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Article Abstract
Objective: The purpose of the present study was to describe our experience with myocardial infarction with normal coronary arteries (MINCA) with regards to the prevalence, clinical characteristics, possible underlying etiologies (including Takotsubo cardiomyopathy, TCM) and the short- and long-term outcomes associated with this condition.
Methods: We retrospectively analyzed the records of 596 consecutive patients presenting with acute myocardial infarction over a 4-year period and identified 24 patients (14 female, 10 male) with angiographically normal coronary arteries. Demographic and clinical variables and outcomes were reviewed.
Results: Mean patient age was 59 +/- 20 years. The presumed MINCA mechanism was TCM in 10 patients (41.7%), probable myocarditis in 5 (20.8%), coronary spasm in 4 (16.7%), coronary thrombus in 3 (12.5%) and aortic dissection in 2 patients (8.3%). After a mean follow-up of 19 +/- 14 months, 2 patients with probable myocarditis had died of cardiovascular causes, 1 patient with aortic dissection had died due to sepsis after surgery and 1 patient with TCM had died of noncardiovascular causes 2 years after discharge.
Conclusion: In this study, we found that MINCA occurred in 4% of patients with acute myocardial infarction undergoing emergent coronary angiography, with the most frequent underlying mechanism being TCM.
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