Sérgio Amaro Guimarães Fialho

Artrodese do joelho em cães pela fixação externa

Arthrodesis of the stifle joint was performed on seven healthy dogs. The fusion of right or left femorotibial joint was made using external skeletal fixation by placing a transfixation of Steinmann pins that were connected with autopolimerized acrylic bars. Intra-articular structures were removed and ostectomy of articular sur faces of distal femur and proximal tibia were made. After autogenous cancellous bone graft was inserted, immobilization was placed to maintain the selected joint angle measured in the preoperative period. The functional performance was observed and radiographic evaluation was done immediately after surgery, and at 30, 60 and 90 postoperative days. Fusion of the joint was judged by microscopic and macroscopic observations. The external skeletal fixation provided early return to weight-bearing function with satisfactory functional degree. Results of this study indicated that this type of immobilization is entirely satisfactory to produce arthrodesis of the stifle joint.

AVALIAÇÃO DO VOLUME CORRENTE DE AR EM CÃES SUBMETIDOS A TORACOTOMIA EM BLOCO

A frequencia respiratoria e o volume corrente de ar foram medidos em caes submetidos a tecnica de toracotomia em bloco. Os animais foram tranquilizados com acetilpromazina e anestesiados com tiopental sodico, acompanhado de entubacao endotraqueal e utilizacao de mini-respirador automatico a pressao positiva intermitente. Os valores do volume-minuto, frequencia respiratoria e volume corrente foram registrados nos seguintes tempos: antes da inducao de anestesia (T0), no final da cirurgia (T1), 24 horas (T2) e 7 dias depois do termino da cirurgia (T3), respectivamente. Nos animais do grupo II, no final da cirurgia (Tempo 1) e 24 horas apos (Tempo 2), foi feita anestesia local infiltrativa dos nervos intercostais junto das costelas seccionadas para comparacao das provaveis alteracoes da mecânica respiratoria e do volume corrente de ar no periodo pos-operatorio. A tecnica da toracotomia em bloco nao provocou alteracoes da mecânica respiratoria durante o periodo pos-operatorio.

Toracotomia em bloco em cães pré-medicados com acetilpromazina e anestesiados com tiopental sódico: efeitos sobre os gases sangüíneos e equilíbrio ácido-base

Blood gas analysis were measured in dogs submitted to en bloc thoracotomy. Preanesthetic medication consisted of acepromazine maleate injected intravenously. The animal was anesthetized with thiopental sodium intravenously, and the surgical field prepared. The trachea was intubated and mechanical ventilator was used. A radical thoracotomy was performed. Arterial samples of blood were collected from the femoral artery. Arterial blood pH value, carbon dioxide pressure (PCO2), PO2 level, base excess and standard bicarbonato level (HCO3-) were determined. Local anesthesia of intercostal nerves of the thorax, dose to the thoracotomy, were also performed on dogs in group II at end of surgery (T1) and 24 hours (T2) after the surgery. The dog recovered satisfactonly and in the following 7 days had no observable discomfort. It is anticipated that the results of this study will be useful to those using the en bloc thoracotomy, which provided excellent exposure ot the thoracic viscera with no postoperative complications.