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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Espondilectomia parcial ventral cervical com osteotomia piezoelétrica e convencional em coelhos (Oryctolagus cuniculus) / Cervical ventral partial spondilectomy with piezoeletric and conventional osteotomy in rabbits (Oryctolagus cuniculus)

Roscamp, Marcelo 09 October 2017 (has links)
Submitted by Marcelo Roscamp (marcelo@ortopediapet.com) on 2017-11-16T13:57:30Z No. of bitstreams: 1 Dissertação_Marcelo_Roscamp.pdf: 9443012 bytes, checksum: 69bacbdda807a3e9fee0f785465385c3 (MD5) / Submitted by Marcelo Roscamp (marcelo@ortopediapet.com) on 2017-11-22T14:06:58Z No. of bitstreams: 1 Dissertação_Marcelo_Roscamp.pdf: 9443012 bytes, checksum: 69bacbdda807a3e9fee0f785465385c3 (MD5) / Submitted by Marcelo Roscamp (marcelo@ortopediapet.com) on 2017-11-22T18:09:13Z No. of bitstreams: 1 Dissertação_Marcelo_Roscamp.pdf: 9443012 bytes, checksum: 69bacbdda807a3e9fee0f785465385c3 (MD5) / Submitted by Marcelo Roscamp (marcelo@ortopediapet.com) on 2017-11-22T18:12:23Z No. of bitstreams: 1 Dissertação_Marcelo_Roscamp.pdf: 9443012 bytes, checksum: 69bacbdda807a3e9fee0f785465385c3 (MD5) / Submitted by Marcelo Roscamp (marcelo@ortopediapet.com) on 2017-11-22T19:44:21Z No. of bitstreams: 1 Dissertação_Marcelo_Roscamp.pdf: 9443012 bytes, checksum: 69bacbdda807a3e9fee0f785465385c3 (MD5) / Submitted by Marcelo Roscamp (marcelo@ortopediapet.com) on 2017-11-23T11:57:14Z No. of bitstreams: 1 Dissertação_Marcelo_Roscamp.pdf: 9443012 bytes, checksum: 69bacbdda807a3e9fee0f785465385c3 (MD5) / Submitted by Marcelo Roscamp (marcelo@ortopediapet.com) on 2017-11-23T12:57:56Z No. of bitstreams: 1 Dissertação_Marcelo_Roscamp.pdf: 9443012 bytes, checksum: 69bacbdda807a3e9fee0f785465385c3 (MD5) / Submitted by Marcelo Roscamp (marcelo@ortopediapet.com) on 2017-11-23T13:16:32Z No. of bitstreams: 1 Dissertação_Marcelo_Roscamp.pdf: 9443012 bytes, checksum: 69bacbdda807a3e9fee0f785465385c3 (MD5) / Submitted by Marcelo Roscamp (marcelo@ortopediapet.com) on 2017-11-23T13:34:44Z No. of bitstreams: 1 Dissertação_Marcelo_Roscamp.pdf: 9443012 bytes, checksum: 69bacbdda807a3e9fee0f785465385c3 (MD5) / Submitted by Marcelo Roscamp (marcelo@ortopediapet.com) on 2017-11-23T17:24:55Z No. of bitstreams: 1 Dissertação_Marcelo_Roscamp.pdf: 9443012 bytes, checksum: 69bacbdda807a3e9fee0f785465385c3 (MD5) / Submitted by Marcelo Roscamp (marcelo@ortopediapet.com) on 2017-11-23T17:29:02Z No. of bitstreams: 1 Dissertação_Marcelo_Roscamp.pdf: 9443012 bytes, checksum: 69bacbdda807a3e9fee0f785465385c3 (MD5) / Submitted by Marcelo Roscamp (marcelo@ortopediapet.com) on 2017-11-24T12:05:24Z No. of bitstreams: 1 Dissertação_Marcelo_Roscamp.pdf: 9443012 bytes, checksum: 69bacbdda807a3e9fee0f785465385c3 (MD5) / Submitted by Marcelo Roscamp (marcelo@ortopediapet.com) on 2017-11-24T12:39:44Z No. of bitstreams: 1 Dissertação_Marcelo_Roscamp.pdf: 9443012 bytes, checksum: 69bacbdda807a3e9fee0f785465385c3 (MD5) / Submitted by Marcelo Roscamp (marcelo@ortopediapet.com) on 2017-11-24T16:47:38Z No. of bitstreams: 1 Dissertação_Marcelo_Roscamp.pdf: 9443012 bytes, checksum: 69bacbdda807a3e9fee0f785465385c3 (MD5) / Submitted by Marcelo Roscamp (marcelo@ortopediapet.com) on 2017-11-24T17:31:22Z No. of bitstreams: 1 Dissertação_Marcelo_Roscamp.pdf: 9443012 bytes, checksum: 69bacbdda807a3e9fee0f785465385c3 (MD5) / Submitted by Marcelo Roscamp (marcelo@ortopediapet.com) on 2017-11-27T11:40:50Z No. of bitstreams: 1 Dissertação_Marcelo_Roscamp.pdf: 9443012 bytes, checksum: 69bacbdda807a3e9fee0f785465385c3 (MD5) / Submitted by Marcelo Roscamp (marcelo@ortopediapet.com) on 2017-11-27T12:31:51Z No. of bitstreams: 1 Dissertação_Marcelo_Roscamp.pdf: 