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Hypoglycemia in infants and children
1Department of Pediatrics, Mayo Clinic and Mayo Medical School, Rochester, Minnesota.
Insights
Pediatric hypoglycemia, often presenting differently than in adults, stems from unique infant metabolic balances. Causes range from hormonal issues and inborn errors of metabolism to substrate availability problems, requiring tailored diagnostic and treatment approaches.
Area of Science:
- Pediatric Endocrinology
- Metabolic Disorders
- Neonatal Medicine
Background:
- Infants and children have unique glucose production and utilization dynamics compared to adults.
- Hepatic glucose production is significantly higher in pediatric patients on a weight basis during fasting.
- Hypoglycemia in neonates and young infants presents with distinct symptoms like irritability and lethargy, differing from adult presentations.
Purpose of the Study:
- To review the unique causes and presentations of hypoglycemia in pediatric patients.
- To highlight the differences in glucose metabolism between pediatric and adult populations.
- To discuss the diagnostic and therapeutic considerations for pediatric hypoglycemia.
Main Methods:
- Literature review of pediatric hypoglycemia causes and presentations.
- Comparison of glucose metabolism in infants, children, and adults.
- Overview of diagnostic tests and treatment strategies for various hypoglycemia etiologies.
Main Results:
- Pediatric hypoglycemia can arise from hormonal imbalances, substrate interconversion issues, or fuel mobilization defects.
- Hyperinsulinemic hypoglycemia presents in neonatal, sustained, or drug-induced forms.
- Inborn errors of metabolism affecting carbohydrate, protein, and fat metabolism are significant causes.
- Ketotic hypoglycemia is linked to substrate availability abnormalities.
- Acquired or transient defects in carbohydrate metabolism can also occur.
Conclusions:
- Pediatric hypoglycemia has diverse etiologies, often distinct from adult causes, reflecting immature metabolic regulation.
- Accurate diagnosis through various tests is crucial for determining the underlying cause.
- Treatment must be individualized based on the specific etiology of hypoglycemia in each child.
Abstract:
Although the conditions that cause hypoglycemia in adults may also be present in infants and children, there are many entities unique to the pediatric age group. This reflects the delicate balance that exists in the newborn and young child between glucose production and utilization. During fasting in infants and children, hepatic glucose production is normally two to three times that of adults when expressed on the basis of weight. In the newborn and young infants, hypoglycemia usually presents with irritability, feeding difficulties, lethargy, cyanosis, tachypnea, and/or hypothermia rather than the typical adrenergic or neuroglucopenic symptoms seen in the adult. The hypoglycemia may be due to abnormalities in hormone secretion, substrate interconversion, or mobilization of metabolic fuels. The hypoglycemia associated with hyperinsulinemia may be transient neonatal, sustained, or drug-induced. Inborn errors of metabolism caused by enzymatic defects are responsible for hypoglycemia associated with abnormalities of production and utilization of metabolic fuels. These can involve carbohydrate, protein, and fat metabolism. In addition, there may be acquired or transient defects in carbohydrate metabolism secondary to other diseases or ingestion of certain substances. Finally ketotic hypoglycemia appears to be due to abnormalities in substrate availability. A variety of tests are useful for establishing the etiologic basis of the hypoglycemia, and the appropriate treatment depends upon the underlying cause.