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In infants of diabetic mothers, maternal-fetal hyperglycemia induces fetal hyperinsulinemia, which may be sustained for several hours after birth. The inhibitory effect of insulin on glycogenolysis, gluconeogenesis, and lipolysis increases the risk of hypoglycemia in these infants. Eight term infants of diabetic mothers were studied between 3.9 and 8.5 h postnatally. The maternal diabetes was considered well controlled as judged by self-monitoring of blood glucose and Hb Alc. Neonatal plasma concentrations of glucose, glycerol, and insulin were monitored and averaged 2.7 +/- 0.7 mM, 371 +/- 116 microM, and 15.9 +/- 2.8 microU.mL-1, respectively. Stable isotope-gas chromatography/ mass spectrometry techniques were used to determine glucose and glycerol turnover rates and gluconeogenesis from glycerol in the infants. The appearance rates of glucose and glycerol averaged 20.0 +/- 5.4 mumol.kg-1.min-1 (3.6 +/- 1.0 mg.kg-1.min-1), and 8.9 +/- 2.3 mumol.kg-1.min-1, respectively. The fraction of glycerol appearance rate converted to glucose was 68.2 +/- 17.3%, which accounted for 15.5 +/- 4.6% of glucose production. Thus, compared with healthy term infants studied previously under identical conditions, the infants of diabetic mothers had higher insulin concentrations and attenuated glucose production. Despite increased insulin concentrations, lipolysis was unimpaired, and the gluconeogenic contribution from glycerol was higher than in the healthy newborns.

Attenuated Hepatic Glucose Production but Unimpaired Lipolysis in Newborn Infants of Mothers with Diabetes