On admission, a patient presents as follows: pH, 7.38; respiratory rate, 24 breaths/min, regular, pursed-lip breathing; PaO₂, 66 mm Hg; heart rate, 112 beats/min, sinus tachycardia; PaCO₂, 52 mm Hg; blood pressure, 110/68 mm Hg; HCO₃, 34 mEq/L; and SpO₂, 90% on O₂ 2 L/min nasal cannula.These gases show

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The pH is closer to the acidic level, so the primary disorder is acidosis.Compensated respiratory acidosis values include a pH of 7.35 to 7.39, PACO₂ greater than 45 mm Hg, and HCO₃ greater than 26 mEq/L.Uncompensated respiratory acidosis values include a pH below 7.35, PACO₂ above 45 mm Hg, and HCO₃^-of 22 to 26 mEq/L.Compensated respiratory alkalosis values include a pH of 7.41 to 7.45, PACO₂ below 35 mm Hg, and HCO₃ below 22 mEq/L.Uncompensated metabolic alkalosis values include a pH above 7.45, PACO₂ of 35 to 45 mm Hg, and HCO₃^- above 26 mEq/L.

On Admission, a Patient Presents as Follows: PH, 7