9443012 bytes, checksum: 69bacbdda807a3e9fee0f785465385c3 (MD5) / Submitted by Marcelo Roscamp (marcelo@ortopediapet.com) on 2017-11-27T13:03:15Z No. of bitstreams: 1 Dissertação_Marcelo_Roscamp.pdf: 9443012 bytes, checksum: 69bacbdda807a3e9fee0f785465385c3 (MD5) / Submitted by Marcelo Roscamp (marcelo@ortopediapet.com) on 2017-11-27T18:08:07Z No. of bitstreams: 1 Dissertação_Marcelo_Roscamp.pdf: 9443012 bytes, checksum: 69bacbdda807a3e9fee0f785465385c3 (MD5) / Submitted by Marcelo Roscamp (marcelo@ortopediapet.com) on 2017-11-28T12:13:08Z No. of bitstreams: 1 Dissertação_Marcelo_Roscamp.pdf: 9443012 bytes, checksum: 69bacbdda807a3e9fee0f785465385c3 (MD5) / Submitted by Marcelo Roscamp (marcelo@ortopediapet.com) on 2017-11-28T14:22:46Z No. of bitstreams: 1 Dissertação_Marcelo_Roscamp.pdf: 9443012 bytes, checksum: 69bacbdda807a3e9fee0f785465385c3 (MD5) / Submitted by Marcelo Roscamp (marcelo@ortopediapet.com) on 2017-11-28T14:31:56Z No. of bitstreams: 1 Dissertação_Marcelo_Roscamp.pdf: 9443012 bytes, checksum: 69bacbdda807a3e9fee0f785465385c3 (MD5) / Submitted by Marcelo Roscamp (marcelo@ortopediapet.com) on 2017-11-28T14:37:45Z No. of bitstreams: 1 Dissertação_Marcelo_Roscamp.pdf: 9443012 bytes, checksum: 69bacbdda807a3e9fee0f785465385c3 (MD5) / Submitted by Marcelo Roscamp (marcelo@ortopediapet.com) on 2017-11-28T19:04:28Z No. of bitstreams: 1 Dissertação_Marcelo_Roscamp.pdf: 9443012 bytes, checksum: 69bacbdda807a3e9fee0f785465385c3 (MD5) / Submitted by Marcelo Roscamp (marcelo@ortopediapet.com) on 2017-11-30T18:58:21Z No. of bitstreams: 1 Dissertação_Marcelo_Roscamp.pdf: 9443012 bytes, checksum: 69bacbdda807a3e9fee0f785465385c3 (MD5) / Submitted by Marcelo Roscamp (marcelo@ortopediapet.com) on 2017-12-04T14:43:23Z No. of bitstreams: 1 Dissertação_Marcelo_Roscamp.pdf: 9443012 bytes, checksum: 69bacbdda807a3e9fee0f785465385c3 (MD5) / Submitted by Marcelo Roscamp (marcelo@ortopediapet.com) on 2017-12-05T14:11:15Z No. of bitstreams: 1 Dissertação_Marcelo_Roscamp.pdf: 9443012 bytes, checksum: 69bacbdda807a3e9fee0f785465385c3 (MD5) / Submitted by Marcelo Roscamp (marcelo@ortopediapet.com) on 2017-12-11T18:47:11Z No. of bitstreams: 1 Dissertação_Marcelo_Roscamp.pdf: 9443012 bytes, checksum: 69bacbdda807a3e9fee0f785465385c3 (MD5) / Approved for entry into archive by Alexandra Maria Donadon Lusser Segali null (alexmar@fcav.unesp.br) on 2017-12-13T12:16:42Z (GMT) No. of bitstreams: 1 roscamp_m_me_jabo.pdf: 9443012 bytes, checksum: 69bacbdda807a3e9fee0f785465385c3 (MD5) / Made available in DSpace on 2017-12-13T12:16:42Z (GMT). No. of bitstreams: 1 roscamp_m_me_jabo.pdf: 9443012 bytes, checksum: 69bacbdda807a3e9fee0f785465385c3 (MD5) Previous issue date: 2017-10-09 / A cirurgia piezoelétrica ou piezocirurgia é utilizada há várias décadas, porém em medicina veterinária são escassos os artigos publicados utilizando esta modalidade em cirurgias descompressivas da coluna vertebral de cães e gatos. Assim, aventou-se com esse trabalho investigar a aplicabilidade da mesma na realização da espondilectomia parcial ventral cervical (EPVC), comparando-a com a técnica convencional que utiliza brocas esféricas de alta rotação para o desgaste ósseo, utilizando o coelho (Oryctolagus cuniculus) como modelo experimental de cães e gatos. Para tanto foi utilizado o aparelho médico Mastersonic®, que possui duas peças de mão, uma piezoelétrica com ponteira ultrassônica tipo cinzel delicado (T1) e na outra, motor de alta rotação com brocas esférica de 2 mm (técnica convencional) (T2). A EPVC foi realizada entre a terceira e quarta vértebras cervicais e cada técnica foi realizada em 15 animais, devidamente anestesiados, os quais foram avaliados quanto à duração de cada