It was studied renal function in patients with ischemic heart disease and carotid arteries lesions after open heart operation and stenting of carotid arteries. It was shown that risk of renal dysfunction in postoperative period in patients' group with cardiopulmonary bypass was higher than in patients after minimally invasive myocardial revascularization. Surgeries on a beating heart are accompanied by a smaller decreasing of glomerular filtration rate. Also it permits lower glomerular microalbuminuria and lower fractional excretion of urea in comparison with patients who were operated by using of cardiopulmonary bypass.