The Effect of Dapagliflozin on Myocardial Strain in Patients With Acute Heart Failure

Inclusion Criteria: * Informed consent from patient or next of kin； Eighteen years and older; Admitted to hospital due to acute heart failure； eGFR\> 25ml /min/1.73m2 (calculated by the MDRD equation)； Eligible patients will be enrolled within 24 hours to 14 days after admission, while still hospitalized and in a stable condition. Exclusion Criteria: * Type I diabetes mellitus; Systolic blood pressure \< 90mmHg at enrollment or positive inotropic drugs are required at enrollment or are expected to be used during hospitalization; Non-cardiac dyspnea； Known hypersensitivity to dapagliflozin； Previous treatment with any SGLT2 inhibitor； History of diabetic ketoacidosis within 3 months； Patients on dialysis； Current atrial fibrillation； Poor echocardiographic images quality prohibiting speckle tracking echocardiography analysis； History of arrhythmia (multifocal premature ventricular contractions, bigeminy, trigeminy, ventricular tachycardia), which is symptomatic or requires treatment (CTCAE Grade 3) or asymptomatic sustained ventricular tachycardia，congenital long QT syndrome, history of QT prolongation associated with other medications that required discontinuation of that medication; Diagnosis of hypertrophic obstructive cardiomyopathy, reversible cardiomyopathy (such as stress cardiomyopathy), cardiac infiltrative diseases (such as myocardial amyloidosis), constrictive pericarditis, severe valvular heart disease (moderate or severe aortic stenosis, severe aortic regurgita…