Centre of Excellence (Industrial and Product Design), Punjab Engineering College, Chandigarh, India.
ECE Department, PEC Chandigarh, Chandigarh, India.
J Healthc Eng. 2020 Feb 27;2020:4643584. doi: 10.1155/2020/4643584. eCollection 2020.
This study examines the alterations in scalp recorded cortical activity due to surgical incision in anaesthetized cardiac patients using electroencephalogram (EEG) patterns. The primary aim was to compare the changes in electrocortical activity after surgical incision. The secondary aim was to compare the changes in time, frequency, and wavelet domain parameters after loss of consciousness (LoC) and after intubation. Real-time EEG data were recorded from 19 patients undergoing cardiac surgery and signals were quantified with time, frequency, and wavelet domain parameters. An increase in hjorth activity, hjorth complexity, rms value, total band power, relative delta band power, standard deviation and maxima of approximation coefficients ( ), minima of detail coefficients ( , , and ) and decrease in hjorth mobility; approximate entropy; relative theta, alpha, and beta band power; specentropy; median, spectral edge, and mean frequency; mean of detail coefficients ( ); standard deviation of detail coefficients ( , , and ); maxima of detail coefficients ( ); and minima of approximation coefficients ( ) were observed during LoC. Decrease in hjorth activity; hjorth mobility; rms value; total band power; relative theta band power; median frequency; standard deviation of coefficients ( , , , and ); and maxima of coefficients ( , , , and ) and increase in hjorth complexity; mean of detail coefficients ( ); and minima of coefficients ( , , , and ) were observed after intubation. Significant decrease in hjorth activity; hjorth mobility; total band power; relative alpha band power; specentropy; median and mean frequency; standard deviation and maxima of detail coefficients ( , , and ) and increase in rms value; relative delta band power; mean of coefficients ( and ); and minima of coefficients ( , , and ) were observed due to surgical incision. It can be concluded that different spectral and temporal parameters of EEG signals are highly sensitive to induction, intubation, and surgical incision which are potentially informative for measuring the depth of anaesthesia or efficacy of anaesthetic agents.
本研究使用脑电图（EEG）模式检查麻醉心脏患者手术切口引起的头皮记录皮质活动的改变。主要目的是比较手术切口后皮质电活动的变化。次要目的是比较意识丧失（LoC）后和插管后时间、频率和小波域参数的变化。从 19 名接受心脏手术的患者中实时记录 EEG 数据，并使用时间、频率和小波域参数对信号进行量化。在 LoC 期间观察到 hjorth 活动、hjorth 复杂度、rms 值、总频带功率、相对 delta 频带功率、标准偏差和近似系数的最大值 ( )、细节系数的最小值 ( 、 、和 ) 和 hjorth 移动性的增加；近似熵；相对 theta、alpha 和 beta 频带功率；specentropy；中位数、谱边缘和平均频率；细节系数的平均值 ( )；细节系数的标准偏差 ( 、 、和 )；细节系数的最大值 ( )；和近似系数的最小值 ( )。在插管后观察到 hjorth 活动的减少；hjorth 移动性；rms 值；总频带功率；相对 theta 频带功率；中位数频率；系数的标准偏差 ( 、 、 、和 )；和系数的最大值 ( 、 、 、和 ) 和 hjorth 复杂度的增加；细节系数的平均值 ( )；和系数的最小值 ( 、 、 、和 )。由于手术切口，观察到 hjorth 活动、hjorth 移动性、总频带功率、相对 alpha 频带功率、specentropy、中位数和平均频率、细节系数的标准偏差和最大值 ( 、 、和 ) 的显著减少；相对 delta 频带功率；系数的平均值 ( 和 )；和系数的最小值 ( 、 、和 )。可以得出结论，EEG 信号的不同光谱和时间参数对诱导、插管和手术切口非常敏感，这对于测量麻醉深度或麻醉剂的效果具有潜在的信息意义。
