Standby Cannulated ECMO for High-Risk Percutaneous Coronary Intervention

Inclusion Criteria: 1. Clinicians decide to perform PCI during ECMO support. 2. Age of ≥18 3. Patient presents with a compromised ejection fraction of less than 35% or at risk of hemodynamic deterioration, or intervention on the last patent coronary conduit or an unprotected left main artery, or complex 3-vessel disease (SYNTAX score of ≥33) 4. Informed consent Exclusion Criteria: 1. Subject in cardiogenic shock(need inotrope, pressor or mechanical support to maintain SBP \>90mmHg) 2. Presence of moderate to severe aortic insufficiency 3. Severe peripheral vascular disease 4. creatinine≥4mg/dL 5. Liver dysfunction with elevation of liver enzymes and bilirubin levels to ≥ 3x ULN 6. History of recent (within 1 month) stroke or TIA 7. Abnormal coagulation(defined as platelet count ≤50000/mm3 or Fibrinogen ≤1.50g/L) 8. Allergy or intolerance to heparin, aspirin, ADP receptor inhibitors, or documented heparin induced thrombocytopenia.