Neurectomia digital em eqüinos: comparação das técnicas guilhotina e stripping

Compararam-se as dificuldades transcirúrgicas e as complicações pós-operatórias das técnicas guilhotina (TG) e stripping (TS) para a neurectomia digital em eqüinos. Sob anestesia com halotano, quatro éguas tiveram os nervos digitais de um dos membros torácicos e um dos pélvicos submetidos à TG, enquanto os nervos digitais dos membros colaterais foram submetidos à TS. Os tempos cirúrgicos médios de TG e TS foram semelhantes. O comprimento médio do fragmento do nervo removido foi três vezes maior em TS (P<0,001). Independente da técnica utilizada, houve perda total da sensibilidade nos talões de todos os membros dentro dos quatro primeiros meses da cirurgia. Após 14 meses, houve retorno da sensibilidade em 37% dos membros em TG e 18,8% em TS (P=0,06). Ao exame de palpação para identificação de neuromas dolorosos, houve episódios de sensibilidade discreta em um maior número de cotos nervosos proximais operados com TS, 53,6% contra 6,4% dos operados com TG (P=0,003). Ambas as técnicas foram satisfatórias por não apresentarem maiores complicações durante ou após a cirurgia. Considerou-se que TG apresentou menor potencial para produzir reinervação e neuromas dolorosos.

Avaliação macroscópica, microscópica e histomorfométrica do tecido cicatricial pós-cirúrgico de eqüinos submetidos a duas técnicas de neurectomia digital

Avaliou-se macro e microscopicamente o tecido cicatricial pós-operatório de eqüinos submetidos a duas técnicas de neurectomia digital: guilhotina (TG) e stripping (TS). Decorridos 14 meses das cirurgias, foram colhidas 32 amostras de tecido cicatricial em quatro éguas, que tiveram os membros submetidos a ambas as técnicas. À macroscopia, verificaram-se as dimensões da cicatriz do coto proximal e a distância entre os cotos proximal e distal. À microscopia, foi quantificada a proporção de tecido nervoso regenerado por meio de histomorfometria. Não houve diferença nas dimensões do tecido cicatricial, contudo a distância entre cotos foi 5,6 vezes maior na TS (P<0,001). Histologicamente, observou-se a presença de tecido conjuntivo frouxo e denso, macrófagos e fibras nervosas delgadas em ambas as técnicas cirúrgicas. Estruturas nodulares, compostas por fascículos nervosos, foram visualizadas em 56,2% (9/16) das amostras colhidas em nervos submetidos à TS. As porcentagens médias de tecido nervoso no tecido cicatricial foram de 0,31% na TG e 2,6% na TS (P<0,001). Concluiu-se que o retorno à sensibilidade nervosa deve demorar mais a ocorrer após a TS, devido à maior distância entre cotos. A maior proporção de tecido nervoso sugere que essa técnica favorece a regeneração nervosa.

Alterações morfométricas no plexo mioentérico do cólon menor equino distendido experimentalmente

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Peritoneal fluid changes in horses subjected to small colon distension

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Enterorrafias em plano aposicional convencionale com adesivo à base de cianoacrilato no cólon descendente de eqüinos

Em eqüinos, as enterotomias no cólon descendente são necessárias para remover enterólitos, corpos estranhos e material alimentar compactado que não podem ser removidos por técnicas conservativas. Este segmento intestinal possui um suprimento sangüíneo pobre, além de predisposição a complicações pós-operatórias relacionadas à contaminação bacteriana. Assim, este estudo foi conduzido com o objetivo de efetuar avaliações clínicas e anatomopatológicas do emprego de adesivo tecidual à base de cianoacrilato no cólon descendente de eqüinos, comparando-o a uma técnica de sutura aposicional convencional. A intervenção cirúrgica foi realizada em 15 animais posicionados em decúbito lateral direito, através de laparotomia pelo flanco esquerdo, sob anestesia geral inalatória. Após a exteriorização do cólon descendente, foram realizadas duas enterotomias de cinco centímetros de extensão cada, distanciadas 20cm uma da outra. Os animais foram aleatoriamente distribuídos em cinco tempos de observação de três animais cada e sacrificados aos três, sete, 14, 35 e 70 dias de pós-operatório. O adesivo butil-2-cianoacrilato e o fio de poliglactina 910 mostraram-se igualmente apropriados para uso em enterorrafias desse órgão, sendo que o fio de poliglactina 910 provocou inflamação inicial mais intensa que o cianoacrilato e, mais tardiamente, ambos causaram inflamação granulomatosa do tipo corpo estranho observada, primeiramente, junto ao fio de poliglactina 910 (7º dia) e, a partir do 35º dia, ao redor do cianoacrilato.

