title: Methimazole associated neutropenia in a preterm neonate treated for hyperthyroidism.
abstract: Maternal Graves' disease is relatively uncommon with an estimated incidence of 0.4%-1% of all pregnancies, but only 1-5% of newborns delivered to mothers with Graves' disease develop overt clinical signs and symptoms of hyperthyroidism. Here, we describe a case of a 1380-gram female neonate who was born at 30-week gestation to a mother with Graves' disease. Our patient presented with hyperthyroidism followed by transient hypothyroidism requiring treatment with levothyroxine. While hyperthyroid, she was treated with methimazole, iodine, and a beta-blocker. 20 days after the initiation of methimazole, she developed neutropenia. The neutrophil counts started to improve immediately after the initiation of the weaning of methimazole. To the best of our knowledge, this is the first case reported in the literature of methimazole induced neutropenia in a preterm infant being treated for neonatal Graves' disease.
authors: St. Christopher's Hospital for Children, Drexel University College of Medicine, Philadelphia, PA 19134, USA ; Division of Neonatology, Department of Pediatrics, Texas Tech University Health Sciences Center, Odessa, TX 79763, USA.
authors: Dimitrios
authors: D
authors: Angelis
authors: St. Christopher's Hospital for Children, Drexel University College of Medicine, Philadelphia, PA 19134, USA.
authors: Rita Ann
authors: RA
authors: Kubicky
authors: St. Christopher's Hospital for Children, Drexel University College of Medicine, Philadelphia, PA 19134, USA.
authors: Alan B
authors: AB
authors: Zubrow