Delayed monensin sodium toxicity in horses

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Abstract
Horses (32) with a history of poor performance and unthriftiness several months after the ingestion of feed containing monensin sodium [a coccidiostat] were examined. Cardiac abnormality was diagnosed in 8 cases and suspected in 4 others. Necropsy examinations were performed on 6 cases with marked clinical symptoms and evidence of circulatory failure was found. Marked cardiac myopathy and fibrosis was a consistent feature. Ingestion of monensin sodium by horses may cause acute death or delayed cardiac circulatory failure as a result of specific cardiac myodegeneration.

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