The mechanism of AF ablation-related atrial tachycardias(ATs)is macro-reentry, and these ATs frequently rotate around anatomical obstacles such as pulmonary veins, tricuspid valve, and mitral valve. A linear ablation between these anatomical obstacles is therefore an important strategy to treat them. Differential pacing is normally used to confirm the achievement of linear lesion at the cavo-tricuspid isthmus, but this concept has also been applied to assess the achievement of the other linear lesions. However, high-resolution mapping demonstrates that pseudo-block is observed in 20-30% of cases. Novel omnipolar technology selects an optimal local EGM from omnipolar EGMs in 360 degrees calculated from cliques, composed of 3 unipoles and 2 orthogonal bipoles, displaying them as Activation Vectors. We demonstrate a case in which the achievement of linear lesions was successfully diagnosed in real time by this function.