Infusão contínua de remifentanil em cadelas pré-medicadas com levomepromazina e anestesiadas com tiletamina-zolazepam

• Autor(a) principal: Pereira, Taciana
• Data de Publicação: 2008
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/4963
• topic: Remifentanil; Tiletamina-zolazepam; Cadelas; Remifentanil; Tiletamine-zolazepam; Female dogs; CNPQ::CIENCIAS AGRARIAS::MEDICINA VETERINARIA::CLINICA E CIRURGIA ANIMAL::ANESTESIOLOGIA ANIMAL

The association tiletamine-zolazepam (T-Z) belongs to a group of drugs that promote a dissociative anesthesia. Remifentanil is a μ-agonist opioid, with great analgesic power, ultra-short action and capacity of increase general anesthetics. The aim of this study was to see the effects of the continuous infusion of remifentanil in dissociative anesthesia by the association T-Z, in bitches under orchiectomy. There were used 20 bitches, randomly distributed in two groups of ten animals each. After 8- hour fast for water and 12-hour fast for food, all the animals received levomepromazina by intravenous route, 1,0mg/kg, as preanesthetic medication. After 15 minutes anesthesia was induced with the association T-Z, with a bolus of 3mg/kg. Group 1 received continuous infusion of saline solution during 45 minutes; Group 2 received continuous infusion of remifentanil, 0,3μg/kg/min, during 45 minutes. The following variables were evaluated: rectal temperature, heart frequency, systolic pressure, respiratory frequency, tidal volume, minute ventilation, oxyhemoglobin saturation, hemogasometric values of arterial blood, electrocardiogram, analgesia, muscle relaxation, eyelid, corneal, interdigital and laryngo- tracheal reflexes, amount of salivary secretion, duration of induction, surgical anesthesia, total dose and recovery time. The moments established for variable measurements were: Before before preanesthetic medication administration; M1 15 minutes after preanesthetic medication; M2 immediately after anesthetic induction and orotracheal intubation; M3 In the moment of the first ligature (approximately 15 minutes after the beginning of infusion); M4 In the moment of the second ligature (approximately 30 minutes after the beginning of infusion); M5 15 minutes after M4, when the surgery was completed. There was a significant decrease in the rectal temperature in both groups. A significant increase in the heart rate and the systolic pressure was also seen in both groups, but more intensive in G1. The respiratory rate was different in the groups. G1 had an increase and G2 maintained in physiological values. The minute volume had a significant decrease in both groups, but maintained in physiological values. There were no significant differences between the arterial pH in both groups. Initially was a decrease that maintained physiologically stable. No academy was observed in any group. The muscular tonus was considered less intense in G2. G1 showed a higher able time and a lower recovery time when compared to G2. The results allowed the following conclusions: the continuous infusion of remifentanil with the association T-Z was considered satisfactory and demonstrated greater advantages over the anesthesia were the association T-Z was used as a solo agent.