Influence of bipolar esophageal electrode positioning on measurements of human crural diaphragm electromyogram
Influence of bipolar esophageal electrode positioning on measurements of human crural diaphragm electromyogram
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DOI：
10.1152/jappl.1996.81.3.1434
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发表时间：
1996-09-01
影响因子：
3.3
通讯作者：
Grassino, A
中科院分区：
文献类型：
--
作者：
Beck, J;Sinderby, C;Grassino, A
我们的目的是描述如何在食管裂孔内的不同位置处过滤人类膈肌肌电图（EMGdi），即，当用安装在食管导管上的双极电极对阵列获得时，在隔膜的附近。我们将覆盖食管的电活动腿膈肌肉系统定义为膈的电活动区域（ERF（di）），其中心为ERF（di）中心。EMGdi信号通过多阵列食管导管获得，该导管由具有三种不同电极配置的七个连续电极对组成。受试者（n = 5）在功能残气量下进行膈肌自主收缩。信号的目视检查显示在中心的两侧信号极性反转。对于在中心两侧的信号相关性，观察到极端相关值（在0 ms时间偏移时r值接近-1）;从中心（尾部和头部）向外围移动，RMS增加到峰值（对于不同的电极配置，范围为2.1-4.1 dB），然后对于大多数外围电极对降低。从RMS值达到峰值的位置开始，中心频率值在中心处增加（对于不同的电极配置，范围为26-29 Hz）。计算机模拟得到了与实验结果相似的数据。我们的结论是，在中心频率和RMS值的严重影响的中心频率（di），可以确定的cia互相关分析的中心（di）。
We aimed to describe how the human diaphragm electromyogram (EMGdi) is filtered at different positions within the esophageal hiatus, i.e., in the close proximity of the diaphragm, when obtained with an array of bipolar electrode pairs mounted on an esophageal catheter. We defined the electrically active crural diaphragm musculature that covers the esophagus as the electrically active region of the diaphragm (EAR(di)) and its center as the EAR(di) center. EMGdi signals were obtained via a multiple-array esophageal catheter consisting of seven sequential electrode pairs with three different electrode configurations. Subjects (n = 5) performed voluntary contractions of the diaphragm at functional residual capacity. Visual inspection of the signals revealed reversal of signal polarity on either side of the EAR(di) center. Extreme correlation values (r values close to -1 at 0-ms time offset) were observed for the correlation of signals on either side of the EAR(di) center; moving peripherally from the EAR(di) center (caudally and cephalad), the RMS increased to a peak (range of 2.1-4.1 dB for the different electrode configurations) and then decreased for the most peripheral electrode pairs. From a position where the RMS values peaked, center frequency values increased at the EAR(di) center (range of 26-29 Hz for the different electrode configurations). Computer simulation yielded similar data to the experimental results. We conclude that electride positioning within the EAR(di) severely influences center frequency and RMS values and that the center of the EAR(di) can be identified cia cross-correlation analysis.