title: Factors predicting survival following noninvasive ventilation in amyotrophic lateral sclerosis.
abstract: OBJECTIVE
  The involvement of respiratory muscles is a major predicting factor for survival in amyotrophic lateral sclerosis (ALS). Recent studies show that noninvasive ventilation (NIV) can relieve symptoms of alveolar hypoventilation. However, factors predicting survival in ALS patients when treated with NIV need to be clarified.
  
  
  METHODS
  We conducted a retrospective study of 33 consecutive ALS patients receiving NIV. Ten patients had bulbar onset. We determined the median survivals from onset, diagnosis and initiation of NIV and factors predicting survival. Statistical analysis was performed using the Kaplan-Meier test and Cox proportional hazard models.
  
  
  RESULTS
  The median initial and maximal total uses of NIV were 10 and 14 h/24h. The overall median survival from ALS onset was 34.2 months and worsened with increasing age and bulbar onset of the disease. The median survival from initiation of NIV was 8.4 months and was significantly poorer in patients with advanced age or with airway mucus accumulation. Survival from initiation of NIV was not influenced by respiratory parameters or bulbar symptoms.
  
  
  CONCLUSIONS
  Advanced age at diagnosis and airway mucus accumulation represent poorer prognostic factors of ALS patients treated with NIV. NIV is a helpful treatment of sleep-disordered breathing, including patients with bulbar involvement.
authors.affiliation: Faculté de Médecine Lyon Sud, Université Lyon 1, et Centre SLA, Hôpital Neurologique et Neurochirurgical, Hospices Civils de Lyon, Lyon, France. stephane.peysson@chu-lyon.fr
authors.forename: S
authors.initials: S
authors.lastname: Peysson
authors.forename: N
authors.initials: N
authors.lastname: Vandenberghe
authors.forename: F
authors.initials: F
authors.lastname: Philit
authors.forename: C
authors.initials: C
authors.lastname: Vial
authors.forename: T
authors.initials: T
authors.lastname: Petitjean
authors.forename: F
authors.initials: F
authors.lastname: Bouhour
authors.forename: J Y
authors.initials: JY
authors.lastname: Bayle
authors.forename: E
authors.initials: E
authors.lastname: Broussolle
mesh_terms: D000368:Aged; D000690:Amyotrophic Lateral Sclerosis / Q000175:diagnosis / Q000401:mortality* / Q000628:therapy*; D016001:Confidence Intervals; D045422:Continuous Positive Airway Pressure; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D016017:Odds Ratio; D011237:Predictive Value of Tests; D011379:Prognosis; D012121:Respiration, Artificial / Q000379:methods*; D012189:Retrospective Studies; D016019:Survival Analysis; D013997:Time Factors