Reiffel J A, Gang E, Livelli F, Gliklich J, Bigger J T
Am Heart J. 1981 Dec;102(6 Pt 1):1011-4. doi: 10.1016/0002-8703(81)90484-1.
When AV conduction is normal, the absence of VA conduction is not abnormal. Analogous information about retrograde sinoatrial conduction is not available. Although the premature atrial stimulas (PAS) technique can demonstrate the presence of sinoatrial entrance block (SAEB), both its prevalence and its relationship to antegrade SA conduction are unknown. Using PAS, we determined the incidence of SAEB in 59 patients with known or suspected dysrrhythmias or conduction defects to be 6.8%. Using catheter recorded sinus node electrograms (SNE), we then directly measured sinoatrial conduction time (SACT) in three patients with SAEB. Antegrade SACT was normal in two and prolonged in one. Only the latter had sinus node dysfunction recognized by ECG and/or conventional sinus node testing. We conclude that SAEB occurs infrequently, may occur when antegrade SACT is normal, is probably analogous to behavior at the AV node, and should not be used as an indicator of sick sinus syndrome.
当房室传导正常时，室房传导缺失并非异常。关于逆行窦房传导的类似信息尚无定论。尽管房性期前刺激（PAS）技术可证实窦房入口阻滞（SAEB）的存在，但其发生率及其与顺行窦房传导的关系均不明确。我们采用PAS测定了59例已知或疑似心律失常或传导缺陷患者中SAEB的发生率为6.8%。然后，我们使用导管记录的窦房结电图（SNE），直接测量了3例SAEB患者的窦房传导时间（SACT）。2例患者的顺行SACT正常，1例延长。仅后者经心电图和/或传统窦房结检查发现有窦房结功能障碍。我们得出结论，SAEB发生率较低，可能在顺行SACT正常时发生，可能类似于房室结的情况，不应将其用作病态窦房结综合征的指标。
