 Due to the hemodynamic feature in elderlies, we will use conventional measurements as EKG, arterial blood pressure and pulse oximeter. To measure the perfusion of the lower extremities, we use a relative new tool, the non-invasive transcutaneous near infrared spectroscopy NIRS.2,3 NIRS was used as the cerebral oximetry to measure the tissue perfusion of the cerebral cortex. It uses reflectance oximetry to measure the oxygen saturation of the tissue underneath the sensor.1 Recently, NIRS has been proved not only to continuously monitor tissue oxygenation saturation StO2 continuously, but also to predict the patients poor prognosis.3,4 To measure the cardiac output intra-operatively, we will use the non-invasive cardiac output monitor NICOM, Cheetah. Bioreactance technique allows the measurement of hemodynamic changes via four electrodes placed on the thorax. The electrical current crossing the thorax makes signal phase shift, which is related to changes in the volume of the thoracic aorta. Thus, the volume change in the thoracic aorta is able to estimate stroke volume.1,5 Postoperative prognosis is adjusted with the recovery of ambulation, the duration of ICU stay, the morbidity and mortality, and the questionnaire SF-36 about quality of life. 