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Vet Pathol 42:665-669 (2005)
© 2005 American College of Veterinary Pathologists
BRIEF COMMUNICATIONS AND CASE REPORTS

Putative Metronidazole Neurotoxicosis in a Cat

E. J. Olson, S. C. Morales, A. S. McVey and D. W. Hayden

Abstract

A presumptive case of metronidazole toxicity in a 3.4-kg adult cat is described. The cat had been treated for suspected inflammatory bowel disease with an anti-inflammatory dose of prednisone and metronidazole (73.5–147 mg/kg PO q24h) for approximately 40 days prior to presentation. Clinical signs were primarily related to the central nervous system, including acute tetraparesis, unresponsiveness, tremors, and vocalization. The patient was euthanatized after 12 days of supportive care. Necropsy revealed no significant macroscopic lesions. Histologic evaluation revealed multifocal, fairly well-demarcated foci of necrosis in the brainstem, extending from the diencephalon to the medulla oblongata. To our knowledge, this is the first report to document histologic lesions associated with metronidazole administration in a cat.

Key words: Ataxia; brainstem; cats; metronidazole; necrosis; neurotoxicosis.

Request reprints from Dr. D. W. Hayden, Department of Veterinary Population Medicine, College of Veterinary Medicine, 244 Veterinary Diagnostic Laboratory, 1333 Gortner Avenue, University of Minnesota, St. Paul, MN 55108 (USA). E-mail: hayde002{at}umn.edu.


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