Wheezing is most commonly heard on which part of the respiratory cycle?

Wheezing is most commonly heard on which part of the respiratory cycle?

• A. Inspiration
• B. Expiration
• C. Both inspiration and expiration
• D. During rest

Answer: (B)

Wheezing is most commonly heard during expiration due to the pathophysiology of airway constriction. In cases such as asthma or chronic obstructive pulmonary disease (COPD), the airway narrows, leading to turbulence as the air flows out of the lungs. This turbulent air movement creates a high-pitched, musical sound known as wheezing. During expiration, the increased resistance to airflow results in more pronounced wheezing, as the narrowing of the airways is exacerbated with the effort of pushing air out of the lungs. While wheezing can occur in both phases of the respiratory cycle, it is more commonly associated with expiration because the airway constriction prevents smooth airflow more significantly in that phase compared to inspiration. This distinguishes it from other respiratory sounds which may be more even across both phases.

Wheezing is most commonly heard during expiration due to the pathophysiology of airway constriction. In cases such as asthma or chronic obstructive pulmonary disease (COPD), the airway narrows, leading to turbulence as the air flows out of the lungs. This turbulent air movement creates a high-pitched, musical sound known as wheezing.

During expiration, the increased resistance to airflow results in more pronounced wheezing, as the narrowing of the airways is exacerbated with the effort of pushing air out of the lungs. While wheezing can occur in both phases of the respiratory cycle, it is more commonly associated with expiration because the airway constriction prevents smooth airflow more significantly in that phase compared to inspiration. This distinguishes it from other respiratory sounds which may be more even across both phases.