[Prognosis after late versus early nonfatal myocardial infarction]

Area of Science:

• Cardiology
• Clinical Medicine
• Public Health

Background:

• Nonfatal recurrent myocardial infarction (RNMI) is a significant predictor of patient outcomes.
• Existing research primarily focuses on RNMI within the first year post-index infarction.
• Prognosis following late RNMI remains under-investigated.

Purpose of the Study:

• To investigate the prognosis of nonfatal recurrent myocardial infarction (RNMI) based on the timing of its occurrence after an index myocardial infarction.
• To compare the mortality rates associated with early (first year) versus late (second to fourth year) RNMI.

Main Methods:

• A cohort of 3,867 unselected patients under 76 years with acute myocardial infarction was studied.
• Kaplan-Meier method was used for mortality estimation.
• Tarone-Ware test was employed to evaluate differences in mortality rates.

Main Results:

• 13.6% of patients experienced RNMI within the first year, with a 23.7% one-year mortality rate.
• 5.4%, 4.2%, and 3.8% experienced RNMI in the second, third, and fourth years, respectively.
• One-year mortality rates for late RNMI were 24.1% (year 2), 17.5% (year 3), and 22.8% (year 4).
• No statistically significant difference in mortality rates or standardized mortality ratios was found between early and late RNMI groups (p = 0.12).

Conclusions:

• Late and early nonfatal recurrent myocardial infarctions (RNMIs) share a similarly grave prognosis.
• The timing of RNMI after an index infarction does not significantly alter the associated mortality risk.
• Patients experiencing RNMI, regardless of timing, face a substantial and consistent risk of death.