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Glycemic Outcomes Following a Missed Premeal Bolus: A Comparative Study of Three Automated Insulin Delivery Systems
Alzbeta Santova1,2, Lukas Plachy1, Vit Neuman1
1Department of Pediatrics, Motol University Hospital and 2nd Faculty of Medicine, Prague, Czech Republic.
Insights
Automated insulin delivery (AID) systems vary in their ability to manage missed mealtime insulin. The MiniMed 780G and Control-IQ systems better controlled post-meal high blood sugar in children with type 1 diabetes compared to CamAPS.
Area of Science:
- Pediatric Endocrinology
- Diabetes Technology
- Metabolic Disorders
Background:
- Automated insulin delivery (AID) systems are crucial for managing type 1 diabetes (T1D).
- Missed premeal insulin boluses significantly impair glycemic control in T1D patients using AID.
- Understanding AID system performance during missed boluses is vital for optimizing therapy.
Purpose of the Study:
- To compare postprandial glycemic control across three leading AID systems (MiniMed 780G, Tandem Control-IQ, Ypsomed CamAPS) when premeal boluses are omitted in children with T1D.
- To evaluate the impact of missed boluses on glucose levels and identify system-specific compensatory effects.
Main Methods:
- A prospective interventional study involving 43 children with T1D using one of three AID systems.
- Participants consumed standardized 30g and 50g carbohydrate meals without premeal insulin boluses.
- Postprandial glucose levels, area under the curve (AUC), and continuous glucose monitoring metrics were analyzed over 4 hours.
Main Results:
- The MiniMed 780G system demonstrated the lowest mean glucose AUC, followed by Control-IQ, and then CamAPS (P < 0.01).
- Children using CamAPS experienced significantly more time in hyperglycemia (level 2) compared to those on Control-IQ and 780G, particularly after the 50g carbohydrate load (P < 0.001).
- The MiniMed 780G and Control-IQ systems showed superior efficacy in mitigating postprandial glucose excursions following missed boluses.
Conclusions:
- Automated insulin delivery systems exhibit distinct capabilities in compensating for omitted premeal insulin boluses.
- MiniMed 780G and Control-IQ systems offer better protection against postprandial hyperglycemia compared to CamAPS.
- These findings suggest that MiniMed 780G and Control-IQ may be more suitable for children with T1D who are prone to missing mealtime insulin doses.
Objective:
Missing premeal boluses negatively impacts glycemic outcomes in automated insulin delivery (AID) users. This prospective interventional study compared postprandial glycemia after missed bolus across three AID systems in children with type 1 diabetes (CwD).
Methods:
CwD using MiniMed 780G (780G), Tandem Control-IQ (CIQ), or Ypsomed CamAPS (CamAPS) consumed 30 g and 50 g of carbohydrates (CH) in the form of standardized enteral nutrition, purposely omitting a premeal bolus. The mean area under the curve (AUC) of glucose concentration change and continuous glucose monitoring metrics were analyzed over 4 h postprandially and compared between the systems.
Results:
Forty-three CwD completed the study (mean age = 13 years, mean HbA1c = 47 mmol/mol [6.5%]). The lowest mean AUC was reached by 780G, followed by CIQ and CamAPS (137 vs. 144 vs. 156 mmol/L·sec·103, P < 0.01). Similar trends were seen after 50 g of CH. CamAPS users spent more time in level 2 hyperglycemia (26% for 30 g, 42% for 50 g) compared to CIQ (9.9% and 26%) and 780G (5.0% and 21%; P < 0.001).
Conclusions:
AID systems differ in their capacity to compensate for missed premeal boluses. 780G and CIQ outperformed CamAPS in limiting postprandial hyperglycemia, suggesting they may be preferable for CwD prone to bolus omission.
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