etapa da cirurgia, variações de temperatura durante a execução da EPVC, visibilidade do campo cirúrgico, complicações trans e pós-operatórias e monitoração anestésica. Aos 14, 28 e 56 dias de pós-operatório (PO), cinco animais de cada tratamento foram submetidos à eutanásia e realizado estudo histopatológico do local da cirurgia, avaliando à resposta inflamatória, à cicatrização óssea e as lesões medulares. Os resultados mostraram que T1 demandou mais tempo para a execução da curetagem e maior perda de temperatura no foco cirúrgico durante a cirurgia. O tempo de acesso cirúrgico reduziu progressivamente em torno de 50% até o oitavo procedimento de cada tratamento (T1 e T2), e após isso se manteve com a mesma duração nos dois tratamentos. O tempo de uso do aparelho foi mais homogêneo em T1 e diminuiu progressivamente em T2, mas ao avaliar o tempo total da técnica de EPVC, não houve diferença entre os tratamentos. O T1 proporcionou melhor visibilidade do campo cirúrgico, com apenas um caso de sangramento ósseo, contra seis casos em T2. Observaram-se quatro casos de hemorragia de seio venoso vertebral durante a curetagem no T1 e dois casos no T2. Também ocorreram três casos de déficits proprioceptivos transitórios, com duração de até 72 horas no T1. A temperatura corporal e a taxa de uso do isoflurano decaíram com o tempo nos dois tratamentos, assim como a frequência cardíaca em T1. No estudo histopatológico observou-se resposta inflamatória mais ativa em T1 aos 14 dias de PO, porém aos 28 e 56 dias de PO foi semelhante entre os tratamentos, assim como a cicatrização óssea. Ainda houve mais lesões medulares com a piezocirurgia (T1), principalmente aos 14 e 28 dias de PO, com presença de malácia, esferócitos e células “Gitter”. Enquanto que na técnica convencional (T2), notou-se discreta degeneração Walleriana, apenas aos 14 dias de PO. Conclui-se que a piezocirurgia é aplicável na realização da EPVC com excelente visibilidade do campo operatório, facilidade de manuseio e rápida curva de aprendizagem, no entanto, demandou maior tempo para execução da espondilectomia e provocou mais complicações cirúrgicas e de lesões medulares, quando comparada à técnica convencional. / Piezoelectric surgery or piezosurgery has been used for several decades, but in veterinary medicine, articles published using this modality in decompressive surgery of the spine of dogs and cats are scarce. The aim of this study was to investigate the applicability of this technique to the performance of cervical ventral partial spondylectomy (CVPS), comparing it with the conventional technique using high-rotation spherical drills for bone wear using rabbit (Oryctolagus cuniculus) as an experimental model of dogs and cats.. For this was used Mastersonic® medical device that has two hand pieces, one piezoelectric type with ultrasonic delicate chisel tip (T1) and the other, high speed engine with spherical drills 2 mm (conventional technique) (T2). The CVPS was held between the third and fourth cervical vertebrae and each technique was performed on 15 animals, under anesthesia, which were evaluated for the duration of each stage of surgery, temperature variations during the execution of CVPS, the surgical field visibility, trans and postoperative complications and anesthetic monitoring. At 14, 28 and 56 postoperative days (PO), five animals per treatment were euthanized, and histological studies were carried to the surgical site by assessing the inflammatory response, and bone healing spinal injuries. The results showed that T1 required more time for curettage execution and highest loss of temperature at the surgical focus during surgery. Surgical access time progressively reduced by 