Which of the following are advantages of using transtracheal
oxygen (TTO) therapy catheters?
I. They do not require periodic replacement.
II. The incidence of infection is considerably lower than
with other low-flow oxygen devices.
III. They require lower oxygen flows to achieve a given FIO2
than do standard nasal cannulas.
IV. They are less obtrusive (i.e., more cosmetically
pleasing) than nasal cannulas.
a. 1 and 3 only
b. 2 and 3 only
c. 3 and 4 only
d. 2, 3, and 4 only
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