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Related Experiment Videos

Comparative study of two methods for spinhaler-specific bronchoprovocation challenges. II.

A L Boner, G Vallone, M Nardi

    Annals of Allergy
    |November 1, 1986
    PubMed
    Summary

    Two methods for house dust mite bronchial challenge tests in children with asthma were compared. The Cumulative Dose Method (CDM) provided faster results, while the Daily Increasing Dose Method (DIDM) used lower daily doses.

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    Area of Science:

    • Allergy and Immunology
    • Pediatric Pulmonology
    • Respiratory Medicine

    Background:

    • Chronic asthma in children often involves sensitization to house dust mites.
    • Accurate bronchial challenge testing is crucial for diagnosing and managing allergic asthma.
    • Standardized methods for allergen-induced bronchial provocation are needed.

    Purpose of the Study:

    • To evaluate two distinct methods for specific bronchial challenge testing in children with asthma.
    • To compare the efficacy and outcomes of the Cumulative Dose Method (CDM) and Daily Increasing Dose Method (DIDM) for house dust mite allergen.
    • To assess the impact of these challenge methods on non-specific bronchial reactivity.

    Main Methods:

    • Eleven children with chronic asthma and house dust mite allergy underwent bronchial challenge using a micronized D. pteronyssinus extract.

    Related Experiment Videos

  • Cumulative Dose Method (CDM): Serial antigen doses administered at 30-minute intervals.
  • Daily Increasing Dose Method (DIDM): Single, incrementally increasing daily antigen doses.
  • Challenge positivity defined by a >20% drop in Forced Expiratory Volume in 1 second (FEV1).

    • Main Results:

    • Both CDM and DIDM induced significant early and late falls in FEV1.
    • CDM resulted in a greater early FEV1 fall (36.6%) compared to DIDM (29.1%).
    • Late FEV1 falls were also more pronounced with CDM (52%) versus DIDM (35.3%).
    • Both methods led to increased non-specific bronchial reactivity post-challenge.

    Conclusions:

    • The Cumulative Dose Method (CDM) allows for quicker assessment of bronchial challenge responses.
    • The Daily Increasing Dose Method (DIDM) offers the benefit of lower daily allergen exposure.
    • Modifications to the CDM, such as shorter administration intervals, may further enhance its utility.