Retractions of the intercostal spaces generally occur

a. upon inspiration. c. while coughing.
b. upon expiration. d. throughout the respiratory cycle.


A
Retractions occur when the muscles between the ribs pull in during inspiration. The presence of retractions is abnormal and usually occurs during inspiration. Conditions that obstruct the free inflow of air can lead to retractions. These include emphysema, asthma, tracheal or laryngeal obstruction, and the presence of a foreign body or tumor that compresses the respiratory tract. Bulging of the intercostal spaces is also abnormal and occurs during expiration.

Nursing

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