50% until the eighth procedure of each treatment (T1 and T2), and after that it remained the same duration in both treatments. The time of use of the device was more homogeneous in T1 and progressively decreased in T2, but when evaluating the total time of the CVPS technique, there was no difference between treatments. The T1 provided better visibility of the surgical field, with only one case of bone bleeding, against six cases in T2. Four cases of vertebral venous sinus hemorrhage were seen during curettage in T1 and two cases in T2. There were also three cases of transient proprioceptive deficits, lasting up to 72 hours in T1. Body temperature and the rate of use of isoflurane declined over time in both treatments, as did heart rate in T1. Histopathological study there was more active inflammatory response in T1 at 14 days postoperatively, but after 28 and 56 days postoperatively was similar among treatments, as well as to bone healing. There were still more spinal cord injuries with the piezosurgery (T1), especially at 14 and 28 days of PO, with presence of malacia, spherocytes and Gitter cells. While the conventional technique (T2), it was noted discrete Wallerian degeneration, only at 14 days postoperatively. It is concluded that the piezosurgery is applicable in the performance of the CVPS with excellent visibility of the operative field, ease of handling and rapid learning curve, however, demanded more time for the execution of the spondylectomy and caused more surgical complications and spinal cord injuries, when compared to the conventional technique.
2

Quimionucleólise cervical associada à fenda ventral em cães: avaliação clínico-cirúrgica, radiográfica e histológica / [Chemonucleolysis of canine cervical intervertebral disks associated with ventral slots: Clinical-surgical, radiological and histological aspects]

Daibert, Ana Paula Falci 13 August 2004 (has links)
Made available in DSpace on 2015-03-26T13:46:43Z (GMT). No. of bitstreams: 1 texto completo.pdf: 1498735 bytes, checksum: e65541cd95115cdcb1835feee29a3615 (MD5) Previous issue date: 2004-08-13 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / The present study has as objectives to evaluate the clinical-surgical, radiological and histological aspects of canine cervical intervertebral disks after chemonucleolysis with chymopapain associated to the ventral slot. For that, it was used 24 dogs randomly divided into six equal groups. The ventral slot was accomplished in the area of the intervertebral disk C2-C3 and chemonucleolysis in the other cervical disks. Each group of four animals was submitted to euthanasia with an anesthetic overdose 24 hours, eight, 30, 60, 90 and 120 days after the enzyme injection and sagittal sections of the treated disks, associated to adjacent cartilaginous endplates and bony structures were obtained for histological analysis. The dogs were also monitored clinically and radiographically for up to 120 days, according to the groups. In this study, all dogs tolerated the surgical procedure, without detectable postoperative pain, neurological deficit or alteration of the conscience state. In the radiographic evaluation, it was observed consistent disk space narrowing 24 hours after the procedure and total absence of space from the eighth to the 90th day after chemonucleolysis in the area of all treated disks. However, at 120 days of postoperative there was an increase in disk height, corresponding, on average, to 59.13% of the preinjection value. Also, on the 30th day of postoperative, it was noted absorption of the vertebral bodies adjacent to the treated disks that progressed to healing, with evidences of vertebral fusion 120 days after the treatment. In