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。
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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