Arrhythmia substrates accessible from the aortic root and immediate sub-aortic areas: Mapping and ablation

Area of Science:

• Cardiovascular Anatomy
• Cardiac Electrophysiology
• Interventional Cardiology

Background:

• The aortic root, encompassing the left ventricular outflow tract and interatrial septum, contains critical anatomical structures.
• Muscle sleeves and extensions within the aortic sinuses of Valsalva are implicated as arrhythmogenic sources.
• These regions provide access to substrates for arrhythmias in both idiopathic and structural heart disease.

Purpose of the Study:

• To review the anatomical relationships of the aortic root to cardiac arrhythmogenic substrates.
• To discuss current and emerging ablation strategies targeting these substrates.

Main Methods:

• Comprehensive literature review of anatomical studies and electrophysiology investigations.
• Analysis of imaging modalities and electroanatomic mapping data.
• Synthesis of information on ablation techniques and outcomes.

Main Results:

• Detailed description of the aortic root's anatomical proximity to arrhythmogenic myocardial sleeves and the inter-leaflet triangle.
• Identification of the sinuses of Valsalva as key access points to arrhythmogenic substrates.
• Correlation of anatomical findings with clinical data on outflow tract arrhythmias.

Conclusions:

• Understanding the aortic root's complex anatomy is crucial for effective arrhythmia ablation.
• Targeting specific anatomical structures within the aortic root offers potential for improved therapeutic outcomes.
• Further research into the electrophysiological properties of the aortic root is warranted.