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Measurement of airborne mite antigen in homes of asthmatic children

J A Price1, I Pollock, S A Little

  • 1Department of Paediatrics, National Heart and Lung Institute, Brompton Hospital, London, UK.

Lancet (London, England)
|October 13, 1990
PubMed

Insights

Airborne house dust mite antigen levels strongly correlate with allergic asthma sensitivity. Air sampling is more effective than carpet dust measurements for assessing exposure in asthmatic children.

Area of Science:

  • Allergy and Immunology
  • Environmental Health
  • Pediatric Respiratory Medicine

Background:

  • House dust mites are a common allergen triggering allergic diseases, particularly asthma in children.
  • Current methods for assessing exposure, like carpet dust sampling, may not accurately reflect actual patient exposure.
  • Understanding the relationship between mite antigen levels and sensitivity is crucial for effective asthma management.

Purpose of the Study:

  • To compare the effectiveness of airborne versus carpet dust sampling for measuring Der p1 antigen exposure.
  • To determine the association between house dust mite antigen levels and allergic sensitivity in asthmatic children.
  • To identify optimal methods for assessing mite antigen exposure in the homes of allergic asthmatic children.

Main Methods:

  • Low volume air sampling (2 L/min) was used to measure airborne Der p1 concentrations in 68 homes of allergic, asthmatic children.
  • Carpet dust samples were analyzed for Der p1 levels, with comparisons made to established and lower threshold levels (2 µg/g and 0.5 µg/g).
  • Associations between mite antigen levels (airborne and dust) and child sensitivity were statistically analyzed.

Main Results:

  • Detectable airborne Der p1 was strongly associated with mite sensitivity in children.
  • No significant relation was found between sensitivity and the previously recommended 2 µg/g carpet dust threshold.
  • A significant association was observed with lower carpet dust thresholds (0.5 µg/g), but air measurements showed a stronger correlation.
  • Higher airborne Der p1 concentrations were found in rooms with wool carpets compared to synthetic carpets or hard floors.

Conclusions:

  • Air sampling is a more appropriate and sensitive method for assessing house dust mite antigen exposure in asthmatic patients compared to carpet dust sampling.
  • Current carpet dust threshold recommendations may not be sufficiently accurate for assessing risk in sensitive individuals.
  • Findings support the use of air monitoring for a better understanding of mite-related asthma triggers.

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