Initiation of hydroxychloroquine therapy during pregnancy can cause adverse effects and alter pregnancy outcomes: A case of acute generalised exanthematous pustulosis induced by hydroxychloroquine in a patient with systemic lupus erythematosus.

Abstract

Hydroxychloroquine (HCQ) is effective for treating a number of autoimmune diseases, including systemic lupus erythematosus. HCQ is generally safe and may be prescribed to pregnant women. Although current guidelines recommend initiating HCQ when considering pregnancy, the drug can cause adverse effects such as acute generalised exanthematous pustulosis (AGEP), which should be carefully evaluated. A 30-year-old pregnant woman with systemic lupus erythematosus at 16 + 5 gestational weeks was referred to National Center for Child Health and Development for persistent proteinuria and alopecia. Tacrolimus was initiated, and the dose of prednisone was increased. At 20 + 3 weeks of gestation, HCQ was administered to allow for a dose reduction of prednisolone. Proteinuria gradually improved as the pregnancy course stabilised. At 27 + 1 weeks of gestation, generalised pustular exanthema developed, presumably due to HCQ. Based on the clinical course and the analysis of the skin lesions, she was diagnosed to have either AGEP or generalised pustular psoriasis. Despite discontinuing HCQ, the skin lesions worsened dramatically, and infliximab therapy was required. After one course of infliximab treatment, exanthema gradually subsided. The final diagnosis was AGEP, based on the clinical course and pathological findings. At 30 weeks, pyothorax developed because of the pyogenic skin lesion and the compromised immune system, and long-term antibiotic therapy was required until 32 + 4 weeks, after which she underwent caesarean section. Although introducing HCQ is occasionally necessary during pregnancy, it is preferable to initiate HCQ in the preconception period and not after pregnancy because of the possible adverse effect, which can alter perinatal prognosis. Rheumatologists should consider the potential risks of HCQ.