A pаtient with аdvаnced chrоnic оbstructive pulmоnary disease is admitted to the ICU. The patient is placed on 24% air entrainment mask and has a pulmonary artery catheter inserted. PVR 720 dynes PaO2 57 torr The physician orders an increase to 28% oxygen via air-entrainment mask, after the increase in O2, PVR 400 dynes PaO2 72 torr What would you recommend?