A total of 115 children aged 13-17 years (mean age 15.77 +/- 1.89 years, 98 boys and 17 girls) with essential arterial hypertension (EAH) were examined. Of them, 70 children had stable arterial hypertension (SAH), 45 children - labile arterial hypertension (LAH). 24-h monitoring of blood pressure, triplex ultrasound study of the renal vessels were performed in all the patients. The assessment of renal hemodynamics showed that blood flow was more active in SAH patients. The clinostatic test revealed inhibition of circulation at the level of the basic trunk (by 26% in SAH and by 22% in LAH) and segmentary renal arteries (by 28% in SAG), IR ( < 0.52). The above findings confirm the action of arterioveinous bypass blood flow mechanism and provide diagnosis of nephroangiopathy at early stages of EAH.