Abstract
A 57-year-old man had been diagnosed with long-standing atrial fibrillation and dilated cardiomyopathy. We tried PV isolation to improve his LV function. Left PV consisted of a huge common trunk. After left PV isolation was completed, regular tachycardia appeared in the left PV common trunk. We performed 3D mapping. Regular PV tachycardia (PVT) was circling around the scar area in PV. PVT was proved to be macro-reentrant tachycardia by an entrainment study.