A 53-Year-Old,80-Kg Patient Is Admitted to the Cardiac Surgical Intensive

A 53-year-old,80-kg patient is admitted to the cardiac surgical intensive care unit after cardiac surgery with the following arterial blood gas (ABG) levels.What is the nurse's interpretation of these values?
pH 7.4
PaCO₂ 40 mm Hg
Bicarbonate 24 mEq/L
PaO₂ 95 mm Hg
O₂ saturation 97%
Respirations 20 breaths per minute

A) Compensated metabolic acidosis
B) Metabolic alkalosis
C) Normal ABG values
D) Respiratory acidosis