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dc.contributor.authorSonne, Lucianapt_BR
dc.contributor.authorRaymundo, Djeison Lutierpt_BR
dc.contributor.authorCecco, Bianca Santana dept_BR
dc.contributor.authorSantos, Adriana da Silvapt_BR
dc.contributor.authorPescador, Caroline Argentapt_BR
dc.contributor.authorOliveira, Eduardo Conceição dept_BR
dc.contributor.authorDriemeier, Davidpt_BR
dc.date.accessioned2018-07-04T02:27:00Zpt_BR
dc.date.issued2018pt_BR
dc.identifier.issn1678-0345pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/180061pt_BR
dc.description.abstractBackground: Kernicterus or bilirubin encephalopathy is a condition rarely observed in animal characterized by a yellowish discoloration of the central nervous system. It is a potentially fatal condition due to bilirubin neurotoxic effects caused by the increase of non-conjugated bilirubin pigment, which passes blood brain barrier and has been attributed to an imbalance between albumin and bilirubin levels. Intracellular bilirubin is toxic for cells and can cause decrease in protein synthesis, specially albumin, depression of cell respiration and cellular death. This paper describes kernicterus in a 2-year-old Great Dane female dog. Case: Clinically, the animal showed apathy, lethargy, weight loss and jaundice, which progressed to vomiting and neurological signs characterized by loss of consciousness and eventually coma. Blood parameters were within normal range, except for high levels of alanine aminotransferase (523 U/L), suggesting a liver lesion. The animal was submitted to euthanasia due to the poor prognosis, and at post-mortem examination it showed dehydration and severe jaundice, especially oral, vaginal and ocular mucosas, subcutaneous tissue and blood vessels intima surface. The liver had an accentuated lobular pattern, and the stomach mucosa was reddened. Multiple petechiae were observed in the epicardium, as well as icterus in the blood vessels of the heart. Furthermore, the brain and cerebellum cortex, thalamic region and nuclei region of brainstem showed extensive icteric areas. Microscopically, the liver presented a mononuclear portal hepatitis, centrilobular necrosis and presence of yellowish pigments. The brain had neuronal necrosis, mild vacuolization of the white matter, perineuronal edema and Alzheimer type II astrocytes, while cerebellum showed Purkinje cells necrosis. Hepatic cooper measurement was within range values, and direct imunofluorescence for the detection of Leptospira sp. was negative. (Continuação...) Discussion: Kernicterus pathogenesis has been extensively studied, as the condition is commonly seen in neonatal humans. Diagnosis is based on gross and microscopic lesions in brain, which are consistent with bilirubin encephalopathy caused by the necrosis and degeneration of neurons. This condition is related to cases of intense hyperbilirubinemia, which exceeds the albumin binding capacity and, therefore, the excess of unconjugated bilirubin that can pass through the blood brain barrier. Liver disease causes deficient production of protein, especially albumin, decreasing the potential binding capacity to bilirubin, and consequently causing hyperbilirubinemia. In this case, the previously detected hepatic lesion suggested by liver enzymes increased, probably led to protein production dysfunction, causing hypoalbuminemia and hyperbilirubinemia. Unfortunately, albumin and bilirubin seric levels could not be measured. Decrease in albumin production along with the excess of unconjugated bilirubin caused the jaundice, and in cases like this one described, the blood brain barrier is compromised and the kernicterus occurs. Unconjugated bilirubin has negative effect in the glutamate uptake causing extracellular accumulation of it, which is consequently neurotoxic, causing necrosis and degeneration leading to a characteristic encephalopathy in animals with kernicterus. In this report, it was not possible to determine the primary hepatic disease, however this caused clinical neurotoxic disease, known as bilirubin encephalopathy.en
dc.format.mimetypeapplication/pdf
dc.language.isoengpt_BR
dc.relation.ispartofActa scientiae veterinariae. Porto Alegre, RS. Vol. 46, supl. 1 (2018), Pub. 250, 3 p.pt_BR
dc.rightsOpen Accessen
dc.subjectKernicteruspt_BR
dc.subjectKernicterusen
dc.subjectHiperbilirrubinemiapt_BR
dc.subjectIcterusen
dc.subjectDogen
dc.subjectBilirrubinapt_BR
dc.subjectCãespt_BR
dc.titleKernicterus in an adult dogpt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb001069290pt_BR
dc.type.originNacionalpt_BR


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