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Related Experiment Videos

Ionisers for chronic asthma.

K Blackhall1, S Appleton, C J Cates

  • 1Cochrane Airways Group, Department of Community Health Sciences, St George's Hospital Medical School, London, Tooting, UK, SW17 ORE.

The Cochrane Database of Systematic Reviews
|August 15, 2003
PubMed
Summary
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Air ionizers do not significantly improve asthma symptoms or lung function. This systematic review found no evidence to recommend air ionizers for managing chronic asthma. Further research is needed.

Area of Science:

  • Environmental Health
  • Respiratory Medicine
  • Clinical Trials

Background:

  • Air ion content may influence respiratory function, but evidence on air ionizers for asthma is inconclusive.
  • The use of air ionizers as an asthma treatment remains debated.

Purpose of the Study:

  • To systematically review evidence on the effectiveness of positive and negative air ion generators for individuals with asthma.

Main Methods:

  • Searched multiple databases including Cochrane Airways Group Asthma trials register and AMED.
  • Included randomized controlled trials (RCTs) comparing ionizers with dummy devices in adults and children with chronic asthma.
  • Assessed study quality using Cochrane's allocation concealment and the Jadad scale.

Main Results:

Related Experiment Videos

  • Six crossover studies with 106 participants were included.
  • No significant differences in lung function (PEF, FEV1) or asthma symptoms were found with negative ion generators.
  • Positive ion generators showed no statistically significant impact on lung function, despite a trend towards decreased FEV1 with exercise.

Conclusions:

  • Current randomized controlled trial evidence does not support recommending room air ionizers for reducing symptoms in chronic asthma patients.
  • A definitive recommendation for air ionizer use in asthma management cannot be made based on available data.