Patient 4. Intracardiac electrograms demonstrating that the LVP potential is a local potential recorded in electrograms close to the ectopic focus only. Recordings are the same as in previous figures. In addition, a His bundle electrogram is recorded 2–3 cm away from the ablation catheter located at the site of origin of the ventricular premature beats, together with a right ventricular electrogram recorded at the right ventricular apex (RVA), 5–6 cm away from ABL uni and ABL d. No LVP and LVP _VPB potentials are seen in His bundle electrogram, and the amplitude of the LVP _vpb is 0.75 mV compared with 2.18 mV of the V potential in the His bundle electrogram. A is atrial electrogram in the His bundle electrogram, and H is the His bundle potential.