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  • Title: Changes of cerebrospinal fluid monoamine metabolites during long-term antidepressant treatment.
    Author: Bäckman J, Alling C, Alsén M, Regnéll G, Träskman-Bendz L.
    Journal: Eur Neuropsychopharmacol; 2000 Sep; 10(5):341-9. PubMed ID: 10974605.
    Abstract:
    This study describes the changes in cerebrospinal fluid (CSF) monoamine metabolites during antidepressant treatment for more than 6 months. Eight patients, who received antidepressant treatment after attempted suicide and then underwent lumbar punctures every 3 or 4 months, were included. Plasma drug concentrations and the clinical outcome were also measured. Consistent with previous reports about antidepressant treatment for between 3 and 6 weeks, both 3-methoxy-4-hydroxyphenylethyleneglycol (MHPG) and 5-hydroxyindoleacetic acid (5-HIAA) were significantly decreased after treatment for a mean of 15 weeks compared to pretreatment. However, after continued treatment for a mean of 30 weeks the MHPG concentration remained significantly lower than at pretreatment while 5-HIAA had returned to the pretreatment level. The clinical outcome was significantly correlated to the pretreatment 5-HIAA/MHPG ratio. These results suggest that the frequently reported reduction in CSF 5-HIAA after antidepressant treatment does not remain during long-term treatment.
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