For patients with respiratory insufficiency, pressure-supported ventilation (PSV) has all of the following advantages over spontaneous breathing except:
a. decreased respiratory rate.
b. increased VT.
c. decreased O2 consumption.
d. increased muscle activity.
ANS: D
Clinical studies have shown that compared with spontaneous breathing (including that occurring during synchronized intermittent mandatory ventilation), PSV can result in a decreased respira-tory rate, increased tidal volume, reduced respiratory muscle activity, and decreased oxygen consumption.
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