I have been so used working with the Drager ventilator where setting the Phigh and Plow, as well as Thigh and Tlow is easy and intuitive. However in other ventilators particular in the Puritan-Bennett 840 you have to go into settings and use the locks to demonstrate your T low.
Every time I camera in and asked a respiratory therapist, they state that they cannot set T low . This not the case . Also the difference adding PSV is that you have to subtract the difference between Phigh and Plow and then add PS to the pressure difference to set the level of PS you want. This is explained pretty well in the video. Also RR has to be kept between 6-12 BPM ( look at Thigh and Tlow when changing this) and PEFR can be nicely demonstrated, magnified in freeze frame mode. I: E ratio becomes totally irrelevant when PSV is added.
Here is a good summary overview on how to manipulate the various parameters :
APRV Management
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