Question

what is true regarding adventitious breath sounds? wheezing is due to laminar airflow. crackles are due to turbulent flow through the airways due to bronchoconstriction. crackles may clear with coughing. wheezing may be described as fine/dry or coarse/wet. atelectasis may present with wheezing.

Explanation:

1. Wheezing is due to turbulent airflow, not laminar airflow, so the first option is incorrect.
2. Crackles are caused by the sudden opening of collapsed small airways and alveoli, not by turbulent flow through the air - ways due to bronchoconstriction (which is more related to wheezing), so the second option is incorrect.
3. Crackles may clear with coughing as coughing can help to open up the airways and disperse the fluid or secretions causing the crackles, this is correct.
4. Crackles are described as fine/dry or coarse/wet, not wheezing, so the fourth option is incorrect.
5. Atelectasis typically presents with decreased or absent breath sounds rather than wheezing, so the fifth option is incorrect.

Answer:

C. Crackles may clear with coughing.