6511型心电图机滤波功能对不同频率心电信号的影响

Impact of 6511-type ECG filtering on ECG signals of different frequency

在日本光电ECG-6511型心电图机上以不同频率的脉冲为模拟信号,按未漏波(OFF)、肌电漏波(EMG)、交流电漏波(HUM)和肌电漏波+交流电漏波(EMG+HUM)4种滤波状态绘制幅频线.结果显示,在OFF状态下电压无衰减,使用EMG、HUM、(EMG+HUM)时电压幅度随信号频率变化而变化,心脏病变(特别是心肌疾病)时,滤波可能会造成部分极具临床诊断价值的心电信号的衰减与失真,从而造成漏诊,临床心电图工作者要尽量不使用滤波功能,而需通过采用一些切实可行的干预措施来减少或消除机外干扰对心电信号的影响.

On 6511-type ECG in a different frequency on the pulse for the analog signal, according to OFF, EMG, HUM and EMG ＋ HUM, four mapping filtering state, the amplitude-frequency lines were drawn. When the lines show the OFF state, voltage does not attenuate and when using EMG, HUM, EMG ＋ HUM state, voltage decreases with the increasing of pulse frequency. Based on the design principles of 6511-type ECG in filtering function the amplitudefrequency lines were ill ustrated theoretically, and heart disease, especially cardiomyopathies changes were determined, filtering will obviously result in ECG signals＇ attenuation and distortion, resulting in missed diagnosis. Therefore, clinical ECG workers are proposed as far as possible not to use filtering, but to use of a number of practical interventions to reduce or eliminate outside interference on the impact of ECG.