Objectives: Spontaneous echo contrast (SEC) is the presence of smoke-like echoes with a characteristic swirling motion of the blood in echocardiography. Previous clinical studies have shown that SEC is a risk factor for left atrial thrombus formation and a predictor of potential systemic embolism originating from the heart. There is an association between uric acid and prothrombotic state. Therefore, we aimed to investigate the role of uric acid in SEC in patients with mitral stenosis (MS).
Methods: A total of 85 consecutive patients with MS were enrolled in the study. Patients were divided into two groups according to whether SEC was present in the left atrium.
Results: There were 41 patients (mean age 46.4 ± 11.4 and 68% female) in the SEC(-) group and 44 patients (mean age 45.7 ± 7.2 and 64% female) in the SEC(+) group. High sensitive C-reactive protein (hs-CRP) levels were significantly higher in the SEC(+) group than in the SEC(-) group (9.5 ± 4.2 vs. 4.7 ± 2.2 mg/L, P < 0.001). Uric acid was also significantly higher in the SEC (+) group (6.3 ± 1.4 vs. 4.5 ± 1.3 mg/dL, P < 0.001). In receiver operating characteristics curve analysis, uric acid >5.2 mg/dL had a 73% sensitivity and 76% specificity in predicting SEC in patients with MS. At multivariate analysis, uric acid (OR 3.919, 95% CI 1.911-8.035; P < 0.002) was an independent risk factor for SEC in patients with MS.
Conclusion: Uric acid is independently associated with SEC in patients with MS. Our findings suggest that this inexpensive, universally available marker may be a useful biomarker for the stratification of risk in patients with MS.
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