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Chi-Wan Lai, MD; Ilo E. Leppik, MD; David C. Jenkins, MD; Paul Sood, PhD

Arch Neurol. 1990;47(1):66-68.

Abstract
• A 28-year-old woman developed complex partial seizures at the age of 17 years and was treated with phenytoin sodium. Five years later she developed myasthenia gravis, and phenytoin was replaced by valproic acid and phenobarbital. She required plasmapheresis (PP). During one course of PP, total and unbound concentrations of valproic acid and phenobarbital were measured in serum sampled before, during, and after PP and in plasma removed by PP. It was determined that the magnitude of loss of valproic acid or phenobarbital by PP was small, and the changes of unbound/total ratio did not reach clinical importance.

Author Affiliations
From the Departments of Neurology (Dr Lai) and Clinical Pharmacology (Dr Sood), University of Kansas Medical Center, Kansas City; the Department of Neurology, University of Minnesota, Minneapolis (Dr Leppik); and the Community Blood Center of Greater Kansas City (Mo) (Dr Jenkins).

Footnotes
Accepted for publication July 11, 1989.

Reprint requests to Department of Neurology, University of Kansas Medical Center, 39th and Rainbow Boulevard, Kansas City, KS 66103 (Dr Lai).

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