Linear growth characteristics of congenitally GH-deficient infants from birth to one year of age.

Birth length has been reported to be either normal or reduced in infants with congenital GH deficiency (CGHD). We evaluated 46 infants with CGHD followed in a single regional medical center. All were born full term and had peak GH of less than 10 microg/liter after provocative stimulation. Length SD score at birth was normal but subsequently showed deceleration, at 6 months and 12 months of age, before GH treatment. The majority were delivered vaginally (83%), and delivery was uncomplicated in 61%. Four patients (9%) had breech vaginal delivery. Perinatal morbidities were found in 72% of infants and included jaundice (n = 17), hypoglycemia with or without seizure (n = 14), and hypoxemia (n = 5). Multiple pituitary hormone deficiencies were found in 85% of the subjects. Organic lesions were documented in all 22 subjects who had magnetic resonance imaging and in 4 of 11 subjects who had computed tomography scan. Only the hypoglycemic infants received early GH treatment. Growth data in hypoglycemic and normoglycemic CGHD infants were not significantly different. In our population, CGHD did not adversely affect fetal growth but is essential for normal linear growth during early infancy. Congenital developmental abnormalities in the hypothalamic-pituitary region are the most common cause of CGHD and are best diagnosed by an magnetic resonance imaging study.