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Sickle cell disease and nitrous oxide-induced neuropathy
O Ogundipe1, M W Pearson, N G Slater
1Departments of Haematology and Neurology, St. Thomas' Hospital, London, UK.
Clinical and Laboratory Haematology
|February 15, 2000
Summary
Prolonged nitrous oxide use in sickle cell disease patients may cause peripheral neuropathy, especially with low vitamin B12. Treatment with vitamin B12 and discontinuing nitrous oxide led to complete neurological recovery.
Area of Science:
- Neurology
- Hematology
Background:
- Sickle cell disease (SCD) patients often experience painful crises requiring analgesia.
- Nitrous oxide (N2O) is a common analgesic but has known neurological side effects.
Observation:
- Three SCD patients developed peripheral sensorimotor neuropathy after prolonged N2O analgesia.
- Patients presented with walking difficulties and paresthesiae.
- Two patients had mild B12 deficiency, one had severe deficiency (<10 ng/l).
Findings:
- Neuropathy symptoms improved completely with intramuscular vitamin B12 and N2O cessation.
- Nerve conduction studies confirmed peripheral neuropathy.
- Serum vitamin B12 levels were low in all affected patients.
Implications:
- Nitrous oxide analgesia may precipitate or exacerbate neuropathy in SCD patients, particularly those with B12 deficiency.
- Clinicians should consider N2O's neurotoxic potential in SCD management.
- Avoidance of prolonged N2O use is recommended for SCD patients to prevent neurological complications.