Which of the following statements best describes how chronic obstructive pulmonary disease affects the mechanics of the chest wall?
a. The elastic recoil properties of the chest wall decrease.
b. The resting position of the chest wall remains unchanged.
c. The chest wall becomes concave.
d. There is an increased zone of apposition.
ANS: A
Due to the disease process, the elasticity of the chest wall decreases. More air is now housed in the
lungs and cannot escape. Due to this hyperinflation, a more barreled shape is seen in the chest.
Hyperinflation also changes the resting position of the diaphragm. The angles of the diaphragm
fibers become more horizontal with a decreased zone of apposition and decreased strength and
range of contraction.
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