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Decreasing case fatality in myocardial infarction is explained by improved medical treatment
Karl Andersen1, Bergrós Kristín Jóhannesdóttir, Jón M Kristjánsson
1University of Iceland, Faculty of Medicine, Reykjavik, Iceland. andersen@lsh.is
Insights
Improved medical management, including aspirin, beta-blockers, and reperfusion therapy, significantly reduced one-year mortality for ST-elevation myocardial infarction (STEMI) patients. Increased age and diuretic use were associated with higher mortality rates.
Area of Science:
- Cardiology
- Public Health
Background:
- Treatment strategies for ST-elevation myocardial infarction (STEMI) have evolved over the past 20 years.
- Understanding the impact of these changes on patient outcomes is crucial.
Purpose of the Study:
- To investigate the effect of evolving STEMI treatment on one-year mortality.
- To identify key factors influencing survival rates after STEMI.
Main Methods:
- Retrospective analysis of all STEMI hospital admissions in Reykjavik, Iceland, for 1986, 1996, and 2006.
- Cox proportional hazard analysis to determine factors associated with one-year mortality.
Main Results:
- One-year mortality for STEMI decreased significantly from 26.3% in 1986 to 12.9% in 2006.
- Aspirin, reperfusion therapy, and beta-blockers at discharge were strongly associated with reduced mortality.
- Diuretic use and advanced age correlated with increased one-year mortality.
Conclusions:
- Improved medical management, particularly aspirin, beta-blockers, and reperfusion therapy, has driven the reduction in STEMI one-year mortality.
- Aggressive reperfusion strategies and appropriate discharge medications are key to improving survival.
- Congestive heart failure (indicated by diuretic use) and older age remain negative prognostic factors.
Objective:
Treatment of ST-elevation myocardial infarction (STEMI) has changed significantly over the past two decades. We investigated the effect of these changes on one-year mortality.
Methods And Results:
All hospital admissions for STEMI in Reykjavik, Iceland, during the calendar years of 1986, 1996 and 2006 were studied. One-year mortality was related to changes in the use of reperfusion strategies and medication at hospital discharge. One-year mortality decreased from 26.3% in 1986 and 19.7% in 1996 to 12.9% in 2006 (P= 0.001). Cox proportional hazard analysis showed that aspirin (HR 0.29), the use of reperfusion therapy (HR 0.51) and beta-blockers at hospital discharge (HR 0.53) were the strongest factors to explain the mortality reduction while the use of diuretics (HR 1.42) and age (HR 1.06) were related to increased one-year mortality.
Conclusions:
The reduction in one-year mortality after myocardial infarction during the last two decades is explained by improved medical management with aspirin, beta-blockers and aggressive reperfusion therapy. Diuretic therapy, reflecting congestive heart failure, and increased age have negative effects on survival.
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