Dipartimento di Tecnologie e Salute, Istituto Superiore di Sanità, Rome, Italy.
Ann Ist Super Sanita. 2009;45(4):427-31. doi: 10.1590/s0021-25712009000400012.
The aim of this study was to assess the effect of filtering techniques on the time-domain analysis of the ECG. Multi-lead ECG recordings obtained from chronic atrial fibrillation (AF) patients after successful external cardioversion have been acquired. Several high-pass filtering techniques and three cut-off frequency values were used: Bessel and Butterworth four-pole and two-pole bidirectional and unidirectional filters, at 0.01, 0.05 and 0.5 Hz low cut-off frequency. As a reference, a beat-by-beat linear piecewise interpolation was used to remove baseline wander, on each P-wave. Results show that ECG filtering affects the estimation of P-wave duration in a manner that depends upon the type of filter used: particularly, the bidirectional filters caused negligible variation of P-wave duration, while unidirectional ones provoked an increase higher than 8%.
本研究旨在评估滤波技术对心电图时域分析的影响。从慢性心房颤动（AF）患者成功电复律后获得多导联心电图记录。使用了几种高通滤波技术和三种截止频率值：贝塞尔和巴特沃斯四极和两极双向和单向滤波器，截止频率为 0.01、0.05 和 0.5 Hz。作为参考，在每个 P 波上，逐拍线性分段插值用于去除基线漂移。结果表明，心电图滤波会影响 P 波持续时间的估计，具体取决于使用的滤波器类型：特别是双向滤波器导致 P 波持续时间的变化可以忽略不计，而单向滤波器则引起高于 8%的增加。
