PEDIATRICS Vol. 72 No. 6 December 1983, pp. 831-834
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Phenytoin-Induced Choreoathetosis in Infancy: Case Reports and a Review

K. S. Krishnamoorthy MD1, E. L. Zalneraitis MD1, R. S. K. Young MD1, and P. G. Bernad MD1

1 From the Departments of Neurology and Pediatrics, Harvard Medical School, Massachusetts General Hospital, Boston

Three cases of choreoathetosis which developed during phenytoin therapy in children less than 2 years of age are described. The most striking clinical manifestations included the sudden onset of restlessness and agitation with superimposed choreoathetosis. None of these children had toxic levels of phenytoin in the blood. Discontinuation of phenytoin resulted in prompt cessation of the symptoms. Phenytoin-induced choreoathetosis should be a diagnostic consideration in children with a preexisting CNS insult who manifest violent choreoathetosis during therapy for seizure control. This consideration is especially pertinent in the pediatric intensive care unit, where other more common causes of agitation could be misdiagnosed.

Key Words: phenytoin • anticonvulsants • choreoathetosis • pediatric intensive care unit

Submitted on December 20, 1983
Accepted on March 16, 1983




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