I guess the driving pressure is affected/changed by pt's O2 saturations, since peep is involved! So, I guess it is safe to say that before calculating driving pressure and Vt for "a" DP, "NOT" the Pt's IBW, we have to first find out what the O2 sats are in order to set the right peep and Fio2, before we can actually calculate an acceptable Vt for that driving pressure according to the lungs' stiffness or compliance?! So, that means, that Vt not only depends on setting that person's IBW VT as a normal lung at that weight, "BUT", also depends on the "stiffness or elastance" of those lungs since we have to open them with PEEP, which affects DP that we can calculate and use for better ventilation. In summary; I think, first start with Vt on IBW, then calculate Vt with DP according to Lung Compliance! ( HM!!!! pretty sneaky!!!!!! ha!!??) Am I right? Not sure!
Since we don't know the person's Static Cl on first time on ventilator 'cause we don't know the status of his/her lungs. I guess it's safe to say that we can start with a Vt bases on IBW "THEN" calculate Static Cl, plateau, and Driving Pressure to finally get the right Vt and ventilating pressures? And then do the changes needed, do abg's and confirm?
Sir what is a normal platue pressure for us without ventilation what dose it tell ...is it intra alveolar pressure at inspiratory pause or trans pulmonary which is intraalveolar minus intraplural pressure
