Transmural conduction velosity index in healthy schoolchildren

Area of Science:

• Pediatric Cardiology
• Electrophysiology
• Medical Imaging

Background:

• Assessing cardiac conduction in children is crucial for understanding heart health.
• Non-invasive methods are needed to evaluate ventricular activation and myocardial thickness.
• The Transmural Conduction Velocity Index (TCVI) offers a novel approach.

Purpose of the Study:

• To determine the Transmural Conduction Velocity Index (TCVI) in a cohort of healthy children.
• To investigate the relationship between TCVI and echocardiographically measured interventricular septal thickness (IVST).
• To explore the influence of left ventricular hypertrophy on conduction velocity in pediatric subjects.

Main Methods:

• Echocardiography was used to measure interventricular septal thickness (IVST).
• Body surface potential mapping measured ventricular activation time (VAT).
• TCVI was calculated as the ratio of IVST to VAT in 174 healthy children.

Main Results:

• TCVI values ranged from 14 to 49 cm/sec.
• A strong positive correlation was observed between TCVI and IVST (r = 0.75).
• The derived formula was TCVI = 3.25 X IVST + 0.56.

Conclusions:

• Left ventricular hypertrophy, indicated by increased muscular thickness, is associated with greater conduction velocity in healthy children.
• TCVI serves as a valuable index for assessing cardiac electrophysiology in pediatric populations.
• Findings suggest a link between myocardial structure and electrical conduction speed in the pediatric heart.