Department of Cardiovascular Medicine;
Affiliated Nanhai Hospital;
Southern Medical University (People's Hospital of Nanhai District);
The Second School of Clinical Medicine;
Southern Medical University;
Guangdong Provincial People's Hospital;
Guangdong Academy of Medical Sciences;
Department of Cardiovascular Medicine;
The Second Affiliated Hospital of Guangzhou Medical University;
Department of Cardiology;
Guangdong Cardiovascular Institute;
Guangdong Provincial People ' s Hospital;
Guangdong Academy of Medical Sciences;
extension catheter; Guidezilla; chronic total occlusion; percutaneous coronary intervention; retrograde; major adverse cardiac events;