May 1, 2024
Article

Exploring the Relationship Between Glycemic Control and Mortality in Elderly Cognitive Patients

Managing type 2 diabetes effectively involves monitoring glycated hemoglobin (HbA1c) levels, which reflect average blood sugar concentrations over several months. This study focused on older adults with cognitive impairments, assessing the risks associated with HbA1c levels that are either above, below, or within the recommended target ranges. Interestingly, the research reveals that maintaining HbA1c levels within these targets significantly correlates with lower mortality risks compared to levels outside this range. These findings underscore the importance of precise glycemic control, particularly in aging populations at memory clinics, to enhance longevity and overall health.

The researchers utilized retrospective data from a cohort of elderly patients, both diabetic and non-diabetic, who attended a memory clinic. By categorizing diabetic patients according to their HbA1c results—either within, above, or below the target range—they could investigate the impact on survival rates. This approach highlighted a critical insight: those within the target range exhibited no increased risk of death compared to their non-diabetic peers, suggesting that well-managed blood sugar levels are crucial for this vulnerable group.

This study's implications are vital for clinical practices, especially in geriatric care settings where cognitive impairment and diabetes management are common concerns. It provides a strong case for rigorous monitoring and management of diabetes to mitigate associated risks and improve the quality of life for older adults. By adopting such targeted strategies, healthcare providers can better support the health and wellbeing of their patients with cognitive challenges.

Article Information

Abstract

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.