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—To determine the extent to which the elderly have been excluded from trials of drug therapies used in the treatment of acute myocardial infarction, to identify factors associated with such exclusions, and to explore the relationship between the exclusion of elderly and the representation of women.

—We conducted a systematic search of the English-language literature from January 1960 through September 1991 to identify all relevant studies of specific pharmacotherapies employed in the treatment of acute myocardial infarction. To accomplish this, we searched MEDLINE, major cardiology textbooks, meta-analyses, reviews, editorials, and the bibliographies of all identified articles.

—Only trials in which patients were randomly allocated to receive a specific therapeutic regimen or a placebo or nonplacebo control regimen were included for review.

—Studies were …