engleski

Heart rate variability during ‘kitty magic’ anaesthesia

The heart rate variability (HRV) analysis is an important tool in cardiology. HRV shows the fluctuating time between normal sinus beats (RR intervals) and indicates modulation of the heart rate by the autonomic nervous system (ANS). The purpose of the study was to determine HRV in anesthetised cats subjected to elective castration. Therefore, the Poincaré plot analysis, a method to assess the dynamics of HRV, was performed. The research was performed on 80 domestic cats. For the ‘dexKB’ group (20 male and 20 female cats), combinations of the anaesthetics dexmedetomidine 40 μg/kg ketamine 5 mg/kg and butorphanol 0.4 mg/kg were administered. For the ‘domKB’ group (20 male and 20 female cats) an anaesthetic combination of medetomidine 80 μg/kg, ketamine 5 mg/kg and butorphanol 0.4 mg/ kg was administered. A quantitative analysis of HRV was displayed by the Poincaré plot by adjusting it to an ellipse. For the performance analysis, the SD1 (Standard Deviation 1), SD2 (Standard Deviation 2), Poincaré index (PI) and the area of the ellipse were used as evaluation parameters. The female cats had the highest PI 60 min after anaesthetics administration and two times larger area of the ellipse in ‘dexKB’. SD1 and SD2 increased linearly up to 60 minutes in the females. In the male ‘dexKB’ cats, the highest PI was recorded 120 min and in ‘domKB’ 30 min after the administration of anaesthetics. The area of ellipse differs in time and the highest area was in the male ‘dexKB’ cats 60 min after anaesthetics administration, while in ‘domKB’ the highest area was 120 min after the application of anaesthesia. SD1 and SD2 in the male ‘domKB’ cats increased during anaesthesia and in ‘dexKB’ they increased up to 30 min after the anaesthetic combination administration. The analysis provides a qualitatively and quantitatively visual measure of ANS activity, a decrease in sympathetic and increase in parasympathetic activity, and can be used for a better dynamic monitoring during the induction of anaesthesia in the ‘dexKB’ and ‘domKB’ cats.

heart rate ; "kitty magic" anesthesia

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