the histological evaluation, it was observed 24 hours after disk injection nuclear digestion, characterized by cavitations and decrease of safranin-O staining intensity, indicating loss of proteoglycans. At eight days, the nuclear content was still vacuolated but more fibrillar. At 30 days, it was noted lesions and hemorrhage in the cartilaginous endplates. An irregularly defined mass in the nuclear space was observed on days 60th and 90th, but it seemed fibrocartilaginous tissue on day 120th. It was also observed microfractures and bone necrosis on day 90th, which were healed by day 120th. Chemonucleolysis with chymopapain associated to the ventral slot in the cervical column of dogs determines lysis of intervertebral disks, cervical instability and lesions of cartilaginous and bone adjacent structures that tend to repair with fibrocartilaginous tissue along the time. / Foram avaliados os aspectos clínico-cirúrgicos, radiográficos e histológicos de discos intervertebrais cervicais após quimionucleólise com quimiopapaína associada à fenda ventral. Foram utilizados 24 cães separados, aleatoriamente, em seis grupos iguais e de acordo com o tempo de observação pós-operatório. A fenda ventral foi realizada na região do disco intervertebral C2-C3 e as quimionucleólises nos demais discos cervicais. Cada grupo de quatro animais foi eutanasiado por sobredose anestésica 24 horas, oito, 30, 60, 90 e 120 dias após aplicação da enzima e foram obtidos cortes sagitais dos discos intervertebrais tratados, associados a estruturas cartilaginosas e ósseas adjacentes, para análise histológica. Os cães foram também avaliados, de acordo com o grupo, clinica e radiograficamente por até 120 dias. Todos os cães toleraram bem o procedimento cirúrgico, não apresentando déficit neurológico, alteração do estado de consciência e dor aparente na região cervical. Na avaliação radiográfica, com 24 horas, observou-se marcada redução da espessura dos espaços intervertebrais. Do oitavo ao 90º dia, foi verificada ausência total de espaço intervertebral na região de todos os discos tratados. Aos 120 dias, entretanto, as espessuras dos espaços intervertebrais correspondiam, em média, a 59,13% da espessura anterior ao procedimento. Ainda, radiograficamente, verificou-se aos 30 dias, absorção das porções dos corpos vertebrais adjacentes aos discos tratados, que progrediu para reparação, inclusive com evidências de fusão vertebral aos 120 dias. Na avaliação histológica, 24 horas após a quimionucleólise, foi observada digestão nuclear caracterizada por cavitações e redução da intensidade de coloração pela safranina-O, indicando perda de proteoglicanos. Aos oito dias, o conteúdo nuclear apresentou-se ainda vacuolizado, contudo mais fibrilar. Aos 30 dias, foram observadas lesões e áreas de hemorragia nas placas terminais cartilaginosas. A partir do 60º dia, notou-se a presença de material amorfo no espaço nuclear, que, aos 120 dias, tinha aparência de tecido fibrocartilaginoso. Aos 90 dias, verificou-se presença de microfraturas e osteonecrose, que estavam reparadas aos 120 dias. A quimionucleólise com quimiopapaína concomitante à fenda ventral na coluna cervical de cães determinou a lise dos discos intervertebrais, instabilidade cervical e lesões nas estruturas cartilaginosas e ósseas adjacentes, que tendem à reparação por tecido fibrocartilaginoso ao longo do tempo. Os trabalhos apresentados como parte integrante desta tese estão seguindo as normas de publicação do Arquivo Brasileiro de Medicina Veterinária e Zootecnia da Universidade Federal de Minas Gerais, indexada ao ISI, AGRIS, BIOSIS, CAB, CAS, MEDLARS e LILACS. ISSN 01020935.

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