Department of Cardiology Beijing Anzhen Hospital Capital Medical University National Clinical Research Center for Cardiovascular Diseases Beijing 100029 China;
Department of Cardiology Beijing Anzhen Hospital Capital Medical University National Clinical Research Center for Cardiovascular Diseases Beijing 100029 China;
Department of Cardiology Beijing Anzhen Hospital Capital Medical University National Clinical Research Center for Cardiovascular Diseases Beijing 100029 China;
Department of Cardiology Beijing Anzhen Hospital Capital Medical University National Clinical Research Center for Cardiovascular Diseases Beijing 100029 China;
Department of Cardiology Beijing Anzhen Hospital Capital Medical University National Clinical Research Center for Cardiovascular Diseases Beijing 100029 China;
Heart failure with reduced ejection fraction; Frailty; Elderly; Adverse events;