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窦房结电图、希氏束电图及晚电位的体表检测具有临床实用价值。然而,由于这类电位在体表上所反映的幅度仅为10～20微伏,甚至几微伏,因此它们往往被各种背景噪声所淹没。要想观察到这类微弱心电信号,仅仅提高放大器的增益是无济于事的。即使在放大了的心电波形中能看到相应电位的迹象,往往由于整个心电图的质量不高,波形的识别、参数的测量也极为困难,容易出现误差。可见,提高信噪比是微弱心电信号体表检测的关键。
Sinus node electrogram, His bundle and late potential body surface detection has clinical value. However, these potentials are often overwhelmed by a variety of background noises because they reflect on the body surface only 10 to 20 microvolts, or even a few microvolts. To observe such weak ECG signals, simply boosting the gain of the amplifier is of no avail. Even in the enlarged ECG waveform can see the signs of the corresponding potential, often due to the quality of the ECG is not high, the waveform recognition, parameter measurement is extremely difficult, prone to error. Can be seen to improve the signal to noise ratio is the key to the body surface detection of weak ECG signal.