窦房结(SN)电活动信号比较微弱,在犬心脏窦房结部位的心外膜上检测到窦房结电位(SNP)的幅度仅50—230μV,而众多因素可干扰SNP的检测。尤其是一些干扰信号的特征类似于窦房结电图(SNE),增加了记录的困难,容易发生误认。国内文献对无创性的检测方法,如食管内和体表记录SNE以及有创性的心内检测提出了不少疑问。为此,我们采用电子计算机模拟产生SN电活动信号,将信号输入犬心脏,观察机体各部位对其衰减情况,力图从另外一个角度探索比较可靠的记录SNE的部位和方法。 Sinus node (SN) electrical activity signal is relatively weak, the sinus node potential (SNP) detected in the epicardial sinus heart only about 50-230μV, and many factors can interfere with the detection of SNP. In particular, some disturbing signals are similar in features to sinoatrial node electrocardiography (SNE), which increases the difficulty of recording and is prone to misidentification. Domestic literature on non-invasive detection methods, such as intra-esophageal and superficial recording of SNE and invasive in-heart testing raised many questions. To this end, we use computer simulation to generate SN electrical activity signal, the signal input dog heart, observe the attenuation of various parts of the body, trying to explore a more reliable site to record SNE and methods.