The carotid arteries (CA) passability and integral indices of cerebral hemodynamics were studied up in the CA high-degree stenosis, using ultrasound duplex scanning before and after its operative correction. In the clinic in 62 patients, suffering CA stenosis, in 2003-2011 yrs the carotid angioplasty and stenting were performed, and in some of them--simultaneously with the carotid endarterectomy. In a high-degree stenosis of CA there were established significant disorders of integral indices of cerebral blood flow: a significant reduction of the index of general blood flow cerebral volume (GBFCV) in account of its carotid component. While a high-degree stenosis of one of internal CA occurrence in conjunction with occlusion of contrlateral internal CA hemodynamic the indices were characterized by more significant disorder occurrence and more profound stress for the compensation mechanisms presence, demonstrated by trustworthy reduction of GBFCV on background of a trustworthy enhancement of its vertebral component. When occlusive affection of a contrlateral internal CA have had occurred after performance of a high-grade stenosis correction of internal CA a positive dynamics of the blood flow changes in carotid and vertebra-basilar basins was observed, witnessing a presence of the compensation-adaptive mechanisms of the brain blood flow autoregulation.