A study on the reproducibility of specific bronchial provocation testing in children

Area of Science:

• Pediatric Allergy and Immunology
• Respiratory Medicine
• Clinical Immunology

Background:

• Childhood asthma diagnosis often relies on bronchial provocation tests.
• Housedust allergen is a common trigger for allergic asthma in children.
• Assessing the reliability of these tests is crucial for accurate diagnosis and management.

Purpose of the Study:

• To evaluate the reproducibility of housedust bronchial provocation tests in asthmatic children.
• To determine the influence of allergen dose and inhaled volume on test reliability.
• To identify factors affecting the consistency of bronchial responses.

Main Methods:

• Thirty-five children (aged 4-13) with asthma underwent housedust bronchial provocation tests twice.
• Two allergen doses (1200 and 3600 micrograms) were administered.
• Reproducibility was assessed based on consistent bronchial responses across repeated tests.

Main Results:

• Eighty percent of the seventy tests showed reproducibility, confirming test reliability.
• Reproducibility was significantly better with lower inhaled allergen doses.
• Bronchial response intensity varied within subjects, especially with increased inhaled volumes.
• Combined immediate and delayed, or delayed-only reactions occurred frequently (60%).

Conclusions:

• Housedust bronchial provocation tests are reliable for diagnosing childhood asthma, particularly at lower allergen doses.
• Variations in response intensity and inhaled volume impact test reproducibility.
• The frequent occurrence of delayed reactions necessitates their consideration in test interpretation.