NCT01187823COMPLETEDNAThe aim of this study is to compare the effects of Adaptive Servo Ventilation (Bipap® auto SV Advanced) and oxygen therapy in chronic heart failure patients complicated with central sleep apnea.
Inclusion Criteria: * Left ventricular ejection fraction\<50% confirmed by echocardiography * Apnea hypopnea index(AHI)\>=20 confirmed by overnight polysomnography * More than 15% of AHI is due to CSA Exclusion Criteria: * Changes of cardioactive drug prescriptions within 6 weeks * Admission due to cardiovascular events within 6 weeks * Ever used CPAP or ASV for sleep apnea * Ever used nocturnal oxgen therapy * Subjects with acute exacerbation of chronic heart failure * Operation for upper airway within 90 days * Renal dialysis * History of stroke with neurological deficit