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本项研究的目的是要讨论正常受试者的信号平均心电图(SAECG):1.不同滤波频率下假阳性的发生率和晚电位标准,2.晚电位在整个期间的重复性。在46名正常志愿受检者中,QRS 向量大小以25、40和100Hz 的频率双向高通滤波。当高通滤波频率增加时,QRS 持续时间从98±9 ms 减至92±ms(P<0.0001),终末 QRS 均方根电压从60±41μV 降至14±9μV(P<0.0001),同时终末 QRS 低幅信号持续时间从27±7ms 增至41±14ms(P<0.0001)。对于单独的参数而言,假阳性试验的发生率在2%到41%之间,而使用异常 QRS 持续时间结合均方根电压或低幅信号持续时间都未有假阳性结果。在6.4±0.3个月后对26名受检者进行了
The purpose of this study was to discuss the SAECG of normal subjects: 1. The incidence of false positives and the late potentials at different filtering frequencies; 2. The repeatability of the late potentials throughout the period. In 46 normal volunteers, the QRS vector size was bidirectionally high-pass filtered at 25, 40 and 100 Hz. The QRS duration decreased from 98 ± 9 ms to 92 ± ms (P <0.0001) and terminal QRS rms decreased from 60 ± 41 μV to 14 ± 9 μV (P <0.0001) as the high-pass filtering frequency increased Last QRS low amplitude signal duration increased from 27 ± 7 ms to 41 ± 14 ms (P <0.0001). For individual parameters, the incidence of false positives was between 2% and 41%, whereas no false positives were reported using abnormal QRS durations combined with rms voltage or low amplitude signal durations. Twenty-six subjects were examined after 6.4 ± 0.3 months