What pitfall or drawback occurs when placing a mechanically ventilated patient in a lateral decubitus position with the healthy lung in the dependent position? I. increasing dead space in the nondependent lung II. causing more perfusion to enter the nondependent lung III. causing shunting in the dependent lung IV. inducing hemidiaphragmatic fatigue of the nondependent portion of the diaphragm
A. I only
B. I, II only
C. I, III only
D. III, IV only
?ANS: C
A. Incorrect response: See explanation C.
B. Incorrect response: See explanation C.
C. Correct response: When patients are positioned with the "good lung down" (healthy lung down), the greater perfusion in the dependent lung may cause shunting in the dependent lung. Similarly, increased alveolar dead space may arise in the nondependent lung, which would be receiving more ventilation and less perfusion.
D. Incorrect response: See explanation C.
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