Fig 1.
This series of pictures show the electrophysiological characteristics in the RV epicardium of an ARVC patient.
(A) A concealed entrainment within the isthmus of the reentrant circuit. The post-pacing interval (PPI) was 320 ms, almost equal to the VT cycle length (326 ms). The interval between the stimulation signal to onset of QRS complex (S-QRS) was 108 ms (108/320 = 0.34), indicating that the location was within the center of the isthmus. (B) The sequential activation of fractionated potentials. (C) VT stopped during ablation. (D) The three-dimensional activation map (Ensite Navx Velocity) of this patient’s RV epicardium which shows a reentry in the RV free wall. (E) Fluorescence of the mapping catheters. DD: St Jude Medical DuoDeca catheter.
Fig 2.
The substrate maps of the RV endocardium and epicardium of an ARVC patient (CARTO3 system).
(A) The fractionated potentials are marked as blue dots within a low voltage zone and ablation energy was delivered within the low voltage zone with fractionated potentials in the RV endocardium. (B) This is the substrate map of the RV epicardium and ablation marks within the low voltage zone with fractionated potentials of the same patient.
Table 1.
General demographic data and clinical status.
Fig 3.
The overall cumulative VT-free survival curve of all 70 procedures.
Fig 4.
The cumulative VT-free survival curves of different RFCA approaches (the endocardial approach and the combined approach).
The latter achieved better results than the former (Log-rank p = 0.028).
Fig 5.
The cumulative VT-free survival of different acute results.
The procedures leading to acute procedural success achieved significantly better VT-free survival than those without acute procedural success (Log-rank p < 0.001).
Table 2.
Multivariate analysis of VT-free survival in all patients by COX regression analysis.
Table 3.
Multivariate analysis of VT-free survival in the endocardial approach group by COX regression analysis.