Spatial relationship between the pulmonary trunk and the left coronaries: Systematic risk assessment based on...

Area of Science:

• Cardiovascular Imaging and Intervention
• Cardiac Electrophysiology
• Anatomical Studies

Background:

• Catheter ablation for right ventricular outflow tract ventricular arrhythmias above the pulmonary valve is a growing interventional cardiology technique.
• Understanding the anatomical relationship between the pulmonary trunk and coronary arteries is crucial for procedural safety.

Purpose of the Study:

• To systematically analyze the spatial relationship between the pulmonary trunk and the left coronary arteries.
• To identify critical anatomical regions posing a risk during catheter ablation procedures.
• To provide data for enhancing the safety of transvalvular ablation techniques.

Main Methods:

• Analysis of contrast-enhanced computed tomographic scans from 58 patients.
• 3-dimensional reconstruction of the pulmonary trunk and proximal left coronary arteries.
• Automated determination of minimal distances using a novel mathematical algorithm.

Main Results:

• A minimal distance of 1.4 ± 0.11 mm was observed between the pulmonary trunk and coronary arteries.
• The closest proximity was 13.8 ± 0.87 mm above the pulmonary valve annulus, specifically near the anterior aspect of the left sinus cusp.
• 84% of patients were at potential risk within 10 mm of the left sinus cusp, with 97% risk in the 10-20 mm region above it.
• No significant correlation was found between clinical parameters (age, gender, BMI) and spatial proximity.

Conclusions:

• A significant and close spatial relationship exists between the pulmonary trunk and coronary arteries.
• The anterior left sinus cusp region presents the highest risk for coronary proximity during procedures.
• These anatomical findings are critical for guiding catheter ablation strategies performed above the pulmonary valve to minimize coronary damage.