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Aspirin in coronary heart disease. Comparison of six clinical trials
Insights
Daily aspirin use in post-myocardial infarction (MI) patients showed a 10% reduction in total mortality, particularly in the first year. However, aspirin also increased risks of gastrointestinal side effects and elevated blood pressure.
Area of Science:
- Cardiology
- Clinical Pharmacology
Background:
- Post-myocardial infarction (MI) management aims to reduce mortality and reinfarction.
- Aspirin is a widely used antiplatelet agent with known benefits and risks.
Purpose of the Study:
- To meta-analyze randomized, placebo-controlled trials of aspirin in post-MI patients.
- To quantify the overall effect of aspirin on mortality and morbidity after MI.
Main Methods:
- Combined data from six randomized, placebo-controlled clinical trials.
- Included 10,703 patients who had experienced a myocardial infarction.
- Adjusted for prognostically important baseline factors.
Main Results:
- Aspirin demonstrated a 10% reduction in total mortality (P = 0.044).
- Beneficial effects were most pronounced in the first year post-MI.
- Significant reductions in nonfatal MI and MI-related hospitalizations were observed.
- Adverse effects included gastrointestinal issues (stomach pain, heartburn, vomiting), elevated systolic blood pressure (>160 mm Hg), and increased serum urea nitrogen and uric acid levels.
Conclusions:
- Daily aspirin therapy offers a significant survival benefit for post-MI patients.
- The benefits of aspirin in reducing mortality and reinfarction must be weighed against its potential adverse effects.
- Further research may explore optimal duration and patient selection for aspirin therapy.
Abstract:
Data from six randomized, placebo-controlled clinical trials of aspirin, involving a total of 10,703 postmyocardial infarction (MI) patients, are compared and combined. After adjustment for a number of prognostically important baseline factors, the reduction in total mortality by aspirin was 10% (P = 0.044). This beneficial trend was particularly pronounced during the 1st yr of daily aspirin ingestion, but did not differ between patients who entered the trial less than 6 mo and greater than 6 mo after their last MI. Significant beneficial effects of aspirin were noted with respect to 1) diagnosis of definite nonfatal MI and 2) hospitalization for greater than 2 wk for MI. Significant adverse effects of aspirin were noted with respect to the side effects of stomach pain, heartburn and vomiting, elevation of systolic blood pressure to greater than 160 mm Hg, and elevation of serum urea nitrogen and serum uric acid levels to the abnormal range.
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