flow limitations acceptable levels

[paulag1955]

Thanks.

[ahuman]

Dr. Barry Krakow recommended and worked to engineer "normal breathing"

Once AHI and flow limitations are low, can you explain the titration and adjustment process you used to improve flow rate shape?

[G. Szabo]

https://www.youtube.com/watch?v=Syv7YcHb...=1&t=1409s

Thank you for this link, which points to the most enlightening presentation I have seen.

[ahuman]

Is he saying ASV is always superior to ABPAP? Is there an objective means to measure REM consolidation without an in-lab titration study? Which sleep labs do this level of study?

[G. Szabo]

Is he saying ASV is always superior to ABPAP? 

I believe so.

[ahuman]

Is this due to the pressure and volume of air being delivered differently and how that impacts expiratory resistance?
ASV - variable PS with varying pressure and (nearly?) constant volume, least expiratory resistance
ABPAP - fixed PS with varying pressure and volume - volume better maintain by PS, less expiratory resistance
APAP - varying pressure and volume

Not sure that understanding is correct? How does ASV maintain volumes?

[G. Szabo]

 How does ASV maintain volumes?

ASV has proprietary software that does more than maintain volumes. But our experts might elaborate on some more details.

[CPAPfriend]

ahuman

Resmed ASV algo aims for constant minute ventilation and Phillips ASV for constant tidal volume, I believe. Could be vice versa. Minute ventilation is respiratory rate multiplied by tidal volume, and so is a function of volume.

ABPAP is auto-bilevel. Can auto PS and pressure. ASV is breath-by-breath changes in IPAP, also capable of adjusting EPAP to eliminate events, plus backup rate.