Cardiac conduction system: delineation of anatomic landmarks with multidetector CT

Area of Science:

• Cardiovascular Imaging
• Cardiac Electrophysiology
• Anatomy

Background:

• The cardiac conduction system, including the sinoatrial node (SAN) and atrioventricular node (AVN), is crucial for heart rhythm.
• Direct visualization of these small structures is limited by current multidetector CT (MDCT) spatial resolution.

Purpose of the Study:

• To review the capability of MDCT in outlining relevant anatomic landmarks of the cardiac conduction system.
• To assess the clinical utility of MDCT-derived information for electrophysiologists.

Main Methods:

• Review of existing literature and imaging studies utilizing MDCT.
• Focus on the demonstration of specific cardiac structures and landmarks by MDCT.

Main Results:

• MDCT reliably visualizes related anatomic landmarks such as the SAN artery, cavotricuspid isthmus, Koch triangle, and AVN artery.
• MDCT can identify interatrial muscle bundles and pulmonary veins, important for electrophysiologic procedures.
• MDCT plays a role in demarcating structures associated with arrhythmias.

Conclusions:

• While direct visualization of the cardiac conduction system is limited, MDCT effectively outlines critical anatomic landmarks.
• MDCT provides valuable information for electrophysiologists in clinical practice, aiding in the assessment of arrhythmogenic substrates.