• Lancet · Oct 1991

    Is postoperative delirium related to reduced plasma tryptophan?

    • R C van der Mast, D Fekkes, P Moleman, and L Pepplinkhuizen.
    • Department of Psychiatry, Dijkzigt Hospital, Rotterdam, Netherlands.
    • Lancet. 1991 Oct 5;338(8771):851-2.

    AbstractThe cause of postoperative delirium is unknown. In 7 patients with postcardiotomy delirium (6 men, 1 woman; mean age 67 years), we observed a plasma concentration of tryptophan and a plasma tryptophan ratio significantly lower than in 8 non-delirious postoperative control patients. We suggest that the mental symptoms of postcardiotomy delirium are the consequence of a reduced cerebral tryptophan availability due to a catabolic state.

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