Koch's triangle in pediatric age: correlation with extra- and intracardiac parameters

Area of Science:

• Pediatric Cardiology
• Cardiac Electrophysiology
• Anatomy

Background:

• The atrioventricular node's location in Koch's triangle is vital for transcatheter ablation.
• Existing data on Koch's triangle dimensions are limited in pediatric populations.
• Understanding pediatric dimensions is critical for safe radiofrequency ablation procedures.

Purpose of the Study:

• To determine the dimensions of Koch's triangle in pediatric hearts.
• To establish morphometric relationships relevant to pediatric cardiac anatomy and growth.
• To identify a reliable method for guiding transcatheter ablation in children.

Main Methods:

• Analysis of 69 human pediatric hearts (age range: 1 day to 14 years).
• Measurement of Koch's triangle dimensions and tricuspid valve diameter.
• Correlation analysis between morphometric parameters and body weight.

Main Results:

• No significant correlation found between body weight and Koch's triangle dimensions.
• A highly significant correlation (r = 0.653, P < 0.001) was identified between tricuspid valve diameter and the adjacent Koch's triangle cathetus.
• A mean ratio of 0.45 +/- 0.16 was found between the Koch's triangle cathetus and tricuspid valve diameter.

Conclusions:

• The tricuspid valve diameter can be used to estimate Koch's triangle dimensions in pediatric patients.
• This relationship allows for calculation of the ablation target area along the tricuspid annulus.
• This method enhances the safety and accuracy of radiofrequency ablation for pediatric arrhythmias, reducing risks to the atrioventricular node.