How does moving a spontaneously breathing person from a horizontal supine position to the prone or lateral decubitus position influence the FRC?
A. The FRC increases from 15% to 20%.
B. The FRC increases from 30% to 50%.
C. The FRC decreases from 20% to 15%.
D. The FRC decreases from 50% to 30%.
?ANS: A
A. Correct response: In spontaneously breathing patients, moving from the horizontal supine position to the prone or lateral decubitus position increases the FRC by 15% to 20%.
B. Incorrect response: See explanation A.
C. Incorrect response: See explanation A.
D. Incorrect response: See explanation A.
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