Upper airway inflammatory diseases and bronchial hyperresponsiveness.

Area of Science:

• Immunology
• Pulmonology
• Allergology

Background:

• Inflammatory conditions affecting the upper airway can influence lower airway function.
• Allergic rhinitis is recognized as a risk factor for developing asthma.
• Viral upper respiratory tract infections can lead to temporary bronchial hyperresponsiveness in healthy individuals.

Purpose of the Study:

• To explore the connection between upper airway inflammation and lower airway hyperresponsiveness.
• To investigate the role of upper airway conditions in the pathogenesis of asthma.

Main Methods:

• Review of existing literature and clinical observations.
• Analysis of the impact of allergic rhinitis on bronchial responsiveness.
• Examination of the effects of viral infections on airway reactivity.

Main Results:

• Allergic rhinitis is associated with bronchial hyperresponsiveness, potentially indicating undiagnosed asthma or IgE-mediated lower airway inflammation.
• Viral infections can induce airway hyperresponsiveness for months post-infection, affecting both healthy individuals and those with asthma.
• Inflammation primarily in the upper airway appears to play a role in the development of lower respiratory tract hyperresponsiveness and asthma.

Conclusions:

• Upper airway inflammation is a significant factor in the development of lower airway hyperresponsiveness.
• Conditions like allergic rhinitis and viral infections underscore the interconnectedness of upper and lower airway diseases.
• These findings suggest that managing upper airway inflammation may be crucial for preventing or managing asthma.