CPAP to BIPAP - Changing event definition? Increased events/hour?

I just transitioned from a Resmed CPAP machine to a Resmed BiPAP (Airsense10) machine. I was registering 4 to 6 events per hour on the CPAP device, and now after three nights I'm getting 20 events per hour with BiPAP. Why might this be?

Does the BiPAP machine register events differently or more sensitively?

I also changed mask types to from Airfit f20 (CPAP) to Airfit F30 (BiPAP). Could this have changed the number of events?

I feel like the fit is better, I'm sleeping MUCH longer with the mask (4 to 5 hours before under CPAP, 7 to 8 hours comfortably now.)

I was told with CPAP that the goal was under 5 events per hour. Presumably that is still the goal with BiPAP? Or is it?

So what might be going on with the apparent increase in events using a BiPAP with a new (and seemingly better) mask?

17 to 20 events per hour is a little worrisome... or maybe it was always there but the CPAP machine was only partly registering them?

Thanks!

Welcome to the forum. First I think we should clarify the machine types. A ResMed AirSense 10 is actually a APAP, not a BiPAP. ResMed calls their BiPAP machine the AirCurve 10. So do you have an AirCurve 10 or AirSense 10 AutoSet? And what specific CPAP machine did you have before?

Regardless of the type of machine you switched to, the frequency should not be taking such a jump upwards. Do you what pressure the CPAP was set at? And what pressure range the new machine is set at? The standard for treatment is still to be less than 5 and ideally under 1 if practical.

If you can clarify details about your machine and the pressures, I can probably narrow down what the issue might be.

Thanks, and sorry about the inexactitude on my part.

The CPAP machine was "Resmed AirSense 10 autoset" and was set to something like 10 low/ 15 high (if I recall correctly.)

The new BiPAP machine is "Resmed AirCurve 10 vauto" (that's the tag on the carrying case)... but the picture inside suggests that it is part of the AirSense 10 series) (as distinct from another picture that shows the "S9 series" which this is not an example of.)

The manual is for the AirCurve 10. The tag on the bag supports it being the "vauto" model.

The report screen shows 8.8 low and 12.8 high (which I presume is based on the recent sleep study I did. My understanding is that that is exhale and inhale maximum pressure? I recall that the sleep technician told me that my max pressure to open my airway was about 13 (what are the units we are talking about by the way?)

I did achieve around 5 events per hour with the old machine. The new one has produced three nights of 20, 20 and 17 on first three nights of use).

In spite of that, I am sleeping better because the new airfit F30 mask is so much more comfortable without the pressure on my nose bridge.

Does that provide you with helpful info? Thanks!

You may want to also download the Clinical Guide for the AirCurve 10 VAuto. See the link below and click on the link with this name. The site is in Italian (I think...) but the Clinical Guide PDF is in English. Clinical guides are hard to find on the net.

AirCuve 10 VAuto Clinical Guide

Unfortunately the data that is sent by WiFi is very limited. You will be able to see pretty much the same thing by looking at the sleep report on the machine itself. The data you can download with OSCAR is much more detailed. If you could post a screen from OSCAR I could determine much more about how your machine is set up, and what the problem might be.

Do you know the breakdown of your total AHI? How much is obstructive (OA events), and how much is central apnea (CA events). They are quite different issues. Most of my events are CA or central apnea events. You can see them as the magenta flags in the screenshot. OA events for me are less frequent. They are the light blue ones. I have progressed from that screenshot I posted above to much better outcomes more recently, like the one shown below.