Interatrial blocks: diagnosis and clinical significance

Med Clin (Barc). 2020 Sep 11;155(5):207-214. doi: 10.1016/j.medcli.2020.03.011. Epub 2020 Jul 25.
[Article in English, Spanish]


In 1979 Bayés de Luna described interatrial blocks (IAB). Following the same principle of classification of blocks in other structures of the heart, he divided them into first (partial IAB), second (atrial aberrancy) and third degree (advanced IAB). Atypical forms of these blocks were recently described. There is evidence that delays or blocks of conduction in the Bachmann bundle constitute the mechanistic basis of these blocks. The association between IAB, mainly those of advanced grade, and atrial tachyarrhythmias is already constituted science, and is referred to by the medical community as Bayés syndrome. IABs are also associated with the occurrence of ischaemic stroke and recurrence of atrial fibrillation in several scenarios. This review presents classical aspects and sheds light on the interpretation of this electrocardiographic pattern in clinical practice.

Keywords: Bachmann bundle; Bloqueos interauriculares; Electrocardiogram; Electrocardiograma; Haz de Bachmann; Interatrial blocks.

Publication types

  • Review

MeSH terms

  • Bayes Theorem
  • Brain Ischemia*
  • Electrocardiography
  • Heart Atria / diagnostic imaging
  • Humans
  • Interatrial Block / diagnosis
  • Male
  • Stroke* / diagnosis