Late potential abolition during ventricular tachycardia ablation strongly predicted VT-free survival in ARVC patients (HR 0.075; 95% CI 0.008-0.661; P=0.020).
Cohort (n=29)
Does VT ablation targeting late potential abolition prevent VT recurrence in ARVC patients with and without structural RV disease?
In patients with ARVC, VT ablation targeting late potential abolition is effective in preventing VT recurrence, regardless of the presence of structural RV disease.
Absolute Event Rate: 15% vs 40%
p-value: p=0.17
AIMS: Arrhythmogenic right ventricular (RV) cardiomyopathy (ARVC) is associated with ventricular arrhythmias, even without RV structural disease. We aimed to characterize the RV substrate using electroanatomical mapping and to define outcomes following ventricular tachycardia (VT) ablation in patients with and without RV structural abnormalities. METHODS AND RESULTS: Twenty-nine patients with definite or suspected ARVC undergoing VT ablation were classified as 'electrical' and 'structural' cardiomyopathy based on the absence or presence of major structural criteria. Right ventricular (RV) endocardial and epicardial mapping with assessment of bipolar and unipolar voltages, distribution of late potentials (LPs), and inducible VT morphologies were performed. The endpoints for VT ablation were VT non-inducibility and LP abolition. Fourteen patients were categorized as electrical RV cardiomyopathy and 15 were categorized as structural RV cardiomyopathy. In patients with electrical cardiomyopathy, scar was limited to the epicardial surface (epicardium 13 cm2vs. endocardium 1 cm2, P < 0.05), primarily in the outflow tract, whereas patients with structural disease had greater involvement of the endocardium. During a mean follow-up of 22 ± 11 months, the VT recurrence rate was 27%, with LP abolition being a predictor of VT-free survival (HR 0.075 (0.008-0.661), P = 0.020). There was a trend towards higher recurrence rates in structural RV cardiomyopathy (40%) compared with the electrical cardiomyopathy (15%, P = 0.17). CONCLUSION: The development of RV structural disease in patients with ARVC is associated with extensive epicardial and endocardial scar. Conversely those patients without RV structural disease have identifiable epicardial scar limited to the RV outflow tract. Ventricular tachycardia (VT) ablation in both groups targeting LP abolition is effective in preventing VT recurrence.
Kirubakaran et al. (Mon,) conducted a cohort in Arrhythmogenic right ventricular cardiomyopathy (n=29). Ventricular tachycardia ablation vs. Structural vs electrical RV cardiomyopathy was evaluated on Ventricular tachycardia recurrence (p=0.17). Late potential abolition during ventricular tachycardia ablation strongly predicted VT-free survival in ARVC patients (HR 0.075; 95% CI 0.008-0.661; P=0.020).