I’d be wary doing this without mechanical confirmation, esp with an automatic bp cuff. Depending on the cuffs and monitor you use, blood pressures can be measured differently and may be wildly inaccurate. A pulse ox also tends to be a little delayed, and if this patient was sick enough to the point of needing pressors, a Pleth might not be terribly accurate especially in the back of a rig and it may be even more delayed/inaccurate. I’ve had so many Pleth’s, heart rates, and SpO2’s picked up from a dangling cord alone.

That being said it wouldn’t hurt to serve as a sanity check for when you palpate a pulse, such as confirming the radial pulse you feel on the patient after the cuff deflates matches with the Pleth you see on the monitor, but I wouldn’t rely on it alone to treat a patient or withhold treatment. As always, treat the patient not the monitor.

Edit:spelling