Transient Low-Voltage Area Regression After Pulsed-Field Ablation Using a Lattice-tip Catheter

Figures

• 

  Figure 1. Serial voltage maps at baseline and after a single pulsed field ablation (PFA) application using a lattice-tip ablation catheter. Voltage maps were obtained before ablation and at 1, 3, 5, 10, 15, and 20 minutes after a single PFA to the posterior carina region of the left atrium. Maps are shown in a posteroanterior view with slight cranial angulation. The bipolar voltage threshold used to define the low-voltage area was <0.5 mV. The acute low-voltage area was largest at 1 minute and gradually regressed until 15 minutes, with no apparent further change between 15 and 20 minutes. LIPV = left inferior pulmonary vein; LSPV = left superior pulmonary vein; RIPV = right inferior pulmonary vein; RSPV = right superior pulmonary vein.

• 

  Figure 2. Time-dependent changes in the dimensions of the low-voltage area after a single PFA application. The maximum and minimum diameters of the low-voltage area were measured at each time point. Values represent the mean ± standard deviation of 5 repeated measurements by a second independent observer. The maximum diameter decreased from 24.1 ± 1.0 mm at 1 minute to 11.1 ± 0.3 mm at 15 minutes and remained stable at 20 minutes. No formal statistical comparison was performed because the measurements represented repeated assessments of a single lesion.