JOURNAL ARTICLE
MULTICENTER STUDY
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Use of intravenous gamma globulin and corticosteroids in the treatment of maternal autoantibody-mediated cardiomyopathy.

OBJECTIVES: This study sought to evaluate the outcome of maternal autoantibody-mediated fetal cardiomyopathy/endocardial fibroelastosis following intravenous gamma globulin (IVIG) and corticosteroid therapy.

BACKGROUND: We have previously shown that 85% of fetuses and infants with maternal autoantibody-mediated fetal cardiomyopathy/endocardial fibroelastosis suffer demise or need for transplant. In an attempt to improve this outcome, in 1998, we began to empirically treat affected patients with IVIG and corticosteroids.

METHODS: We reviewed the clinical records and echocardiograms of 20 affected patients encountered in our institutions and treated with IVIG and corticosteroids from 1998 to 2009.

RESULTS: All 20 were initially referred at a median gestational age of 23 weeks (range 18 to 38 weeks). Nineteen mothers were anti-Ro antibody positive, 8 anti-La antibody positive, and 7 had clinical autoimmune disease. Endocardial fibroelastosis was seen in 16 and was not obvious in 4 others with reduced ventricular function, and 16 (80%) had reduced or borderline ventricular shortening fraction (≤30%) before or after birth. Eighteen had atrioventricular block at referral (16 in 3°). During pregnancy, maternal IVIG was given in 9 and dexamethasone in 17. After birth, 17 infants received IVIG (n = 14) and/or corticosteroids (n = 15). Twelve underwent pacemaker implantation. Four with hydrops at presentation died perinatally, despite initial improvement in function in 3. At a median follow-up of 2.9 years (1.1 to 9.8 years), 16 (80%) patients are currently alive with normal systolic ventricular function and 6 are not paced.

CONCLUSIONS: Treatment of maternal autoantibody-mediated fetal cardiomyopathy/endocardial fibroelastosis with IVIG and corticosteroids potentially improves the outcome of affected fetuses. Further studies are needed to determine the optimal dose and timing of IVIG administration.

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