What will the estimated Pa02 after giving Fi02 at 0.5 in a normal person?: (A) > 50 mmHg, (B) > 100 mmHg, (C) > 150 mmHg, (D) > 200 mmHg
Answer is D. Answer- D. > 200 mmHgln normal person, the measured PA O2 should equal to 5 x FiO2 . For example, a patient breathing 40% O (FiO2 of 0.4) should have a PaO2 5 x 40 = 200 mmHg. A PA O2 less than 4 to 5 times the FiO2 suggest poor lung function or hypoventilation.