窦性心动过缓(SB)既可见于迷走神经张力增高的健康人,又是病态窦房结综合征(SSS)患者的最常见、最早期的征象。对二者的鉴别,常用运动试验和阿托品试验,但敏感性及特异性均不够理想;尽管采用心内或经食道心房超搏测定窦房结恢复时间(SN RT)的诊断价值较高,但其方法学及评定标准还值得进一步探讨;因此,在临床工作中,当患者出现单项甚至两项上述试验阳性,特别是边缘性阳性结果时,临床医生对于 SB 性质的判断常常仍感困难。为此,我们分别在自主神经阻滞(ANB)前后,用经食道心 Sinus bradycardia (SB) is found in both healthy people with increased vagal tone and is the most common and earliest sign of sick sinus syndrome (SSS). However, the sensitivity and specificity are not ideal enough. Although the diagnosis of sinus node recovery time (SN RT) by intracardiac or trans-esophageal atrial ultra-pacing is higher, Its methodology and assessment criteria deserve further discussion; therefore, clinicians often find it difficult to judge the nature of SB when patients have single or even two positive tests, especially marginal positive results in clinical practice. To this end, we have autonomic nerve block (ANB) before and after, with the heart of the esophagus