The purpose of this study is to evaluate the effect of pneumatic compression on post-induction hypotension in elderly patients undergoing robot assisted laparoscopic prostatectomy.

The purpose of this study is to evaluate the effect of pneumatic compression of lower leg, which is performed during 20 minutes after anesthesia induction period, on post-induction hypotension in elderly patients undergoing robot assisted laparoscopic prostatectomy.

Inclusion Criteria:

• Patients who are scheduled robot assisted laparoscopic prostatectomy under general anesthesia
• Elderly patients (between 65 and 79 years old)
• American Society of Anesthesiologists physical status ≤3
• Patients who are voluntarily agreed to this clinical study

Exclusion Criteria:

• Uncontrolled hypertension, heart failure (ejection fraction <40%), arrhythmia requiring treatment, unstable coronary artery disease
• Patient's denial