RESUMO
The authors evaluated the effects of locally anesthetizing the sciatic and femoral nerves in sheep undergoing stifle (femorotibial) surgery (16 sheep received nerve blocks; 16 sheep underwent a nerve localization procedure but received no nerve blocks). Heart rate, mean arterial blood pressure and end-tidal isoflurane were recorded every 5 min while sheep were anesthetized. At some of the observed time points, the mean heart rate in the sheep that had received no nerve blocks was significantly higher than in the sheep that had received the nerve blocks. Postoperatively, each sheep was assigned scores for comfort and attitude, movement, flock behavior, feeding behavior and appetite and respiratory rate (based on predefined descriptions). Though the authors found no undesirable effects of this local anesthesia, beneficial effects of the nerve blocks were minimal or not readily apparent under the conditions of this study.
Assuntos
Nervo Femoral/efeitos dos fármacos , Bloqueio Nervoso/veterinária , Procedimentos Ortopédicos/veterinária , Nervo Isquiático/efeitos dos fármacos , Carneiro Doméstico/cirurgia , Joelho de Quadrúpedes/cirurgia , Anestesia Local/veterinária , Anestésicos Gerais/farmacologia , Anestésicos Locais/metabolismo , Animais , Comportamento Animal , Bupivacaína/metabolismo , Frequência Cardíaca/efeitos dos fármacos , Isoflurano/farmacologia , Bloqueio Nervoso/métodos , Procedimentos Ortopédicos/métodos , Período Pós-OperatórioRESUMO
Intravenous ketamine and lidocaine infusions may be useful adjuncts to inhalation anesthesia for sheep undergoing orthopedic surgery. In this study, 50 female sheep underwent experimental stifle surgery (29 received a meniscal implant and 21 received sham surgery). To induce anesthesia in the sheep, the authors intravenously injected ketamine and diazepam. They administered isoflurane in oxygen to maintain anesthesia and used mechanical ventilation to maintain normal arterial carbon dioxide pressure. Some sheep received intravenous infusions of ketamine and lidocaine during surgery, whereas others did not. Sheep that received a meniscal implant without ketamine-lidocaine required approximately 23% greater isoflurane concentrations than sheep that were given ketamine-lidocaine. These findings suggest that intravenous infusion of ketamine and lidocaine decreases the requirement for isoflurane during orthopedic surgery on anesthetized sheep.
