A pulmonary artery occlusive pressure (wedge) is best done after any therapeutic intervention to determine its effectiveness. Also the lifespan of the balloon is only 72 wedges. The paop should be compared to the pad and determine if they are correlating. A pad may be used to determine the paop. All paop should be read from the end expiration. A patient that is not vented should be read at peak, and a vented patient at valley. (P-peak (patient) and V-valley (vent). A PA line can be a very handy determinate of patient therapy--but only if read right. Good luck with determining a policy. A PAOP should be read with interventions. On our unit, with tailored therapy for our cardiomyopathy patients, these measurements provide a guide for medications. That is exactly how all PA pressures should be done! :)