Az inhalációs gázkeverék melegítésének hatása nyulak (Oryctolagus cuniculus) és tengerimalacok (Cavia porcellus)intraoperatív testhőmérsékletére

Abstract

SUMMARY Background: Anaesthetic risk is composed of factors that can (e.g. hypothermia) and cannot (e.g. old age) be influenced. The maximal heat loss from a patient occurs in the first stadium of anaesthesia and it is easier to prevent hypothermia than reheat an animal.Objectives: The aim of the authors was to test a fast and effective way to heat the anaesthetic mixture to help to reduce the heat loss from patients. The method needs to be easy, cheap and usable in everyday veterinary practise.Materials and Methods: 20 rabbits and 20 guinea pigs were examined during the study. Surgery was performed on all the animals and age, sex and weight were noted. All animals were anaesthetised using inhalational anaesthesia via a facemask. 10 animals from each group inhaled normal unheated anaesthetic mixture, while 10 animals inhaled heated anaesthetic mixture. To heat the gas, 80 cm of the inhalational breathing tube was immersed in a 40±1 °C heated water chamber. Rectal temperature was measured from each animal every 10 minutes. Results: The rectal temperature of the examined rabbits breathing heated anaesthetic mixture was an average of 1.01°C warmer than those rabbits breathingthe non-heated gas. In guinea pigs this average difference was 0.6 °C.Discussion: The study only examined the first 40 minutes of inhalational anaesthe-sia, since most surgeries are finished after 40 minutes. Due to facemasks being used in many practises, with the whole head of the animal being exposed to the cold anaesthetic mixture, that method of anaesthesia was tested. There are various heating and humidifying products on the market, but all are quite expensive. The technique used here is simple and cheap, and has proved to be an effective way to prevent hypothermia in rabbits and guinea pigs during anaesthesia.