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Silent myocardial infarction (SMI) is defined as pathologic Q-waves without history of typical cardiac symptoms. To learn more, researchers used data from the longitudinal, biracial, community-based ARIC study. The 9498 participants in this analysis were free of cardiovascular disease at baseline in 1987–1989 and had periodic study visits through 1996–1998 (mean age at baseline, 54; women, 57%; black participants, 20%).
During a median follow-up of 8.9 years, 317 participants (3.3%) developed SMI, and 386 (4.1%) developed MI with clinical symptoms (CMI). Men had significantly higher incidence rates of SMI and CMI than women. The incidence rate of SMI trended higher in blacks than in whites, whereas whites had a significantly higher rate of C…