Cardiosurgery with artificial circulation (AC) is attended with activation of plasma cascade proteolytic systems, which leads to homeostatic disturbances and postoperative complications. AC with the use of specific proteinase plasma sorption in a column with sepharose-immobilized acid-base proteinase inhibitor from human urine prevents activation of proteinase in the plasma. Application of specific plasma sorption facilitates rapid restoration of the plasma protein concentration lowered during AC, improves the course of the postoperative period, and reduces the risk of pulmonary, cardiovascular, and nervous complications.