Trigger elimination of polymorphic ventricular tachycardia and ventricular fibrillation by catheter ablation: trigger...

Area of Science:

• Cardiology
• Electrophysiology
• Cardiac Arrhythmias

Background:

• Ventricular fibrillation (VF) is a life-threatening arrhythmia often initiated by ventricular premature contractions (VPCs) during cardiac repolarization.
• Ablation therapy is an increasingly utilized treatment for VF, targeting its triggers and underlying mechanisms.

Purpose of the Study:

• To review and synthesize current knowledge on ablation strategies for ventricular fibrillation.
• To highlight key targets and methodologies for successful VF ablation, including trigger identification and substrate modification.

Main Methods:

• Focus on mapping earliest activation sites and identifying Purkinje potentials or specific ventricular regions (e.g., RVOT) as ablation targets.
• Utilizing 12-lead ECG recordings of triggering events for regional origin localization and pace mapping when spontaneous VPCs are absent.

Main Results:

• Successful VF ablation can be achieved by eliminating triggering VPCs originating from specific sites.
• Substrate modification targeting reentry circuits within the Purkinje network or other cardiac regions can also suppress VF.

Conclusions:

• Identifying the earliest activation and earliest potential is crucial for successful VF ablation.
• Ablation strategies for VF encompass both trigger elimination and substrate modification, with precise targeting guided by ECG and electrophysiological mapping.