Resultado da pesquisa (13)

Termo utilizado na pesquisa cardiomyopathy

#11 - Evolução e reversibiliade das lesões neurológicas e cardíacas em ovinos intoxicados experimentalmente por Ateleia glazioviana e Tetrapterys multiglandulosa, p.129-134

Abstract in English:

ABSTRACT.- Almeida M.B., Priebe A.P.S., Riet-Correa B., Riet-Correa G., Fiss L., Raffi M.B. & Schild A.L. 2008. [Evolution and reversibility of neurologic and cardiac lesions in sheep caused by Ateleia glazioviana and Tetrapterys multiglandulosa.] Evolução e reversibiliade das lesões neurológicas e cardíacas em ovinos intoxicados experimentalmente por Ateleia glazioviana e Tetrapterys multiglandulosa. Pesquisa Veterinária Brasileira 28(3):129-134. Laboratório Regional de Diagnóstico, Faculdade de Veterinária, Universidade Federal de Pelotas, Campus Universitário s/n, Pelotas, RS 96010-900, Brazil. E-mail: alschild@terra.com.br To determine the reversibility of neurological and cardiac lesions in Ateleia glazioviana and Tetrapterys multiglandulosa poisoning, 3 groups of four sheep each were fed orally with the plants. In Group 1, 2 and 3, when sheep with nervous signs showed considerable increase of symptoms and risk of death, the plant administration was suspended. Group 4 with two sheep was used as control. Sheep from Group 1, fed 10g/kg during 6 days of fresh A. glazioviana collected in autumn were euthanized 8, 11, 16, and 21 days after the start of the experiment; they had shown regression of nervous signs, but had progressive cardiac lesions. Sheep from Group 2, fed during 8 days the same dose of fresh A. glazioviana collected in spring, were euthanized on days 9, 23, 38 and 68; they had shown regression of nervous signs and had no cardiac lesions. This suggests that the plant is less toxic in spring. Sheep from Group 3, fed 10g/kg during 11 days dry and ground T. multiglandulosa mixed with concentrated food, were euthanized on days 33, 33, 92 and 92; they had shown regression of nervous signs, and cardiac lesions were less severe on day 33 than on day 92. These results indicate that nervous lesions are reversible after the end of feeding, but cardiac lesions are progressive after discontinuation of the plant administration; these can be afterwards reversible if the animals do not anymore show clinical signs or die as a consequence of the poisoning. Results of those and previous experiments show that lesions of the nervous system are induced by lower doses than cardiac lesions and occur within a shorter period, what suggests that in spontaneous cases cardiac signs are always preceded by nervous signs, and that nervous signs can occur in the absence of cardiac lesions.

Abstract in Portuguese:

ABSTRACT.- Almeida M.B., Priebe A.P.S., Riet-Correa B., Riet-Correa G., Fiss L., Raffi M.B. & Schild A.L. 2008. [Evolution and reversibility of neurologic and cardiac lesions in sheep caused by Ateleia glazioviana and Tetrapterys multiglandulosa.] Evolução e reversibiliade das lesões neurológicas e cardíacas em ovinos intoxicados experimentalmente por Ateleia glazioviana e Tetrapterys multiglandulosa. Pesquisa Veterinária Brasileira 28(3):129-134. Laboratório Regional de Diagnóstico, Faculdade de Veterinária, Universidade Federal de Pelotas, Campus Universitário s/n, Pelotas, RS 96010-900, Brazil. E-mail: alschild@terra.com.br To determine the reversibility of neurological and cardiac lesions in Ateleia glazioviana and Tetrapterys multiglandulosa poisoning, 3 groups of four sheep each were fed orally with the plants. In Group 1, 2 and 3, when sheep with nervous signs showed considerable increase of symptoms and risk of death, the plant administration was suspended. Group 4 with two sheep was used as control. Sheep from Group 1, fed 10g/kg during 6 days of fresh A. glazioviana collected in autumn were euthanized 8, 11, 16, and 21 days after the start of the experiment; they had shown regression of nervous signs, but had progressive cardiac lesions. Sheep from Group 2, fed during 8 days the same dose of fresh A. glazioviana collected in spring, were euthanized on days 9, 23, 38 and 68; they had shown regression of nervous signs and had no cardiac lesions. This suggests that the plant is less toxic in spring. Sheep from Group 3, fed 10g/kg during 11 days dry and ground T. multiglandulosa mixed with concentrated food, were euthanized on days 33, 33, 92 and 92; they had shown regression of nervous signs, and cardiac lesions were less severe on day 33 than on day 92. These results indicate that nervous lesions are reversible after the end of feeding, but cardiac lesions are progressive after discontinuation of the plant administration; these can be afterwards reversible if the animals do not anymore show clinical signs or die as a consequence of the poisoning. Results of those and previous experiments show that lesions of the nervous system are induced by lower doses than cardiac lesions and occur within a shorter period, what suggests that in spontaneous cases cardiac signs are always preceded by nervous signs, and that nervous signs can occur in the absence of cardiac lesions.


