Depression predicts all-cause mortality: epidemiological evaluation from the ACCORD HRQL substudy

Area of Science:

• Cardiology
• Psychiatry
• Endocrinology

Background:

• Depression affects 20-25% of adults with type 2 diabetes, increasing mortality risk.
• Few studies have explored depression's impact on diverse cardiovascular disease (CVD) outcomes in type 2 diabetes.

Purpose of the Study:

• To investigate the association between depression and a wide range of cardiovascular disease outcomes in adults with type 2 diabetes.
• To analyze the time-varying impact of depression on clinical outcomes within the ACCORD trial.

Main Methods:

• Utilized data from 2,053 participants in the ACCORD Health-Related Quality of Life substudy.
• Employed the Patient Health Questionnaire (PHQ)-9 to assess depression symptoms at multiple time points.
• Applied Cox proportional hazards regression models to analyze the relationship between depression and clinical outcomes, adjusting for multiple variables.

Main Results:

• Depression was not significantly linked to the primary ACCORD composite outcome (CVD death, heart attack, stroke) or the microvascular composite outcome.
• All-cause mortality showed a significant increase in individuals with probable major depression (PHQ-9 score ≥ 10).
• Probable major depression demonstrated a borderline impact on the ACCORD macrovascular endpoint.

Conclusions:

• Depression is a significant risk factor for all-cause mortality in adults with type 2 diabetes.
• Depression may also elevate the risk of macrovascular events in this patient group.
• These findings highlight the importance of addressing depression in type 2 diabetes management to mitigate cardiovascular risks.