title: Noninvasive ventilation and survival in acute care settings: a comprehensive systematic review and metaanalysis of randomized controlled trials.
abstract: OBJECTIVE
  Noninvasive ventilation is increasingly applied to prevent or treat acute respiratory failure, but its benefit on survival is still controversial for many indications. We performed a metaanalysis of randomized controlled trials focused on the effect of noninvasive ventilation on mortality.
  
  
  METHODS
  BioMedCentral, PubMed, Embase, and the Cochrane Central Register of clinical trials (updated December 31, 2013) were searched.
  
  
  METHODS
  We included all the randomized controlled trials published in the last 20 years performed in adults, reporting mortality, comparing noninvasive ventilation to any other treatment for prevention or treatment of acute respiratory failure or as a tool allowing an earlier extubation. Studies with unclear methodology, comparing two noninvasive ventilation modalities, or in palliative settings were excluded.
  
  
  METHODS
  We extracted data on mortality, study design, population, clinical setting, comparator, and follow-up duration.
  
  
  RESULTS
  Seventy-eight studies were analyzed. Noninvasive ventilation was associated with a reduction in mortality (12.6% in the noninvasive ventilation group vs 17.8% in the control arm; risk ratio=0.73 [0.66-0.81]; p<0.001; number needed to treat=19 with 7,365 patients included) at the longest available follow-up. Mortality was reduced when noninvasive ventilation was used to treat (14.2% vs 20.6%; risk ratio=0.72; p<0.001; number needed to treat=16, with survival improved in pulmonary edema, chronic obstructive pulmonary disease exacerbation, acute respiratory failure of mixed etiologies, and postoperative acute respiratory failure) or to prevent acute respiratory failure (5.3% vs 8.3%; risk ratio=0.64 [0.46-0.90]; number needed to treat=34, with survival improved in postextubation ICU patients), but not when used to facilitate an earlier extubation. Overall results were confirmed for hospital mortality. Patients randomized to noninvasive ventilation maintained the survival benefit even in studies allowing crossover of controls to noninvasive ventilation as rescue treatment.
  
  
  CONCLUSIONS
  This comprehensive metaanalysis suggests that noninvasive ventilation improves survival in acute care settings. The benefit could be lost in some subgroups of patients if noninvasive ventilation is applied late as a rescue treatment. Whenever noninvasive ventilation is indicated, an early adoption should be promoted.
authors.affiliation: Department of Anesthesia and Intensive Care, IRCCS San Raffaele Hospital, Vita-Salute University, Milan, Italy.
authors.forename: Luca
authors.initials: L
authors.lastname: Cabrini
authors.forename: Giovanni
authors.initials: G
authors.lastname: Landoni
authors.forename: Alessandro
authors.initials: A
authors.lastname: Oriani
authors.forename: Valentina P
authors.initials: VP
authors.lastname: Plumari
authors.forename: Leda
authors.initials: L
authors.lastname: Nobile
authors.forename: Massimiliano
authors.initials: M
authors.lastname: Greco
authors.forename: Laura
authors.initials: L
authors.lastname: Pasin
authors.forename: Luigi
authors.initials: L
authors.lastname: Beretta
authors.forename: Alberto
authors.initials: A
authors.lastname: Zangrillo
mesh_terms: D000208:Acute Disease; D000328:Adult; D006801:Humans; D008173:Lung Diseases, Obstructive / Q000628:therapy; D063087:Noninvasive Ventilation; D016032:Randomized Controlled Trials as Topic; D012131:Respiratory Insufficiency / Q000401:mortality* / Q000628:therapy*