Influência da lidocaína ou da dextrocetamina pela via intratesticular na anestesia com sevoflurano em cães submetidos à orquiectomia eletiva / Influence of intratesticular administration of lidocaine or dextroketamine in dogs undergoing elective orchiectomy anesthetized with sevoflurane

ABSTRACT

Background: Elective orchiectomy is one of the most performed surgeries in the veterinary practice and is considered a moderately painful procedure; thus, the use of balanced anesthesia is a good choice. Local anesthetics have shown to be effective for intratesticular and spermatic cord blocks in several species; however, there have been no reports of the use of dextroketamine with this purpose. The objective of this study was to evaluate cardiovascular and respiratory variables, and analgesia produced by intratesticular block using dextroketamine or lidocaine, as well as to assess post-anesthesia recovery and discharge in dogs subjected to elective orchiectomy under inhalation anesthesia with sevoflurane.Materials, Methods & Results: Sixteen dogs which underwent elective orchiectomy were included in this study. All animals were healthy based on clinical and hematological examinations. The animals were randomly distributed into two groups, in which 2% lidocaine at 1 mg/kg (LG) or 5% dextroketamine at 2.5 mg/kg (KG) were administered by the intratesticular route. In both groups, anesthesia was induced with propofol to effect, and maintained with 1.7 V% sevoflurane diluted in 100% oxygen, administered through a calibrated vaporizer and appropriate anesthetic system based on the animal’s weight, kept under spontaneous ventilation. After induction, 10 min were given for stabilization of exhaled anesthetic concentration before one of the treatments was administered intratesticularly. Five min after administration of the local block, the surgical procedure was performed, which lasted up to 15 min.[...]