[1]Department of Cardiology State Key Laboratory of Organ Failure Research Nanfang Hospital Southern Medical University Guangzhou 510515 Guangdong Province China;
[2]Department of Cardiology General Hospital of Northern Theater Command Shenyang 110000 Liaoning Province China;
Chronic total occlusion; Percutaneous coronary intervention; Anterograde wire escalation; Parallel wire technique; Fielder XT guidewire; Success rate;