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Updated: Sep 16, 2025

A Novel Inhalation Mask System to Deliver High Concentrations of Nitric Oxide Gas in Spontaneously Breathing Subjects
Published on: May 4, 2021
Nitrous Oxide: No More a Laughing Matter
Amit Badshah1, Abir Aijaz1, Abdul Bhat1
1Acute and General Internal Medicine, Weston General Hospital, University Hospitals Bristol and Weston, Weston-super-Mare, GBR.
Nitrous oxide (N₂O) can cause spinal cord degeneration, though it is rare. This case highlights prolonged N₂O exposure leading to subacute combined degeneration with a notable recovery.
Area of Science:
- Neurology
- Toxicology
- Genetics
Background:
- Subacute combined degeneration (SCD) of the spinal cord is a neurological condition.
- Nitrous oxide (N₂O) is an infrequent but recognized etiological agent for SCD.
- Genetic factors, including vitamin B12 processing gene polymorphisms, may predispose individuals to myelopathy.
Observation:
- The presented case involves a patient with prolonged nitrous oxide exposure exceeding two years.
- The neurological involvement was characterized by dorsal column compromise in the thoracic spine.
- The patient exhibited a distinct clinical course compared to typical presentations.
Findings:
- The patient experienced rapid and substantial neurological recovery within two months.
- This outcome suggests potential for significant reversal of N₂O-induced spinal cord damage.
- The case underscores the importance of considering N₂O toxicity in differential diagnoses of myelopathy.
Implications:
- Early identification and cessation of nitrous oxide exposure are crucial for favorable outcomes.
- Further research into genetic predispositions for N₂O-related myelopathy is warranted.
- This case expands the understanding of nitrous oxide's neurotoxic effects and recovery potential.
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