Bronchial hyperresponsiveness, atopy, airway inflammation, and asthma

Area of Science:

• Pulmonology
• Allergy and Immunology
• Pathophysiology

Background:

• Airway inflammation, often with eosinophil infiltration, is a hallmark of asthma, though not exclusive to it.
• Atopy (allergic sensitization) is a significant risk factor for asthma development and persistence.
• Bronchial hyperresponsiveness (BHR) and atopy are common in asthma patients but not universal.

Purpose of the Study:

• To explore the relationship between airway inflammation, bronchial hyperresponsiveness, and atopy in asthma.
• To emphasize the early onset of airway inflammation in asthma's natural history.
• To highlight the need for early intervention strategies to potentially alter asthma's course.

Main Methods:

• Review of existing studies on asthma, airway inflammation, BHR, and atopy.
• Analysis of the correlation between allergen-induced responses, BHR, and inflammation.
• Examination of the role of atopy as a risk factor.

Main Results:

• Airway inflammation, particularly eosinophilic, is a near-constant feature in asthma.
• Allergen-induced late asthmatic responses can elevate non-specific hyperresponsiveness.
• Bronchial responsiveness correlates with the degree of airway inflammation.

Conclusions:

• Atopy is a critical factor in asthma development and its persistence.
• Airway inflammation emerges early in asthma's natural progression.
• Current treatments for established asthma do not offer a cure or modify its long-term course, necessitating research into early intervention.