[Blood catecholamine levels in rabbits with varying resistance of the cardiovascular system to emotional stress].

The content of catecholamines and some products of their metabolism in the blood of rabbits with different resistance of the cardiovascular system to acute emotional stress was determined by high performance liquid chromatography with electrochemical detection. It was shown that in rabbits with mild arterial pressure (AP) changes in noradrenaline (NA) concentration increased by 145% by the end of the 3rd hour of the experiment. In rabbits with progressively reducing AP the blood NA concentration increased (by 272%) 10 minutes after the beginning of stimulation of the ventromedial nuclei of the hypothalamus and remained increased (to 500%) to the end of the experiment. The concentration of adrenaline and 3-4 dioxyphenylacetic acid was also increased in these animals.