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Postpartum LN Flare MMF Breastfeeding Decision — ESENeph MCQ

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HardPregnancy & RenalPostpartum LN Flare MMF Breastfeeding DecisionESENeph

A 30-year-old woman with lupus nephritis on MMF and prednisolone presents 6 weeks postpartum with worsening proteinuria (uPCR rises from 60 to 350 mg/mmol), haematuria, falling complement C3/C4, and rising anti-dsDNA. She is breastfeeding. She had stopped MMF at conception and was maintained on azathioprine through pregnancy. What is the priority management decision?

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Correct answer: E — Restart MMF and stop breastfeeding

This is a postpartum lupus nephritis flare (rising proteinuria, active sediment, serological activity). MMF is the appropriate induction agent but is CONTRAINDICATED in breastfeeding — it is excreted in breast milk and could cause immunosuppression in the infant. The patient must be counselled that restarting MMF requires stopping breastfeeding. This is a difficult but necessary conversation. Azathioprine alone at current dose is insufficient for active LN flare. Cyclophosphamide would also require stopping breastfeeding and is more toxic. High-dose prednisolone alone is less effective than MMF-based induction for proliferative LN.

Reference: KDIGO 2024 – Lupus Nephritis Guideline; BNF 2024 – MMF Breastfeeding Contraindication; BSR 2017 – Prescribing in Pregnancy and Lactation