Uso de Técnica Anestésica Intravenosa Total (TIVA) ou Anestesia Geral Inalatória para inseminação artificial por videolaparoscopia em ovinos

Abstract

The number of surgical interventions performed on the ovine species has been increasing, especially in animals of high zootechnical value. Taking into account also the increase in the pressure of the society for the non-use of dogs in experimental protocols, both in surgery and in anesthesia, that made the small ruminant experimental models more adopted for some types of surgeries, such as: thoracic, cardiac surgeries and orthopedic. The ovine species still has favorable characteristics, such as its adequate size, which facilitates handling when compared to canine and swine, are easy to obtain and have similar pharmacological hemodynamic responses to man, which make them ideal for use in experimental surgery. The aim of the present study was to compare total intravenous anesthesia (TIVA) with general inhalation anesthesia as the best technique to perform artificial insemination by videolaparoscopy, in order to evaluate the electrocardiographic changes, qualitative variables and plasma cortisol levels in 10 females Santa Inês sheep, previously submitted to water and solid fasting for 6 to 12 hours. Preanesthetic medication, xylazine (0.05 mg / kg) was administered via intramuscular injection, then induced with ketamine (2 mg / kg) and midazolam (0.2 mg / kg) in the same syringe by via venous. All animals submitted to the experiment did not present severe intercurrences. The animals of both groups did not present a painful response during the procedure and in the postoperative period, only some cases of regurgitation and respiratory depression. Ventricular atrial blocks of the 1st and 2nd degree caused by xylazine and more frequent in the TIVA group were observed. Thus, in the conditions of the present study, the results of the two groups evaluated demonstrate that both can promote adequate anesthetic quality for performing artificial insemination by videolaparoscopy.