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To assess maturation of central serotonin and catecholamine pathways at birth, we measured lumbar CSF homovanillic acid (HVA) and 5-hydroxyindoleacetic acid (5-HIAA), stable acid metabolites of dopamine and serotonin, using HPLC with electrochemical detection. CSFs from 57 neonates (38 premature and 19 at term) and 13 infants 1-6 months old were studied. HVA levels increased with maturity (p less than 0.05; ANOVA), whereas 5-HIAA levels were similar in all these subjects. HVA/5-HIAA ratios increased markedly from 1 +/- 0.12 in the most premature neonates to 1.98 +/- 0.17 in the older infants (p less than 0.01; t test). There were no sex differences for these values.
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