Corrective shoeing in horses: analysis of the adaptation period to the new condition imposed

O ferrageamento corretivo é um método comumente ma Dvideow. O nível de significância adotado foi de 5%. No utilizado para alterar o padrão do andamento dos animais, presente estudo, não houve diferença significativa entre os assim como na terapêutica de diversas afecções do siste-dias avaliados, a elevação em seis graus da pinça ou talões ma locomotor dos equinos. No entanto, não existem, até não gerou desconforto durante a passada, portanto, os ani o momento, estudos científicos que revelem o período de mais podem retornar às atividades regulares de exercício e adaptação do andamento dos animais a este tipo de in-treinamento imediatamente após o ferrageamento. tervenção.O objetivo deste estudo foi avaliar o período de adaptação à ferraduras com elevação em seis graus da pinça ou talões em equinos caminhando em esteira rolante. O período de adaptação à ferradura foi avaliado nos tempos 0, 48 e 96 horas após cada tipo de ferrageamento proposto. Os animais foram gravados caminhando em esteira rolante. O comprimento da passada e a análise qualitativa do andamento foram realizados com o auxílio do programa Dvideow. O nível de significância adotado foi de 5%. No presente estudo, não houve diferença significativa entre os dias avaliados, a elevação em seis graus da pinça ou talões não gerou desconforto durante a passada, portanto, os animais podem retornar às atividades regulares de exercício e treinamento imediatamente após o ferrageamento.

Avaliação histomorfométrica e ultra-estrutural da mucosa do cólon menor eqüino submetido a distensão

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Equine chronic proliferative synovitis (villonodular synovitis): clinical, radiographic and ultrasonographic aspects: relate of case

Doria, R.G.S.; Canola, P.A.; Freitas, S.H. & Canola, J.C. [Equine chronic proliferative synovitis (villonodular synovitis): clinical, radiographic and ultrasonographic aspects: Relate of case.] Sinovite proliferativa cronica (sinovite vilonodular) em equino: aspectos clinicos, radiograficos e ultra-sonograficos: Relato de caso. Revista Brasileira de Medicina Veterinciria 30(3):157-161, 2008. Departamento de Cirurgia, Faculdade de Medicina Veterinaria, Universidade de Cuiaba, UNIC, Av. Antartica 788, Casa 26, Residencial Villas Boas, Ribeirao da Ponte, Cuiaba, MT 78040-500. Brasil. E-mail: redoria@uol.com.brThe development of intracapsullar masses at the dorsal aspect of the metacarpofalangeal joint for a period of several months is commonly secondary to the chronic synovitis. Although it is known as villonodular synovitis in horses probably is better to refer it as chronic proliferative synovitis. The most common causes are the non-treated osteocondral fractures of the dorsal portion of the proximal phalanx. In addition, the development of villonodular masses follows the degenerative process in the joint. A case of a lame animal is reported at the present study. The correct diagnosis and the adequate therapeutic propositions were given based on the clinical examination, therapeutic local-anesthetic test and radioghaphic and ultrasonographic imaging exams. The development of a criterious identification of this disease must be based on clinical findings, radiographic and ultrasonographic exams which assume fundamental importance to the treatment and prognostic. The aim of this study is to describe the clinical, radiographic and ultrasonographic findings' allowing the identification and diagnosis of chronic proliferative synovitis at the thoracic metacarpofalangeal joint in the horse.

