Catheter Ablation of Long-Lasting Accelerated Idioventricular Rhythm in a Patient with Mild Left Ventricular Dysfunction
(a) The local contact bipolar and unipolar electrograms at the ablation site during AIVR. In the bipolar recording, the potential preceded the surface QRS wave by 18 ms. The unipolar recording exhibited a QS pattern. (b) The intracardiac electrogram during the RF delivery. The RF current interrupted the AIVR.