215-OR: Performance of a Dual Hormone Closed-Loop System vs. an Insulin-Only Closed-Loop System during Challenging Inpatient Conditions: A Single-Blinded Randomized Controlled Crossover Trial

Objective: To assess the efficacy and safety of an insulin-glucagon dual-hormone (DH) compared with an insulin-only single-hormone (SH) closed-loop system. Methods: In a 33-h, randomized, crossover, inpatient study, 13 participants with type 1 diabetes used two modes of the DiaCon Artificial Pancreas system: DH and SH closed-loop control. During each study period, participants had two overnight stays, received an underbolus (50%) for their breakfast, normal bolus (100%) for lunch, overbolus (130%) for dinner and performed unannounced exercise for 45 min (bicycled at estimated 50% V02max). The co-primary endpoints were sensor-based percentage of time in hypoglycemia (