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Six-Month Randomized, Multicenter Trial of Closed-Loop Control in Type 1 Diabetes

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Brown, Sue A., Kovatchev, Boris P., Raghinaru, Dan, Lum, John W., Buckingham, Bruce A., Kudva, Yogish C., Laffel, Lori M., Levy, Carol J. +13 more·2019·New England Journal of Medicine

Abstract

BACKGROUND: Closed-loop systems that automate insulin delivery may improve glycemic outcomes in patients with type 1 diabetes. METHODS: In this 6-month randomized, multicenter trial, patients with type 1 diabetes were assigned in a 2:1 ratio to receive treatment with a closed-loop system (closed-loop group) or a sensor-augmented pump (control group). The primary outcome was the percentage of time that the blood glucose level was within the target range of 70 to 180 mg per deciliter (3.9 to 10.0 mmol per liter), as measured by continuous glucose monitoring. RESULTS: A total of 168 patients underwent randomization; 112 were assigned to the closed-loop group, and 56 were assigned to the control group. The age range of the patients was 14 to 71 years, and the glycated hemoglobin level ranged from 5.4 to 10.6%. All 168 patients completed the trial. The mean (±SD) percentage of time that the glucose level was within the target range increased in the closed-loop group from 61±17% at baseline to 71±12% during the 6 months and remained unchanged at 59±14% in the control group (mean adjusted difference, 11 percentage points; 95% confidence interval [CI], 9 to 14; P<0.001). The results with regard to the main secondary outcomes (percentage of time that the glucose level was >180 mg per deciliter, mean glucose level, glycated hemoglobin level, and percentage of time that the glucose level was <70 mg per deciliter or <54 mg per deciliter [3.0 mmol per liter]) all met the prespecified hierarchical criterion for significance, favoring the closed-loop system. The mean difference (closed loop minus control) in the percentage of time that the blood glucose level was lower than 70 mg per deciliter was -0.88 percentage points (95% CI, -1.19 to -0.57; P<0.001). The mean adjusted difference in glycated hemoglobin level after 6 months was -0.33 percentage points (95% CI, -0.53 to -0.13; P = 0.001). In the closed-loop group, the median percentage of time that the system was in closed-loop mode was 90% over 6 months. No serious hypoglycemic events occurred in either group; one episode of diabetic ketoacidosis occurred in the closed-loop group. CONCLUSIONS: In this 6-month trial involving patients with type 1 diabetes, the use of a closed-loop system was associated with a greater percentage of time spent in a target glycemic range than the use of a sensor-augmented insulin pump. (Funded by the National Institute of Diabetes and Digestive and Kidney Diseases; iDCL ClinicalTrials.gov number, NCT03563313.).

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Crossref · 10.1056/nejmoa1907863

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  • The largest trial of liraglutide in type 1 diabetes showed a 0.4% A1C reduction with the 1.8 mg dose, along with 5 kg weight loss and insulin dose reductions.

    “The largest trial with this class in T1D was with liraglutide, which showed a reduction of A1C of 0.4% with the highest 1.8 mg dose in addition to a 5 kg weight loss and insulin dose reductions.1177”

    From American Association of Clinical Endocrinology Clinical Practice Guideline: Developing a Diabetes Mellitus Comprehensive Care Plan-2022 Update. (2022) · cites this paper as [1177]

    The Methods (p. 1) describe a trial of a closed-loop insulin-delivery system versus a sensor-augmented pump, not liraglutide. The Results (p. 1) report an adjusted A1C difference of −0.33 percentage points, while the results on p. 6 report no significant difference in weight change or daily insulin amount between groups. These findings contradict the outcomes attributed to this paper. (LLM, conf=0.90)

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  • The introduction of continuous glucose monitoring devices that alarm with low blood glucose concentrations and semiautomated pumps that suspend insulin infusion as glucose concentrations decrease have facilitated achieving target HbA1c levels with less risk for hypoglycemia.

    “Moreover, the introduction of CGM devices that alarm with low blood glucose concentrations and semiautomated pumps that suspend insulin infusion as glucose concentrations decrease have facilitated achieving target HbA 1c levels with less risk for hypoglycemia (332).”

