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Effect of nitric oxide on oxygenation and mortality in acute lung injury: systematic review and meta-analysis

BMJ 2007; 334 doi: https://doi.org/10.1136/bmj.39139.716794.55 (Published 12 April 2007) Cite this as: BMJ 2007;334:779
  1. Neill K J Adhikari, lecturer1,
  2. Karen E A Burns, assistant professor1,
  3. Jan O Friedrich, assistant professor1,
  4. John T Granton, associate professor1,
  5. Deborah J Cook, professor2,
  6. Maureen O Meade, associate professor2
  1. 1Interdepartmental Division of Critical Care Medicine, University of Toronto, Toronto, Canada
  2. 2Departments of Medicine and Clinical Epidemiology and Biostatistics, McMaster University, Hamilton, Canada
  1. Correspondence to: N K J Adhikari neill.adhikari{at}sunnybrook.ca
  • Accepted 23 January 2007

Abstract

Objective To review the literature on the use of inhaled nitric oxide to treat acute lung injury/acute respiratory distress syndrome (ALI/ARDS) and to summarise the effects of nitric oxide, compared with placebo or usual care without nitric oxide, in adults and children with ALI or ARDS.

Design Systematic review and meta-analysis.

Data sources Medline, CINAHL, Embase, and CENTRAL (to October 2006), proceedings from four conferences, and additional information from authors of 10 trials.

Review methods Two reviewers independently selected parallel group randomised controlled trials comparing nitric oxide with control and extracted data related to study methods, clinical and physiological outcomes, and adverse events.

Main outcome measures Mortality, duration of ventilation, oxygenation, pulmonary arterial pressure, adverse events.

Results 12 trials randomly assigning 1237 patients met inclusion criteria. Overall methodological quality was good. Using random effects models, we found no significant effect of nitric oxide on hospital mortality (risk ratio 1.10, 95% confidence interval 0.94 to 1.30), duration of ventilation, or ventilator-free days. On day one of treatment, nitric oxide increased the ratio of partial pressure of oxygen to fraction of inspired oxygen (PaO2/FiO2 ratio) (13%, 4% to 23%) and decreased the oxygenation index (14%, 2% to 25%). Some evidence suggested that improvements in oxygenation persisted until day four. There was no effect on mean pulmonary arterial pressure. Patients receiving nitric oxide had an increased risk of developing renal dysfunction (1.50, 1.11 to 2.02).

Conclusions Nitric oxide is associated with limited improvement in oxygenation in patients with ALI or ARDS but confers no mortality benefit and may cause harm. We do not recommend its routine use in these severely ill patients.

Footnotes

  • We thank Phil Dellinger, Emily Dobyns, Herwig Gerlach, and Sangeeta Mehta for providing additional information about their trials; Pascal Beuret, Gilbert Blaise, Ronald Day, Stefan Lundin, Kwang Joo Park, Didier Payen, and Benoît Vallet for providing additional outcomes data; Natasha Stankovic for assistance in translation; and Jim Julian for constructive comments on an earlier draft of the manuscript.

  • Contributors: NKJA conceived and designed the study, acquired data, analysed and interpreted data, and drafted the manuscript. KEAB contributed to study design and acquired and interpreted data. JOF acquired and interpreted data. JTG interpreted data. DJC and MOM contributed to study design and interpreted data. All authors revised the manuscript for important intellectual content and approved the final version. NKJA is guarantor.

  • Funding: None.

  • Competing interests: None declared.

  • Ethical approval: Not required.

  • Accepted 23 January 2007
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