A couple of older CRNAs that I know have the rule that if the patient is spontaneous ventilating (i.e. with an LMA in) that your hand should always be on the bag. This will allow you to detect obstruction and closely follow the respiratory pattern. I.e. by the time it comes up the screen it's too later.

Other CRNAs teach that while it's important there is valuable information to be gained this way - that these days, with end-tidal CO2 and tidal volume displays that it is not necessarily poor form to not have your hand on the bag on at all times?

Thoughts? Is this "old-school" or standard practice?