Aim: To assess the ability of fully closed-loop insulin delivery to accommodate day-to-day variability in insulin requirements in noncritical care setting.

Methods: We retrospectively analyzed insulin delivery during closed-loop studies in inpatients with hyperglycaemia requiring insulin on general wards (type 1 diabetes excluded). Coefficient of variation (CV) quantified day-to-day variability of insulin requirements over 5 to 15 days of closed-loop use. Participants were stratified into tertiles according to variability of insulin requirements.

Results: Data from 487 days (55 participants) were analyzed. Participants with higher CV of insulin requirements had comparable mean glucose (149 vs. 153mg/dL; P=0.59; Table) and time in target glucose 100-180mg/dL (67.8 vs. 67.9%; P=0.99) to those with lower CV. There was no increase in hypoglycemia in those with higher CV (P=0.67). Those with higher CV were younger than those with lower CV (66 vs. 72years; P=0.037). Weight, gender, HbA1c, diabetes/insulin duration, use of steroids/dialysis/nutrition support were comparable (ns).

Conclusions: Fully closed-loop insulin delivery can accommodate highly variable insulin requirements without compromising glucose control or increasing the risk of hypoglycaemia in inpatients receiving insulin therapy on general wards.

C.K. Boughton: None. L. Bally: None. H. Thabit: Research Support; Self; Dexcom, Inc. S. Hartnell: Advisory Panel; Self; Dexcom, Inc., JDRF. Speaker's Bureau; Self; Sanofi. D. Herzig: None. A. Vogt: None. E. Andereggen: None. Y. Ruan: None. M.E. Wilinska: None. M. Evans: Advisory Panel; Self; Dexcom, Inc., Medtronic, Roche Diabetes Care, Zucara Therapeutics Inc. Research Support; Self; MedImmune, Sanofi. Speaker's Bureau; Self; AstraZeneca. Other Relationship; Self; Abbott, Eli Lilly and Company, Novo Nordisk Inc. M.M. Wertli: None. A.P. Coll: None. C. Stettler: None. R. Hovorka: Advisory Panel; Self; Novo Nordisk A/S. Research Support; Self; Abbott, Dexcom, Inc., Medtronic. Speaker's Bureau; Self; Eli Lilly and Company, Novo Nordisk A/S. Other Relationship; Self; B. Braun Medical Inc., Medtronic.

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