5. Subject 5 is a 21 year old BSU student who has the following values at baseli

Question

5. Subject 5 is a 21 year old BSU student who has the following values at baseline: PaO2 54 mm Hg, PaCO2 = 60 mm Hg while breathing FIO2 = 0.21 @ PB = 690 mm Hg. A Respiratory Therapist administers additional oxygen with an FIO2 = 0.4. Identify whether each of the following are correct or incorrect.

a. At baseline, the PaCO2 is within normal limits

b. At baseline, the PaO2 is within normal limits

c. At baseline, the value for PaO2 explained by hypoventilation alone

d. The a/A ratio is consistent with low V/Q or shunting

e. Administration of oxygen will result in a decrease in PaCO2 proportional to the increase in PaO2

f. Administration of 40% oxygen would be expected to result in a PAO2 = 257 mm Hg

Explanation / Answer

a. No. Partial pressure of carbon dioxide (PaCO2): 38 to 42 mm. It is 60mm hg that means it increases acid level in the blood that leads respiratory acidosis

b. No PaO2(partial pressure of arterial oxygen) irrespective of age is greater than 80 mmHg is normal

Mild Hypoxia = if PaO2 between 60-70, Since this student has PaO2 54mm hg it is a Hypoxic condition.

c. Correct (As per A answer the current baseline PaO2 indicates hypoventilation)

d. Correct (The A-a oxygen difference increases with age. It is primarily due to age-induced decrease in the PaO2 level because of the rise in V/Q mismatch. )

e. Correct it decreases hypoventilation.

f. Incorrect, if person is able to breath 60% only the PAO2 is about 250mm hg additionally if we administer 40% that would be more high

For your info the calculation of PAO2 is

PAO2 = FiO2× (Pb PH2O) (PACO2/R).

          =0.21 *(690-47)-(60/0.8)

         =0.21 * 643-75

        =0.21*568

       =119.28mm hg

c

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