Scott W A, Donnerstein R L
Department of Pediatrics (Cardiology), University of Arizona Heart Center, Tucson.
Pacing Clin Electrophysiol. 1990 Dec;13(12 Pt 1):1559-62. doi: 10.1111/j.1540-8159.1990.tb06852.x.
Signal averaged atrial activity recorded from the body surface is finding increased use in assessing atrial arrhythmias. The process of signal averaging is critically dependent upon precise alignment of the waveform of interest. The alignment accuracy of wide (0.01-300 Hz) and narrow (10-300 Hz) bandpass filtered P waves recorded from the body surface were compared to atrial electrograms recorded from temporary pacing wires. The locations of the filtered P waves relative to the atrial electrogram were calculated beat-by-beat for 100 beats in 15 patients aged 1 month to 71 years. The standard deviation of the alignment error for the wide filtered surface P wave averaged 1.7 +/- 0.8 msec and for the narrow filtered P waves was 0.8 +/- 0.4 ms. These results demonstrate that high pass filtering will improve alignment accuracy, and therefore, improve frequency resolution for the analysis of signal averaged P waves.
从体表记录的信号平均心房活动在评估房性心律失常中的应用越来越广泛。信号平均过程严重依赖于感兴趣波形的精确对齐。将从体表记录的宽（0.01 - 300 Hz）和窄（10 - 300 Hz）带通滤波P波的对齐精度与从临时起搏导线记录的心房电图进行比较。在15名年龄从1个月到71岁的患者中，逐搏计算100次搏动中滤波后P波相对于心房电图的位置。宽滤波体表P波对齐误差的标准差平均为1.7 +/- 0.8毫秒，窄滤波P波的标准差为0.8 +/- 0.4毫秒。这些结果表明，高通滤波将提高对齐精度，从而提高信号平均P波分析的频率分辨率。
