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Does forced air heating exacerbate asthma?

R E Dales1, M Fyfe, I Schweitzer

  • 1Department of Medicine, University of Ottawa, Ontario, Canada.

The Journal of Allergy and Clinical Immunology
|November 1, 1992
PubMed
Summary
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Forced air heating does not worsen asthma symptoms or lung function in most individuals. This study found no significant difference in asthma control when home heating systems were activated in autumn.

Area of Science:

  • Environmental Health
  • Respiratory Medicine
  • Clinical Trials

Background:

  • Asthma morbidity often increases in autumn, coinciding with the initiation of home heating in Canada.
  • Forced air heating systems are suspected by some to exacerbate asthma symptoms.

Purpose of the Study:

  • To investigate the hypothesis that forced air heating exacerbates asthma.
  • To determine the impact of forced air heating on asthma control metrics.

Main Methods:

  • A randomized controlled trial involving 51 asthma patients.
  • Intervention group: Forced air heating off for 9 days, then used nightly for 8 days.
  • Control group: Forced air heating remained off throughout the study period. Asthma symptoms, bronchodilator use, and morning peak flows were recorded.

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Main Results:

  • No significant difference in nocturnal awakenings or breathing difficulties upon waking was observed in the intervention group when heating was on compared to off.
  • Mean morning peak flows showed no significant change in the intervention group (3.3% +/- 6.7% SEM, p = 0.6) with forced air heating.
  • The control group also showed no significant changes in asthma metrics, indicating stable asthma control during the study period.

Conclusions:

  • The commencement of forced air heating did not exacerbate asthma in the studied population.
  • Forced air heating is unlikely to be a significant problem for the majority of individuals with asthma.