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Cardiac function evaluated by echocardiography at postoperative Day 28. A Representative echocardiography images of different groups. B Left ventricle ejection fraction (EF). C Fractional shortening (FS). D The left ventricular internal diameter at end-systole (LVIDs). E The left ventricular internal diameter at end-diastole (LVIDd). *P < 0.05 and **P < 0.01, ***P < 0.001, ****P < 0.0001
