45 patients aged 32-63 years operated on for dissecting aneurysm of the thoracoabdominal part of the aorta were divided into 2 groups. Group 1 patients (n = 36) were operated on with application of the bypass using centrifuge pump. Group 2 patients (n = 9) were operated on without the bypass. The results evidence that the employed anesthesia and infusion therapy in combination with the bypass maintained by the pump provide stable intraoperative hemodynamics and prevent renal failure. Usage of the bypass in combination with liquor drainage reliably protects spinal cord from ischemia, especially in patients with long-term aortic ligature.