Original Article
A Study on the Frequency Characteristics of Highfrequency Noise Components in Ventricular Late Potentials Measured with a High-resolution Holter Electrocardiograph
2021 年 51 巻 3 号 p. 147-155
詳細
2021 年 51 巻 3 号 p. 147-155
Background: It is known that there is diurnal variation of noise in the measurement of ventricular late potentials (LPs) by high-resolution Holter electrocardiogram (ECG), but the frequency components of the noise have not been sufficiently evaluated.
Objectives: This study aimed to analyze the high-frequency signal intensity of the noise region in ECG signals, evaluate its effect on LP measurements, investigate the cause of the noise, and examine the optimal measurement conditions.
Methods: ECG signals obtained from three XYZ-axis leads were subjected to time-frequency analysis, and the high-frequency signal intensities for each lead at 40 Hz, 80 Hz, 120 Hz, 160 Hz, and 200 Hz were compared and examined in the time series.
Results: No sharp increase or significant attenuation in high-frequency signal intensity was observed with the increase in frequency. The high-frequency signal intensity increased during daytime activity and decreased during nighttime sleep.
Conclusion: The capture of electromyogram signals of respiratory and postural maintenance muscles was thought to be responsible for increased high-frequency noise in high-resolution Holter ECG recordings. Since the high-frequency noise was reduced during nighttime sleep, this timing was considered to be suitable for LP measurements.
