Anti-GBM Disease Prognosis

Primary GNmedium

A 45-year-old man is diagnosed with anti-GBM (Goodpasture) disease. Which factor at presentation is most predictive of the likelihood of renal recovery?

  1. A.Dialysis dependence at presentationCorrect
  2. B.Presence of pulmonary (alveolar) hemorrhage
  3. C.Patient age at the time of diagnosis
  4. D.Peak serum anti-GBM antibody titer

Explanation

The severity of kidney injury at presentation is a major predictor of renal recovery in anti-GBM disease. Dialysis dependence together with extensive irreversible biopsy injury (for example, 100% crescents or >50% global glomerulosclerosis in an adequate sample) predicts a very low chance of dialysis independence. However, dialysis dependence alone should be interpreted together with biopsy findings and pulmonary hemorrhage. KDIGO still recommends aggressive therapy when pulmonary hemorrhage is present; in a dialysis-dependent patient without pulmonary hemorrhage and with the severe irreversible biopsy pattern above, the risks of cyclophosphamide/glucocorticoids/plasma exchange may outweigh renal benefit. Anti-GBM relapse is uncommon in isolated disease, so routine maintenance immunosuppression is not required.

Why each option

A.
Correct. Presenting creatinine/dialysis dependence (with crescent burden) is the strongest determinant of renal recovery.
B.
Incorrect. Alveolar hemorrhage drives acute management and plasma exchange but does not predict renal recovery.
C.
Incorrect. Age is not a major determinant of renal recovery in anti-GBM disease.
D.
Incorrect. Antibody titer correlates poorly with renal recovery, though seroconversion guides therapy duration.

Reference: KDIGO 2021 Clinical Practice Guideline for the Management of Glomerular Diseases. Kidney Int. 2021;100(4S):S1-S276.

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