Avaliação da anestesia dissociativa com xilazina-cetamina e midazolam-cetamina, associada à anestesia epidural com lidocaína, em gatas submetidas à ovariossalpingohisterectomia.

Abstract

Evaluation of dissociative anesthesia with xylazine-ketamine and midazolam-ketamine, associated with epidural anesthesia with lidocaine, in cats submitted to ovariosalpingohysterectomy. The objective of this research was to compare the effects caused by two anesthetic protocols in cats undergoing ovariohysterectomy, having the pre-medication acepromazine, along with associations ketamine-midazolam and ketamine-xylazine, comparing the effects on physiological variables, duration and quality of anesthesia. We used 10 mongrel cats, healthy, 6 months to 2 years of age and weighing 2.9 ± 0.2 kg were assigned into two groups. In ketamine-midazolam group (GCM), the animals were sedated with acepromazine, 0,5 mg / kg, intramuscular (IM), and fifteen minutes after anesthetized with ketamine at a dose of 7,5 mg / kg, IM and midazolam 0,5 mg / kg, IM, and after five minutes, took place lumbosacral epidural anesthesia with lidocaine at a dose of 0,22 mL / kg. In group ketamine-xylazine (GCX) the procedure was the same as described for the GCM, substituting midazolam by xylazine at a dose 1 mg / kg, IM. We evaluated the heart rate, electrocardiogram (P-wave duration and QRS complex and PR and QT intervals), respiratory rate and body temperature. We analyzed the average dose of ketamine dose readministration, the time elapsed between the administration of ketamine and the beginning of surgery, duration of surgery, degree of ataxia, attempts to raise and times to sternal recumbency and standing position. There were no significant changes in heart rate, the durations of the P wave and QRS complex and PR interval. Significant increase in the QT interval in the GCM, from T10. Respiratory rate decreased in the GCM from T0. Body temperature rediuziu in both groups from T10. We conclude that both associations can be recommended for the surgery of ovariohysterectomy did not change significantly the physiological parameters of the animals, highlighting the need for preventive measures to minimize the effect of lowering the temperature during surgery.