title: [Relationship between chronic congestive heart failure and sleep-disordered breathing in elderly patients].
abstract: OBJECTIVE
  To determine the prevalence of sleep disordered breathing (SDB) in elderly patients with chronic congestive heart failure (CHF) and explore the relations between SDB and left ventricular function.
  
  
  METHODS
  By means of polysomnography, 56 elderly patients with CHF were divided into non-SDB, mild SDB, moderate SDB, and severe SDB groups, and the left ventricular ejection fraction (LVEF) was measure by (99)Tc equilibrium radionuclide angiography.
  
  
  RESULTS
  In the 56 elderly patients with CHF, 38 (67.9%) had SDB, including 12 (21.4%) mild SDB, 14 (25.0%) moderate SDB, and 12 (21.4%) severe SDB patients. Thirty (53.6%) of the 56 patients with CHF had obstructive sleep apnea (OSA), 4 (7.1%) had central sleep apnea and 22 (39.2%) had mixed sleep apnea. The moderate and severe SDB groups had lower minimum arterial oxyhemoglobin saturation during sleep than the non-SDB groups, and the apnea-hyponea index was closely related to LVEF (r=-0.74, P<0.01).
  
  
  CONCLUSIONS
  The prevalence of SDB, predominantly OSA, is high in elderly patients with CHF. Moderate and severe SDB might affect the left ventricular function in these patients, who require polysomnography monitoring.
authors.affiliation: Guangdong Provincial Geriatics Institute, Guangdong Provincial People's Hospital, Guangzhou 510080, China. liuhuixia89@21cn.com
authors.forename: Hui-xia
authors.initials: HX
authors.lastname: Liu
authors.forename: Ping
authors.initials: P
authors.lastname: Huang
authors.forename: Yong-chi
authors.initials: YC
authors.lastname: Chen
authors.forename: Sheng-qing
authors.initials: SQ
authors.lastname: Zhuo
authors.forename: Zhi-an
authors.initials: ZA
authors.lastname: Zhong
authors.forename: Hui-jian
authors.initials: HJ
authors.lastname: Yang
authors.forename: Qiong
authors.initials: Q
authors.lastname: Ou
authors.forename: Rui-jin
authors.initials: RJ
authors.lastname: Cen
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D002681:China / Q000453:epidemiology; D002908:Chronic Disease; D005260:Female; D006333:Heart Failure / Q000150:complications* / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D017286:Polysomnography; D012891:Sleep Apnea Syndromes / Q000150:complications* / Q000453:epidemiology; D018487:Ventricular Dysfunction, Left / Q000503:physiopathology*