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Introduction: Previous studies have shown that various factors such as emotional stress can trigger of MI in susceptible persons. More studies are needed to evaluate the characteristics of patients regarding to emotional stress, heavy work, routine activity, infection or rest before occurrence of MI. Methods: We studied 608 consecutive hospitalized in CCUs from May 2000 to October 2001. For patients, questionnaires including demographic, clinical and paraclinical characteristics were completed and data analyzed. Results: In this study rest (33.4%) and ordinary activity (32.4%) were more prevalent among the MI situations and infection had the lowest prevalence (0.7%). In patients higher than 45 years we had similar results, but in age group younger than 45 year ordinary activity (30.6%) and after heavy work (20.8%) had the highest prevalence before occurring of MI. In Diabetic patients, MI developed in sleep situation more frequently.(17.8%),(P=0.03) 52.5% of MI mortality occurred in rest situation.(P=0.009) Conclusion: Rest had the highest prevalence of MI compared to other situations but in age group younger than 45 years MI after heavy work had the highest prevalence. Autonomic neuropathy may be one of the reason of higher prevalence of MI in sleep situation.

Keywords: Myocardial Infarction, Emotional stress, Heavy work, Heavy meal, ordinary activity, sleep, rest, infection.

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