An organized approach to the localization, mapping, and ablation of outflow tract ventricular arrhythmias

Area of Science:

• Cardiology
• Electrophysiology
• Cardiac Anatomy

Background:

• Idiopathic ventricular arrhythmias (VA) commonly originate in the right and left ventricular outflow tracts (OT).
• Complex 3D anatomy of the OT influences electrocardiographic interpretation and ablation strategies.
• Understanding in situ anatomical relationships is crucial for effective VA management.

Purpose of the Study:

• To present a simple, reliable strategy for catheter-based mapping and ablation of outflow tract VAs.
• To enhance understanding of VA origins within the complex OT anatomy.
• To address specific challenges in mapping posterior RVOT and LV summit VAs.

Main Methods:

• Utilizing patient-specific electrocardiogram (ECG) morphology changes to predict VA origin.
• Employing a combination of fluoroscopy, electroanatomical mapping, and intracardiac echocardiography.
• Integrating activation and pacemapping techniques for precise localization.

Main Results:

• A reliable strategy for predicting ECG changes between adjacent structures (e.g., RVOT, aortic root) was established.
• Successful mapping and ablation of OT VAs can be facilitated by understanding anatomical relationships.
• Specific methods for differentiating posterior RVOT from right coronary cusp origins and mapping LV summit VAs were discussed.

Conclusions:

• A straightforward and dependable strategy for mapping and ablating outflow tract VAs has been developed.
• Accurate interpretation of ECG morphology and detailed anatomical knowledge are key to successful outcomes.
• This approach aids in overcoming challenges associated with specific OT VA origins.