In this study, patients who meet the criteria will be screened through pre-hospital recruitments and in-hospital inpatients. The patients and their families will approve the study program and sign the informed consent form. The observation group will receive SFI (SFI 50 mg / kg CS100 ml, ivgtt, qd) combined with furosemide injection (Furosemide 20 mg / kg GS 250 ml, ivgtt, qd), while the control group will only receive furosemide injection (Furosemide 20 mg / kg GS 250 ml, ivgtt, qd). Patients in both groups will receive the same routine care and drug treatment, such as angiotensin converting enzymeinhibitiors (ACEIs) or angiotensin II receptor blockers (ARBs). If necessary, the attending physician can adjust the plan according to the patient's condition, and all interventions will be recorded in detail for final result analysis. We will set up a special drug manager, and the nurse will be responsible for preparing the medicine, preparing the solution, and using the disposable optical infusion device to infuse the corresponding numbered patients. Therefore, the study is not blind to nurses, but to researchers, patients, and statisticians. All patients will receive intravenous injections once a week. The health status of each patient will be evaluated before and after treatment, including efficacy and safety indicators, and all patients will be followed up for 30 d by telephone or outpatient clinic. Follow-up will include cardiovascular events and rehospitalization.

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