Faster Compared with Standard Insulin Aspart during Day-And-Night Fully Closed-Loop Insulin Therapy in Type 1 Diabetes: A Double-Blind Randomized Crossover Trial

OBJECTIVE We evaluated the safety and efficacy of day-And-night fully closed-loop insulin therapy using faster (Faster-CL) compared with standard insulin aspart (Standard-CL) in young adults with type 1 diabetes. RESEARCH DESIGN AND METHODS In a double-blind, randomized, crossover trial, 20 participants with type 1 diabetes on insulin pump therapy (11 females, aged 21.3 6 2.3 years, HbA1c 7.5 6 0.5% [58.5 6 5.5 mmol/mol]) underwent two 27-h inpatient periods with unannounced afternoon moderate-vigorous exercise and unannounced/uncovered meals. We compared Faster-CL and Standard-CL in random order. During both interventions, the fuzzy-logic control algorithm DreaMed GlucoSitter was used. Glucose sensor data were analyzed by intention-To-Treat principle with the difference (between Faster-CL and Standard-CL) in proportion of time in range 70 180 mg/dL (TIR) over 27 h as the primary end point. RESULTS The proportion of TIR was similar for both arms: 53.3% (83% overnight) in Faster-CL and 57.9% (88% overnight) in Standard-CL (P 5 0.170). The proportion of time in hypoglycemia <70 mg/dL was 0.0% for both groups. Baseline-Adjusted interstitial prandial glucose increments 1 h after meals were greater in Faster-CL compared with Standard-CL (P 5 0.017). The gaps between measured plasma insulin and estimated insulin-on-board levels at the beginning, at the end, and 2 h after the exercise were smaller in the Standard-CL group (P50.029, P50.003, and P50.004, respectively). No severe adverse events occurred. CONCLUSIONS Fully closed-loop insulin delivery using either faster or standard insulin aspart was safe and efficient in achieving near-normal glucose concentrations outside postprandial periods. The closed-loop algorithm was better adjusted to the standard insulin aspart.