Purpose:To evaluate macro and microscopically the late evolution of autotransplants of fragments of spleen in the greater omentum, mesenterium and peritoneal cavity, after 24 weeks of observation. Methods: Fifty two Wistar rats were used, males and adults, submitted to total splenectomy and divided in four groups. The group I -seventeen animals with implant of spleen fragment in the peritoneal cavity; group II -eighteen animals with implant in the omentum and group III -seventeen animals with implant fixed in mesenterium root. The group control (group IV) was formed by eight animals chosen aleatorily among the three groups. It was analyzed macro and microscopically the evolution of the implant, and in the histological study qualitative and quantitative criteria were adopted, with the counting of no cellular e cellular elements. Results: It was observed adherences to the adjacent tissues and vascularization in all of the fragments transplanted. The group I presented white pulp and preserved vascularization. In the group II were observed white pulp with follicular formations and lymphoid tissue preserved, and the red pulp in cordon aspect and hemorrhagic. In the group III were observed with depletion of white and red pulp, while others evidenced better preservation of the pulps. The counting of lymphocytes revealed significant difference between the groups I and IV and the group III and IV (p < 0.05). The counting of active macrophages revealed significant difference between the groups II and III (p < 0.05) and similarity between II and IV (p > 0.05). The other elements: active macrophages phagocyting hemosiderine, plasmocytes, fibroblasts, fibrocytes, giant cells, monocytes, interstitial spaces and fibers of collagen, did not show significant difference among the groups. Conclusions: The splenic autotransplantation is feasible, being the better place the greater omentum. This research demonstrated through qualitative and quantitative histological analysis that the splenic tissue autotransplanted in the omentum of Wistar rats preserves its function of defense of the organisms. Key words: Spleen. Transplantation, Autologous. Macrophages. Rats. RESUMO Objetivo:Avaliar macro e microscopicamente a evolução tardia do autotransplante de fragmentos de baço no grande epiplon, mesentério e cavidade peritoneal, após 24 semanas de observação. Métodos: Foram utilizados 52 ratos Wistar, machos e adultos, submetidos a esplenectomia total e divididos em quatro grupos. O grupo I -dezessete animais com implante de fragmento de baço solto na cavidade peritoneal; grupo II -dezoito animais com implante no grande epiplon e grupo III -dezessete animais com implante fixado na raiz do mesentério. O grupo controle (grupo IV) foi formado por oito animais escolhidos aleatoriamente entre os três grupos. Foram analisados macro e microscopicamente a evolução do implante, sendo que no estudo histológico foram adotados critérios qualitativos e quantitativos, com a contagem de elementos celulares e não celulares. Resultados: Foram observ...

Caracterização macro-e microscópica dos ovários do bagre amarelo, Cathoropsspixii (Agassiz, 1829), durante o ciclo reprodutivo (Macro-and microscopic characterization ofyellow-catfish Cathorops spixii (Agassis, 1829) ovaries during reproductive cycle)

RESUMOObjetivo: Comparar uma série de parâmetros obtidos de dois tratamentos diferentes para uma lesão duodenal complexa (grau III), produzida experimentalmente. Métodos: Foram utilizados 24 cães mestiços, com peso variando entre 10 e 15 kg, divididos em 4 grupos de 6 animais. Em todos os cães provocou-se uma lesão duodenal complexa, grau III, com perda de aproximadamente 50% da sua circunferência, e realizou-se sutura no sentido longitudinal, produzindo alto grau de estenose duodenal. Nos grupos A e C realizou-se apenas a sutura duodenal, enquanto nos grupos B e D, além desta sutura, associou-se o método de exclusão pilórica e gastrojejunostomia, como método de proteção. Os cães dos grupos A e B foram submetidos à eutanásia no 7º dia pós-operatório, e os dos grupos C e D, no 14º dia. Os parâmetros estudados foram os seguintes: perda de peso, índice de estenose duodenal, evolução da cicatrização duodenal, ocorrência de vômitos, incidência de fístulas ou abscessos intracavitários e incidência de óbitos. Resultados: O tratamento com sutura simples mostrou-se mais eficaz, no presente estudo, já que proporcionou menor perda de peso e menor incidência de vômitos entre os animais, além de ser um procedimento menos traumático. Não houve diferenças quanto ao índice de estenose duodenal, processo cicatricial da sutura duodenal, incidência de fístula, abscesso intracavitário ou, mesmo, morte entre os dois tratamentos. demonstrando que a exclusão pilórica e gastrojejunostomia não ofereceram vantagens quanto a sua aplicação. Conclusão: A sutura duodenal associada à exclusão pilórica e gastrojejunostomia proporcionou maior perda média de peso e maior incidência de vômitos entre os cães; o processo cicatricial da área duodenal suturada foi semelhante entre os dois tratamentos; ambos os tratamentos proporcionaram aumento médio dos índices de estenose duodenal semelhantes; não houve casos de deiscência de sutura, fístula, abscesso intra-abdominal, ou morte, relacionados diretamente aos tipos de tratamento; todos os animais submetidos ao fechamento pilórico apresentaram-no

