Rare but relevant: Nitrous oxide and peripheral neurotoxicity, what do we know?
Tibor M Brunt1, Wim van den Brink1, Jan van Amsterdam1
1Amsterdam UMC, Department of Psychiatry, University of Amsterdam, Amsterdam, The Netherlands.
Addiction (Abingdon, England)
|December 23, 2024
Summary
Recreational nitrous oxide (N2O) use can cause unexpected neurotoxicity by inactivating vitamin B12, leading to nerve damage. Early cessation and B12 treatment can help, but some effects may linger.
Area of Science:
- Neuroscience
- Toxicology
- Neurology
Background:
- Nitrous oxide (N2O) is increasingly used recreationally, posing risks beyond its anesthetic applications.
- Users are often unaware of the neurotoxic potential of N2O, particularly with prolonged or heavy use.
- The neurotoxic effects are linked to vitamin B12 inactivation, disrupting essential metabolic pathways.
Purpose of the Study:
- To elucidate the neurotoxicological mechanism of recreational nitrous oxide.
- To highlight the risk of demyelinating diseases associated with N2O use.
- To inform about potential treatments and individual vulnerabilities.
Main Methods:
- Review of existing literature on N2O neurotoxicity.
- Analysis of the biochemical pathway involving vitamin B12 and methionine synthesis.
- Clinical observation of N2O-induced peripheral neuropathy.
Main Results:
- Nitrous oxide inactivates vitamin B12 (cobalamin), inhibiting methionine synthesis.
- This disruption impairs myelin sheath maintenance, potentially causing generalized demyelinating polyneuropathy (GDP).
- The clinical incidence of N2O-induced neuropathy is underreported but may be significant.
Conclusions:
- Immediate cessation of N2O use and vitamin B12 supplementation are crucial for treatment.
- While treatment can reverse damage, residual symptoms like limb weakness may persist.
- Genetic and dietary factors, such as pre-existing vitamin B12 deficiency, can increase susceptibility to N2O neurotoxicity.
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