Intracardiac Electrogram Targets for Ventricular Tachycardia Ablation

Area of Science:

• Cardiology
• Electrophysiology
• Medical Devices

Background:

• Ventricular tachycardia (VT) often stems from reentry mechanisms in scarred myocardial tissue post-infarction.
• Identifying VT ablation targets during sinus rhythm presents a significant clinical challenge, especially when VT morphology is unknown.

Purpose of the Study:

• To discuss contemporary intracardiac electrogram targets for VT ablation.
• To explain the fundamental physiology behind these electrogram targets.

Main Methods:

• Utilizing high-density electrogram recordings for substrate evaluation.
• Assessing electrogram voltage and activation delay.
• Employing substrate perturbation techniques like alternate site pacing and extra-stimulus testing.

Main Results:

• High-density mapping provides essential data for identifying ablation targets in sinus rhythm.
• Specific electrogram characteristics correlate with arrhythmogenic substrate.
• Substrate perturbation aids in uncovering critical areas for ablation.

Conclusions:

• Intracardiac electrogram targets are vital for successful VT ablation in patients with myocardial scarring.
• Understanding the underlying physiology of these targets optimizes ablation strategies.
• Advanced mapping techniques are key to managing complex VT cases.