Objective To investigate the mechanism of left atrial spontaneous echo contrast(SEC)in patients with nonvalvular atrial fibrillation(NVAF)and valvular atrial fibrillation(VAF).

目的研究瓣膜性心房颤动（房颤）和非瓣膜性房颤患者左心房自发声学显影（SEC）的形成机制。

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Objective:The purpose of this study was to observe the relationship between left atrial hemorheological property and spontaneous echo contrast(SEC) in rheumatic mitral stenosis.

目的：探讨风湿性二尖瓣狭窄患者左心房血液流变学特点及与左心房自回声现象（SEC）的关系。

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Objective: the purpose of study was to observe the relationship be tween left atria hemorheological property and left atria spontaneous echo contrast (SEC) in rheumatic mitral stenosis.

目的：探讨风湿性二尖瓣狭窄患者左心房内自回声现象(SEC)与左心房血液流变学特点的关系。

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