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Background: Left atrial appendage (LAA) anatomy and function have been well characterized both in healthy and diseased people, whereas relatively little attention has been focused on the right atrial appendage (RAA). We sought to evaluate RAA flow velocity and to compare these parameters with LAA indices and with a study of biomarkers, such as brain natriuretic peptide,among patients with sinus rhythm (SR) and atrial fibrillation (AF). Methods: In a series of 79 consecutive patients referred for transesophageal echocardiography, 43 patients (23 with AF and 20controls) were evaluated. Results: AF was associated with a decrease in flow velocity for both LAA and RAA [LAA velocity-SR vs. AF: 61 22 vs. 2918 m/sec (p < 0.01), RAA velocity-SR vs. AF: 46 20 vs. 19 8 m/sec (p < 0.01)]. Based on simple linear regression analysis,LAA velocity and RAA velocity were positively correlated, and RAA velocity was inversely correlated with brain natriuretic peptide (BNP). Conclusion: AF was associated with decreased RAA and LAA flow velocities. RAA velocity was found to be positively correlated with LAA velocity and negatively correlated with BNP. The plasma BNP concentration may serve as a determinant of LAA and RAA functions.

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