Abstract
We have examined the correlation between the presence of epilepsy in humans, and plasma amino acid levels. Subjects were divided into those having pure generalized tonic-clonic seizures (grand mal group), those having generalized tonic-clonic seizures plus other types of epilepsy (mixed group), and those suffering from epilepsies other than grand mal (no grand mal group). Compared to non-epileptic controls, the grand mal group had significantly higher fasting plasma levels of aspartate (100% increase) and glutamate (380% increase) but significant decreases were seen with phenylalanine (?23%), lysine (?27%), and tryptophan (?30%). The no grand mal group showed similar changes except for lysine. The mixed group showed elevations in glutamate, but decreases only in cysteine and methionine. In response to a high protein meal, plasma levels of alanine, cysteine and methionine rose significantly less for the no grand mal group compared to the control group. Increases in aspartate and glutamate concentrations strongly correlated with the prescription of phenytoin. However, the concentrations of these amino acids were not significantly correlated with the actual plasma levels of phenytoin.
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