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近十年来QRS波切迹(notch)受到人们的重视。包含高频成份的所谓高保真ECG中QRS波的切迹和拖迹(slur)已用于研究各种心肌疾病。作者从12个麻醉狗体取得具有切迹和拖迹的高保真ECG波形。用计算机进行数字平均并用不同的带宽进行数字滤波来确定切迹和拖迹的频率范围。先对这种低噪声的平均波形进行低通滤波,逐渐降低通频带的上限,直到检测不到切迹(或拖迹),从而确定其频率下限。然后
In the past ten years, QRS wave notch has drawn great attention. The QRS wave track and slur in the so-called high fidelity ECG containing high-frequency components have been used to study a variety of myocardial diseases. The authors obtained high-fidelity ECG waveforms with notch and trail from 12 anesthetized dog bodies. Digitally averaging the computer and digitally filtering with different bandwidths to determine the frequency range of the notch and trail. This low-noise averaged waveform is first low-pass filtered to gradually lower the upper passband until no notch (or trail) is detected, thereby determining its lower frequency limit. then