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Related Experiment Videos

Airway inflammation in thunderstorm asthma.

P A B Wark1, J Simpson, M J Hensley

  • 1Respiratory Cell and Molecular Biology Research Division, Southampton General Hospital, Southampton, UK.

Clinical and Experimental Allergy : Journal of the British Society for Allergy and Clinical Immunology
|March 26, 2003
PubMed
Summary

Thunderstorm asthma involves airway inflammation with increased sputum eosinophils and eosinophil degranulation, suggesting allergen exposure as the cause. This research characterizes airway inflammation during these acute asthma episodes.

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Area of Science:

  • Allergy and Immunology
  • Respiratory Medicine
  • Environmental Health

Background:

  • Epidemic thunderstorm asthma events occur globally, but the underlying airway inflammation remains poorly understood.
  • Characterizing airway inflammation is crucial for understanding and managing these acute asthma exacerbations.

Purpose of the Study:

  • To characterize airway inflammation in patients experiencing thunderstorm-induced asthma.
  • To compare airway inflammation markers between thunderstorm asthma cases and control groups.

Main Methods:

  • Recruited 6 patients with acute asthma post-thunderstorm, comparing them to 12 atopic asthmatics and 6 corticosteroid-naive asthmatics.
  • Conducted spirometry, sputum induction, and allergy skin tests acutely and at 4-week follow-up.
  • Analyzed sputum for eosinophil counts, eosinophil cationic protein (ECP), and interleukin-5 (IL-5) positive cells.

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Main Results:

  • Thunderstorm asthma cases showed significantly higher sputum eosinophils (14.8%) and ECP levels compared to controls.
  • Elevated IL-5 positive cells (30%) were observed in thunderstorm asthma cases, indicating an inflammatory response.
  • Adjusted analysis revealed a 2.4-fold increased risk of elevated sputum eosinophils in thunderstorm asthma cases, even considering inhaled corticosteroid (ICS) use.

Conclusions:

  • Thunderstorm asthma is characterized by significant airway inflammation, specifically IL-5-mediated sputum eosinophilia and eosinophil degranulation.
  • Findings support allergen exposure, likely from a grass pollen deluge during thunderstorms, as the primary cause of these epidemic asthma events.
  • The study provides insights into the inflammatory mechanisms driving severe asthma exacerbations triggered by environmental factors.