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We describe 3 years follow-up of glyburide therapy in a child with permanent neonatal diabetes mellitus (PND) born to a 19 year-old mother with congenital diabetes mellitus. Genetic analysis identified a KCNJ11 mutation (R201H) in both the child and her mother. After 2 years of insulin therapy, the patient was switched to oral glyburide. After initial stabilization, glyburide therapy resulted in a marked decrease in glucose excursions in comparison to insulin. The patient had 3-10 episodes of hypoglycemia per week, including a total of eight episodes resulting in seizures, while on insulin. In contrast, no severe hypoglycemia was reported on glyburide. The patient's basal C-peptide was undetectable on insulin therapy (&lt; 166 pmol/l) but was easily detectable on glyburide (189-761 pmol/l). The range of HbA1c improved significantly from 8-12% on insulin to 4.7-6% on glyburide. The frequency of glucose monitoring was gradually decreased from 4-8 times to 2-3 times a day on oral glyburide. This report confirms the superiority of sulfonylurea therapy in the treatment of PND with Kir6.2 mutations and shows sustained improved glycemic control over a 3-year follow-up period. Genetic exploration in other family members with diabetes might provide further insight into the nature of familial neonatal diabetes.

Familial Permanent Neonatal Diabetes with KCNJ11 Mutation and the Response to Glyburide Therapy - A Three-Year Follow-Up