Long-term facial artery catheter implantation for serial arterial blood sampling and invasive arterial blood pressure measurement in horses

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Effects of hypercapnic hyperpnea on recovery from isoflurane or sevoflurane anesthesia in horses

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Preliminary study on age- and sex-dependent alterations in the composition of skeletal muscle fibers of Brasileiro de Hipismo horses

The aim of this work was to characterize the distribution of myofibers in the gluteus medius muscle of inactive horses of the Brasileiro de Hipismo (BH) breed at different ages by means of histochemical analyses, according to sex and depth of the biopsy. A total of 78 inactive horses (9 castrated males, 35 stallions, and 34 females) of the BH breed, aged 1 to 4 years, were used. A percutaneous muscle biopsy was obtained with a 6.0-mm Bergstrom-type needle, which allowed the removal of muscle fragments at depths of 20 and 60 mm. Myofiber types were determined based on myofibrillar adenosine triphosphatase (mATPase) and nicotinamide dinucleotide tetrazolium reductase (NADH-TR) techniques. Morphometry of the fibers was determined based on cross-sectional area (CSA), mean frequency (F), and relative cross-sectional area (RCSA). The current study demonstrated that BH horses 3 and 4 years of age show a greater percentage of, and area occupied by, type IIA fibers and lower percentage of type IIX fibers in the gluteus medius muscle compared with horses 1 and 2 years of age. No difference was found between sexes in the frequency of and area occupied by the different fiber types at any of the depths and ages studied. In this study, females showed a greater CSA for all fibers in comparison with males, at 1 year of age. The results of the current study indicate that the gluteus medius muscle of inactive BH horses shows modifications in its structural and biochemical composition during the growth of the animals, leading to a better oxidative capacity.

Alterações morfológicas de tecido laminar do casco e parâmetros clínicos e laboratoriais de equinos com síndrome cólica letal

As afecções gastrintestinais dos cavalos são agravadas por complicações como a laminite, cuja etiopatogenia está relacionada à degradação da membrana basal do tecido laminar por metaloproteinases (MMPs). A ativação das MMPs pode ocorrer devido à liberação local de citocinas inflamatórias ou enzimas provenientes de leucócitos infiltrados no tecido laminar. O objetivo deste trabalho foi avaliar as alterações morfológicas do tecido laminar de equinos com síndrome cólica letal e sua provável associação com parâmetros clínicos e laboratoriais. Observou-se intensa destruição da arquitetura laminar, principalmente nos animais com alterações físicas e laboratoriais mais acentuadas, como tempo de preenchimento capilar prolongado (TPC), membranas mucosas congestas, taquicardia, hemoconcentração e redução nas contagens de plaquetas e leucócitos. Os resultados sinalizam o provável momento do desenvolvimento de lesões do tecido laminar em equinos com síndrome cólica, no qual é possível adotar medidas preventivas contra a laminite.

Técnica para avaliação da pressão arterial pulmonar de equinos durante o exercício progressivo em esteira rolante

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Eficácia da imunoterapia no tratamento de pitiose facial em equino

Background: Pythiosis in horses is a proliferative and ulcerative disease that primarily affects the skin and subcutaneous tissue of limbs, thoracic-abdominal region and head. This disease sometimes can also affect limb bones or cause tumoral masses in abdomen. Usually, the cutaneous cases are confused with habronemiasis. The disease is more common in marshy areas, places with formation of slow drainage ponds and aquatic vegetation under high temperatures. The aim of this study was to describe the development of facial lesions in a horse caused by pythiosis in Cuiaba, Mato Grosso, and, additionally to discuss relevant issues regarding the diagnosis, clinical course and response to immunotherapy treatment.Case: One five years old mare of unknown breed, created in property located in the Cerrado region, had a wound on its face difficult to be healed and non-responsive to several treatments based on ivermectin and organophosphate administrated by either topical or systemic via. The animal was assisted on the farm of origin by the veterinary team of the Clinical Medicine sector, of the Veterinary Hospital, Universidade Federal de Mato Grosso (HOVET-UFMT). on the occasion of the visit, which occurred 60 days after onset of signs, the animal showed a circular single large lesion, ulcerative with serous discharge on the right part of its face, between the eyes and nostrils. There were some necrotic foci with sinus, from which kunkers were extracted; a condition compatible with pythiosis. The diagnosis was confirmed by histology, ELISA and PCR.Discussion: Assuming pythiosis from data obtained from the survey and profile of the lesion (secretory aspect, emaciation and presence of sinus and kunkers), immunotherapy treatment was immediately applied. The advanced clinical aspects and the fact that early diagnosis and treatment are essentials to satisfactory therapeutic response were also taken into consideration for starting the treatment. The remission of signs was achieved after five subcutaneous applications with 14 days between each application. From the second application, it was observed clinical improvement and after 60 days of treatment there was almost complete remission of signs. The signs for a satisfactory response in the injury site followed the order of decreasing secretory aspect, decreasing borders, decrease the itching and bringing the edges together with the formation of a thin layer of crust on the surface. Pythiosis cases with lesions on the face and lower abdomen are commonly confused with habronemiasis by macroscopic and widespread similarity between technicians and attendants, and essential support to the diagnosis through laboratory tests, which in turn are still underutilized. In this case, the authors demonstrated the therapeutic efficacy of immunotherapy as an advantage, considering the possibility of applying it in cases of lesions in areas of difficult surgical access, treatment conditions in the field, with low cost and ease of application. Further studies approaching this alternative therapy are necessary, since side effects have been observed in some cases.

