[Sympathetic efferent activity in various nerves and regional blood flow in controlled bradycardia].

The effect of prolonged controlled bradycardia on efferent sympathetic activity of cervical, splanchnic and femoral nerves and regional blood flow in carotid, splanchnic and femoral arteries were studied in anesthetized cats. Initial drop of blood flow followed its increase in carotid and femoral arteries. The activity considerably increased in corresponding nerves. Blood flow increased only by the end of the 1st hour of bradycardia in splanchnic artery. Inhibition of activity occurred in splanchnic nerve. Compensatory reactions of blood flow were absent in regional vessels against the background of the phentolamine alpha-adrenoreceptor blockade.