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Cardiovascular Mortality After Type 1 and Type 2 Myocardial Infarction in Young Adults
Avinainder Singh1, Ankur Gupta2, Ersilia M DeFilippis3
1Department of Medicine, Yale University School of Medicine, New Haven, Connecticut. Electronic address: https://twitter.com/AvinainderSingh.
Insights
Young adults with type 2 myocardial infarction (MI) or myocardial injury face higher long-term mortality than type 1 MI. Aggressive secondary prevention is crucial for these patients.
Area of Science:
- Cardiology
- Clinical Medicine
- Public Health
Background:
- Type 2 myocardial infarction (MI) and myocardial injury are linked to increased short-term mortality.
- Long-term mortality data for these conditions in young adults are limited.
Purpose of the Study:
- To compare long-term mortality among young adults (≤50 years) diagnosed with type 1 MI, type 2 MI, or myocardial injury.
- To identify differences in mortality risk and clinical characteristics across these MI types.
Main Methods:
- A cohort of 3,829 young adults diagnosed with MI or myocardial injury over 17 years was analyzed.
- Patients were categorized based on the Fourth Universal Definition of MI.
- Cox proportional hazards models assessed all-cause and cardiovascular death risk.
Main Results:
- Mortality was highest for myocardial injury (45.6%), followed by type 2 MI (34.2%), and type 1 MI (12%) over 10.2 years.
- Type 2 MI was associated with significantly higher all-cause and cardiovascular mortality compared to type 1 MI.
- Patients with type 2 MI/myocardial injury were younger, had fewer cardiovascular risk factors, but more noncardiovascular comorbidities.
Conclusions:
- Young patients with type 2 MI face elevated long-term mortality risks compared to type 1 MI.
- Nearly half of myocardial injury patients and over a third of type 2 MI patients died within 10 years.
- Enhanced secondary prevention strategies are essential for type 2 MI and myocardial injury patients.
Background:
Type 2 myocardial infarction (MI) and myocardial injury are associated with increased short-term mortality. However, data regarding long-term mortality are lacking.
Objectives:
This study compared long-term mortality among young adults with type 1 MI, type 2 MI, or myocardial injury.
Methods:
Adults age 50 years or younger who presented with troponin >99th percentile or the International Classification of Diseases code for MI over a 17-year period were identified. All cases were adjudicated as type 1 MI, type 2 MI, or myocardial injury based on the Fourth Universal Definition of MI. Cox proportional hazards models were constructed for survival free from all-cause and cardiovascular death.
Results:
The cohort consisted of 3,829 patients (median age 44 years; 30% women); 55% had type 1 MI, 32% had type 2 MI, and 13% had myocardial injury. Over a median follow-up of 10.2 years, mortality was highest for myocardial injury (45.6%), followed by type 2 MI (34.2%) and type 1 MI (12%) (p < 0.001). In an adjusted model, type 2 MI was associated with higher all-cause (hazard ratio: 1.8; 95% confidence interval: 1.2 to 2.7; p = 0.004) and cardiovascular mortality (hazard ratio: 2.7; 95% confidence interval: 1.4 to 5.1; p = 0.003) compared with type 1 MI. Those with type 2 MI or myocardial injury were younger and had fewer cardiovascular risk factors but had more noncardiovascular comorbidities. They were significantly less likely to be prescribed cardiovascular medications at discharge.
Conclusions:
Young patients who experience a type 2 MI have higher long-term all-cause and cardiovascular mortality than those who experience type 1 MI, with nearly one-half of patients with myocardial injury and more than one-third of patients with type 2 MI dying within 10 years. These findings emphasize the need to provide more aggressive secondary prevention for patients who experience type 2 MI and myocardial injury.
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