Impact of Recent COVID-19 on Mortality After Myocardial Infarction: Danish Cohort Study
Overview
This nationwide Danish cohort study found that recent COVID-19 infection was associated with increased 30-day mortality following a first-time myocardial infarction (MI), particularly among unvaccinated patients. Prior COVID-19 vaccination appeared to mitigate this increased short-term mortality risk.
Background
COVID-19 infection has been linked to triggering acute cardiovascular events, including myocardial infarction (MI). Previous studies have shown elevated risks of MI shortly after COVID-19 infection, but the impact of recent COVID-19 on MI prognosis remains unclear. Vaccination against COVID-19 is known to reduce severe outcomes of infection, but its effect on MI outcomes post-COVID-19 has not been well studied. Understanding these associations is critical for managing cardiovascular risk in the context of the ongoing pandemic.
Data Highlights
Outcome
Adjusted Hazard Ratio (HR)
95% Confidence Interval (CI)
Population
30-day mortality after MI
1.64
1.16–2.31
Recent COVID-19 vs. no recent COVID-19 (all patients)
180-day mortality after MI
1.28
0.92–1.78
Recent COVID-19 vs. no recent COVID-19 (all patients)
30-day mortality after MI
2.88
1.78–4.64
Unvaccinated patients with recent COVID-19 vs. no recent COVID-19
180-day mortality after MI
2.09
1.30–3.36
Unvaccinated patients with recent COVID-19 vs. no recent COVID-19
30-day mortality after MI
1.11
0.65–1.90
Vaccinated patients with recent COVID-19 vs. no recent COVID-19
180-day mortality after MI
0.97
0.60–1.56
Vaccinated patients with recent COVID-19 vs. no recent COVID-19
Key Findings
Among 12,054 first-time MI patients, 337 had recent COVID-19 (positive PCR test within 90 days before to 1 day after MI).
Recent COVID-19 was associated with a 64% increased risk of 30-day mortality after MI (adjusted HR 1.64; 95% CI: 1.16–2.31).
The increased 30-day mortality risk was significantly higher in unvaccinated patients (HR 2.88; 95% CI: 1.78–4.64) compared to vaccinated patients (HR 1.11; 95% CI: 0.65–1.90).
No statistically significant increase in 180-day mortality was observed overall (HR 1.28; 95% CI: 0.92–1.78), but unvaccinated patients showed elevated risk (HR 2.09; 95% CI: 1.30–3.36).
Prior COVID-19 vaccination appeared to attenuate the increased mortality risk associated with recent COVID-19 infection after MI.
Clinical Implications
Clinicians should recognize that recent COVID-19 infection increases short-term mortality risk following myocardial infarction, especially in unvaccinated patients. COVID-19 vaccination may provide protective benefits by reducing this elevated risk. These findings support prioritizing vaccination in patients at risk for cardiovascular events and highlight the need for close monitoring of MI patients with recent COVID-19, particularly if unvaccinated.
Conclusion
Recent COVID-19 infection is associated with increased short-term mortality after myocardial infarction, predominantly among unvaccinated individuals. Prior COVID-19 vaccination mitigates this risk, underscoring the importance of vaccination in patients with cardiovascular disease.
References
Danish Nationwide Cohort Study 2022 -- Impact of Recent COVID-19 on Mortality Rates Following Myocardial Infarction
