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Normal and Abnormal Atrial Anatomy Relevant to Atrial Flutters: Areas of Physiological and Acquired Conduction Blocks

S Yen Ho1

  • 1Royal Brompton Hospital, Imperial College London, Sydney Street, London SW3 6NP, United Kingdom.

Cardiac Electrophysiology Clinics
|September 24, 2022
PubMed

Insights

This review explores atrial chamber anatomy, highlighting how the cavotricuspid isthmus

Area of Science:

  • Cardiovascular Anatomy
  • Cardiac Electrophysiology

Background:

  • Atrial flutter is often caused by re-entrant circuits within the atria.
  • Understanding atrial structure is crucial for identifying arrhythmogenic substrates.

Purpose of the Study:

  • To review atrial chamber structure and its relation to atrial flutter.
  • To identify anatomical bases for conduction obstacles and barriers.

Main Methods:

  • Review of existing literature on atrial anatomy and atrial flutter.
  • Analysis of myocardial arrangement, composition, and myoarchitecture.

Main Results:

  • The cavotricuspid isthmus' complex myocardial structure may create slow conduction zones.
  • Prominent atrial muscle bundles and interatrial pathways can facilitate preferential conduction.
  • Tissue damage from aging or surgery can lead to re-entry circuits.

Conclusions:

  • Atrial anatomy, particularly the cavotricuspid isthmus, plays a key role in atrial flutter.
  • Myoarchitectural features and tissue alterations contribute to arrhythmogenesis.

Keywords:
Bachmann’s bundleCavotricuspid isthmusMitral isthmusMyoarchitectureRight atriumVestibule

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