my note -- The "other thread" is this one: Jun 28, 2006 subject: APNEA -v- HYPOPNEASnoredog wrote:SWS wrote:How is that? I thought that central apnea and central Hypopnea were difficult to spot on a PSG from the other thread?Cheyne Stokes is probably one of the easiest central-apnea breathing patterns to algorithmically recognize.
As a breathing pattern, Cheyne Stokes respiration is absolutely unmistakable to an observer. I can well imagine a machine design able to recognize the distinctive Cheyne Stokes cycle of increasingly deeper breaths followed by steadily diminishing shallower breaths, cessation; then starting all over again with increasingly deep breaths. It's a repetitive, predictable, pattern very obvious to the onlooker.
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medicalglossary.org
An abnormal pattern of breathing characterized by alternating periods of apnea and deep, rapid breathing. The cycle begins with slow, shallow breaths that gradually increase in depth and rate and is then followed by a period of apnea. The period of apnea can last 5 to 30 seconds, then the cycle repeats every 45 seconds to 3 minutes.
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mywhatever.com
Cheyne-Stokes respirations refer to a rhythmic change in respirations wherein breathing becomes shallower and shallower variably with a slowing in respiratory rate that culminates usually in complete cessation of breathing for several seconds to more than a minute. This is followed by progressively stronger respirations that become exaggerated and quite deep. This pattern is thought to result from abnormal brainstem responses to CO2 levels in the blood - initially undercompensating and then overcompensating.
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Dec 30, 2004 Subject: Cheyne Stokes Respiration
I think -SWS's comments about the CS 2 machine, as well as the discussion in the Apnea v Hypopnea thread is fascinating.
The earliest mentions of the CS 2 machine that I recall seeing were by a poster nicknamed "HH" on the TAS message board. I'm sure -SWS and Snoredog and ozij all remember HH's thoughtful posts fondly:
A search turned up other topics where the CS2 was mentioned, but unfortunately I can't find HH's original announcement of that machine peeking up over the horizon.
Sep 05 2004 subject: ResMed AutoSet CS2
Sep 23 2004 subject: Autopaps and CSA events
Jan 25, 2005 subject: AutoPAP and BiPAP combined topic started by WillSucceed - "Do any of you know of a machine that has autopap features (adjusts pressure as needed in response to flow limitations, etc.,) AND also has the ability to deliver a back-up rate for those people who have central apneas and need the machine to kick-in with a rate when a central occurs?"
Jul 22 2005 subject: Central Apnea/Cheyne Stokes - I'm scared topic started by Happycpaper - "I just came from my Pulmonary Specialist (sleep Doctor) and he told me that the sleep study revealed that I had Cheyne Stokes breathing, that is related to Chronic Heart Failure."
Reply by "HH": There is actually some good news on the way - it just depends on how long the FDA takes in letting it arrive.
ResMed has developed an AutoSet CS for your situation and it addresses Cheyne Stokes breathing. Information on it can be found at resmed.com.au under Clinicians.