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Frequency Spectrum Analysis of the Entire Low Amplitude Late QRS Potential
Author(s): 
Pages: 1-5
Year: Issue:  4
Journal: Chinese Journal of Medical Physics

Keyword:  心电描计术心动过速心室晚电位;
Abstract: The results of frequency spectrum analysis of signal—averaged electrocardiogram with Fast Fourier Transformation were studied on A and B windows in 17 patients with ventricular tachycardia(VT, group Ⅰ), 22 patients with coronary heart disease without VT(group Ⅱ)and 20 healthy volunteers(group Ⅲ). The onsets both A and 13 windows were selected from vector-summed QRS magnitude and individual absolute filter lead when QRS forces last decreased to below 40 uV and had a duration of 120ms. High frequency spectral area(HFA,60-120Hz) was calculated. Results in both A and B windows had significant difference among three groups (P<0.01). The criteria of HFA>1240 uV for B window gave a sensitivity of 88.24%, specificity of 97.62% and odds ratio of 20.15. The criteria of HFA>740 uV for A window gave a sensitivity of 64.71%, specificity of 95.24% and odds ratio 6.48. We think that A window is superior to B window.
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