Atrial fibrillation increases mortality and is an independent risk factor for heart failure and stroke. Cardiac magnetic resonance feature tracking (CMR-FT) is a post-processing technique that can quantitatively assess myocardial deformation. The result showed that patients with Atrial fibrillation had lower left ventricle longitudinal strain (LVLS) and left atrial longitudinal strain（LALS）compared with healthy control，which may due to impaired function and myocardial injury. Therefore, measuring the longitudinal strain of the left atrium and left ventricle can be used as an important method to evaluate the function of patients with atrial fibrillation.
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