Long-Term Anticonvulsant Therapy Worsens Outcome in Paracetamol-Induced Fulminant Hepatic Failure

Author:

Bray Gary P.1,Harrison Philip M.1,O'Grady John G.1,Tredger J. Michael1,Williams Roger1

Affiliation:

1. Institute of Liver Studies, King's College Hospital School of Medicine and Dentistry, Denmark Hill, London SE5 8RX, UK

Abstract

1 Paracetamol hepatotoxicity has been found to be potentiated by anticonvulsant drugs in animal experiments; isolated case reports in humans sugest that long-term anticonvulsant therapy may also adversely influence outcome following overdose. 2 We compared the clinical course, after paracetamol overdose, of 18 patients on long-term anticonvulsant therapy with corresponding features in two published series of paracetamol-induced fulminant hepatic failure from this unit: 297 patients seen between 1973 and 1985 and a further 99 between October 1986 and April 1988. 3 Mortality in those patients who were taking anticonvulsants, but who did not receive N-acetylcysteine, was higher than in either of these series (93.3% vs 64.6% and vs 57.9%, P< 0.025). Although not statistically significant, there were also trends towards more severe coma (grade 3 or 4: 93.3% vs 75.4%, 1986-88), acidosis (pH less than 7.30: 40% vs 22.6%, 1973-85) and coagulopathy (prothrombin time greater than 100 s: 53.3% vs 33.7%, 1973-85). In the small number of patients given N-acetylcysteine, mortality was similar to that in the 1986-88 series (1/3 vs 15/42). 4 We conclude that chronic use of anticonvulsants enhances clinical features of paracetamol toxicity and discuss possible mechanisms by which this could be mediated.

Publisher

SAGE Publications

Subject

Health, Toxicology and Mutagenesis,Toxicology,General Medicine

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