Table 1 Comparison of diffrent variables of CTO scoring systems used in this study [15]
Criteria of Scores | J-CTO (0–5) | Progress-CTO (0–4) | Euro (CASTLE-CTO) (0–6) | CL-CTO (0–8 by 0.5) | ORA-CTO (0–4) |
|---|---|---|---|---|---|
Calcification | Calcification Existence | Calcification Existence | Calcification Existence** | ||
Tortuosity | Bending > 45 | Presence of Two bends > 70 degrees or 1 bend > 90 degree | Presence of two bends > 90 or 1 bend > 120 | ||
Age | Age > 70 | Age > 75 | |||
Stump | Blunt Proximal Cap | Proximal Cap Ambiguity | Blunt | Blunt | |
Length | Occluded segment > 20 mm | Occluded segment > 20 mm | Occluded segment > 20 mm* | ||
Redo (Previous Failed Attempt) | Yes | ||||
CABG (History) | Yes | Yes* | |||
MI (History) | Yes | ||||
Location of CTO | LCX | Non-LAD | |||
Interventional Collaterals | Absence | Collateral Filling** | |||
Ostial CTO | Yes |