• Kun Zuo, Lanlan Sun, Xinchun Yang, Xiuzhang Lyu, and Kuibao Li.
• Department of Cardiology, Chaoyang Hospital, Capital Medical University, Beijing, China.
• Clin Cardiol. 2017 Feb 1; 40 (2): 120-125.

BackgroundThe CHA2 DS2 -VASc score is a classic predictor of stroke in patients with atrial fibrillation (AF). Decreased left atrial appendage flow velocity (LAA-FV) reflects the blood stasis, and left atrial (LA) strain is a manifestation of atrial remodeling. This study aimed to explore the effects of AF rhythm and CHA2 DS2 -VASc score in the development of thrombogenesis and their potential correlation with LAA-FV and LA strain.HypothesisAF rhythm and high CHA2 DS2 -VASc score correlate independently with decreased LAA-FV, which can be predicted by LA strain.MethodsIn 98 AF patients, LAA-FV was measured by transesophageal echocardiography and LA strain was measured by transthoracic echocardiography.ResultsLAA-FV decreased sharply in the AF rhythm group (26.22 vs 61.87 mm/s; P < 0.001), and CHA2 DS2 -VASc score did not differ between the decreased and normal LAA-FV groups in all patients (P = 0.289). However, in sinus rhythm (SR), LAA-FV was associated with CHA2 DS2 -VASc score (coefficient = -0.317, P = 0.013), and the CHA2 DS2 -VASc score differed between the normal and decreased LAA-FV groups (2 [0-7] vs 3 [0-6], respectively; P = 0.038). Moreover, LA strain was a predictor of LAA-FV in both AF rhythm and SR, whereas a peak positive systolic strain divided by LA volume index <0.744 predicted decreased LAA-FV.ConclusionsAF rhythm caused a sharp decrease in LAA-FV independent of CHA2 DS2 -VASc score. In SR, the CHA2 DS2 -VASc score correlated negatively with LAA-FV. LA strain was a predictor of LAA-FV in both SR and AF rhythm.© 2017 Wiley Periodicals, Inc.

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