    From Guidelines and Recommendations for Laboratory Analysis in the Diagnosis and Management of Diabetes Mellitus (2023) · cites this paper as [332]

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  • Hybrid closed-loop systems are the most effective means of maintaining glucose in the normal range in people with type 1 diabetes.

    “Hybrid closedloop systems are the most effective means of maintaining glucose in the normal range in people with type 1 diabetes (90,91).”

    From The management of type 1 diabetes in adults. A consensus report by the American Diabetes Association (ADA) and the European Association for the Study of Diabetes (EASD) (2021) · cites this paper as [91]

    The Results (p. 1) show that the closed-loop group spent more time in the target glucose range than the sensor-augmented pump group. But the trial compared one closed-loop system with one alternative; it does not establish that hybrid closed-loop systems are the most effective means among all options. (LLM, conf=0.88)

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  • The use of insulin analog regimens are associated with less hypoglycemia, while hybrid closed-loop systems result in both improvement in TIR and reduction in TBR.

    “The use of insulin analog regimens are associated with less hypoglycemia, while hybrid closed-loop systems result in both improvement in TIR and reduction in TBR (91).”

    From The management of type 1 diabetes in adults. A consensus report by the American Diabetes Association (ADA) and the European Association for the Study of Diabetes (EASD) (2021) · cites this paper as [91]

    The Discussion (p. 9) reports more time in the target range and less hypoglycemia with the closed-loop system than with a sensor-augmented pump, supporting the TIR and TBR portion of the claim. The paper does not report that insulin analog regimens are associated with less hypoglycemia; that portion is unsupported. (LLM, conf=0.90)

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  • The NEJM publications reported pivotal trials of the commercial descendant of DiAs, Control-IQ by Tandem Diabetes Care, in age groups 14 years old and older, 6 to 13 years old, and 2 to 6 years old.

    “These prestigious publications reported pivotal trials of the commercial descendant of DiAs-a new AID system (Control-IQ by Tandem Diabetes Care)-in different age groups: 14 years old and older, 132 6 to 13 years old, 133 and 2 to 6 years old.134”

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  1. [8]8. trol in patients with type 1 diabetes: a systematic review and meta-analysis of outpatient randomised controlled trials. Lancet Diabetes Endocrinol 2017; 5: 501-12.

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Authors
Brown, S. A., Kovatchev, B. P., Raghinaru, D., Lum, J. W., Buckingham, B. A., Kudva, Y. C., Laffel, L. M., Levy, C. J., Pinsker, J. E., Wadwa, R. P., Dassau, E., Doyle, F. J., Anderson, S. M., Church, M. M., Dadlani, V., Ekhlaspour, L., Forlenza, G. P., Isganaitis, E., Lam, D. W., Kollman, C., & Beck, R. W.
Affiliations
  • Sansum Diabetes Research Institute (US)
  • Mayo Clinic (US)
  • Joslin Diabetes Center (US)
  • Harvard University (US)
Venue
New England Journal of Medicine
Published
2019-10-31
Volume
381
Issue
18
Pages
1707-1717
ISSN
  • 0028-4793 (ISSN-L)
  • 1533-4406
OpenAlex
W2981310284
Cited by
1,030
References
17
Citations by year
2026: 128 · 2025: 134 · 2024: 140 · 2023: 180 · 2022: 158 · 2021: 156 · 2020: 125 · 2019: 8
FWCI
90.66
Type
journal article
Language
en
Open access
Locations
  • New England Journal of Medicine (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • HAL (submittedVersion)
Funders
National Institute of Diabetes and Digestive and Kidney Diseases (UC4 DK108483)
Topics
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Management and Research
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Management and Education
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Treatment and Management
Keywords
type 1 diabetes, artificial pancreas, sensor-augmented pump, continuous glucose monitoring, glycemic control, HbA1c, hypoglycemia, hyperglycemia, insulin pump therapy, glycemic variability, HbA1c reduction, hypoglycemia risk reduction, HbA1c thresholds, hypoglycemia risk
MeSH terms
Adolescent, Adult, Aged, Blood Glucose, Diabetes Mellitus, Type 1, Equipment Design, Female, Glycated Hemoglobin, Humans, Hypoglycemic Agents, Insulin, Insulin Infusion Systems, Male, Middle Aged, Pancreas, Artificial, Young Adult

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