What is an APL valve

Leave the archive and display this page in the standard design: APL valve on the ventilator

Hi folks, I have a question for the anesthetists among you.

The APL valve on the anesthesia machine is used in manual mode to limit the pressure in the expiratory limb of the circle part?


If I ventilate manually, I set myself a pressure of 15-20 mbar and can comfortably bag (if there is a leak or something else, I can turn the valve even more if necessary -> risk of air insufflation into the stomach).
How is it now with a spontaneously breathing patient when I open the APL valve completely (approx. 0 or 1.5 mbar) he can breathe in and out without any problems. If I turn it off now (approx. 80 mbar), then the patient can breathe in without any problems, but expiration would only be possible with extreme effort against the pressure built up in the circle part ?!
Do I see it correctly or do I have a mistake in my considerations?

Thanks in advance.

you see right!

tip: just take a clean filter and mask and test it out yourself. I did too.

In the last year of my anesthesia, I had patients with pulmonary complaints preoxygenated against a moderate peep (3-5 mbar). but only if they tolerated it well.

With the correct flow rate of o2 and the correct pressure (I also usually took your 15-20 mbar), you usually don't have to readjust a lot. in the case of "leaky faces" (without teeth, wrinkled etc.) it is better to set the valve and the flow a little higher and if the mask seat is better than expected, simply tilt the mask and release a little pressure, so you don't have to readjust when you don't have that much routine and have to keep an eye on other things (cycle, delegation, etc.).

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