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Anesthesia · single question

A patient is given 25% nitrous oxide. What level of sedation does this represent?

  1. No sedation
  2. Minimal sedation
  3. Moderate sedation
  4. Deep sedation
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Correct answer: B. Minimal sedation

Nitrous oxide concentrations in the range of roughly 25-30% are generally classified as producing minimal sedation (anxiolysis) — the patient remains fully conscious, responsive, and able to maintain their airway independently, distinguishing this from moderate or deeper sedation levels achieved at higher concentrations or combined with other agents.
  • A. Any clinically effective concentration of N2O constitutes at least minimal sedation.
  • B. 25% N2O typically produces minimal sedation (anxiolysis). Patients are relaxed, fully conscious, respond normally to verbal commands, and maintain their own airway.
  • C. Moderate sedation with N2O typically requires concentrations >50% or combination with other agents.
  • D. Deep sedation is not achievable with N2O alone at standard dental concentrations.

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