Graves' disease complicating pregnancy.

During the 12-yr period from 1981 to 1992, over 85,000 deliveries at Ramathibodi Hospital from 114 pregnancies (prevalence 0.1%) in 110 patients were complicated by Graves' disease. The diagnosis was made following conception in 52 per cent. Medical treatment with propylthiouracil was the main regimen. Maternal and perinatal outcome were related with thyroid status at delivery including thyrotoxic crisis, preeclampsia and preterm deliveries. There was no case of fetal goitre, hyperthyroidism, but fetal hypothyroidism occurred in 12.2 per cent which calls for close monitoring of antithyroid drug dosage and close neonatal-infant follow-up.