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Background: We investigated whether in young children with inadequately controlled type 1 diabetes and technical problems with continuous subcutaneous infusion of insulin at 100 units/mL the switch to insulin diluted to 10 units/mL (U10) can limit technical problems and improve glycemic control. Subjects and Methods: Diluted U10 insulin was started in three children 3.8, 3.2, and 1.3 years old with a hemoglobin A1c (HbA1c) level (mean±SD) of 8.1±0.17% (65±1.7 mmol/mol) and insulin dose of 8.80±2.93 units/day. Patients were evaluated with continuous glucose monitoring (iPro™2; Medtronic Minimed, Northridge, CA) and a quality of life questionnaire (PedsQL™; ) and surveyed for pump-related problems at baseline and after 3 and 9 months of U10 insulin therapy. Results: Continuous glucose monitoring records showed that glycemic variability assessed by SD and M100 decreased significantly ( P=0.0085 and P=0.0482, respectively). HbA1c levels dropped to 7.3±1.00% (56±11.0 mmol/mol) after 3 months and to 6.7±0.55% (50±6.1 mmol/mol) after 9 months ( P=0.12). Technical difficulties were minimized. Conclusions: These results suggest that the use of U10 insulin decreases glycemic variability and improves hampered pump therapy in young children with inadequately controlled type 1 diabetes. [ABSTRACT FROM AUTHOR]