Acute, subacute and chronic sequelae of horses accidentally exposed to monensin-contaminated feed

Equine Veterinary Journal
Clémentine GyJean-Pierre Lavoie

Abstract

Monensin is highly toxic to horses and inadvertent ingestion can result in cardiac injury and death. To describe sequelae of monensin ingestion and to determine clinical predictors of outcome. Observational clinical study. Physical examination, electrocardiogram and echocardiography were performed on 76 horses accidentally exposed to monensin-contaminated feed. Four horses were examined within 14 days of exposure (acute period), 29 horses were examined between 15 and 45 days post-exposure (subacute period) and 70 horses were examined 4-10 months after exposure (chronic period). Follow-up information was obtained for 56 horses by telephone interviews approximately 16 months after exposure. Cardiac abnormalities were detected in 4/4, 19/29 and 31/70 horses during the acute, subacute and chronic periods, respectively. Sixteen months post-exposure, 34 of the 64 horses (53%) for which the outcome was known had returned to their previous use, 13 (20%) were reported to be exercise intolerant, three (5%) were retired and 14 (22%) were dead (two deaths, 12 euthanasia). Thinning of the myocardium observed at any point in time was associated with a negative outcome. Heterogeneity of the myocardium observed in the acute/subacute period was...Continue Reading

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Citations

Dec 12, 2020·Toxicology and Industrial Health·Zhiqiang ZhangJinying Zhang
Feb 10, 2021·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·Rodrigo Barcellos HoffHeitor Daguer

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