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;