PN NCLEX Practice Exam Related

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A nurse is caring for an elderly client who had a colectomy for removal of cancer 2 days ago. The client is becoming increasingly restless and has been given IV morphine every 2 hours for severe pain. Respirations are 28/min and shallow. Which arterial blood gas results best indicate that the client is in acute respiratory failure and needs immediate intervention?

  • A. PaO2 49 mm Hg (6.5 kPa), PaCO2 60 mm Hg (8.0 kPa)
  • B. PaO2 64 mm Hg (8.5 kPa), PaCO2 45 mm Hg (6.0 kPa)
  • C. PaO2 70 mm Hg (9.3 kPa), PaCO2 30 mm Hg (4.0 kPa)
  • D. PaO2 86 mm Hg (11.5 kPa), PaCO2 25 mm Hg (3.33 kPa)
Correct Answer: A

Rationale: PaO2 < 50 mm Hg and PaCO2 > 50 mm Hg (A) indicate acute respiratory failure, requiring immediate intervention. Other options show less severe hypoxemia or normal values.