A patient was admitted for a bowel obstruction and has had a nasogastric tube set to low inter-mittent suction for the past 3 days. The patient's respiratory rate has decreased to 12 breaths per minute
The nurse would expect the patient to have which of the following arterial blood gas values?
a. pH 7.78, PaCO2 40 mm Hg, HCO3– 30 mEq/L
b. pH 7.52, PaCO2 48 mm Hg, HCO3– 28 mEq/L
c. pH 7.35, PaCO2 35 mm Hg, HCO3– 26 mEq/L
d. pH 7.25, PaCO2 47 mm Hg, HCO3– 29 mEq/L
ANS: B
Compensated metabolic alkalosis should show alkalosis pH and HCO3– (metabolic) values, with a slightly acidic CO2 (compensatory respiratory acidosis). In this case, pH 7.52 is alkaline (normal = 7.35 to 7.45), PaCO2 is acidic (normal 35 to 45 mm Hg), and HCO3– is elevated (normal = 22 to 26 mEq/L). A result of pH 7.78, PaCO2 40 mm Hg, HCO3– 30 mEq/L is uncompensated meta-bolic alkalosis. pH 7.35, PaCO2 35 mm Hg, HCO3– 26 mEq/L is within normal limits. pH 7.25, PaCO2 47 mm Hg, HCO3– 29 mEq/L is compensated respiratory acidosis.
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