Central apneas or Hypopneas?

G'day everyone!

I just have a question regarding central apneas or hypopneas. Do central apneas or hypopneas show up on an s9 data readout? I sometimes feel bad when waking up using CPAP but my compliance is excellent.

I tried to book in for a follow-up appointment at the local hospital last week but they are booked out for months. It occurred to me to try a private clinic yesterday so I called them this morning and they were booked out for months too - but upon telling them that I have been losing the plot and waking up tired they booked me in straight away. The technician checked my data and said that indeed my compliance is brilliant, my apnea per hour reduced to 1 so everything should work just fine. She booked me in tomorrow for an appointment with a specialist doctor because she said that I should be feeling great - and that it might be something like acidosis - that has just started when using the CPAP and I might need another machine. Wow the private clinics have SO MUCH better service than the public hospitals!!

What is acidosis

and

Does anyone know if central apneas or hypopneas show up on s9 autoset data readouts? I recall reading somewhere on the forum that rarely central apneas or hypopneas may start in someone using CPAP in rare cases and it can be fixed with another machine.

Yes, centrals show up on the S9 data reports if they are present.

A minor clarification ... Clear Airway apneas show up in the S9 data. However, since the S9 only uses breathing data, it can not accurately determine if the CA event is a central apnea or not. You might not have been asleep. For instance, when we toss and turn in the night, we often hold our breath. That is *not* a central apnea, since we are awake. But it would register as a clear apnea (CA) event.

But yes, the S9 does record clear airway events.

Matty wrote: What is acidosis

The medical community uses different phrases and terminology in different parts of the world. This is what my take on that is. First off the body has an internal ph (acid/base balance) that it operates best in. Certain conditions can cause that balance to be off. Diet, metabolic disease and breathing are among those. If someone retains CO2 from lung disease such as COPD, that can cause a respiratory acidosis.

If a person has retained CO2 from hypo-ventilation (not breathing enough or deeply enough) or has a problem with central apneas (which are not treated with a regular cpap machine)...then there are more sophisticated machines that are used to treat those conditions. Auto servo ventilator or avaps are two examples though each for different conditions.
Jamis

JohnBFisher wrote:However, since the S9 only uses breathing data, it can not accurately determine if the CA event is a central apnea or not. You might not have been asleep. For instance, when we toss and turn in the night, we often hold our breath. That is *not* a central apnea, since we are awake. But it would register as a clear apnea (CA) event.

But yes, the S9 does record clear airway events.

Except for the awake/asleep difference, I think Resmed would strongly disagree with you with regard to the S9 series and CAs. That's why they label those apneas as Central Apneas in Resscan and in their literature. You can read their discussion and research results here:
http://www.resmed.com/us/assets/documen ... -paper.pdf
Here's the conclusion in the paper.

The enhanced AutoSet algorithm on the S9 AutoSet now includes CSAD [edit: Central Sleep Apenea Detector] for the classification of apneas using the FOT [edit: Flow Oscillation Technique]. CSAD was extensively tested using patient simulators, normals simulating obstructive and central apneas and clinical trials. CSAD correctly identified and the enhanced AutoSet correctly treated obstructive, central and unknown apneas with a very high degree of accuracy. The enhanced AutoSet and CSAD algorithms have been shown to treat patients appropriately, including those with predominantly central apneas, and without causing disturbance to sleep.

The paper doesn't say anything about holding breath as you mention. I suspect those would be labelled as unknown. In that paper Resmed comes across pretty adament that with 95% accuracy what they say is a Central is in fact a Central Apnea. That's why I offer the conjecture in Nate's topic about the APAP Adapt that one reason the Adapt doesn't distinguish between OA and CA is because Resmed strongly believes they accurately define Centrals, but that accuracy can't be demonstrated in the Adapt. So to avoid the confusion that would result by using a clear airway designation in the Adapt, and central apnea designation with the Autoset, they choose to not use CA with the Adapt.