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Figure 2 Line validation (A) pulmonary artery (PA) projection of an activation map of the electroanatomic mapping system in the patient with a single persisting gap in the lateral aspect of the posterior line as depicted by the gradual change of colors at the site of the conduction gap. Complete lesions demonstrate double potential while constantly pacing from the coronary sinus (CS). (B) Comparison of the pre- and post-ablation activation map in a left anterior oblique projection for type B. The right-hand panel demonstrates the activation sequence along a multipolar catheter advanced in the distal CS while constantly pacing from the RA septal site. Please note the prolongation of the activation time after complete anterior line deployment in the distal CS electrodes. (C) Post-ablation activation map after pulmonary vein (PV) isolation during pacing from the CS catheter shown in a PA projection. Double potentials are marked with blue dots. (D) Comparison of voltage in the pre- and post-ablation maps in a posterior-anterior projection of the LA. The voltage is depicted according to the color spectrum shown in the right upper corner, ranging from low (<0.1 mV, red) to high-voltage (>1.5 mV, purple). (E) Left-hand panel depicts the multipolar catheter in the right upper PV (RUPV) during contrast injection through the second trans-septal sheath. The right panel demonstrates the loss of the PV spike potential (arrow) during radiofrequency current application. Surface lead II, as well as a bipolar electrogram from the 4-mm ablation catheter (Mp), four bipolar electrograms of the PV catheter (from distal to proximal), and from the proximal CS are shown. MA = mitral annulus.