Importance of isthmus structure in the right atrium

Jiunn Lee Lin, Ling Ping Lai, Liang Yu Lin, Chia Ti Tsai, Chih Chieh Yu

Research output: Chapter in Book/Report/Conference proceedingChapter


Being the chamber receiving systemic venous return, the right atrium is a structure of morphological mosaic, comprising the smooth vestibule, the septum, the trabeculated appendage and junctional crista terminalis, the Eustachian ridge, the fanning pectinate muscle, and the tendon of Todaro. The mosaic milieu by itself predisposes to the formation of reentrant atrial tachyarrhythmias. Meanwhile, the right atrium is also common with secondary isthmus structures resulting from surgical iatrogenic scars or stretch-related spontaneous scars. Inside the heterogenous scars, between adjacent scars, and between natural structural barriers and the scars, there are also facilitated opportunities of creating clinical microreentrant (focal) and macroreentrant atrial tachyarrhythmias.

Original languageEnglish
Title of host publicationCardiac Arrhythmias
Subtitle of host publicationFrom Basic Mechanism to State-of-the-Art Management
PublisherSpringer-Verlag London Ltd
Number of pages17
ISBN (Electronic)9781447153160
ISBN (Print)1447153154, 9781447153153
Publication statusPublished - Nov 1 2013
Externally publishedYes


  • Atrial arrhythmia
  • Isthmus
  • Right atrium

ASJC Scopus subject areas

  • Medicine(all)


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