Scoring system

Published year

No. of CTO patients

Primary endpoint

Predictors

Predictability

J-CTO

2011

465

Guidewire crossing within 30 minutes

1) Entry shape (1)

2) Calcification (1)

3) Bending > 45˚ (1)

4) Occlusion length (1)

5) Re-entry lesion (1)

1) Easy: Score 0

2) Intermediate: Score 1

3) Difficult: Score 2

4) Very difficult: Score ≥ 3

CT

RECTOR

2015

240

Guidewire crossing within 30 minutes

1) Multiple occlusions (1)

2) Blunt stump (1)

3) Severe calcification (1)

4) Bending > 45˚ (1)

5) Second attempt (1)

6) Duration of CTO (1)

1) Easy: Score 0

2) Intermediate: Score 1

3) Difficult: Score 2

4) Very difficult: Score ≥ 3

CL

2015

1657

Procedural success defined by < 30% residual diameter stenosis with TIMI grade 3

1) Severe calcified lesion (2)

2) Previous CABG (1.5)

3) Lesion length ≥ 20 mm (1.5)

4) Previous MI (1)

5) Blunt stump (1)

6) Non-LAD CTO location (1)

1) High: ≤ 1

2) Intermediate: < 3

3) Low: < 5

4) Very low: ≥ 5

PROGRESS CTO

2016

781

Technical success defined by < 30% residual diameter stenosis with TIMI grade 3

1) Proximal cap ambiguity (1)

2) Absence of interventional collaterals (1)

3) Moderate/severe tortuosity (1)

4) Circumflex CTO (1)

The higher score, the lower technical success

ORA

2016

1073

Technical success defined by final residual stenosis < 20% and TIMI grade 3

1) Ostial location

2) Rentrop collateral filling

3) Age

1) Easy: Score 0

2) Intermediate: Score 1

3) Difficult: Score 2

4) Very difficult: Score ≥ 3

Ellis score

2017

436

Technical success defined by restoration of TIMI flow grade 3 and no stenosis > 50%

1) Ambiguous cap proximal cap

2) Collateral score

3) Tortuosity

4) Calcification

5) Poor distal target

6) Length > 10 mm

7) Ostial location

8) Operator G

The higher score, the lower technical success