소아에서 연령에 따른 Signal Averaged ECG의 Time Domain 변수들에 대한 연구

Abstract

Signal averaged electrocardiography (SAECG) is a computerized processing technique that greatly enhances the resolution of the surface electrogram so thats low amplitude cardiac potentials can be recorded from body surface.

Ventricular late potential is low amplitude high frequency signal located at the end of the QRS complex and can be detected on the surface using SAECG.

The purpose of this study is to examine age - related differences of SAECG parameters in children. SAECGs were obtained in 59 children with normal hearts on physical examinations, 12-lead ECGs, and chest roentgenograms. They were divided into 4 groups depending on age (group 1: 1day to < 1year; group 2: 1year to < 6years; group 3: 6years to < 10years; group 4: 10years to < 15years). The root mean square voltage (RMS), the filtered QRS duration and the duration of the low amplitude signal (LAS) were measured using 40 Hz filters.

The results showed that filtered QRS duration correlated wish original QRS duration and was lowest in infancy and increased thereafter with age. RMS inversely correlated with filtered QRS duration and was higher in infancy compared with older age group (p<0.05). RMS was not significantly different in group 2 and 3, but RMS of group 4 was significantly lower compared with younger group (p<0.01). The age related normative data of RMS could not be determined due to wide variation of raw data. LAS showed increasing tendency with age but was not statistically significant between groups.

The age-related difference of each parameter on SAECG should be considered for ventricular late potentials and normative data for all variables of SAECG should be determined in larger number of children.

Signal averaged electrocardiography (SAECG) is a computerized processing technique that greatly enhances the resolution of the surface electrogram so thats low amplitude cardiac potentials can be recorded from body surface.

Ventricular late potential is low amplitude high frequency signal located at the end of the QRS complex and can be detected on the surface using SAECG.

The purpose of this study is to examine age - related differences of SAECG parameters in children. SAECGs were obtained in 59 children with normal hearts on physical examinations, 12-lead ECGs, and chest roentgenograms. They were divided into 4 groups depending on age (group 1: 1day to < 1year; group 2: 1year to < 6years; group 3: 6years to < 10years; group 4: 10years to < 15years). The root mean square voltage (RMS), the filtered QRS duration and the duration of the low amplitude signal (LAS) were measured using 40 Hz filters.

The results showed that filtered QRS duration correlated wish original QRS duration and was lowest in infancy and increased thereafter with age. RMS inversely correlated with filtered QRS duration and was higher in infancy compared with older age group (p<0.05). RMS was not significantly different in group 2 and 3, but RMS of group 4 was significantly lower compared with younger group (p<0.01). The age related normative data of RMS could not be determined due to wide variation of raw data. LAS showed increasing tendency with age but was not statistically significant between groups.

The age-related difference of each parameter on SAECG should be considered for ventricular late potentials and normative data for all variables of SAECG should be determined in larger number of children.