you can always turn the apap off and go straight cpap. What the heck is so complicated about this approach?
Fred, I agree absolutely. A versatile autopap machine that can always be easily set to simple CPAP if "straight pressure" is what's needed makes sense to me.
Personally, I've never experienced a pressure "runaway" with either. Thinking about it, I'm not sure I even know what that means. Does it mean that the pressure keeps going up to the upper apap limit for no apparent reason?
Yes, that's what it means. Pressure running up to the top and pretty much staying there for no apparent reason, or more precisely, for no "good" reason. Runaways that are not being caused or continued by leaks of any kind.
The 420E auto that I dearly loved did that (pressure climbing and staying at whatever upper pressure I had it set for, even 19!!) until -SWS looked at my data and suggested I turn off IFL1 in the advanced settings. From that point on, the 420E behaved perfectly for me -- staying down around 9 or 10 most of the time.
Later, I bought a REMstar Auto from a lady who no longer needed it. She was having success with a dental device and was selling all her year-old "cpap" equipment. I had been following her posts for some time about her trials and tribulations not getting effective treatment, trying many different masks, and many different pressure settings.
On the REMstar auto she was experiencing constant pressure runaways...pressure climbing to whatever upper pressure she set. Same way the 420E had been doing me. Happily her REMstar never did a runaway with me.
I've read people reporting that the ResMed Spirit auto has done "runaway" pressure for them if the humidifier water chamber was filled above the "fill-line". I think I've also read that the Spirit's aggressive reaction to snores can also do it for a few people.
So, yes, pressure runaway on any autopap can and does happen for
some people. That's why I think it's a good idea to keep a leash on the upper pressure setting... setting it no more than a few points above a person's titrated pressure, especially when using a new brand of autopap that you haven't tried before.
Helps also to have the software to take a look and see that the margin you've set at the top indeed does not have to be used. I want the extra cm's up there to be there for "just in case" I need more than usual on some night....not be a pressure the machine generally uses for me.
I'll hasten to say that it is
unusual for "runaway" pressure to happen. Most autopaps work fine for most people, just as the two you're using are doing for you, Fred. Just because runaway pressure scenarios can happen to a few people (and did for about a month for me until I made a setting change) does not make me shy away in the least from using any autopap and recommending that others use them.
As with news, our ears tend to perk up and notice "bad news", paying little attention to good news. In the same way, I'd say people should NOT worry about the possibility of "pressure runaway" with autopaps.
Most people report getting wonderful treatment from their autopaps. I sure do.
A
few might experience pressure runaway, but it's usually easily remedied if you know what to do.
Or.... just switch the machine to straight cpap.
All said and done, I do think the reluctance and/or refusal of some medical professionals to prescribe autopaps (for whatever their reason) is a disservice to the many who might get
much more comfortable treatment from an autopap rather than the straight cpap they're on.
I'm not a doctor, but I don't see how it could hurt to at least
try other types of machine, be it cpap, bi-level, or autopap, to see what suits the person best. Any machine, no matter how advanced, can be set to straight cpap at any time, just as Fred said.