Mock NCLEX RN Exam Practice Question
The physician has ordered intubation and mechanical ventilation for a client with periods of apnea following a closed head injury. Arterial blood gases reveal a pH of 7.47, PCO2 of 28, and HCO3 of 23. These findings indicate that the client has:
Correct Answer: B
Rationale: A pH of 7.47 (alkaline) with low PCO2 (28) indicates respiratory alkalosis, likely from hyperventilation due to brain injury. Normal HCO3 rules out metabolic causes.
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