3. Thirty minutes after intubation and initiation of mechanical ventilation, a patient’s PaO2 = 55 mm Hg and the FIO2 = 0.5. To what should the FIO2 be set to obtain a PaO2 of 80 mm Hg? a. 0.65 b. 0.75 c. 0.85 d. 0.95

Interpret the following PFT result.> Spirometry interpretation> Lung Volume Study> DLCO

56. A 70-year-old man is brought to the emergency department because of severe shortness of breath for 4 hours. He has had fatigue for 6 months and moderate shortness of breath for 2 weeks. On arrival, he is pale and diaphoretic and is seated straight upright on the stretcher. His respirations are 30/min, and blood pressure is 110/90 mm Hg. Inspiratory moist crackles are heard over the posterior lower half of the lung fields. There is mild pedal edema. An increase in which of the following is the most likely cause of this patient's dyspnea? ↑P₂ OA) Capillary diffusion coefficient B) Capillary hydrostatic pressure OC) Capillary oncotic pressure D) Interstitial hydrostatic pressure E) Interstitial oncotic pressure

5. If a patient's PaO2 is 55 mm Hg 30 minutes after intubation and the start of mechanical ventilation, and the FIO2 is at 0.5, at what setting should the FIO2 be adjusted to achieve a PaO2 of 80 mm Hg?a. 0.65 b. 0.75 c. 0.85 d. 0.95.