Which of the following are true if a patient has a PaO2 of 155 mm ...

[cartlidgeashley]

Which of the following are true if a patient has a PaO2 of 155 mm Hg?
 
  1. The patient has mild hypoxemia.
  2. The patient has an overcorrected PaO2.
  3. The patient is in need of supplemental oxygen.
  4. The patient is receiving supplemental oxygen therapy.
  a. 1 and 3 c. 1 and 4
  b. 2 and 4 d. 2 and 3

Question 2

Which of the following arterial blood gas results could be caused by diarrhea?
 
  a. pH = 7.15; PaCO2 = 20 mm Hg; and HCO3 = 7.4 mEq/L
  b. pH = 7.20; PaCO2 = 65 mm Hg; and HCO3 = 26 mEq/L
  c. pH = 7.57; PaCO2 = 22 mm Hg; and HCO3 = 20 mEq/L
  d. pH = 7.49; PaCO2 = 49 mm Hg; and HCO3 = 38 mEq/L

[recede]

Answer to Question 1

ANS: B
When the PaO2 is greater than 100 mm Hg, the oxygen status is considered excessively or overly corrected. A PaO2 of 155 mm Hg is not possible without supplemental oxygen.

Answer to Question 2

ANS: A
Diarrhea can be caused by a metabolic acidosis. Arterial blood gas values in which the pH is 7.15 (acidosis), PaCO2 is 20 mm Hg, and the HCO3 is 7.4 mEq/L are indicative of a partially compen-sated metabolic acidosis. Answer B is an uncompensated respiratory acidosis. Answer C is a par-tially compensated respiratory alkalosis, and answer D is a partially compensated metabolic alka-losis.