RESUMO -O presente estudo teve como objetivo analisar os níveis hormonais, as alterações histopatológicas e os agentes etiológicos encontrados na piometra aberta e fechada em cadelas. Foram colhidas 30 amostras de fêmeas ovariohisterectomizadas em clínicas veterinárias da cidade de Curitiba, no Estado do Paraná, no período de outubro de 2002 a maio de 2003. Procedeu-se a exames bacteriológicos, análises histopatológicas dos cornos uterinos e dosagem hormonal da progesterona e do estradiol pela quimioluminescência. A bactéria isolada em maior porcentagem (36%) foi a Escherichia coli, e a alteração histológica de hiperplasia cística endometrial encontrada variou do grau I ao grau III. A proporção entre a progesterona e estradiol teve uma variação significativa nos dois tipos de piometra, porém não foi possível relacionar o agente etiológico, o tipo de lesão e a dosagem hormonal com o tipo de piometra, aberta ou fechada.Palavras chave: Piometra, cadela, aberta, fechada.ABSTRACT -The aim of the present study was to carry out an evaluation of the hormone levels, the histological changes and the etiological agents found in the open and closed pyometra. The uterine horns were collected from 30 bitches subjected to ovariectomy in different veterinary clinics from Curitiba, State of Parana, during the period of October 2002 to May, 2003. Bacteriological cultures, histological analysis and assays of progesterone and estradiol by the chemoluminescent method were performed. Escherichia coli showed to be the most frequent (36%) of the isolated bateria. It has been found the histological analysis that cystic endometrial hyperplasia varied from type I to type III. The progesterone/ estradiol ratio showed a significant variation in regard to the two types of piometra. However, it was not possible to corrrelate the etiological agent, the lesion and the hormonal levels with the open or closed pyometra.
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