A total of 84 children were investigated: 15 with bronchial asthma, 41 with combined seizure and bronchial obstruction syndrome, 14 with epilepsy. The kynurenine blood level was found to correlate with seizures. It was highest in epilepsy (5.27 +/- 0.99 nM/ml) together with the lowest dioxygenase activity (0.53 +/- 0.29 nM/ml) as measured with the tryptophane loading. The data suggest that kynurenine being a major tryptophane metabolite plays a role in pathogenesis of convulsive states.

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