A client in the emergency department (ED) has baseline arterial blood gas (ABG) of pH 7.35, PaCO2 60 mm Hg, HCO3-35 mEq/L and PaO2 60 mm Hg. Which interpretation should the nurse conclude when analyzing these findings? Reference Ranges: Arterial Blood Gas pH [7.35 to 7.45] PaCO2 [35 to 45 mm Hg] HCO3- [21 to 28 mEq/L (21 to 28 mmol/L)] PaO2 [80 to 100 mm Hg]

A. Compensated respiratory acidosis with hypoxia: The pH is at the low end of normal (7.35), PaCO₂ is elevated (60 mm Hg), and HCO₃⁻ is also elevated (35 mEq/L), indicating the kidneys are compensating for chronic respiratory acidosis. The PaO₂ is low (60 mm Hg), confirming hypoxia. B. Compensated respiratory alkalosis with normal oxygenation: Respiratory alkalosis would be indicated by a high pH and low PaCO₂, which are not present here. Also, the client is hypoxic, not normally oxygenated, as shown by the PaO₂ of 60 mm Hg. C. Acute respiratory acidosis: In acute respiratory acidosis, the PaCO₂ would be high with a low pH and little to no elevation in HCO₃⁻. The elevated HCO₃⁻ here shows that compensation has occurred, indicating the condition is not acute. D. Normal acid-base balance: Although the pH falls within normal limits, the PaCO₂ and HCO₃⁻ are significantly abnormal. The body has compensated for the respiratory acidosis, but the acid-base balance is not normal due to the underlying pathology and associated hypoxia.