Subacute combined degeneration from nitrous oxide abuse.
Harjinder Singh1, Nitya Beriwal2, Jasdeep Singh Minhas3
1Department of Internal Medicine, Henry Ford Allegiance Health, Jackson, MI, USA.
Radiology Case Reports
|September 19, 2024
Summary
Prolonged nitrous oxide abuse can cause functional Vitamin B12 deficiency, leading to subacute combined degeneration (SCD) of the spinal cord. This case highlights nitrous oxide abuse as a key cause of myeloneuropathy in patients with weakness.
Area of Science:
- Neurology
- Toxicology
- Biochemistry
Background:
- Nitrous oxide (N2O) is an anesthetic agent with potential for recreational abuse.
- Recreational N2O abuse, often via whippet canisters, can disrupt Vitamin B12 metabolism.
- This disruption can lead to functional Vitamin B12 deficiency and neurological complications.
Observation:
- A 30-year-old male presented with generalized weakness.
- Subacute combined degeneration (SCD) of the spinal cord was diagnosed.
- Laboratory results revealed low Vitamin B12, elevated homocysteine, and methylmalonic acid levels.
Findings:
- Further investigation confirmed prolonged nitrous oxide abuse as the cause.
- N2O inactivates methylcobalamin, a crucial coenzyme for methionine synthase.
- This impairs methionine synthesis, affecting myelin production and leading to neurological damage.
Implications:
- Nitrous oxide abuse should be considered in the differential diagnosis of myeloneuropathy and weakness.
- Early recognition and cessation of N2O abuse are critical for managing Vitamin B12 deficiency.
- Understanding the biochemical mechanism of N2O toxicity aids in diagnosing and treating related neurological conditions.
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