A Novel Clinical Scoring Model for Interventional Therapy in Chronic Total Occlusion of the Coronary Artery

Table 2

Operator-CTO score.

Clinical variable
Previous target vessel CABG history			1 ◻
Angiographic variables
Blunt occlusion			1 ◻
Calcification			1 ◻
Curvature			1 ◻
Occlusion length ≥20 mm			1 ◻
Distal occlusion			1 ◻
Collateral circulation Rentrop score＜2			1 ◻
In-stent occlusion			1 ◻
Initial occlusion			1 ◻
Operator variables
Annual CTO-PCI volume ≥60 cases			−1 ◻
CTO-PCI time ≥5 years			−1 ◻
The overall CTO-PCI success rate of the last year ≥90%			−2 ◻
Total			_________
◻simple(≤2)	◻ medium(3)	◻ difficult(4)	◻ extremely difficult(≥5)