#12 - Experimental poisoning by Ateleia glazioviana (Leg.Papilibnoideae) in sheep, 21(3):98-108

Abstract in English:

ABSTRACT.- Stigger A.L., Barros C.S.L., Langohr I.M. & Barros S.S. 2001. [Experimental poisoning by Ateleia glazioviana (Leg.Papilibnoideae) in sheep] Intoxicação experimental por Ateleia glazioviarya (Leg.Papilionoideae) em ovinos. Pesquisa Veterinária Brasileira 21(3):98-108. Depto Patologia, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil. E-mail: cslb@sm.conex.com.br The leaves of Ateleia glazioviana were fed daily to seven sheep. Another sheep was used as côil(rol,. Total amounts (g/kg/body weight) o(;the plant consumed by each animal were 75 during 60 days (Sheep 6), 125 during-25 days (Sheep 4), 13,0 during 13 days (Sheep 7), 150 during 60 days (Sheep 5), 180 during 18 days (Sheep 3), 330 during 33 days (Sheep 2), and 375 during 25 days (Sheep 1 ). Six sheep were fed the green leaves while Sheep 7 was fed dried A. glazioviana leaves. Five sheep (Sheep 1-4 and 7) developed clinical signs 8 to 16, days after the first administration of the plant. The clinical course varied from 6 to 50 days and clinical signs included apathy, loss of appetite, and increased heart and respiratory rates; affected sheep were ·reluctant to move and showed a low carriage of the head, instability of the hind limbs, and staggering gait. Some sheep supported their weight against the wall of the stable. Sheep 1, 3, and 4 died spontaneously; paddling movements preceded death. Sheep 2 and 7 were euthanatized when presenting marked clinical signs of the toxicosis. Sheep 5 and 6 did not get clinically ill and were euthanatized along with the control sheep 103 days after the first administration of the plant. All sheep were necropsied and several of their organs, including heart and brain, were evaluated histologically. Additionally, fragments of the myocardium of Sheep 3 and 4 were evaluated by transmission electron microscopy. To provide more controls for the myocardial changes, the hearts were collected from six animals at an abattoir known to slaughter sheep from regions free of A. glazioviana. These hearts were processed for histology and examined in the same way as the other eight. All seven treated (plant fed) sheep had gross changes at necropsy. There were firm, irregular white or yellow areas in the myocardium of all treated sheep. These pale areas were more evident on the cut surface of the heart. Hydrothorax and/or hydropericardium were observed in five animals (Sheep 1-4 and 7). Nutmeg livers were seen in Sheep 1 and 7. This latter sheep also had ascites. The main histopathological findings in treated sheep were degenerative/necrotic changes in the myocardium. The early changes consisted of acute swollen myocardial fibers associated with bizarre nuclei. Apparently this change progressed until the sarcoplasm disappeared and an empty collapsed sarcolemmal tube remained surrounded by interstitial connective tissue and fibrosis. Overt necrosis (hyaline and floccular) associated with mono nuclear infiltration and phagocytosis of fiber fragments were also observed. Varying degrees of spongy degeneration were seen in the white matter of the brain of Sheep 1, 3, 4 and 7. Mitochondrial swelling and loss of density of the mitochondrial matrix were the earliest ultrastructural changes observed. In advanced lesions cardiac cells had vacuoles in the sarcoplasm, rupture of the sarcolemma and necrosis with intervening macrophages and fibroblasts associated with increased collagen.

Abstract in Portuguese:

