title: Impact of continuous positive airway pressure treatment on left atrial volume and function in patients with obstructive sleep apnoea assessed by real-time three-dimensional echocardiography.
abstract: BACKGROUND
  Obstructive sleep apnoea (OSA) has been reported as a predictor of left ventricle (LV) diastolic dysfunction and left atrium (LA) remodelling. The aim of this study is to evaluate the impact of OSA treatment with a continuous positive airway pressure device (CPAP) on the LA volume and function, as well as on the LV diastolic function.
  
  
  METHODS
  In total, 56 OSA patients were studied. All patients underwent real-time three-dimensional (RT3DE) and two-dimensional echocardiogram with tissue Doppler evaluation in order to estimate LA volumes, function and LV diastolic performance. A total of 30 patients with an apnoea-hypopnoea index greater than 20 were randomly selected to receive sham CPAP (n = 15) or effective CPAP (n = 15) for 24 weeks. They underwent echo examination on three different occasions: at baseline, after 12 weeks and 24 weeks of CPAP or sham CPAP.
  
  
  RESULTS
  In the effective CPAP group we observed the following changes from the baseline to the 24-week echo evaluation: (a) a reduction in the E/E' ratio (10.3 (1.9) to 7.9 (1.3), p = 0.03); (b) an increase in the LA passive emptying fraction (28.8% (11.9%) to 46.8% (9.3%), p = 0.01); and (c) a reduction in the LA active emptying fraction (42.7% (11.5%) to 25.7 (15.7), p<0.01). In the sham group, there were no changes from the baseline to the 24-week echo. We found a positive correlation between 24 week/baseline LA active emptying volume and 24 week/baseline E/E' ratios (r = 0.40, p<0.05) and a negative correlation between 24 week/baseline LA passive emptying volume and 24 week/baseline E/E' ratios (r = -0.53, p<0.05). No significant changes were found on LA total emptying fraction.
  
  
  CONCLUSIONS
  CPAP improved LV diastolic function and LA passive emptying, but not LA structural variables in OSA patients.
  
  
  BACKGROUND
  NCT00768807.
authors: Discipline of Sleep Biology and Medicine, Department of Psychobiology, Federal University of Sao Paulo, Sao Paulo, Brazil.
authors: W
authors: W
authors: Oliveira
authors: O
authors: O
authors: Campos
authors: F
authors: F
authors: Cintra
authors: L
authors: L
authors: Matos
authors: M L C
authors: ML
authors: Vieira
authors: B
authors: B
authors: Rollim
authors: L
authors: L
authors: Fujita
authors: S
authors: S
authors: Tufik
authors: D
authors: D
authors: Poyares
mesh_terms: D000328:Adult; D000368:Aged; D002306:Cardiac Volume / Q000502:physiology; D045422:Continuous Positive Airway Pressure; D004311:Double-Blind Method; D019560:Echocardiography, Three-Dimensional; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D020181:Sleep Apnea, Obstructive / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000628:therapy*; D016896:Treatment Outcome