What is the alleged benefit of using heliox mixtures to ventilate patients who have severe airway obstruction?
A. A lower tidal volume is generally needed.
B. The adverse effects of applied PEEP tend to be less.
C. Lung emptying is sometimes facilitated.
D. Ventilators often operate better when heliox mixtures are used as the source gas.
ANS: C
A. Incorrect response: See explanation C.
B. Incorrect response: See explanation C.
C. Correct response: In severe airway obstruction, uses of heliox, which is a low density gas mixture, usually in the helium:oxygen proportions of 80:20, 70:30, and 60:40. Heliox purportedly helps reduce patient inspiratory work and facilitates lung emptying. If a helium-gas mixture is used, recall that many flow sensors must be recalibrated to account for the change in gas density. Some ventilators actually cannot function in the presence of heliox.
D. Incorrect response: See explanation C
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A. I, IV only B. II, III only C. I, II, IV only D. I, II, III, IV
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