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Methodologic sources of inconsistent prognoses for post-acute myocardial infarction
1Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut 06510, USA.
The American Journal of Medicine
|June 1, 1995
Summary
Studies on myocardial infarction (MI) prognosis often lack methodological rigor, leading to inconsistent results. Adhering to basic principles can improve future research and predictor applicability.
Area of Science:
- Cardiology
- Clinical Epidemiology
- Biostatistics
Background:
- Prognostic studies in myocardial infarction (MI) report inconsistent findings.
- Methodological limitations may explain these discrepancies in predictor variable results.
Purpose of the Study:
- To identify fundamental methodological issues in post-MI prognosis studies.
- To investigate reasons for contradictory results concerning predictor variables.
Main Methods:
- A systematic literature search identified 111 eligible post-MI prognosis studies (1979-1991).
- Eight methodological standards were established and applied to assess study quality.
- Eligibility criteria included cohort studies/RCTs, sample size >= 50, defined follow-up, and multivariable analysis.
Main Results:
- Most studies (111/766) met eligibility criteria but often failed to adhere to methodological standards.
- Median adherence to 8 standards was only 3, with a maximum of 6.
- Key weaknesses included: analysis of baseline severity (13-20%), cause-specific death verification (37%), and impact of treatment (13%).
Conclusions:
- Post-MI prognosis research frequently overlooks essential methodological principles.
- Improved adherence to methodological standards is crucial for consistent findings.
- Enhancing research quality will improve the interpretation and applicability of prognostic predictors.