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Characterization of cardiac lesions in calves after ingestion of Japanese yew (Taxus cuspidata).
Sula, Mee Ja M; Morgan, Sandra; Bailey, Keith L; Schumpert, Mark; Njaa, Bradley L.
Afiliação
  • Sula MJ; Department of Veterinary Pathobiology, Oklahoma State University, Stillwater, OK, USA. mee-ja.sula@okstate.edu
J Vet Diagn Invest ; 25(4): 522-6, 2013 Jul.
Article em En | MEDLINE | ID: mdl-23780931
ABSTRACT
Plants of the genus Taxus are common ornamental shrubs that contain cardiotoxic alkaloids. Gross lesions consistent with heart failure are frequently reported in fatal cases; however, microscopic lesions in the heart have not been well characterized. The current report describes 2 related outbreaks in which 7 of 30, 250-kg calves died after confirmed exposure to clippings of Japanese yew (Taxus cuspidata). Three calves died 24 hr after initial exposure, with no significant gross or histologic lesions. Leaves of the yew plant were identified within the rumen contents, and Taxus alkaloids were confirmed by gas chromatography-mass spectrometry. Following the initial diagnosis, the yew clippings were burned. Two days later, the remaining calves were reintroduced to the enclosure. Within 24 hr, 3 additional calves began to show clinical signs of depression (3/3) or labored breathing (1/3), and by the fourth day, these 3 calves and an additional calf were found dead. Partially burnt yew leaves were found during close inspection of the enclosure. Two of 3 calves submitted for necropsy were severely autolyzed; the third had pulmonary edema and mild fibrinous pleural effusion. Histologic lesions in the latter included multifocal cardiac myocyte hypereosinophilia, sarcolemma fragmentation, pyknosis, karyolysis, myocyte loss, and a mild interstitial lymphoplasmacytic infiltrate with edema. Moderate fibrinosuppurative interstitial pneumonia was the only other significant finding. Cardiac changes were attributed to damage from the initial exposure to Taxus 6 days prior to death.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Intoxicação por Plantas / Doenças dos Bovinos / Taxus / Cardiopatias Tipo de estudo: Prognostic_studies Limite: Animals Idioma: En Revista: J Vet Diagn Invest Ano de publicação: 2013 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Intoxicação por Plantas / Doenças dos Bovinos / Taxus / Cardiopatias Tipo de estudo: Prognostic_studies Limite: Animals Idioma: En Revista: J Vet Diagn Invest Ano de publicação: 2013 Tipo de documento: Article