Quantification of the normal Frank and McFee-Parungao orthogonal electrocardiogram at ages two to ten years

Area of Science:

• Pediatric Cardiology
• Biomedical Engineering
• Electrocardiography

Background:

• Orthogonal electrocardiogram (ECG) systems are crucial for accurate cardiac electrical activity assessment.
• Understanding age-related variations in pediatric ECG parameters is essential for diagnosing cardiac conditions.
• The Frank and McFee-Parungao lead systems offer different spatial representations of the ECG.

Purpose of the Study:

• To quantify and compare the Frank and McFee-Parungao orthogonal electrocardiogram in normal children aged 2-10 years.
• To identify age-related differences in QRS voltages and T vector orientation.
• To analyze significant differences between the Frank and McFee-Parungao lead systems.

Main Methods:

• A cohort of 175 normal children aged 2-10 years underwent orthogonal electrocardiogram recordings.
• Data were analyzed to compare age groups (2-5 years vs. 6-10 years).
• Quantitative comparisons were made between the Frank and McFee-Parungao lead systems for various ECG parameters.

Main Results:

• Significant differences in QRS voltages were observed between the 2-5 and 6-10 year age groups, including greater Z anterior and initial/terminal X right voltages in younger children.
• The T vector was oriented more posteriorly in the younger age group.
• The Frank lead system yielded spatial voltages approximately 70% of those from the McFee system, with notable differences in X, Y, and Z components and their ratios.

Conclusions:

• Age significantly impacts orthogonal electrocardiogram parameters in children, affecting QRS voltages and T vector orientation.
• The Frank and McFee-Parungao lead systems exhibit systematic quantitative differences, influencing spatial voltage measurements.
• These findings highlight the importance of age-specific reference values and lead system considerations in pediatric electrocardiography.