The purposes of this study are 1) to explore the variability of decisions between different heart teams in complex coronary artery disease; 2) to evaluate the reasons of the discrepancy in decision making.

Heart team has been recommended by guideline for optimizing the decision making for patients with complex coronary artery diseases (CAD). However, prior studies have demonstrated that heart team decision might have poor reproducibility, and the variability of heart team decision remains unknown.

Thus, the investigators designed a single-center, retrospective, cross-sectional study to explore the decision variability of heart team in CAD patients. The investigators will retrospectively recruit patients with angiographically confirmed 3-vessel or left main disease from a coronary angiography database at Fuwai hospital. Patients' baseline information will be collected. And different heart teams will be established and made decisions for the enrolled patients. First, the investigators will assess the decision variability between different heart teams. Secondary, the investigators will evaluate the reason of discrepancy by qualitative and quantitative analysis.

Inclusion Criteria:

• Patients with angiographically confirmed 3-vessel disease or left main disease

Exclusion Criteria:

• Prior percutaneous coronary intervention (PCI) or coronary artery bypass graft (CABG)
• Myocardial infarction with acute phase judged by Electrocardiograph or biomarkers
• Combined with severe valvular disease, great vessel disease or huge ventricular aneurysm which need surgery
• Combined with atrial fibrillation or severe arrhythmia

Eligible patients will be randomly selected and enrolled from a coronary angiography registry database at Fuwai hospital to make sure the representativity of enrolled patients.