Michael Alan Wood
CHICAGO — Children aged 7 to 13 years with type 1 diabetes who used an artificial pancreas system for 3 months experienced a reduction in HbA1c and an improvement in time to glucose values in the target range, without any episodes of severe hypoglycemia or diabetic ketoacidosis, according to study data presented here.
“Diabetes management, especially with children, is a challenge,” Michael Alan Wood, MD, associate professor of pediatrics and clinical director of the pediatric diabetes program at the University of Michigan Medical School in Ann Arbor, said during a press conference at the Endocrine Society Annual Meeting. “The MiniMed 670G system may provide means to address and improve glycemic control in some patients living with type 1 diabetes.”
The MiniMed 670G system (Medtronic), the first hybrid closed-loop system for type 1 diabetes, was approved by the FDA in October 2016 and launched in the United States in June 2017. The system features Medtronic’s SmartGuard HCL technology and Guardian Sensor 3, the only FDA-approved insulin pump that enables personalized and automated delivery of basal insulin. Blood glucose is also monitored using the Contour Next Link 2.4 blood glucose monitoring system (Ascensia Diabetes Care). The MiniMed system is not FDA approved for children aged 14 years or younger.
In a single-arm study, Wood and colleagues analyzed data from 105 children aged 7 to 13 years with type 1 diabetes (mean age, 11 years; 49 girls; mean BMI, 19.1 kg/m²; mean diabetes duration, 5.6 years; mean baseline HbA1c, 7.9%). All participants were using insulin pump therapy for at least 5 months at eight U.S. sites and one site in Israel. Following an in-clinic evaluation, children used the MiniMed system in open-loop, manual mode for 2 weeks, followed by closed-loop, automatic mode for 3 months. Study endpoints were change in HbA1c from baseline to 3 months and reports of severe hypoglycemia and DKA. Additionally, researchers compared data for the cohort with data from similar trials involving 30 adolescents aged 14 to 21 years and 94 adults aged 22 to 75 years.
From baseline to 3 months, HbA1c improved from a mean of 7.9% to 7.5%, Wood said, as did overall variability of sensor glucose values. Total daily dose of insulin increased slightly, from a mean of 0.8 units per day to 0.9 units per day.
Wood noted the researchers were most excited by the marked improvement in time spent in the target blood glucose range of 71 mg/dL to 180 mg/dL, which increased from 56% to 65% in the pediatric group over 3 months of use. The results were comparable to those observed in the adolescent and adult groups, in whom time-in-range improved from 60% to 67% and 68% to 78.3%, respectively, over 3 months of artificial pancreas use.
No adverse events were reported, Wood said.
“Of the more than 12,000 patient days of system use by the adolescent and adult groups, and the more than 15,000 patient days of patient use by the 7-to-13-year-olds, there were no severe hypoglycemic events and no diabetic ketoacidosis events, which is, really, an exceptional safety record,” Wood said. “The data showed that, compared to baseline, 3-month use of this system in all three age groups improved the average glucose value, reduced day and night variability, improved time-in-target range and reduced hypoglycemia.”
All except three children continued to use the system after the study via the Continued Access Program, Wood said. – by Regina Schaffer
Wood MA. SAT-179. Presented at: The Endocrine Society Annual Meeting; March 17-20, 2018; Chicago.
Disclosure: The study was funded by Medtronic. Wood reports he is a research investigator for Medtronic Diabetes.