Anatomy of the cardiac conduction system

Area of Science:

• Cardiology
• Cardiac Electrophysiology
• Cardiac Anatomy

Background:

• The human heart's conduction system coordinates rhythmic contractions.
• The precise pathway of the atrioventricular (AV) conduction axis has been debated for over a century.

Purpose of the Study:

• To review the anatomy of the cardiac conduction system.
• To highlight recent findings aiding understanding of the AV conduction axis and its variations for conduction system pacing (CSP).
• To discuss anatomical differences between His bundle pacing and left bundle branch area pacing.

Main Methods:

• Review of recently published articles on cardiac conduction system anatomy and physiology.
• Discussion of anatomical perspectives on His bundle pacing versus left bundle branch area pacing.
• Mention of advanced imaging techniques like high-resolution contrast-enhanced micro-computed tomography.

Main Results:

• Clinical experience with CSP has improved understanding of cardiac conduction system anatomy and physiology.
• Knowledge of AV conduction axis variations is critical for successful CSP.
• Left bundle branch area pacing has emerged as an alternative CSP strategy.

Conclusions:

• A deeper understanding of cardiac conduction system anatomy is crucial for advancing CSP techniques.
• New imaging technologies may aid future CSP procedures.
• Anatomical insights are key to differentiating clinical outcomes of His bundle pacing and left bundle branch area pacing.