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Diabetes Technol Ther. 2017 Mar;19(3):155-163. doi: 10.1089/dia.2016.0421. Epub 2017 Jan 30.

Glucose Outcomes with the In-Home Use of a Hybrid Closed-Loop Insulin Delivery System in Adolescents and Adults with Type 1 Diabetes.

Author information

1
1 Barbara Davis Center for Diabetes, University of Colorado Denver , Aurora, Colorado.
2
2 Yale University , New Haven, Connecticut.
3
3 Stanford University , Stanford, California.
4
4 Atlanta Diabetes Associates , Atlanta, Georgia .
5
5 AMCR Institute , Escondido, California.
6
6 Rainier Clinical Research Center , Renton, Washington.
7
7 Sheba Medical Center , Tel Hashomer, Israel .
8
8 University of Virginia , Charlottesville, Virginia.
9
9 International Diabetes Center , Minneapolis, Minnesota.
10
10 Medtronic , Northridge, California.

Abstract

BACKGROUND:

The safety and effectiveness of the in-home use of a hybrid closed-loop (HCL) system that automatically increases, decreases, and suspends insulin delivery in response to continuous glucose monitoring were investigated.

METHODS:

Adolescents (n = 30, ages 14-21 years) and adults (n = 94, ages 22-75 years) with type 1 diabetes participated in a multicenter (nine sites in the United States, one site in Israel) pivotal trial. The Medtronic MiniMed® 670G system was used during a 2-week run-in phase without HCL control, or Auto Mode, enabled (Manual Mode) and, thereafter, with Auto Mode enabled during a 3-month study phase. A supervised hotel stay (6 days/5 nights) that included a 24-h frequent blood sample testing with a reference measurement (i-STAT) occurred during the study phase.

RESULTS:

Adolescents (mean ± standard deviation [SD] 16.5 ± 2.29 years of age and 7.7 ± 4.15 years of diabetes) used the system for a median 75.8% (interquartile range [IQR] 68.0%-88.4%) of the time (2977 patient-days). Adults (mean ± SD 44.6 ± 12.79 years of age and 26.4 ± 12.43 years of diabetes) used the system for a median 88.0% (IQR 77.6%-92.7%) of the time (9412 patient-days). From baseline run-in to the end of study phase, adolescent and adult HbA1c levels decreased from 7.7% ± 0.8% to 7.1% ± 0.6% (P < 0.001) and from 7.3% ± 0.9% to 6.8% ± 0.6% (P < 0.001, Wilcoxon signed-rank test), respectively. The proportion of overall in-target (71-180 mg/dL) sensor glucose (SG) values increased from 60.4% ± 10.9% to 67.2% ± 8.2% (P < 0.001) in adolescents and from 68.8% ± 11.9% to 73.8% ± 8.4% (P < 0.001) in adults. During the hotel stay, the proportion of in-target i-STAT® blood glucose values was 67.4% ± 27.7% compared to SG values of 72.0% ± 11.6% for adolescents and 74.2% ± 17.5% compared to 76.9% ± 8.3% for adults. There were no severe hypoglycemic or diabetic ketoacidosis events in either cohort.

CONCLUSIONS:

HCL therapy was safe during in-home use by adolescents and adults and the study phase demonstrated increased time in target, and reductions in HbA1c, hyperglycemia and hypoglycemia, compared to baseline.

TRIAL REGISTRATION:

Clinicaltrials.gov identifier: NCT02463097.

KEYWORDS:

Continuous glucose monitoring; Hybrid closed loop; Hyperglycemia; Hypoglycemia; Insulin pump; Sensor; Type 1 diabetes

PMID:
28134564
PMCID:
PMC5359676
DOI:
10.1089/dia.2016.0421
[Indexed for MEDLINE]
Free PMC Article

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