Anestesia de tumescência na mastectomia de um felino: relato de caso

Abstract

The mammary gland tumors in felines and canines are queit fascinating to oncologists becauseits similarities with the human breast cancer. As the third most common cancer in cats, mammary tumor has as treatment most often surgically. Balanced anesthesia associated with local anesthetic to general anesthesia and volatile anesthetics provide the maintenance of superficial anesthesia, thus resulting in lower cardiovascular and respiratory depression, consequently, a stable anesthesia with better and fastter recovery. The anestesia by tumescent technique consists in an infiltrated anesthesia of large areas by a significant volume of a diluted local anesthetic, usually with vasoconstrictor substance, PH controlling solution and a sterile intravenous solution infiltrated directly under the incisional area. Among the advantages of tumescent anesthesia may be cited the simplicity of the execution, reduced bleeding incidence, anesthesia of a large area of the body, trans operative analgesia and postoperative analgesia increased, reaching more than 18 hours effect. This current report refers to a cat, of Siamese breed, seen by the Veterinary Hospital of the Universidade Federal do Recôncavo da Bahia, where the clinical care observed mammary lump, and indicated the radical unilateral mastectomy surgery, because of the ulceration process on it. In the surgery center, the induction was made with propofol, followed by inhalational anestesia maintenance with isoflurane in calibrated vaporizer in MAC enough to keep the animal in superficial anesthesia. It was made the Infusion of 40 ml of tumescent solution at a concentration of 0.125%, with the aid of a 20 ml syringe and a 40x8 needle, along both sides of all mammary chain to be removed. Heart rate and respiratory rate were observed, which remained constant and below 20% of baseline parameters showing that the tumescent technique was effective controlling the trans-operative pain.