Experiencing BiPAP ASV

I’ve used my BiPAP machine for a bit over a week.

During the first few days the machine behaved in very interesting ways (compared to my CPAP machine).

-a- Whenever I took too long to breath in, the machine took it onto itself to give me a PUSH of air.
-b- Whenever I tried to breath in too much, the machine seemed to restrict my breath.

It was interesting playing with these operations. I would purposely hold my breath at the end of an exhale and count to see how long it would take to execute a PUSH, and I would count on the inhale to see how long it gave me to intake air.

You see, when I’m conscious or when I’m trying to get to sleep I like to execute long breaths in and long breaths out.

After a few days, the operation of the machine seemed to change (the AHI went up also). Instead of acting as strictly as it had initially, it seemed to drop its strict monitoring and operate much more like my CPAP machine. I was simply allowed to breath provided my breaths were relatively shallow. The differences were noticeable (over the last two nights). The machine had stopped acting in as disciplined a way as it had initially. Later in the evening I noticed that there were times the machine would execute a PUSH and pull, but it was never like the first few evenings.

Is this the way BiPAP machines work? Do they somehow read one’s breath pattern and adopt themselves to what they perceive should be a better/different pattern?

That's the way ASV works.. it monitors your breathing and adapts accordingly. Bipap is just two pressures. I've noticed when I take a breath longer than usual.. the machine kinda speeds up to keep pace. I remember when I first started I would hold my breath to see what it would do as well. Took awhile to learn how to talk to my wife while hooked to the machine as well.. but if you time it right.. you can do it

But does it change its behavior based on your behavior? In other words, if you continuously breath longer and deeper, does it act differently/accordingly?

I believe it does actually. I had an issue with bipap.. because it didn't match my breathing pace. I don't notice it with ASV.. and I didn't try breathing different to adapt.