Which of the following lab values would the nurse expect in a patient who has sustained trauma to the lungs and chest wall and is experiencing respiratory failure?
a. Electrolyte imbalances
b. Elevated PaCO2
c. Low hematocrit
d. Elevated pH
ANS: B
In respiratory failure, inadequate gas exchange occurs such that PaO2 ≤ 60 mm Hg or PaCO2 ≥ 50 mm Hg with pH ≤ 7.25. Electrolyte imbalances do not occur, but changes in blood gas values do. Hematocrit may be unaffected. pH will be decreased.
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