|Risk Model||Number of Variables Used to Calculate Score||Validated in PCI/CABG||Specific Evaluation in ULM Patients?|
|Mayo Clinic Risk Score (30–32)||17||0||+||+||–|
|AHA/ACC lesion classification (36–38,40)||0||11 (per lesion)||+||–||+|
|SYNTAX score (6,9,24,26,34,39–48)||0||11 (per lesion)||+||+||+|
|Society of Thoracic Surgery score (31,49–51)||40||2||–||+||–|
|Clinical SYNTAX score (52)||3||11 (per lesion)||+||–||–|
|Global Risk Classification (54)||17||11 (per lesion)||+||+||+|
AHA/ACC = American Heart Association/American College of Cardiology; ACEF = Age, Creatinine, Ejection Fraction; CABG = coronary artery bypass grafting surgery; EuroSCORE = European System for Cardiac Operative Risk Evaluation; PCI = percutaneous coronary intervention; SYNTAX = Synergy between Percutaneous Coronary Intervention with Taxus and Cardiac Surgery; ULM = unprotected left main stem.