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Attenuated response to insulin in very low birthweight infants
Insights
Very low birthweight infants with hyperglycemia may experience insulin resistance, not deficiency, impacting glucose tolerance. High insulin doses did not resolve hyperglycemia, suggesting resistance as a key factor.
Area of Science:
- Neonatal Medicine
- Endocrinology
- Metabolic Disorders
Background:
- Hyperglycemia is a concern in very low birthweight (VLBW) infants.
- Impaired glucose tolerance can complicate neonatal care.
Purpose of the Study:
- To investigate the efficacy of continuous insulin infusion for improving glucose tolerance in VLBW infants with hyperglycemia.
- To explore the underlying mechanisms of glucose intolerance in this population.
Main Methods:
- Four VLBW infants with hyperglycemia received constant insulin infusion alongside parenteral alimentation.
- Insulin dosage was escalated up to 16 units/kg/hour.
- Serum glucose and insulin levels were monitored.
Main Results:
- An initial 45% decrease in serum glucose was observed.
- Glucose intolerance recurred within hours to days despite escalating insulin infusion.
- Serum insulin levels reached as high as 72,000 microU/ml.
Conclusions:
- Insulin resistance, rather than insulin deficiency, is likely responsible for glucose intolerance in some VLBW infants.
- Standard insulin therapy may be insufficient in cases of severe insulin resistance.
Abstract:
Four hyperglycemia very low birthweight (VLBW) infants were given a constant infusion of insulin with parenteral alimentation in order to improve glucose tolerance. After an initial 45% decrease in serum glucose, intolerance recurred within hours to days despite delivery of as much as 16 units/kg/hour or regular insulin. Resulting serum insulin levels were as high as 72,000 microU/ml. It is suggested that insulin "resistance", instead of insulin deficiency, may be responsible for glucose intolerance in some infants.