采用程控双时值放大器检测体表窦房结电图,根据T波的形态与大小,选用单时值或双时值,消除高大T波通过放大器的耦合电容器所引起的伪差,使P前波清晰,起始点明确。通过200例体表窦房结电图的分析,提出使用单时值和双时值的条件和方法。 A programmable dual-time amplifier is used to detect the surface sino-atrial node electrogram. According to the shape and size of the T-wave, the single-time value or double-time value is selected to eliminate the artifact caused by the coupling capacitor of the high T wave through the amplifier, Wave clear, the starting point is clear. Based on the analysis of the sino-atrial electrogram of 200 cases, the conditions and methods of using single-time and double-time are proposed.