Tehran University of Medical Sciences Acta Medica Iranica 0044-6025 53 3 2015 03 15 173 176 EN Mohammadhasan Namazi Department of Cardiology, Cardiovascular Research Center, Shahid Beheshti Univercity of Medical Sciences, Tehran, Iran. Morteza Safi Department of Cardiology, Shahid Modarres Hospital, Tehran, Iran. Hosein Vakili Department of Cardiology, Shahid Modarres Hospital, Tehran, Iran. Habibollah Saadat Department of Cardiology, Cardiovascular Research Center, Shahid Beheshti Univercity of Medical Sciences, Tehran, Iran. Saeed Alipour Department of Cardiology, Shahid Modarres Hospital, Tehran, Iran. Parsa Mahjoob Department of Cardiology, Shahid Modarres Hospital, Tehran, Iran. Maryam Taherkhani Department of Cardiology, Cardiovascular Research Center, Shahid Beheshti Univercity of Medical Sciences, Tehran, Iran. AND Department of Cardiology, Shahid Modarres Hospital, Tehran, Iran. Shamseddin Pedari Department of Cardiology, Shahid Modarres Hospital, Tehran, Iran. Mehrdad Taherion Department of Cardiology, Shahid Modarres Hospital, Tehran, Iran. Hasan Rajabi Moghaddam Department of Cardiology, Kashan University of Medical Sciences, Kashan, Iran . Abdolkarim Alhazifi Department of Cardiology, Shahid Modarres Hospital, Tehran, Iran. Masoume Vatanparast Deratment of Nursing, Shahid Modarres Hospital, Tehran, Iran. Saeed Khaligh Deratment of Nursing, Shahid Modarres Hospital, Tehran, Iran. 2015 10 11 Chronic total occlusion (CTO) intervention is still a challenging problem. The aim of this study is to determine factors that affect PCI results.The study was conducted on 72 patients in two centers. CTO angioplasty was done by the antegrade approach from the femoral and/or radial approach. The role of age, gender, anatomical variations such as calcification, length of the lesion, proximal bending, retrograde filling and occluded coronary artery (LAD, CCK or RCA), and wires were assessed. The success rate was 79.6%, and presence of calcification was an important factor in CTO PCI. Operator's experience, use of appropriate equipment and calcification are important factors in predicting a successful PCI. https://acta.tums.ac.ir/index.php/acta/article/view/4914 https://acta.tums.ac.ir/index.php/acta/article/download/4914/4359