Two or three insulin injections in adolescence?

Area of Science:

• Pediatrics
• Endocrinology
• Metabolic Disorders

Background:

• Morning hyperglycemia is a persistent challenge for adolescents with type 1 diabetes on conventional insulin therapy.
• Optimizing insulin timing is crucial for managing blood glucose fluctuations in this population.

Purpose of the Study:

• To evaluate the impact of delaying evening intermediate-acting insulin administration to bedtime on glycemic control in adolescents with type 1 diabetes.
• To compare a three-injection regimen (delayed evening insulin) with conventional regimens.

Main Methods:

• A one-year crossover study involving 18 adolescents with type 1 diabetes.
• Participants were switched between a conventional insulin regimen and a regimen with delayed evening intermediate-acting insulin (given at bedtime instead of before the evening meal).
• Glycosylated hemoglobin (HbA1c) concentrations and blood glucose levels were monitored.

Main Results:

• The delayed insulin regimen resulted in slightly higher early nighttime blood glucose but lower morning concentrations, with no significant change in overall HbA1c.
• Seasonal variations accounted for a larger proportion of the variance in HbA1c than the insulin regimen change.
• The frequency of hypoglycemic episodes remained unchanged between the two regimens.

Conclusions:

• Adjusting the timing of evening intermediate-acting insulin to bedtime does not significantly improve glycemic control (HbA1c) in adolescents with type 1 diabetes.
• Seasonal variations play a more substantial role in glycemic control variability than changes in conventional insulin regimens.
• Intensified monitoring and medical attention may be necessary to further improve metabolic control in this patient group.