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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Risk factors for carbamazepine elevation and toxicity following epilepsy surgery.

SUMMARY: A proportion of patients undergoing epilepsy surgery, and receiving carbamazepine (CBZ), experience significant elevations in CBZ plasma concentrations, some with associated CBZ toxicity. The objective of this study was to identify significant risk factors for elevations (>12 microg/ml) in CBZ concentrations and CBZ-induced toxicity following epilepsy surgery. METHODS: We retrospectively examined charts of 74 inpatients (31 children and 43 adults) chronically receiving CBZ and undergoing epilepsy surgery between January 1996 and June 2000. Patient demographics, medications, type of surgery, seizure history, adverse events, CBZ doses and concentrations were evaluated. RESULTS: 51.2% of adults and 51.6% of pediatric patients had drug elevations. In the pediatric group, 12.9% had symptoms of toxicity compared to 9.3% in the adult group. Five risk factors-pre-operative CBZ dose, fentanyl dose, surgery day CBZ concentration, body weight, and blood loss-were related to post-operative CBZ concentrations. Three risk factors: age <18 years, pre-operative CBZ dose, and the surgery day CBZ (immediate pre-operative) concentration, were significantly related to the outcome measure of abnormal CBZ concentration (>12 microg/ml). Two variables significantly related to toxicity were average post-operative CBZ dose and the surgery day CBZ concentration. Increases in concentrations occurred at a mean 33+/-13.7 h (range: 11-74 h) after surgery. DISCUSSION: Based upon our results in patients with one or more risk factors, we suggest that reduction of post-operative CBZ doses be considered.[1]


  1. Risk factors for carbamazepine elevation and toxicity following epilepsy surgery. Hiremath, G.K., Kotagal, P., Bingaman, W., Hovinga, C., Wyllie, E., Morris, H., Nelson, D. Seizure : the journal of the British Epilepsy Association. (2005) [Pubmed]
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