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I’m a bit puzzled and I would like to know if my understanding is right.

I did some reading to find the difference between an APAP machine and an ASV machine.
Is it true to say that we would all be better with an ASV machine because it can adapt the pressure for each of our breath BUT that our sleep doctors don’t prescribed them first because of the cost difference? 

If someone has the money, would he benefits from getting an ASV machine?  Any bad side effect i don’t understand?

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The primary purpose of ASV is to provide non-invasive ventilation of an individual having a central apnea. Other than that functionality, it is similar to an auto-bilevel (BiPAP/VPAP). While I think these machines are under-prescribed to those that could benefit, I would not encourage anyone without a need to get ASV. As you probably know, we can set up ASV to function as a CPAP, auto CPAP, auto bilevel and of course with a backup rate and pressure support for centrals. I don't think most people have the desire or expertise to deal with ASV, and there are no studies that would support a doctor in prescribing ASV for someone that does not need it. For the few that might pursue it on their own, I don't think there would be much, if any, harm; but why?
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That is one point of view.Relative prices from 1 supplier
ASV $2999 CPAP, ASV, ASV Auto
VAuto $1766 CPAP, BiLevel S, VAuto (Auto-BiLevel)
Autoset $ 883 CPAP, Auto CPAP

Each machine has different modes, different algorithms with which to maximize treatment.

Insurance wants to spend a minimum to treat you. (Minimizes cost)
DME wants to provide the cheapest allowed. (maximizes profit)
The Dr. wants something that treats you effectively (AHI under 5.0)
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Hi vinhuard,
WELCOME! to the forum.!
Good luck to you with CPAP therapy.
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