Blood-sugar control and severe COVID-19 were linked in cohort studies
A review associated poor glucose control and glucose fluctuations with worse illness outcomes, without establishing that either caused them.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
The review linked poor blood-sugar control with more severe illness, intensive care admission and mechanical ventilation. Glucose fluctuations were also associated with worse outcomes. Because the underlying studies were observational, these results describe risk markers; they do not show that treating high or unstable blood sugar improves outcomes in this patient population.
Blood-sugar definitions differed across studies, and the abstract does not provide follow-up lengths or precise reference-group thresholds. Only a subset of cohorts contributed to pooled estimates, limiting what this abstract-based summary can establish.
Control and variability were separate questions
The review distinguished high blood sugar from fluctuations in glucose. Measures included longer-term glucose control, fasting glucose and levels recorded during illness. These different definitions matter when interpreting which patients were classified as having poor control.
A mortality marker needs cautious interpretation
Greater glucose variability remained associated with mortality in adjusted analyses of hospitalized patients. Only a small set of studies assessed variability, so the apparent consistency of their results does not establish a reliable treatment target.
The original publication
Association of Chronic Hyperglycemia and Glycemic Variability with Mortality in COVID-19: Meta-Analysis of Cohort Studies.
Pah AM, Gavrilescu DM, Mateescu DM et al.
Medicina (Kaunas) · 2026
- PubMed ID
- 41752709
- Record checked
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