摘要1 IntroductionIt was not until 1979 that Bayés de Luna described atrial conduction blocks and classified them as interatrial and intraatrial.[1] Interatrial blocks refer to conduction disorders located between the atria,while intraatrial blocks occur within the same atrium.This work motivated several authors,including Bayés himself,to further investigate atrial conduction and interatrial block (IAB).In the following years,the anatomy of the interatrial electrical system was studied in depth.A particular emphasis was placed on the Bachmann's region,as the pathophysiology of lAB is directly related to a block in this area.In a recent consensus,various authors agreed on the definitions of IAB,emphasizing its epidemiology and prevalence.[2]