Objectives: Flash glucose monitoring in patients with type 1 diabetes provides new glucometric data that allow for the assessment of glycemic control beyond HbA. The objective of the study was to evaluate the relationship between HbA, time-in-range (TIR) and glycemic variability in a cohort of paediatric and adult patients with type 1 diabetes and treatment with flash glucose monitoring.
Material And Methods: This was a cross-sectional study in 195 patients with type 1 diabetes (42.6% females, 70 paediatric, 26.2% continuous subcutaneous insulin infusion, 28.7% coefficient of variation [CV]≤36%) in intensive treatment and flash glucose monitoring. Clinical, analytical and glucometric data were evaluated.
Results: The relationship between the TIR and HbA showed a strong negative linear correlation (R=-0.746; R=0.557; P<.001), modified in those patients with CV≤36% (R=-0.852; R=0.836) compared to CV>36% (R=-0.703; R=0.551). A similar correlation was found when evaluating the TIR and the Glucose Management Indicator (R=-0.846; R=0.715; P<.001); in patients with CV≤36% (R=-0.980; R=0.960) versus CV>36% (R=-0.837; R=0.701); P<.001. Both correlations remained stable in the paediatric population (R=-0.724; R=0.525; P<.001) and adults (R=-0.706; R=0.498; P<.001) and by type of treatment: multiple doses of insulin (R=-0.747; R=0.558; P<.001) and continuous subcutaneous insulin infusion (R=-0.711; R=0.506; P<.001). In a multiple regression analysis evaluating HbA as dependent variable, the only parameters that maintained statistical significance were the TIR (β=-0,031; P<.001), CV (β=0.843; P<.05) and TIR-CV interaction (β=-0.017; P<.01).
Conclusions: The glycemic variability defined by the CV modifies the relationship between the TIR and HbA/Glucose Management Indicator and should be taken into account when individualising TIR targets, regardless of age or the type of treatment used.
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