PEDIATRICS Vol. 57 No. 5 May 1976, pp. 702-711
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Hyperinsulinism in Infancy: Diagnosis by Demonstration of Abnormal Response to Fasting Hypoglycemia

Charles A. Stanley M.D.1 and Lester Baker M.D.1

1 Division of Endocrinology/Diabetes, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania

The metabolic adaptation to fasting in infants with hyperinsulinism was examined to see whether a characteristic abnormality could be found that would aid in the diagnosis of this disorder. Seven infants under 1 year of age with hyperinsulinism were studied; 7 control infants of similar age and 12 children with ketotic hypoglycemia served as contrast groups. At the time of hypoglycemia, four of the seven infants with hyperinsulinism did not have elevated levels of insulin. However, levels of beta-hydroxybutyrate were significantly lower in the infants with hyperinsulinism than in the control and ketotic hypoglycemic groups. Levels of free fatty acids were also lower in the infants with hyperinsulinism. Expected levels and normal limits for beta-hydroxybutyrate, insulin, and free fatty acids when plasma glucose is below 40 mg/100 ml were estimated by combining the control and ketotic hypoglycemic groups. Using these values as standards, the diagnosis of hyperinsulinism can be made by evaluation of the response to fasting hypoglycemia. The application of this approach is illustrated by three case examples.

Submitted on May 27, 1975
Accepted on July 22, 1975




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