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Journal Article
Meta-Analysis
Research Support, Non-U.S. Gov't
Effect of noninvasive positive pressure ventilation on mortality in patients admitted with acute respiratory failure: a meta-analysis.
Critical Care Medicine 1997 October
OBJECTIVE: To critically appraise and summarize the trials examining the addition of noninvasive positive pressure ventilation to standard therapy on hospital mortality and need for endotracheal intubation in patients admitted with acute respiratory failure.
DATA SOURCES: We searched MEDLINE (1966 to September 1995) and key references were searched forward using the Scientific Citation Index (SCISEARCH). Bibliographies of all selected articles and review articles were examined. Authors of all selected and review articles were contacted by letter to identify unpublished work.
STUDY SELECTION: a)
POPULATION: patients with acute respiratory failure; b) intervention: noninvasive positive pressure ventilation; c) outcome: mortality and/or endotracheal intubation; and d) design: randomized, controlled study. Two of us independently selected the articles for inclusion; disagreements were settled by consensus. Seven (three unpublished) of 212 initially identified studies were selected.
DATA EXTRACTION: Two authors independently extracted data and evaluated methodologic quality of the studies.
DATA SYNTHESIS: Noninvasive positive pressure ventilation was associated with decreased mortality (odds ratio = 0.29; 95% confidence interval 0.15 to 0.59) and a decreased need for endotracheal intubation (odds ratio = 0.20; 95% confidence interval 0.11 to 0.36). Sensitivity analysis suggested a greater benefit of noninvasive positive pressure ventilation in patients with chronic obstructive pulmonary disease (COPD). The inclusion/exclusion of unpublished trials did not influence these results.
CONCLUSIONS: The addition of noninvasive positive pressure ventilation to standard therapy in patients with acute respiratory failure improves survival and decreases the need for endotracheal intubation. However, this effect is restricted to patients whose cause of acute respiratory failure is an exacerbation of COPD. Further research is warranted to determine whether noninvasive positive pressure ventilation confers benefit in patients without COPD who have acute respiratory failure.
DATA SOURCES: We searched MEDLINE (1966 to September 1995) and key references were searched forward using the Scientific Citation Index (SCISEARCH). Bibliographies of all selected articles and review articles were examined. Authors of all selected and review articles were contacted by letter to identify unpublished work.
STUDY SELECTION: a)
POPULATION: patients with acute respiratory failure; b) intervention: noninvasive positive pressure ventilation; c) outcome: mortality and/or endotracheal intubation; and d) design: randomized, controlled study. Two of us independently selected the articles for inclusion; disagreements were settled by consensus. Seven (three unpublished) of 212 initially identified studies were selected.
DATA EXTRACTION: Two authors independently extracted data and evaluated methodologic quality of the studies.
DATA SYNTHESIS: Noninvasive positive pressure ventilation was associated with decreased mortality (odds ratio = 0.29; 95% confidence interval 0.15 to 0.59) and a decreased need for endotracheal intubation (odds ratio = 0.20; 95% confidence interval 0.11 to 0.36). Sensitivity analysis suggested a greater benefit of noninvasive positive pressure ventilation in patients with chronic obstructive pulmonary disease (COPD). The inclusion/exclusion of unpublished trials did not influence these results.
CONCLUSIONS: The addition of noninvasive positive pressure ventilation to standard therapy in patients with acute respiratory failure improves survival and decreases the need for endotracheal intubation. However, this effect is restricted to patients whose cause of acute respiratory failure is an exacerbation of COPD. Further research is warranted to determine whether noninvasive positive pressure ventilation confers benefit in patients without COPD who have acute respiratory failure.
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