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Metabolic acidosis in chronic kidney disease — ABIM Board MCQ

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HardNephrologyMetabolic acidosis in chronic kidney diseaseABIM Board

A 69-year-old with CKD G4 has serum bicarbonate 17 mEq/L on repeated tests, potassium 4.8 mEq/L, normal anion gap and progressive muscle wasting. She is euvolemic. Which treatment is indicated?

Educational content. Not a substitute for clinical judgement or local policy.

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Correct answer: EStart oral sodium bicarbonate with volume-status monitoring

The best answer is “Start oral sodium bicarbonate with volume-status monitoring”. Persistent metabolic acidosis in CKD contributes to muscle catabolism and may accelerate progression. Oral alkali is appropriate with surveillance for sodium-related hypertension or volume overload. Acetazolamide worsens bicarbonate loss, fludrocortisone promotes sodium retention, severe protein restriction is harmful, and arterial pH is not required to recognize repeated low bicarbonate.

Reference: KDIGO 2024 CKD Guideline: https://kdigo.org/wp-content/uploads/2024/03/KDIGO-2024-CKD-Guideline.pdf