BiPAP SV vs. AVAPS

I'm struggling to get some understanding of BiPAP SV and AVAPS. I remain confused. Can someone explain these (down on my level!) or give a reference?

jmayer180 wrote:I'm struggling to get some understanding of BiPAP SV and AVAPS. I remain confused. Can someone explain these (down on my level!) or give a reference?

probably not... but I'll try.

bipap SV (or ASV as the inventors (resmed) call it) targets a percentage, something like 90% of your average tidal volume, and increases pressure support on a breath by breath basis to maintain that targeted tidal volume. importantly, your average can, and does, change, so the disadvantage of ASV machines is they can, gradually ramp down to nothing if you have other breathing abnormalities besides simple central apnea.

AVAPS, or iVAPS from resmed is a "Automatic" or "intelligent" Volume Assured Pressure Support, wherein you configure the machine with (in the case of resmed) the patients height, and the machine calculates deadspace volume in the respiratory system, and how much the minimum tidal volume should be for that individual patient, and then it uses pressure support as needed to meet that calculated target of ventilation. it's for people with much more complex respiratory needs than simple sleep apnea.

So do both modalities initiate a pressure wave (breath, if you will) after a set period of no inspiratory effort, i.e. central apneic event? Otherwise, how do they help with clear airway events?

jmayer180 wrote:So do both modalities initiate a pressure wave (breath, if you will) after a set period of no inspiratory effort, i.e. central apneic event? Otherwise, how do they help with clear airway events?

they both have a timed backup rate of some sort whether automatic or set varies with machine.