INFLUENCE OF ANESTHESIA TYPE ON THE BLOOD CIRCULATION IN RATS

The study aims to detect the effects of non-inhaled anesthetics of two different types on the parameters of the central hemodynamics and microcirculation in an occlusive reactive hyperemia test in two groups of male Wistar rats weighting 400–500 g. The “ChH” group received 6 % chloral hydrate solution at a dose of 300 mg/kg intraperitoneally, while the “zol + xyl” group received 20 mg/kg of tiletamine/zolazepam (Zoletil 100, France) mixed with 5 mg/kg of xylazine (Xylanit, Russia) intraperitoneally. The following parameters were measured: blood pressure, average heart rate, duration of PQ, QRS, and QTc intervals according to the electrocardiography, cutaneous blood flow with laser Doppler flowmetry, arterial blood gas composition and acid-base state. The mean value of perfusion was recorded simultaneously with electrocardiography and blood pressure. The parameters of a
post-occlusive reactive hyperemia were analyzed to conduct an occlusive reactive hyperemia test. Blood pressure was statistically significantly lower in “ChH” group than in “zol + xyl” group when analyzing the central hemodynamics parameters. The “ChH” group demonstrated higher maximum vasodilation in reactive hyperemia (CVCmax) and time of its achievement (Tmax). Both types of anesthesia demonstrated compensated and subcompensated mixed acidosis and moderate arterial hypoxemia when comparing parameters of arterial blood gas composition and acid-base state in rats.

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