JACC. Clinical electrophysiology最新文献

Background: Idiopathic ventricular arrhythmias (VAs) originating from the left ventricular summit (LVS) can be ablated from some endocardial sites across the left ventricular myocardium where ventricular activation is later than in the great cardiac vein (anatomical approach). Failure of ablation at the initial target site was common, however, approaches have evolved to improve the outcomes.

Objectives: The goal of this study was to explore predictors of successful anatomical ablation of LVS VAs to elucidate the ablation site selection strategy.

Methods: Forty consecutive patients who underwent successful anatomical ablation of idiopathic LVS VAs with completed endocardial mapping were studied.

Results: The earliest ventricular activation relative to the QRS onset in the endocardium and great cardiac vein was -1 millisecond (-5 to 0 milliseconds) and -24 milliseconds (-29 to -18.25 milliseconds), respectively. Endocardial radiofrequency catheter ablation (E-RFCA) was performed at the shortest distance from the epicardial earliest activation site (EAS) in 36 patients; it was successful in 20 in whom the endocardial earliest ventricular activation was also recorded at the ablation site. That approach failed in 16 patients, and E-RFCA was successful at the junction between the left and right coronary cusps in 3. In 13 of 16 patients with a failed ablation and the remaining 4 patients, E-RFCA was successful at or near the endocardial EAS. Overall, E-RFCA was successful at the endocardial EAS in 37 (93%) of 40 patients.

Conclusions: This study suggests that E-RFCA of LVS VAs through an anatomical approach should first target the endocardial EAS rather than sites anatomically closest to the epicardial EAS.

Background: Pulsed field ablation (PFA) for atrial fibrillation ablation provides a unique challenge for acute lesion evaluation due to reversible myocardial injury. Real-time guidance during ablation would provide reference for lesion location and extent. The second-generation pentaspline PFA catheter improves mapping integration with real-time visualization of catheter shape and previews the estimated ablative electric field.

Objectives: This study sought to evaluate the estimated shape and position of the acute tags relative to low-voltage borders from high-density, postablation maps.

Methods: A multicenter, first-in-human study, NAVIGATE-PF (Feasibility Study on the FARAVIEW Technology), was conducted in 30 atrial fibrillation patients. Tags were placed following each application based on the shape of the estimated electric field. Post ablation, a high-quality, high-density voltage map was created with a high-density mapping catheter. Tags were overlaid on the high-density map and contours were drawn at the border of low voltage (≤0.5mV) and the outer border where at least 2 overlapping tags were placed.

Results: All 30 patients were successfully treated with the second-generation PFA catheter. For the 15 patients included in the acute tags analysis, the region of acute electrical isolation correlated with the estimated ablative electric field. Post-procedural processing of the distance between the tag and low-voltage border was -0.58 mm (Q1-Q3: -2.9 to 2.17 mm) where a negative number indicates the tag is smaller than the low-voltage border.

Conclusions: The second-generation pentaspline PFA catheter, with dynamic shape visualization and preview of anticipated electric field, resulted in alignment with postablation voltage mapping. (Feasibility Study on the FARAVIEW Technology [NAVIGATE-PF]; NCT06175234).