Purpose: This study evaluated the inflammatory reaction caused by the implantation of iodoform and calcium hydroxide in the back of rats. These drugs may be used as intracanal dressings to eliminate residual bacteria of the root canal system. Methods: Twenty albinic rats (Rattus norvegicus, var Wistar) were divided into four groups: control group 1 (CG1) had normal skin; control group 2 (CG2) had wounded tissue without drugs; in groups 3 and 4, iodoform (IG) and calcium hydroxide (CHG) were inserted into the wounds, respectively. After 3, 5 and 11 days, slices of the implanted areas were macroscopically and microscopically observed regarding to their qualitative and quantitative aspects.Results: In the macroscopical analysis, the CHG showed a large area of necrosis and swelling, which progressively decreased; in the IG the presence of iodoform surrounded by normal tissue was observed. The qualitative and quantitative histological analysis showed that IG promoted a shorter delay in the inflammatory response than the CHG.Conclusion: The inflammatory reaction for iodoform had a peak period five days after the drug insertion. By comparison, calcium hydroxide showed a very large area of necrosis that could only be partially eliminated after eleven days.Key words: Calcium hydroxide; Endodontics; inflammation; iodoform ResumoObjetivo: O objetivo deste estudo foi avaliar a resposta inflamatória causada pela implantação do iodofórmio ou hidróxido de cálcio em dorso de ratos. Estas drogas podem ser usadas como curativo intracanal para eliminar bactérias residuais do sistema de canal radicular.Metodologia: Foram utilizados 20 ratos albinos (Rattus norvegicus, var Wistar) e divididos em 4 grupos: grupo controle 1 (CG1) representado por tecido normal íntegro; grupo controle 2 (CG2) com ferida e sem medicação; nos grupos 3 e 4, Iodofórmio (IG) e hidróxido de cálcio (CHG) foram, respectivamente, inseridos nas feridas. Após três, cinco e onze dias, cortes microscópicos das áreas implantadas foram observados macroscópica e microscopicamente quanto a seus aspectos qualitativos e quantitativos.Resultados: Na análise macroscópica, o CHG mostrou uma grande área de necrose e edema, o que diminuiu progressivamente, no GI, a presença de iodofórmio rodeada por tecido normal foi observado. A análise qualitativa e quantitativa histológica mostrou que IG promoveu um prazo mais curto na resposta inflamatória do que o CHG.Conclusão: A reação inflamatória de iodofórmio teve um período de pico de cinco dias após a inserção de drogas. Em comparação, o hidróxido de cálcio mostrou uma grande área de necrose que só poderia ser parcialmente eliminada após onze dias.

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SummaryUntil now studies in Brazil of the pathological action of Contracaecum sp. larvae in Hoplias malabaricus have been rare. The aim of the present study was to analyze and describe histopathological changes in the stomach of H. malabaricus caused by different intensities of infection by larvae of Contracaecum sp., and the hematological effects of such infection. The mean intensity of infection by L3 larvae of Contracaecum sp. correlated positively with Hematocrit percentage (Hct%) and correlated negatively with mean corpuscular volume (MCV). These fi ndings are possibly related to the passage of larvae from the stomach to the mesentery, potentially due to hemorrhaging t. Fish with high infection intensity had larvae of Contracaecum sp in the submucosal of the stomach, which caused destruction of Type I and Type III collagen (fi ner and more delicate collagen fi bers which do not form beams and are permeated by fundamental substances) around the parasite. Microscopic analysis showed that crypts were arranged regularly throughout the stomach mucosal, varying in number, size and depth, depending on the region of the stomach.

PURPOSE: To analyse histopathological alterations characterized by the mitotic index in the mucosa of the large intestine in Wistar rats submitted to jejunoileal bypass operation after continued administration of sodium nitrite and vitamin C to different groups. METHODS: Eighty male Wistar rats were employed and separated into 12 groups. In the control group (20 rats): five animals ingested only water; five animals received vitamin C; five animals received sodium nitrite and five received sodium nitrite + vitamin C. In the sham group (20 rats), the animals were anesthetized and underwent midline laparotomy and only intestinal manipulation was performed: five animals ingested only water; five animals received vitamin C; five animals received sodium nitrite and five received sodium nitrite + vitamin C. In the operated group 40 rats underwent a jejunoileal bypass surgery: ten animals ingested only water; ten animals received vitamin C; ten animals received sodium nitrite and ten received sodium nitrite + vitamin C. The mean weight of the animals was measured weekly. The large intestine was subdivided into cecum (S1), ascending colon (S2), transverse colon (S3), descending colon (S4) and rectum (S5) for histopathological analysis and mitotic counts. The statistical analysis was used to compare the mitotic indices. The level of significance was 5%. RESULTS: The mean of all the segments indicates that the sodium nitrite+vitamin C group obtained the lowest mitotic index compared to the other treatments in the control group. The segments S1 and S2 showed a statistical difference with the vitamin C treatment: a higher mitotic index and better preservation of the mucosa in the operated group. In the sham group the main statistical difference occurred only in the sodium nitrite+vitamin C group between the means of the segments. CONCLUSIONS: The comparison of all the colonic segments of the various groups revealed a lower mitotic index in the animals treated with sodium nitrite+vitamin C. In addition, it was found that vitamin C did not present a statistically significant inhibiting effect on the preservation of the mucosa and the mitotic index.

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