Mild Depression Predicts Long-Term Mortality After Acute Myocardial Infarction: A 25-Year Follow-Up

Area of Science:

• Cardiology
• Psychiatry
• Public Health

Background:

• Depression is a known independent predictor of mortality following acute myocardial infarction (AMI).
• Previous research indicates a link between depression and adverse outcomes in AMI patients.
• The long-term persistence of this risk, especially for milder depression, requires further investigation.

Purpose of the Study:

• To investigate the long-term impact of depression, including mild forms, on mortality in patients after acute myocardial infarction (AMI).
• To determine if the adverse effect of depression on mortality persists for up to 25 years post-AMI.

Main Methods:

• A historical cohort study design was employed, analyzing patients admitted for transmural AMI in the 1980s.
• The Beck Depression Inventory (BDI) was used to assess depression levels (low, mild, moderate to severe) in 188 patients.
• Cox proportional-hazards modeling analyzed the relationship between BDI scores and all-cause mortality over 25 years, using the Australian National Death Index.

Main Results:

• Depression independently predicted mortality at 5, 10, and 15 years post-AMI, but not at 20 or 25 years.
• Patients with mild depression exhibited higher mortality rates compared to those with low or moderate to severe depression.
• The study included 188 patients, with depression status assessed three weeks after hospital admission.

Conclusions:

• Early identification and management of depression, including mild cases, are crucial for AMI survivors.
• Patients with depression post-AMI remain at an elevated risk of mortality for an extended period.
• Ongoing monitoring and appropriate treatment are recommended for these patients to mitigate long-term risks.