• Br J Anaesth · Feb 1984

    Prevention of nitrous oxide-induced megaloblastic changes in bone marrow using folinic acid.

    • R J Amos, J A Amess, D G Nancekievill, and G M Rees.
    • Br J Anaesth. 1984 Feb 1; 56 (2): 103-7.

    AbstractProlonged anaesthesia with nitrous oxide inactivates vitamin B12 and impairs DNA synthesis in bone marrow cells. The use of parenteral folinic acid in the prevention of these toxic effects has been studied in 11 patients, ventilated artificially with nitrous oxide in oxygen for 24 h. Bone marrow aspirates were performed before and after exposure to nitrous oxide. They were assessed morphologically and with the deoxyuridine suppression test. Folinic acid 30 mg immediately before anaesthesia and 30 mg 12 h later, prevented the toxic effects of nitrous oxide in four out of five patients, whereas smaller amounts of folinic acid (between 3 and 36 mg in 24 h), were ineffective.

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