An experimental investigation to model wheezing in lungs

Area of Science:

• Physics of Fluids
• Bioengineering
• Respiratory Physiology

Background:

• Wheezing affects a quarter of the global population and has been historically used for lung diagnosis.
• The physical mechanisms driving wheezing onset and quantitative prediction models are currently lacking.
• Understanding airway oscillations is crucial for diagnosing and treating respiratory diseases.

Purpose of the Study:

• To elucidate the physical mechanisms underlying wheezing.
• To develop a quantitative model for predicting wheezing onset.
• To establish a predictive tool for improved lung disease diagnosis and treatment.

Main Methods:

• Modeling lung airways as a modified Starling resistor with airflow through elastic tubes.
• Conducting systematic experiments to determine a generalized 'tube law' relating tube area to transmural pressure.
• Developing a flutter-like instability model for wheezing based on experimental findings.

Main Results:

• A generalized 'tube law' was identified, describing airway cross-sectional area changes under transmural pressure.
• The necessary conditions for the onset of airway oscillations (wheezing) were determined.
• A novel flutter-like instability model for wheezing was proposed.

Conclusions:

• The study provides a quantitative framework for understanding and predicting wheezing.
• The developed model offers a potential tool for enhanced diagnosis and treatment of lung diseases.
• This research bridges the gap between the physics of airway mechanics and clinical respiratory diagnostics.