Filtering of electromyogram artifacts from the electrocardiogram
Filtering of electromyogram artifacts from the electrocardiogram
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DOI：
10.1016/s1350-4533(99)00098-3
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发表时间：
1999-12-01
影响因子：
2.2
通讯作者：
Daskalov, IK
中科院分区：
文献类型：
--
作者：
Christov, II;Daskalov, IK
肌电图（EMG）伪影经常污染心电图（ECG）。与例如电力线干扰相比，由于它们的随机特性以及从同一对电极获得的ECG和EMG信号的频谱的相当大的重叠，它们更难以抑制或消除。通常应用的低通滤波（截止频率最小为35 Hz）导致对EMG伪影的有限抑制和对尖锐Q、R和S ECG波振幅的显著降低。提出了一种解决这个问题的方法，即根据ECG信号的斜率，采用动态变化的样本数和加权系数进行近似滤波。所使用的斜率测量是沿信号沿着滑动的两个相邻10 ms段的倾斜的乘积的绝对值。结果表明，一些较尖锐的QRS波群略有扩大，但其幅度的虚拟保存和相当大的减少的EMG伪影。(C)2000 IPEM。由Elsevier Science Ltd.出版，版权所有。
Electromyogram (EMG) artifacts often contaminate the electrocardiogram (ECG). They are more difficult to suppress or eliminate, compared for example to the power line interference, due to their random character and to the considerable overlapping of the frequency spectra of ECG and EMG signals obtained from the same pair of electrodes. The usually applied low-pass filtering (cutoff frequency of minimum 35 Hz) results in limited suppression of the EMG artifact and considerable reduction of sharp Q, R and S ECG wave amplitudes. A solution to this problem is proposed by applying approximation filtering with dynamically varied number of samples and weighting coefficients, depending on the ECG signal slope. The slope measure used is the absolute value of the product of the tilts of two adjacent 10 ms segments sliding along the signal. The results obtained show a slight widening of some sharper QRS complexes, but a virtual preservation of their amplitudes and a considerable reduction of the EMG artifact. (C) 2000 IPEM. Published by Elsevier Science Ltd. All rights reserved.