Background: To assess the incidence, clinical significance, and independent risk factors of stroke in patients with acute myocardial infarction (AMI) treated invasively.
Materials And Methods: We analyzed 2520 consecutive patients with AMI admitted between 2003 and 2007. Data on long-term follow-up were screened to identify patients who had stroke.
Results: During a median of 25.5 months, 52 patients (2.07%) had stroke. The cumulative risk of stroke was the highest during the first year (1.23%) and particularly within the first month after AMI (0.28%). Patients with stroke were at a significantly higher risk of developing major adverse cardiovascular events, including repeated AMI (26.9 vs. 14.6%, P<0.05) and death (40.4 vs. 13.6%, P<0.001). Previous stroke [hazard ratio (HR) 5.89], female sex (HR 2.60), glomerular filtration rate <60 ml/min/1.73 m (HR 1.92), and contrast nephropathy (HR 1.87, all P<0.05) were independent predictors of stroke. The receiver-operating curve calculated for the Contrast nephropathy, renal Insufficiency, Female, prior Stroke (CIFS) risk scale demonstrated a significant predictive value of this scale (area under curve 0.73, P<0.001). Patients with the lowest, median, and highest risk scores (<4, 4-5, ≥6 points, respectively) differed significantly with regard to stroke incidence (2.1 vs. 7.9 vs. 14.0%, respectively, P<0.05).
Conclusion: The risk of stroke is the highest within the first month after AMI. Stroke is a marker of unfavorable outcome in this population. Independent risk factors for stroke after invasive treatment of AMI are different from those commonly perceived as stroke predictors. A risk scale based on sex, stroke history, and renal impairment is useful in risk stratification.
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