Sierra

This is what SleepyHead says for meters. Suspect OSCAR is similar.

Many people with new CPAP machines like the ResMed AirSense 10 and the MyAir app think that all their data is being uploaded and "someone" is monitoring their results. Yes, very basic summary data is being uploaded, and your provider can (should) be looking at it. However, I suspect in reality that is not all that common. The other fact of life is that the real detailed data is only being collected on your SD card, and if nobody backs it up onto a PC, and you have a card failure, or reformat, or as I have done, put it in the wrong CPAP machine, then that data is all gone.

My advice would be if your monthly average for AHI is 12, then you need some further investigation. It may be something as simple as the maximum pressure is too low, the minimum pressure is too low, or you are suffering from central apnea and may need a new machine, or an underlying cause of the apnea investigation.

OSCAR is one way to do it. The other is to bring your SD card into your provider and ask them to do a though analysis of it, and explain to you why your AHI is so high. The goal is to be under 5.

And a DreamStation costs about $600, while an Inspire device costs in the $50,000 range if I recall correctly.

So, first, which AirSense model do you have? The very basic AirSense 10 CPAP does not record any detailed data. The AirSense 10 Elite does record, as does the AutoSet model.

Assuming both machines were/are capable of recording detailed data, I would first download OSCAR software, and then transfer the data from your old machine into OSCAR. You will need a PC or Mac and a SD card reader. Once you have transferred your old data to OSCAR it will be saved. Then you can format the SD card, or just delete all the files, and put it into your new machine. When you transfer the data from the new machine it will be added to your existing records, and the starting point of the new machine will be indicated. It will be shown as a new machine with a new serial number.

The SD card will have much more detailed data than you have in MyAir. That is just high level summary data. If you follow this process it should be easy to determine what may have changed between the old machine and the new. For example you will see in detail second to second how much your mask is leaking and to what degree. See my daily report from last night. The bottom graph is the leak rate during the night. The red line shows the 24 limit, and I try to keep my time over the leak red line close to zero. This is a compressed graph which can be greatly expanded to the point where you can see each apnea even in second to second detail, and see the machine testing for the type of apnea it is.

Oh, and one other point, is that not all machines can distinguish between obstructive apnea and central apnea. Unless they have improved recently the Fisher and Paykel machines cannot tell the difference. For that reason they should never be used with someone who is experiencing central apnea. If the machine does not know enough to tell the difference and increases pressure in response to a central apnea, it could make it worse, not better. DreamStation and ResMed machines however can both tell the difference.

Here is another document you may find of interest:

ResMed Innovation and Technology

The advantage of detecting central and obstructive apnea with a sleep test is that it is done without supplying any pressure. CPAP machines maintain a minimum pressure of 4 cm of water, and in most treatment cases much higher than that. So that pressure can reduce the frequency of obstructive apnea, and may even increase the frequency of central apnea. So if you want to know the degree of apnea without any treatment pressure, then the CPAP cannot do it, like a sleep test can. However if you are under CPAP treatment and just want to measure how well controlled central and obstructive apnea is, the machine can certainly do it.

Here is a link to a manual. It explains how it works. Essentially the machine pulses the flow at a high frequency and checks to see if the pressure goes up when the flow goes up. If it does, it concludes the event is a an obstructive apnea. If the pressure does not change significantly, it concludes the airway is clear. The CPAP manufacturers call them clear airway events, probably for legal purposes, but for all practical purposes they are central apnea events.

You may want to check what meters that OSCAR supports. It would seem useful to correlate apnea data to oximetery data.

It is an open source software that is the successor to SleepyHead, on which development was discontinued. I still use SleepyHead, but it is not available for download any longer. It requires a PC or Mac and a SD card reader, and that your CPAP is compatible with the software. Most ResMed and DreamStation machines are, except for the very basic fixed pressure CPAP machines. You can download it at the link below. It allows you to look at all the detailed data that is being captured on your SD card.

OSCAR download

One thing to check for is the amount of CA events compared to total AHI. Central apnea can be somewhat erratic.