OA Intervention

All consecutive patients with moderate/ severely calcified coronary lesions who underwent PCI facilitated by the Orbital Atherectomy The decision to perform orbital atherectomy was left to the operator's dissertation after the detection of a moderate/severely calcified lesion. Angiographic calcification was classified as moderate when it involved between 30% and 50% of the reference lesion diameter, and severe when it occupied over 50% of the reference diameter. When the initial assessment was based on IVUS finding lesion had to reach at least 2 points in the IVUS calcium score. There were no angiographic exclusion criteria regarding lesion anatomy such as the length, tortuosity, severity, or location. All procedural features(use additional lesion preparation technique; stent implantation parameters, periprocedural pharmacological therapy, use of intravascular imaging along with the left ventricular support device) were left to the discretion of the operator.