nitrous oxide
Pronunciation: NY-trus OK-syd
An inorganic, colourless gas (N₂O) used in dentistry as an inhaled anxiolytic and analgesic agent, typically delivered via nasal hood in subanesthetic concentrations.
Full Definition
Nitrous oxide (N₂O) is the most widely used inhaled agent in dental sedation, prized for its rapid onset, quick offset, and analgesic properties at subanesthetic doses. It is administered as a mixture with oxygen, with concentrations rarely exceeding 50–70% in outpatient dental settings. Nitrous oxide is classified as an inhaled anxiolytic/analgesic rather than a true general anesthetic agent for most dental applications. Editors should note that 'nitrous oxide' is always two words, never hyphenated, and the chemical formula N₂O uses a subscript numeral. The colloquial term 'laughing gas' is inappropriate in clinical documents.
Usage
Usage note: Never hyphenate. Avoid 'laughing gas' in clinical or regulatory copy. The chemical symbol N₂O requires a subscript '2'; confirm formatting in tables.
In Context
- "A 30% nitrous oxide/70% oxygen mixture was titrated over five minutes until the patient reported tingling in the extremities." — Sedation technique description
- "The manufacturer's warning label specifies that nitrous oxide cylinders must be stored upright in a ventilated area." — Facility safety policy document