Stigger A.L., Barros C.S.L., Langohr I.M. & Barros S.S. 2001. [Experimental poisoning by Ateleia glazioviana (Leg.Papilibnoideae) in sheep] Intoxicação experimental por Ateleia glazioviarya (Leg.Papilionoideae) em ovinos. Pesquisa Veterinária Brasileira 21(3):98-108. Depto Patologia, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil. E-mail: cslb@sm.conex.com.br Sete ovelhas receberam as folhas de Ateleia glazioviana em doses predeterminadas. Um outro ovino serviu de controle. As quantidades totais (g/kg/peso corporal) de planta consumidas pelos ovinos foram 75 por 60 dias (Ovino 6), 125 por 25 dias (Ovino 4), 130 por 13 dias (Ovino 7), 150 por 60 dias (Ovino 5), 180 por 18 dias (Ovino 3), 330 por 33 dias (Ovino 2) e 375 por 25 dias (Ovino 1). Seis ovinos recéberam folhas verdes e o Ovino 7 recebeu folhas dessecadas. Cinco ovinos (Ovinos 1-4 e 7) desenvolveram sinais clínicos. 8 a 16 dias após a primeira administração da planta. A evolução do quadro clínico foi de 6 a 50 dias e os sinais clínicos. incluíram apatia, perda do apetite, taquicardia e taquipnéia. Os ovinos afetados apresentavam relutância em mover-se, cabeça baixa, instabilidade dos membros pélvicos e andar cambaleante. Alguns dos ovinos afetados apoiavam o corpo contra a parede da baia. Os Ovinos 1, 3 e 4 morreram espontaneamente; movimentos de pedalagem precederam a morte. Os Ovinos 2 e 7 foram submetidos à eutanásia com sinais clínicos avançados da toxicose. Os Ovinos 5 e 6 não adoeceram e foram sacrificados junto com o controle 103 dias após a primeira administração da planta. Todos os ovinos foram necropsiados e vários órgãos, incluindo coração e encéfalo, foram avaliados histologicamente. Além disso, fragmentos de miocárdio dos Ovinos 3 e 4 foram avaliados por microscopia eletrônica de transmissão. A fim de se obter mais controles para a avaliação das lesões do miocárdio, coletaram-se os corações de seis ovinos abatidos para consumo em um abatedouro que sabidamente recebe ovinos originários de uma região livre de A. glazioviana. Esses corações foram processados para histologia e examinados da mesma maneira que os outros oito. Todos os ovinos tratados (que receberam a planta) apresentaram lesões macroscópicas. Havia áreas firmes, irregulares, branco-amareladas no miocárdio de todos os ovinos tratados. Essas áreas pálidas eram mais bem vistas na superfície de corte do coração. Hidrotórax e/ou hidropericárdio foram observados em cinco animais (Ovinos 1-4 e 7). O fígado dos Ovinos 1 e 7 tinha aspecto de nozmoscada. O Ovino 7 apresentava ascite. Os principais achados histopatológicos nos ovinos tratados foram alterações degenerativas/necróticas no miocárdio. As alterações iniciais consistiam de tumefação aguda das fibras cardíacas, associada a núcleos com formas bizarras. Essa alteração aparentemente progredia até o desaparecimento do sarcoplasma, resultando num tubo sarcolemal vazio e colapsado envolto por tecido conjuntivo intersticial e fibrose. Necrose franca (hialina e flocular) associada à infiltração mononuclear e fagocitose de fragmentos de fibras foi também observada. Graus variáveis de degeneração esponjosa foram observados na substância branca do encéfalo dos Ovinos 1, 3, 4 e 7. Tumefação de mitocôndrias e perda da densidade da matriz das mitocôndrias foram as alterações ultra-estruturais mais precoces. Em lesões avançadas os cardiomiócitos apresentavam vacúolos no sarcoplasma, ruptura do sarcolema e necrose com aparecimento de macrófagos e fibroblastos associados a aumento de colágeno.


#13 - Salinomycin poisoning in cattle

Abstract in English:

An outbreak of salinomycin toxicosis is reported. Out of a lot of 46 Simmental heifers 13 died after presenting incoordination, stiff gait, diarrhea, weight loss, muscle tremors, reduced tolerance to exercise, dyspnea and, occasionally, dark urine. Some animals were found dead or died when forced to move. Gross lesions consisted basically of pale areas in the myocardium, subepicardial hemorrhages, hydropericardium, hydrothorax, pulmonary congestion and edema, and, in some cases, pendent subcutaneous edema and nutmeg liver. Main histopathological changes consisted of necrosis and loss of myocardial fibers which were replaced by fibrous connective tissue. Approximately 9 days before the first deaths the heifers had been treated for eimeriosis with a premix containing 6% of salinomycin.

Abstract in Portuguese:

Descreve-se um surto de intoxicação. Por salinomicina em bovinos. De um grupo de 46 novilhas Simmental, 13 morreram após manifestação de incoordenação, andar rígido, diarréia, emagrecimento, tremores musculares, cansaço após pequenos movimentos, dispneia e, ocasionalmente, urina escura. Os animais eram encontrados mortos ou morriam subitamente quando movimentados. As lesões macroscópicas consistiam basicamente de áreas pálidas no miocárdio, hemorragias subepicárdicas, hidropericárdio, hidrotórax, congestão e edema pulmonar e, em alguns casos, edema de declive e fígado de noz-moscada. Os principais achados microscópicos foram lesões multifocais de necrose e perda de fibras miocárdicas, que eram substituídas por tecido conjuntivo fibroso. Cerca de 9 dias antes do início da mortandade, as novilhas tinham sido medicadas para eimeriose, com um premix contendo 6% de salinomicina.


Colégio Brasileiro de Patologia Animal SciELO Brasil CAPES CNPQ UNB UFRRJ CFMV