Scoring system | Specific features |
J-CTO score | First and widely used Applicable both for antegrade and retrograde approach Operator bias excluded |
CT RECTOR score | Non-invasive Operator bias excluded Severe calcification used as predictor Multiple occlusions were best seen by coronary CTA |
CL score | Both clinical and angiographic parameters Only the first attempt included Applicable mostly for antegrade approach |
PROGRESS CTO score | Not include prior CTO PCI failure Applicable for hybrid approach Final angiographic success as primary endpoint Circumflex CTO as an independent predictor |
ORA score | Simple and easy to remember Only 3 variables Applicable both for antegrade and retrograde approach Included clinical and angiographic parameters |
Ellis score | Improved model with powerful predictors Applicable for hybrid approach Complex definition for interventional collateral vessels Operator G as an independent predictor |