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Why does atrial fibrillation occur?

M J Janse1

  • 1Department of Clinical and Experimental Cardiology, University of Amsterdam, The Netherlands.

European Heart Journal
|May 1, 1997
PubMed
Summary
This summary is machine-generated.

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Atrial enlargement and fibrosis contribute to atrial fibrillation by altering electrical properties and promoting re-entry pathways. These changes, including fibrosis and electrical remodeling, are crucial for the development and persistence of this arrhythmia.

Area of Science:

  • Cardiology
  • Electrophysiology
  • Cardiac Pathophysiology

Background:

  • Atrial fibrillation is linked to atrial enlargement and stretch, which can alter electrophysiological properties.
  • Acute stretch effects differ from chronic stretch, with fibrosis being a key factor in long-term atrial enlargement.

Purpose of the Study:

  • To investigate the electrophysiological alterations associated with atrial enlargement and fibrillation.
  • To understand the role of fibrosis and electrical remodeling in the maintenance of atrial fibrillation.

Main Methods:

  • Analysis of electrophysiological changes in isolated human atria with fibrillation.
  • Comparison of transmembrane potential characteristics and refractory periods in normal versus fibrillating atria.

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Main Results:

  • Fibrillating atria exhibit shorter action potential durations, triangular configurations, and reduced refractory periods.
  • Loss of normal rate adaptation of refractory periods and increased dispersion of refractoriness were observed.
  • Marked fibrosis was noted, contributing to slow, fragmented conduction and favoring re-entry.

Conclusions:

  • Atrial dilatation and fibrosis are significant contributors to the occurrence and maintenance of atrial fibrillation.
  • Electrophysiological remodeling, including shortened refractoriness and dispersion, favors re-entrant circuit formation.
  • Fibrosis leads to inhomogeneities in conduction and refractoriness, promoting re-entry in enlarged atria.