
Managing type 2 diabetes and keeping blood sugar levels within recommended limits is crucial, especially for older adults with cognitive challenges. Recent research delves into how glycated hemoglobin (HbA1c) levels, a marker of long-term blood sugar control, affect the mortality rates of the elderly with cognitive impairments. Those with HbA1c levels either too high or too low faced increased mortality risks, underscoring the importance of precise diabetes management. Interestingly, maintaining HbA1c within targeted ranges neutralized the risk, aligning mortality rates with those without diabetes. This insight emphasizes not just the significance of diabetes management but also its nuanced balance for cognitive health in aging populations. The study highlights the delicate interplay between blood sugar control and overall longevity, offering a beacon for tailored healthcare strategies in older adults.
Article Information
Published in Diabetes Care.Taiki Sugimoto et al.
Objective: To determine the impact of type 2 diabetes and glycated hemoglobin (HbA1c) levels within the recommended target range according to the Japan Diabetes Society/Japan Geriatrics Society Joint Committee on mortality in older adults with cognitive impairment.
Research design and methods: This retrospective cohort study included 1,528 and 468 patients aged ≥65 years without and with type 2 diabetes, respectively, who were visiting a memory clinic. The 468 patients with type 2 diabetes were divided into three groups (within, above, and below the target range) based on their HbA1c levels, cognitive function, ability to perform activities of daily living, and medications associated with a high risk of hypoglycemia. The impact of diabetes and HbA1c levels on mortality was evaluated using Cox proportional hazards models.
Results: Over a median follow-up period of 3.8 years, 353 patients (17.7%) died. Compared with individuals without type 2 diabetes, HbA1c levels above (hazard ratio [HR] 1.70, 95% CI 1.08-2.69) and below (HR 2.15, 95% CI 1.33-3.48) the target range were associated with a higher risk of death; however, HbA1c levels within the target range were not (HR 1.02, 95% CI 0.77-1.36).
Conclusions: HbA1c levels above and below the target range were associated with a higher risk of mortality, whereas patients with HbA1c levels within the target range did not exhibit a higher risk of mortality than individuals without type 2 diabetes. These results provide empirical support for the current target ranges among older adults with cognitive impairment.