Coarse crackles are characterized by crackling or gurgling sounds that
a. occur during both inspiration and expiration.
b. mimic the sound caused by rolling hair with your fingers near your ear.
c. cannot be cleared by coughing.
d. result from air passing through moisture in large airways that reinflate.
D
Coarse crackles are caused by air passing through moisture in large airways that suddenly reinflate. This is usually heard in patients with pneumonia, pulmonary edema, bronchitis, and atelectasis. A pleural friction rub can be heard both on inspiration and expiration. Fine crackles mimic the sound caused by rolling hair with your fingers near your ear. Fine crackles and stridor cannot be cleared by coughing.
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