This study demonstrates that younger patients (<60 years) with ST-segment elevation myocardial infarction (STEMI) exhibit more pronounced adverse left ventricular remodeling compared to older patients (≥60 years) despite timely reperfusion and optimal therapy. Serial cardiac magnetic resonance imaging (CMR) revealed significant differences in ventricular volumes and function between age groups over a 3-month follow-up.
Background
STEMI remains a major cause of morbidity and mortality worldwide, with younger individuals accounting for about half of all cases and showing no decline in incidence unlike older populations. Younger STEMI patients often have fewer traditional cardiovascular risk factors but face a relatively higher risk of heart failure post-infarction. Ventricular remodeling after STEMI is a key determinant of prognosis, yet age-related differences in remodeling patterns have not been fully elucidated. This study aimed to compare serial CMR data between younger and older STEMI patients undergoing primary percutaneous coronary intervention (PPCI).
Data Highlights
Parameter
Young (<60 years)
Old (≥60 years)
Significance
LV End-Diastolic Volume Index (LVEDVi) % Change
Higher increase indicating adverse remodeling
Lower increase
p < 0.05
LV End-Systolic Volume Index (LVESVi) % Change
Greater increase
Smaller increase
p < 0.05
LV Ejection Fraction (LVEF)
More pronounced decline or less improvement
Better preservation or improvement
p < 0.05
Myocardial Salvage Index (MSI)
Comparable between groups
Comparable between groups
NS
Key Findings
Younger STEMI patients showed significantly greater adverse left ventricular remodeling as evidenced by increased LVEDVi and LVESVi on follow-up CMR.
Despite similar infarct sizes and myocardial salvage indices, younger patients had worse ventricular functional recovery compared to older patients.
Global strain parameters indicated impaired myocardial deformation in younger patients post-STEMI.
Older patients demonstrated relatively preserved or improved left ventricular ejection fraction over 3 months.
Adverse remodeling in younger patients occurred despite timely PPCI and optimal medical therapy.
Clinical Implications
Clinicians should recognize that younger STEMI patients are at higher risk for adverse ventricular remodeling and subsequent heart failure despite fewer traditional risk factors and adequate reperfusion. Serial CMR assessment may be valuable in this population to identify early remodeling and guide intensified monitoring or therapeutic strategies. Tailored interventions targeting remodeling pathways could improve long-term outcomes in younger STEMI survivors.
Conclusion
Younger patients with STEMI experience greater adverse ventricular remodeling compared to older patients, highlighting the need for age-specific post-infarction management strategies. Cardiac MRI provides critical insights into remodeling dynamics that can inform prognosis and therapy.
References
European Society of Cardiology Guidelines 2019 -- STEMI Definition and Management
World Health Organization 2020 -- Age Stratification Standards
Recent Literature on Post-STEMI LV Remodeling -- Clinical Outcomes Correlation
