Читать книгу Farm Animal Medicine and Surgery - Graham R Duncanson - Страница 173

Bleeding disorders

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These are relatively rare and therefore represent a considerable diagnostic challenge for the clinician (Bell, 2011). In disorders of primary haemostasis, only a small amount of blood loss occurs from an injury site before a fibrin clot is formed by secondary haemostasis. Petechiae will be seen in the mucosa. In disorders of secondary haemostasis, large-volume bleeds will be seen in the body cavities. Primary disorders will cause thrombocytopenia, which is seen in acute bracken fern toxicity, acute infection with BVD virus, trichothecene mycocytosis, bovine neonatal pancytopenia (typically in calves under 1 month of age showing pyrexia and unexplained haemorrhage from the nose), ingestion of bone-marrow suppressive substances, e.g. furazolidone (now prohibited in the EU), and inherited bovine thrombopathia in Simmental cattle. Secondary disorders are seen in inherited deficiency of coagulation factor XI, Warfarin poisoning and mouldy sweet clover poisoning. Treatment is with blood transfusions (see Chapter 4).

Farm Animal Medicine and Surgery

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