Key Findings
Short-lived hyperglycaemia (SLH)—defined as isolated hyperglycaemic episodes lasting 10–60 minutes—significantly impacts continuous glucose monitoring (CGM) metrics in children and adolescents with type 1 diabetes (T1D). In a cohort of 135 participants, 2,874 out of 15,556 hyperglycaemic episodes (18.5%) were classified as daytime SLH, with a median of 19.0 episodes per participant. The removal of SLH from data increased daytime TIR by 1.74 percentage points (95% CI 1.59–1.89) and reduced daytime median glucose by 0.18 mmol/L (95% CI 0.17–0.20).
Technical Details
The retrospective cohort study included patients aged 6 months–20 years with 5-minute CGM data, ≥70% coverage, and median glucose between 6.1–9.4 mmol/L over a 45-day window. Researchers estimated the contribution of SLH by replacing these episodes with plausible trajectories. While whole-day effects were modest, the local impact was more pronounced; at maximal divergence, glucose profiles differed by 1.30 mmol/L (95% CI 1.21–1.38), specifically around meals. The study found that SLH frequency was higher in younger children, those with shorter diabetes duration, and those with better overall glycaemic control (lower GTAA1c).
Background & Context
Current CGM metrics, such as median glucose and TIR, guide therapeutic decisions but fail to distinguish between sustained and transient hyperglycaemia. This lack of distinction means that patients with nearly identical conventional metrics can exhibit markedly different SLH frequencies, a temporal pattern that remains invisible when using summary metrics alone.
Significance & Outlook
The prevalence of SLH suggests that recurrent brief episodes can inflate the metrics used for insulin titration. The authors conclude that clinicians should verify if hyperglycaemia is brief and isolated before intensifying insulin, as behavioural or educational interventions may be more appropriate. Future directions include integrating automated SLH detection into CGM reports and conducting prospective tests to determine if targeting SLH reduces overtreatment.
Source: https://doi.org/10.64898/2026.10.28.26365991
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