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。

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

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目的比较华法林和阿司匹林对非瓣膜性心房颤动患者的抗凝疗效。

Objective To explore the antithrombotic effects of warfarin and aspirin in nonvalvular atrial fibrillation.

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目的：评价风湿性瓣膜病合并心房颤动（房颤）经导管射频消融的安全性和疗效。

Objective to evaluate the efficacy and safety of catheter ablation for atrial fibrillation(AF) in cases with rheumatic valvular heart disease.

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目的：评价风湿性瓣膜病合并心房颤动（房颤）经导管射频消融的安全性和疗效。

Objective to evaluate the efficacy and safety of catheter ablation for atrial fibrillation(AF) in cases with rheumatic valvular heart disease.

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