title: Bi-level positive pressure ventilation and adaptive servo ventilation in patients with heart failure and Cheyne-Stokes respiration.
abstract: OBJECTIVE
  Nocturnal positive pressure ventilation (PPV) has been shown to be effective in patients with impaired left ventricular ejection fraction (LVEF) and Cheyne-Stokes respiration (CSR). We investigated the effect of a bi-level PPV and adaptive servo ventilation on LVEF, CSR, and quantitative sleep quality.
  
  
  METHODS
  Thirty-seven patients (New York heart association [NYHA] II-III) with LVEF<45% and CSR were investigated by electrocardiography (ECG), echocardiography and polysomnography. The CSR index (CSRI) was 32.3+/-16.2/h. Patients were randomly treated with bi-level PPV using the standard spontaneous/timed (S/T) mode or with adaptive servo ventilation mode (AutoSetCS). After 6 weeks, 30 patients underwent control investigations with ECG, echocardiography, and polysomnography.
  
  
  RESULTS
  The CSRI decreased significantly to 13.6+/-13.4/h. LVEF increased significantly after 6 weeks of ventilation (from 25.1+/-8.5 to 28.8+/-9.8%, p<0.01). The number of respiratory-related arousals decreased significantly. Other quantitative sleep parameters did not change. The Epworth sleepiness score improved slightly. Daytime blood pressure and heart rate did not change. There were some differences between bi-level PPV and adaptive servo ventilation: the CSRI decreased more in the AutoSetCS group while the LVEF increased more in the bi-level PPV group.
  
  
  CONCLUSIONS
  Administration of PPV can successfully attenuate CSA. Reduced CSA may be associated with improved LVEF; however, this may depend on the mode of PPV. Changed LVEF is evident even in the absence of significant changes in blood pressure.
authors.affiliation: Charite-Universitätsmedizin Berlin, CCM, Department of Internal Medicine, Center for Sleep Medicine, Luisenstr. 13, D-10117 Berlin, Germany. ingo.fietze@charite.de
authors.forename: Ingo
authors.initials: I
authors.lastname: Fietze
authors.forename: Alexander
authors.initials: A
authors.lastname: Blau
authors.forename: Martin
authors.initials: M
authors.lastname: Glos
authors.forename: Heinz
authors.initials: H
authors.lastname: Theres
authors.forename: Gert
authors.initials: G
authors.lastname: Baumann
authors.forename: Thomas
authors.initials: T
authors.lastname: Penzel
mesh_terms: D000368:Aged; D002639:Cheyne-Stokes Respiration / Q000150:complications / Q000503:physiopathology / Q000628:therapy*; D015331:Cohort Studies; D005260:Female; D006333:Heart Failure / Q000150:complications / Q000503:physiopathology* / Q000628:therapy; D006801:Humans; D008297:Male; D008875:Middle Aged; D017286:Polysomnography; D011175:Positive-Pressure Respiration / Q000379:methods*; D012891:Sleep Apnea Syndromes / Q000150:complications / Q000503:physiopathology / Q000628:therapy*; D013318:Stroke Volume / Q000502:physiology; D016896:Treatment Outcome