Changes in lung sounds during asthma progression in a guinea pig model

Area of Science:

• Respiratory Medicine
• Pulmonology
• Medical Acoustics

Background:

• Objective lung sound analysis aids in evaluating airways, even in asymptomatic asthma.
• The link between lung sounds and airway morphology in asthma progression remains unclear.
• This study investigates chronic airway changes and lung sounds during asthma development.

Purpose of the Study:

• To explore the relationship between lung sounds and airway wall remodeling in an asthma model.
• To determine if lung sound characteristics can indicate specific airway morphological changes.

Main Methods:

• An asthma model was created in guinea pigs using albumin sensitization and challenge.
• Lung sounds, lung function, and airway histology were assessed over 21 weeks.
• Airway wall thickness and internal area ratios were measured in trachea, bronchi, and bronchioles.

Main Results:

• Inspiratory sound intensity showed the most significant difference between asthma models and controls.
• Peripheral airway wall thickness was greater in asthma models.
• Inspiratory sound intensity in the 501-1000 Hz range strongly correlated with peripheral airway wall thickness (r=0.76).

Conclusions:

• Lung sound intensity in the 501-1000 Hz frequency range is associated with peripheral airway wall thickness.
• Inspiratory sound intensity serves as a potential non-invasive marker for airway remodeling in asthma.