Mucociliary function of chronic inflammation in upper and lower airways

Area of Science:

• Respiratory Medicine
• Immunology
• Otorhinolaryngology

Background:

• Chronic inflammation in upper and lower airways is common.
• The relationship between chronic sinusitis and chronic bronchitis requires further investigation.
• Mucociliary function plays a critical role in airway clearance.

Purpose of the Study:

• To investigate the association between chronic inflammation in the upper and lower airways.
• To examine mucociliary function, including mucociliary clearance (MCC), ciliary beat frequency (CBF), and dynamic viscoelasticity (DVE) of airway fluids.
• To compare these parameters in non-inflammatory subjects, patients with chronic sinusitis, patients with chronic bronchitis, and patients with both conditions.

Main Methods:

• Four subject groups were studied: control, chronic sinusitis (S), chronic bronchitis (B), and chronic sinusitis with bronchitis (SB).
• Mucociliary clearance (MCC) and ciliary beat frequency (CBF) were measured in the nose and left main bronchus.
• Dynamic viscoelasticity (DVE) of nasal and tracheobronchial mucus was assessed.

Main Results:

• Nasal MCC was prolonged in S and SB groups; bronchial MCC was diminished in B and SB groups compared to controls.
• Nasal and tracheobronchial mucus DVE was significantly higher in S, B, and SB groups than in the control group.
• CBF remained unchanged across all groups in both nasal and bronchial measurements.

Conclusions:

• Elevated viscoelasticity of tracheobronchial mucus in chronic sinusitis patients and nasal mucus in chronic bronchitis patients may contribute to sinobronchitis.
• Impaired mucociliary clearance, particularly in the bronchi of patients with chronic bronchitis, is associated with chronic airway inflammation.
• The study highlights the role of mucus properties in the pathophysiology of combined upper and lower airway inflammatory diseases.