Abstract
The mitotic index and proliferation rate index were investigated to determine the effect of phenytoin (PHT) in cultured blood lymphocytes of epileptics prior to and following administration of PHT over a period of 9 months (grouped in multiples of 3 months) and 40 control subjects (age range 10-30 years). Treatment with PHT brought inhibition of the mitotic index (MI) and proliferation rate index (PRI), which were significantly higher in treated subjects or which were more expressive in treated lymphocytes (P < 0.001) for all the three durations of treatment. In addition, statistically significant heterogeneity of first, second, and third metaphases between the treated, untreated, and control subjects was found. Mean PRI values were used to estimate cell cycle delays, showing the highest effect in treated lymphocytes (P < 0.001). There was no considerable variation between the control and untreated (P > 0.05). The study demonstrates that PHT may be potentially genotoxic and hence the usefulness of MI and PRI in monitoring epileptics on anticonvulsant treatment.
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