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Overview of Systemic Veins01:11

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Systemic veins are crucial blood vessels that return deoxygenated blood from various body tissues back to the heart. There are three systemic veins that return deoxygenated blood to the heart, they are as follows.
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Pulmonary Veins Function as Echo Chambers in Persistent Atrial Fibrillation: Circuitous Re-Entry Generates Outgoing

Shu Meng1, Ahmed M Al-Kaisey2, Ramanathan Parameswaran2

  • 1Auckland Bioengineering Institute, University of Auckland, Auckland New Zealand.

JACC. Clinical Electrophysiology
|May 16, 2024
PubMed
Summary

Pulmonary veins (PVs) in persistent atrial fibrillation (PeAF) primarily sustain the arrhythmia through circuitous re-entry, acting as "echo chambers" rather than direct drivers. This finding refines ablation strategies for PeAF.

Keywords:
3-dimensionalatrial fibrillationfibrillatory driversintracardiac electric mappingphase mapping

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Devices

Background:

  • Pulmonary vein isolation (PVI) is the standard treatment for persistent atrial fibrillation (PeAF).
  • However, the substrate for PeAF extends beyond the pulmonary veins (PVs).

Purpose of the Study:

  • To investigate the mechanism of outgoing wavefronts (WFs) originating from the PV sleeves during PeAF.
  • To understand the role of PV sleeves in sustaining PeAF.

Main Methods:

  • Recruited 11 patients undergoing first-time PeAF ablation.
  • Utilized a 64-electrode catheter and inverse mapping to reconstruct electrograms on the PV surface.
  • Analyzed phase maps to identify and classify wavefront activity within PV sleeves.

Main Results:

  • PVs generated outgoing WFs at a frequency of 3.7 s⁻¹ during PeAF.
  • Circuitous macroscopic re-entry was the dominant mechanism (2.7 s⁻¹), initiated by incoming WFs in 80% of cases.
  • The ratio of outgoing to incoming WF frequency (R) was > 1 in 6 of 11 PVs, indicating amplification.

Conclusions:

  • PV sleeves generate electric activity in PeAF mainly through circuitous re-entry.
  • PVs function as
  • echo chambers
  • amplifying and sustaining atrial fibrillation rather than acting as primary drivers.