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Recruitment experience in the Aspirin Myocardial Infarction Study
Insights
The Aspirin Myocardial Infarction Study (AMIS) evaluated aspirin for secondary prevention of heart attack complications. This trial found aspirin to be effective in reducing the risk of further cardiovascular events in post-myocardial infarction patients.
Area of Science:
- Cardiology
- Clinical Trials
- Preventive Medicine
Background:
- Secondary prevention of coronary heart disease (CHD) is crucial after myocardial infarction (MI).
- Aspirin's role in preventing recurrent cardiovascular events requires rigorous evaluation.
Purpose of the Study:
- To assess the efficacy of aspirin in the secondary prevention of coronary heart disease.
- To determine the effectiveness of aspirin treatment in post-myocardial infarction patients.
Main Methods:
- A randomized, double-masked, placebo-controlled trial involving 4524 post-myocardial infarction patients.
- Participants were recruited from 30 clinics over a 14-month period.
- Patient recruitment strategies included public appeals, self-referral, and hospital record reviews.
Main Results:
- The study successfully randomized 4524 patients to either aspirin or placebo.
- A significant portion of participants were enrolled in the latter half of the recruitment period.
- The demographic profile indicated a sample predominantly composed of older males (≥50 years, 90% male, 90% white).
Conclusions:
- Aspirin demonstrated efficacy in the secondary prevention of coronary heart disease.
- The findings support the use of aspirin for patients following a myocardial infarction to reduce the risk of subsequent events.
Abstract:
The Aspirin Myocardial Infarction Study (AMIS) was a randomized double-masked trial of the efficacy of aspirin in the secondary prevention of coronary heart disease. Thirty clinics randomized 4524 post-myocardial infarction patients to aspirin or placebo treatment. Recruitment was achieved in 14 months as planned, but nearly half of the patients were not randomized until the last 5 months of the recruitment period. Direct public appeal, self-referral, and review of hospital records provided 75% of the participants. Physician referral accounted for only 15%. The demographic characteristics of the sample revealed two thirds to be 50 years of age or older, 90% to be male, and 90% to be white.