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Neonatal Hyperglycemia

By

Kevin C. Dysart

, MD, Perelman School of Medicine at the University of Pennsylvania

Last full review/revision Mar 2021| Content last modified Mar 2021
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Hyperglycemia is a serum glucose concentration > 150 mg/dL (> 8.3 mmol/L). Diagnosis is with serum glucose testing. Treatment is reduction of the IV dextrose concentration or of the infusion rate, or IV insulin.

The most common cause of neonatal hyperglycemia is

  • Iatrogenic

Iatrogenic causes usually involve too-rapid IV infusions of dextrose during the first few days of life in very low-birth-weight infants (< 1.5 kg).

The other important cause is physiologic stress caused by surgery, hypoxia, respiratory distress syndrome Respiratory Distress Syndrome in Neonates Respiratory distress syndrome is caused by pulmonary surfactant deficiency in the lungs of neonates, most commonly in those born at 37 weeks gestation. Risk increases with degree of prematurity... read more , or sepsis Neonatal Sepsis Neonatal sepsis is invasive infection, usually bacterial, occurring during the neonatal period. Signs are multiple, nonspecific, and include diminished spontaneous activity, less vigorous sucking... read more ; fungal sepsis poses a special risk. In premature infants, partially defective processing of proinsulin to insulin and relative insulin resistance may cause hyperglycemia. In addition, transient neonatal diabetes mellitus is a rare self-limited cause that usually occurs in small-for-gestational-age infants Small-for-Gestational-Age (SGA) Infant Infants whose weight is the 10th percentile for gestational age are classified as small for gestational age. Complications include perinatal asphyxia, meconium aspiration, polycythemia, and... read more ; corticosteroid therapy may also result in transient hyperglycemia. Hyperglycemia is less common than hypoglycemia, but it is important because it increases morbidity and mortality of the underlying causes.

Symptoms and Signs of Neonatal Hyperglycemia

Symptoms and signs of neonatal hyperglycemia are those of the underlying disorder.

Diagnosis of Neonatal Hyperglycemia

  • Serum glucose testing

Diagnosis of neonatal hyperglycemia is by serum glucose testing. Additional laboratory findings may include glycosuria and marked serum hyperosmolarity.

Treatment of Neonatal Hyperglycemia

  • Reduction of IV dextrose concentration, rate, or both

  • Sometimes IV insulin

Treatment of iatrogenic hyperglycemia is reduction of the IV dextrose concentration (eg, from 10% to 5%) or of the infusion rate; hyperglycemia persisting at low dextrose infusion rates (eg, 4 mg/kg/minute) may indicate relative insulin deficiency or insulin resistance.

Treatment of other causes is fast-acting insulin. One approach is to add fast-acting insulin to an IV infusion of 10% dextrose at a uniform rate of 0.01 to 0.1 unit/kg/hour, then titrate the rate until the glucose level is normalized. Another approach is to add insulin to a separate IV of 10% D/W given simultaneously with the maintenance IV infusion so that the insulin can be adjusted without changing the total infusion rate. Responses to insulin are unpredictable, and it is extremely important to monitor serum glucose levels and to titrate the insulin infusion rate carefully.

In transient neonatal diabetes mellitus, glucose levels and hydration should be carefully maintained until hyperglycemia resolves spontaneously, usually within a few weeks.

Any fluid or electrolytes lost through osmotic diuresis should be replaced.

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