Revascularization of chronic total occlusion under the guidance of mobile CT workstation

INTERVENTION: Design: The patients with CTO by computed tomography angiography (CCTA ) are randomly divided into 2 groups. The group 1 consists of patients who are examined by CCTA and our dedicated mobile work station. The station has the capability of reconstruction of acquired CT image and manipulate the images so as to allow the interventional cardiologist better interpret findings. The following indices are calculated: the length of the occlusion, the degree of the calcification and the characteristics of the occlusion. The most important step is to puncture the occluded artery with various guide wire. Always keep the wire at the center of the occlude artery. The procedure usually takes 2 hours. The patients can be discharged within 7 days. The follow‐up is routine but not mandatory. CONDITION: Computed tomography angiography chronic total occlusion (CTO) PRIMARY OUTCOME: Any adverse events during the hospital stay, including AMI, death, cardiac tamponade and pulmonary edema. Recannalization of CTO is documented by CAG SECONDARY OUTCOME: contras (ml) fluoroscopy time (minutes) number of balloons number of guidewire procedure time (minutes) INCLUSION CRITERIA: 1. CTO is arbitrarily defined as a > 3 month old, total obstruction of a coronary artery. 2. The patients have undergone both CAG and CCTA.