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portuguesO aumento crescente da expectativa de vida dos caes, faz com que muitos animais cardiopatas necessitem de um procedimento anestesico-cirurgico. Os objetivos do estudo foram investigar as alteracoes ecocardiograficas de protocolos de inducao anestesica, em caes sedados com acepromazina (0,05mg/kg) e butorfanol (0,3mg/kg) (AB). Foram utilizados 24 caes, machos, SRD, com peso medio de 12,40±3,1kg, os quais foram alocados aleatoriamente em quatro grupos (n=6). Apos 15 minutos da medicacao pre-anestesica, foi realizada inducao anestesica com diazepam (0,5mg/kg)/etomidato (1mg/kg) (DE), ou diazepam (0,5mg/kg)/cetamina (3mg/kg) (CD), oupropofol (4mg/kg) (P) ou cetamina (1mg/kg)/propofol (3mg/kg) (CP). Aferiu-se a PAS e ecocardiografia imediatamente antes da aplicacao do protocolo de sedacao (basal), 15 minutos apos a sedacao (M1) e imediatamente apos a inducao anestesica (M2). Nao foram observadas diferencas significativas na PAS e nas variaveis hemodinâmicas como indice cardiaco, fracao de encurtamento, fracao de ejecao, entre os grupos, em todos os momentos avaliados. A PAS reduziu significativamente, apos inducao anestesica, nos caes do grupo DE e CP. A FC reduziu, apos inducao, em relacao aos valores pos sedacao, somente no grupo CD, mantendo-se estavel nos demais grupos estudados. Conclui-se que os protocolos DE e CP reduzem de maneira semelhante a PAS, nos caes medicados com CD e P a PAS mantem-se estavel, apos inducao anestesica. Todos os protocolos de inducao anestesica mantem estaveis o IC em caes pre-medicados. Nenhum dos protocolos avaliados promove alteracoes ecocardiograficas significativas. Aassociacao cetamina/diazepam tem um impacto negativo no relaxamento miocardico. Palavras-chave: ecocardiografia; caes; sedacao; inducao. EnglishThe objective of this study was to investigate the echocardiographic changes during anesthesia induction in dogs sedated with acepromazine (0.05mg/kg) and butorphanol (0.3mg/kg) (AB). Twenty-four male dogs, with a mean weight of 12.40kg±3.1kg, were randomly assigned to 4 groups (n=6). Fifteen minutes after administering pre-anesthetic medication, anesthesia with diazepam (0.5mg/kg) and etomidate (1mg/kg) (group DE); diazepam (0.5mg/kg) and ketamine (3mg/kg) (group CD); propofol (4mg/kg) (group P); or ketamine (1mg/kg) and propofol (3mg/kg) (group CP) was administered to the 6 dogs in each group. Systolic blood pressure (SBP) was measured and echocardiography was performed immediately prior to the application of the sedation protocol (baseline), 15 minutes after sedation (M1), and immediately after anesthesia induction (M2). No significant differences were observed in SBP and in hemodynamic variables such as cardiac index, shortening fraction, and ejection fraction, between groups at all time points (M0, M1, and M2) evaluated. The SBP was significantly reduced after anesthetic induction in the dogs of the DE and CP groups. It can be concluded that the protocols DE and CP reduce similarly to SPB in dogs medicated with CD and P to SBP remain stable after anesthetic induction. All anesthetic induction protocols maintained a stable IC in premedicated dogs. None of the protocols evaluated promoted significant echocardiographic changes. Furthermore, the ketamine and diazepam combination had a negative impact on myocardial relaxation. Key words: echocardiography; dogs; sedation; induction

Echocardiographic evaluation of dogs subjected to different protocols of anesthetic induction