A decrease in forced expiratory volume in 1 second (FEV1) and vital capacity (VC) of greater than 20% when a patient moves from the seated to the supine position is suggestive of which of the following?
a. Diaphragmatic muscle weakness
b. Scalene muscle weakness
c. Brainstem injury
d. Internal intercostal weakness
ANS: A
A decrease in FEV1 and VC of greater than 20% when a patient moves from the seated to the supine position suggests diaphragmatic muscle weakness.
Health Professions
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