Field Internship Student Data Acquisition Project. (FISDAP) Airway Practice Exam

What is the typical ratio of inspiratory to expiratory phase for bronchial lung sounds?

1. 1:1

2. 1:2

3. 2:1

4. 2:2

The correct answer is: 1:2

Bronchial lung sounds are characterized by a distinct pattern that reflects the normal airflow in the larger airways, primarily produced during normal respiratory function. The typical inspiratory to expiratory phase ratio for bronchial lung sounds is 1:2, meaning that the expiratory phase is longer than the inspiratory phase. This ratio reflects the physical dynamics of breathing, where expiration is generally longer due to the elastic recoil of the lungs and the difficulty the air encounters as it moves out through the bronchi. The longer expiratory phase allows for adequate time to clear air out of the lungs after inhalation, facilitating efficient gas exchange. Understanding the normal pattern of bronchial sounds is crucial for healthcare professionals as abnormalities in these phases could indicate potential respiratory issues or conditions affecting airflow, illustrating the importance of this specific ratio for diagnostic purposes.