Prognostic Accuracy of Coronary CT and Dobutamine Stress Echocardiography in Patient Undergoing Non-cardiac Surgery

Inclusion Criteria: 1. Elective surgery 2. Intermediate or high-risk noncardiac surgeries 1) intermediate risk surgery: intrathoracic, intraperitoneal, orthopedic,head and neck, and prostate 2) high risk surgery: vascular 3. Revised cardiac risk index score ≥1 (more than one of the following criteria) 1) vascular surgery, intraperitoneal, intrathoracic surgery 2) history of ischemic heart disease 3) history of heart failure 4) history of cerebrovascular disease 5) diabetes with insulin treatment 6) chronic kidney disease (serum creatinine \> 2.0 mg/dL) Exclusion Criteria: 1. Need for emergency surgery 2. Active cardiac conditions 1) recent (within 1 month) myocardial infarction 2) acute decompensated heart failure 3) severe valvular disease 4) fatal cardiac arrhythmia 5) acute pulmonary embolism 6) acute myocarditis 3. Relative contraindications or immeasurable coronary stenosis of the CTCA