NCT06816368

Combined Pulsed Field and Radiofrequency Energy for Ablation of Ventricular Tachycardia

The Thermocool SmartTouch SF Catheter With the Trupulse™ Generator for Endocardial Ablation in Patients With Ventricular Tachycardia

• Status: Recruiting
• Phase: N/A
• Study type: Interventional
• Enrollment: 30 (estimated)
• Sponsor: McGill University Health Centre/Research Institute of the McGill University Health Centre · Academic / Other
• Sex: All
• Age: 18 Years
• Healthy volunteers: Not accepted

Summary

This will be a single arm study evaluating a new ablation technology for performing catheter ablation of ventricular tachycardia. The technology combines novel pulsed field ablation with radiofrequency ablation.

Detailed description

One of the limitations of conventional ventricular tachycardia (VT) ablation using radiofrequency (RF) energy is the inability to reach arrhythmogenic tissue deep in the myocardium. Pulsed field (PF) energy, which causes cell death via irreversible electroporation and is non-thermal, may improve outcomes in patients with VT since it has been shown to have better depth penetration in previously scarred tissue. Furthermore, the combination of RF and PF treatment in the same location can increase tissue lesion depth more than either energy alone. This can potentially minimize the need for epicardial ablations, or complex bipolar ablation strategies as well as associated procedural complications. RF and PF have been used extensively for atrial ablation. RF has been the mainstay for all VT ablation but PF use for VT is relatively new. Pre-clinical work of ventricular ablation procedures in a swine model evaluated the effects of combined and co-localized PF and RF application on cardiac lesion size and their corresponding histological changes. Compared to PF alone ablation, lesion depths and widths were significantly greater in both RF-PF and PF-RF applications. Histology for both combined lesions showed central thermal necrosis surrounded by a hemorrhagic and transitional PF zone. The findings provided evidence for appropriate use of combination therapy in clinical settings. The design of the study will be carried out as an interventional, prospective, multicenter, single-arm safety and effectiveness evaluation using the Biosense Webster PF/RF Ablation System. The study will enroll subjects with sustained symptomatic VT who are candidates for catheter ablation. Eligible subjects who sign the Informed Consent Form (ICF) and who meet all eligibility criteria will be enrolled and treated with the STSF Catheter in conjunction with the TRUPULSE™ Generator. A maximum sample size of 30 subjects is planned in the study. All study subjects will be followed-up for 6 months after the study procedure.

Conditions

• Ventricular Tachycardia (V-Tach)

Interventions

Type	Name	Description
DEVICE	Catheter ablation using sequential radiofrequency and pulsed field ablation	We are using sequential application of radiofrequency and pulsed field ablation to increase lesion depth and better treat ventricular arrhythmias.

Timeline

• Start date: 2025-07-28
• Primary completion: 2026-07-01
• Completion: 2026-08-01
• First posted: 2025-02-10
• Last updated: 2026-02-19

Locations

3 sites across 1 country: Canada