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Anesthesia · single question

How long should a patient receive oxygen after nitrous oxide administration?

  1. 70% for 2-3 min
  2. 100% for 7-9 min
  3. 70% for 3-5 min
  4. 100% for 3-5 minutes
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Correct answer: D. 100% for 3-5 minutes

  • A. This does not match standard nitrous oxide protocol for post-procedure oxygenation.
  • B. This duration is longer than the standard recommended time.
  • C. This concentration (70%) is insufficient; 100% oxygen is recommended post-procedure.
  • D. Correct. Standard protocol recommends 100% oxygen for 3-5 minutes following nitrous oxide sedation to prevent diffusion hypoxia.

Note: Minimum 40% nitrous oxide is typically used to achieve adequate sedation; post-procedure 100% O2 for 3-5 minutes prevents diffusion hypoxia.

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