限幅技术在临床心电信号记录中的应用

以心电信息的电生理机制和电压效应理论为基础，探讨如何利用限幅技术实现临床最佳记录效果。经临床试验证明，限幅技术的应用，使得心电生理检查中微弱信号（如希氏束电图中的H波）获得不失真放大，同时被过度放大的信号初始清晰，并有利于波形信号极性确认，而且每导之间互不干扰重叠，此外，在经食管心电生理的记录中，过大的脉冲也因实施了限幅技术而被限制在特定的电平内，不仅明显提高了记录质量，而且也保护了心电记录设备。

The Use of Limit Amplitude Technique in ClinicalCardiac Electrical Signal Recording

Based on the electrophysiologic mechanism of cardiac electrical action and the theory of voltage effect, the limit amplitude technique was employed to obtain the best clinical record effects. The results showed that limiter could limit the oversize signals overlapping each other and make the tiny signals magnification whthout distortion, such as the His bundle deflection in His Bundel Electrogram. At the same time, all signals recorded at multichannel physiologic recorder were clear and did not interfere with each other. Furthermore, the limiter not only improved the recording quality but also protected the cardiac electronic equipment because overdue stimulation signal was limited at a given electronic level during the recording of transesophageal pacing.