Dickhaus H, Khadra L, Brachmann J
Department of Medical Informatics, University of Heidelberg, Germany.
Methods Inf Med. 1994 May;33(2):187-95.
The time-frequency characteristics are studied of averaged and filtered ECG records from 21 patients with sustained ventricular tachycardia and 29 healthy control subjects. Simulated data as well as real ECG records reveal the detection accuracy of the wavelet transform of signals with late potentials. The wavelet-transforms of preprocessed ECG signals are plotted in the time-frequency plane. These representations of the signals are well suited to describe the different characteristics of the patients and healthy subjects. A quantitative discrimination was performed with a sensitivity of 90% and a specificity of 72% by the energy underneath the squared modulus of the time-frequency distribution plots of the computed wavelet transforms.
研究了21例持续性室性心动过速患者和29例健康对照者平均及滤波后的心电图记录的时频特征。模拟数据以及真实心电图记录揭示了具有晚电位的信号的小波变换的检测准确性。预处理后的心电图信号的小波变换绘制在时频平面上。这些信号表示非常适合描述患者和健康受试者的不同特征。通过计算得到的小波变换的时频分布图的平方模量下方的能量进行了定量判别，灵敏度为90%，特异度为72%。
