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Effects of anti-mite measures on children with mite-sensitive asthma: a controlled trial
Abstract:
Mite counts and tests for mite antigen were performed on samples of dust taken from the bedding of 53 children with mite-sensitive asthma. The samples from damp houses and the beds or enuretic children had markedly more mites and mite-antigen than those from dry houses. although the predominant species was usually Dermatophagoides pteronyssinus, some of the beds in the damp houses were heavily infested with another pyroglyphid mite Euroglyphus maynei, so that this was the species found in the greatest numbers. D pteronyssinus antigen was found to be correlated broadly with the total mite count, but more antigen was present for a given number of mites in the mattresses than in the blankets. The children were randomly allocated into two groups, one of which carried out rigorous anti-mite measures. The amounts of dust and mite antigen were reduced, though not the numbers of mites. Peak flow readings were monitored in the two groups for eight weeks and a final assessment made by a paediatrician who was unaware of the allocation of each patient in the trial. No significant differences emerged in the progress of the two groups, both tending to improve. Measures designed to remove mites from bedding do not greatly benefit the majority of children with mite-sensitive asthma.
Insights
Rigorous anti-mite measures in bedding reduced dust and mite antigen but did not significantly improve symptoms in children with mite-sensitive asthma. Overall improvement was observed in both treated and control groups.
Area of Science:
- Allergy and Immunology
- Environmental Health
- Pediatrics
Background:
- Mite-sensitive asthma affects many children, with environmental factors like humidity and house dust mites playing a significant role.
- Damp housing conditions and enuresis are associated with higher mite and mite antigen levels in bedding.
- Dermatophagoides pteronyssinus and Euroglyphus maynei are common mite species found in children's bedding.
Purpose of the Study:
- To investigate the correlation between mite counts, mite antigen levels, and asthma severity in children.
- To evaluate the effectiveness of rigorous anti-mite measures in reducing mite exposure and improving asthma control in children.
- To assess the impact of environmental factors on mite infestation in children's bedding.
Main Methods:
- Dust samples from 53 children's bedding were analyzed for mite counts and mite antigen.
- Children were randomly assigned to either a control group or a group implementing strict anti-mite measures.
- Lung function (peak flow) was monitored for eight weeks, with final clinical assessment by an unaware pediatrician.
Main Results:
- Damp houses and beds of enuretic children showed significantly higher mite and mite antigen levels.
- Anti-mite measures reduced dust and mite antigen but not mite numbers.
- No significant difference in asthma progress or peak flow readings was observed between the intervention and control groups.
Conclusions:
- Rigorous anti-mite measures in bedding do not provide significant clinical benefits for the majority of children with mite-sensitive asthma.
- Environmental modifications may reduce mite allergen load but do not necessarily translate to improved asthma outcomes.
- Further research is needed to identify more effective interventions for mite-sensitive asthma.