In 35 patients on long-term anticonvulsant treatment (7-35 years, means = 19.6 years), various liver enzymes were measured. In 32 cases (91.4%), elevated levels of serum-gamma-glutamyl-transpeptidase (GGT) were found. Liver biopsy was performed in five of 13 patients with GGT levels of greater than 60 U/l (75-257, means = 123 U/l). Light microscopy showed a minimal steatosis and fine granular appearance of hepatocytes in two cases, and a slight portal fibrosis in one case. Two cases showed an unremarkable histology. Electron microscopy revealed signs of enzyme induction as overall swelling of the smooth endoplasmic reticulum and additionally a dilatation of the rough endoplasmic reticulum in all five specimens. No signs of liver damage or disturbance of liver function could be observed.
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Pamperl et al. (1984) studied this question.
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