You're called to PACU for a 67-year-old male post-total knee arthroplasty on multimodal analgesia including morphine PCA. Nurse reports increasing sedation over 30 minutes. Current vital signs: RR 7/min, SpO2 91% on 3L nasal cannula, ETCO2 waveform shows 58 mmHg, BP 128/72 mmHg. Sedation score 3/5, difficult to arouse. What intervention takes priority?
A
Stimulate patient vigorously
B
Discontinue PCA pump
C
Naloxone 0.04 mg IV
D
Increase oxygen to 6L/min
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