Insulin Bolus Patterns in Newly Diagnosed Youth With Type 1 Diabetes Using a Hybrid Closed-Loop Insulin Delivery...

Area of Science:

• Endocrinology
• Metabolic Diseases
• Pediatric Diabetes Management

Background:

• Investigating the evolution of insulin delivery patterns in pediatric type 1 diabetes (T1D) is crucial for optimizing treatment.
• Hybrid closed-loop systems (HCL) represent a significant advancement in T1D management for youth.
• Understanding long-term bolus delivery trends in HCL users is essential for refining therapeutic strategies.

Purpose of the Study:

• To analyze the changes in total daily insulin delivered as boluses over a 48-month period in newly diagnosed youth with T1D using an HCL system.
• To assess trends in carbohydrate intake, bolus frequency, and insulin dosing relative to carbohydrate intake.
• To evaluate the impact of these changes on postprandial glucose excursions.

Main Methods:

• Secondary analysis of data from the CLOuD study, a 48-month, open-label, multicenter, randomized trial.
• Inclusion of newly diagnosed youth with T1D using a hybrid closed-loop insulin delivery system.
• Examination of insulin bolus patterns, carbohydrate entries, and glucose metrics over the trial duration.

Main Results:

• The proportion of total daily insulin delivered as carbohydrate-related boluses decreased from 58% to 34% over 48 months.
• A trend towards decreased carbohydrate intake and bolus frequency was observed, alongside an increase in bolus insulin per 10g carbohydrate.
• Postprandial glucose excursions showed a slight increase, despite adjustments in insulin delivery.

Conclusions:

• The observed decline in bolus insulin proportion may indicate missed or insufficient boluses by users.
• The hybrid closed-loop system appears to compensate for inadequate bolus delivery by increasing basal insulin.
• Further research is needed to optimize user education and system algorithms to ensure appropriate bolus delivery and glycemic control.