In which of the following situations is obtaining a chest radiograph least useful?
a. Following intubation
b. Following placement of a central venous pressure line
c. When the static pressure drops by 2 cm H2O during CMV
d. When the patient's oxygenation status deteriorates for no known reason
ANS: C
The respiratory therapist needs to be familiar with the common clinical indications for obtaining a chest radiograph (Table 21-1).
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