Pitiose cutânea equina de localização atípica tratada topicamente com solução de anfotericina B e DMSO

Background: Cutaneous lesions by Pythium insidiosum infection are commonly observed in horses, especially in those living at flooded environments. Equine pythiosis is characterized by the development of tumoral masses that are frequently located at distal limbs, ventral abdomen, thorax, breast and face. The lesions are usually granulomatous, serosanguineous and ulcerated, most often destroyed by self-mutilation due to the intense pruritus. The proposed treatment includes surgical excision followed by antifungal drugs administration, which can be done systemically or topically. Amphotericin B and dimethyl sulfoxide (DMSO) in association has been successfully used for cutaneous pythiosis topical treatment due to the DMSO property to carry any substance through plasmatic membranes.Case: The present report concerns a 12-year-old mixed breed gelding presenting with self-mutilation of a tumoral mass located at the left flank. The owners reported that the horse had initially presented a small wound that had evolved to a 20-cm in diameter mass in 4 weeks. Tissue samples were collected, processed and stained by the Gomori's methenamine silver (GMS) method. The histopathological analysis revealed Pythium insidiosum hyphae in a granulomatous tissue, especially located at peripheral region, where kunkers were present. Surgical excision of the mass followed by cauterization was indicated as initial treatment, and due to financial reasons, the owners elected only the topical antifungal therapy to control the fungus infection after surgery. Flunixin meglumine was also administrated for five days aiming the control of pain and inflammation. The wound was cleaned with povidone-iodine solution and rinsed with a solution containing, 50 mg, of amphotericin B in 10 mL of sterile water and 10 mL of DMSO. This procedure was carried Out twice a day. The wound healed fast due to an excellent centripetal epithelialization. and the horse was discharged after 64 days showing only 5% of the initial wound area. The owner reported by telephone the complete healing and hair growth 10 days after discharge.Discussion: Despite the atypical location of the tumoral lesion described at the present report, the history and clinical manifestations, especially the intense pruritus, showed similarity with other characteristic reports of equine cutaneous pythiosis. The diagnosis was confirmed by the histopathological examination showing hyphae structures, as described to be evidences of the presence of Pythium insidiosum in the tissue. The surgical procedure was the first step to provide remission of clinical signs, and one day after surgery the pruritus desapeared. After excision of the granulomatous tissue and cauterization, daily topical administration of amphotericin B associated with DMSO was effective in destroying the infectious agent, as observed by the excellent epithelization. A pink granulation tissue grew up providing an ideal surface for epithelial migration and the healing process progressed quickly. Centripetal epithelialization reduced the wound area until 3% of the initial area in 64 days of treatment, when the remaining wound was found almost completely healed and covered with hair. At the present report, the horse presenting pythiosis was only topically treated. The recommended therapy using amphotericin B and DMSO solution was effective, economically viable and low risk, considering that the systemic antifungal therapy usually suggested is expensive and extremely nephrotoxic. The atypical location of the lesion on the left flank shows that any anatomical region can be affected by the fungus, since the conditions for its development were present.