do so with normal effort. I think this type of CA may be less stressful to our systems than an obstructive apnea where we are struggling to breathe but cannot, leading to greater effort and a more explosive restart of breathing.

Your CAs look normal and I think are nothing to be concerned about. It is considered normal to have a few CAs per hour, as long as the AHI is less than 5.

Take care,
--- Vaughn

Membership in the Advisory Member group should not be understood as in any way implying medical expertise or qualification for advising Sleep Apnea patients concerning their treatment. The Advisory Member group provides advice and suggestions to Apnea Board administrators and staff on matters concerning Apnea Board operation and administrative policies - not on matters concerning treatment for Sleep Apnea. I think it is now too late to change the name of the group but I think Voting Member group would perhaps have been a more descriptive name for the group.
(This post was last modified: 12-23-2014 07:33 PM by vsheline.)
12-23-2014 07:21 PM
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