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通过用25～250Hz、40～250Hz、80-250Hz 三种不同的高带通双向数字滤波体表信号平均方法,定量分析正常人和有症状的室速患者的心室晚电位表明:随着高带通滤波频率的升高,HFRWS 减小,HFQRSD 缩短,HFLAD 有延长的改变;不同的高带通滤波对心室晚电位的诊断标准有一定影响。25Hz 有较高的特异性,而80Hz 有较好的敏感性。不同的心室晚电位诊断标准有不同的敏感性和特异性。当25Hz,HFRMS_(40)≤25uV,HFQRSD≥120ms,HFLAD≥40ms;当40Hz 时,HFRMS_(40)≤20uV,HFQRSD≥120ms,HFLAD≥40ms;当80Hz 时,HFRMS_(40)≤15uV,HFQRSD≥110ms,HFLAD≥50ms 时均能较好地区分正常组和室速组。
The ventricular late potentials in normal subjects and patients with symptomatic ventricular tachycardia were quantified by using three different high-band-pass bi-directional digital filter surface signal averaging techniques at 25-250 Hz, 40-250 Hz, and 80-250 Hz, indicating that as the high band The increase of the filtering frequency, the reduction of HFRWS, the shortening of HFQRSD, and the prolongation of HFLAD change; different high bandpass filters have certain influence on the diagnostic criteria of ventricular late potentials. 25Hz has a higher specificity, while the 80Hz has better sensitivity. Different ventricular late potential diagnostic criteria have different sensitivities and specificities. When 40Hz, HFRMS_ (40) ≤20uV, HFQRSD≥120ms, HFLAD≥40ms; HFRAD_ (40) ≤15uV, HFQRSD≥80ms when the frequency is 25Hz, HFRMS_ (40) ≤25uV, HFQRSD≥120ms, HFLAD≥40ms; 110ms, HFLAD ≥ 50ms can be a good distinction between normal group and VT group.