Risk factors for mortality in post-myocardial infarction patients: insights from the improve SCA bridge study
Dileep Kumar1,2, Fawaz Bardooli3, Wen-Jone Chen4
1Mohammed Bin Khalifa Specialist Cardiac Centre, Awali, Bahrain. dileep_dewani2011@yahoo.com.
Insights
Sudden cardiac death (SCD) risk factors in post-myocardial infarction (MI) patients include older age, reduced ejection fraction, and being from Southeast Asia. Identifying these patients can guide implantable cardioverter-defibrillator (ICD) use for prevention.
Area of Science:
- Cardiology
- Public Health
Background:
- Implantable cardioverter-defibrillators (ICDs) are underutilized for preventing sudden cardiac death (SCD) in post-myocardial infarction (MI) patients.
- Understanding regional risk factors is crucial for optimizing ICD adoption and patient selection.
Purpose of the Study:
- To identify risk factors for all-cause and cardiovascular mortality in post-MI patients.
- To inform strategies for SCD prevention in populations with low ICD use.
Main Methods:
- Analysis of risk factors for mortality in post-MI patients from the Improve Sudden Cardiac Arrest (SCA) Bridge Trial.
- Multivariate modeling to assess predictors of all-cause and cardiovascular mortality.
Main Results:
- Overall 1-year mortality was 5.9% (all-cause) and 3.4% (cardiovascular), with 76.5% of cardiac deaths due to SCD.
- Significant risk factors for all-cause mortality included increased age, reduced left ventricular ejection fraction (LVEF), longer time from MI to admission, female sex, being from Southeast Asia (SEA), and coronary artery disease.
- Increased age, reduced LVEF, and being from SEA were significant risk factors for cardiovascular mortality.
Conclusions:
- Specific patient characteristics predict cardiovascular mortality post-MI.
- Patients with identified risk factors warrant electrophysiologist referral for SCD risk stratification.
- Timely intervention, including potential ICD implantation, can reduce preventable deaths.
Background:
Underutilization of implantable cardioverter defibrillators (ICD) to prevent sudden cardiac death (SCD) in post-myocardial infarction (MI) patients remains an issue across several geographies. A better understanding of risk factors for SCD in post-MI patients from regions with low ICD adoption rates will help identify those who will benefit from an ICD. This analysis assessed risk factors for all-cause and cardiovascular-related mortality in post-MI patients from the Improve Sudden Cardiac Arrest (SCA) Bridge Trial.
Results:
For the entire cohort, the overall 1-year mortality rate was 5.9% (88/1491) and 3.4% (51/1491) for all-cause and cardiovascular mortality, respectively, with 76.5% of all cardiac deaths being from SCD. A multivariate model determined increased age, reduced left ventricular ejection fraction (LVEF), increased time from myocardial infarction to hospital admission, being female, being from Southeast Asia (SEA), and having coronary artery disease to be significant risk factors for all-cause mortality. The risk factors for cardiovascular-related mortality revealed increased age, reduced LVEF, and being from SEA as significant risk factors.
Conclusions:
We show several characteristics as being predictors of cardiovascular-related mortality in post-MI patients from the Improve SCA Bridge study. Patients who experience an MI and present with these characteristics would benefit from a referral to an electrophysiologist for further SCD risk stratification and management and possible subsequent ICD implantation to reduce unnecessary death.
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