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Cardiac memory in canine atrium : identification and implications.

B Herweg1, F Chang, P Chandra

  • 1Department of Pharmacology, College of Physicians and Surgeons of Columbia University, New York, NY 10032, USA.

Circulation
|February 7, 2001
PubMed
Summary
This summary is machine-generated.

Cardiac memory occurs in the canine atrium, rapidly developing and resolving with pacing. This phenomenon, linked to a shorter refractory period, may promote atrial arrhythmias.

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Cardiac Physiology

Background:

  • Cardiac memory, a phenomenon previously observed in the ventricle, is hypothesized to occur in the atrium.
  • Atrial memory could play a role in modulating cardiac rhythm.

Purpose of the Study:

  • To investigate the presence and characteristics of cardiac memory in the canine atrium.
  • To determine the effect of pacing site and rate on atrial memory.
  • To assess the relationship between atrial memory and effective refractory period.

Main Methods:

  • Conscious, chronically instrumented dogs with complete heart block were studied.
  • Atrioventricular sequential pacing was performed from the right atrium (RA) and left atrial appendage (LAA) at varying rates.
  • P and Ta waves, spatial atrial gradient vectors, and effective refractory periods were analyzed.

Main Results:

  • Pacing from the LAA, particularly at rapid rates, altered P and Ta waves, indicating cardiac memory.
  • Displacement of the spatial atrial gradient vector during recovery from LAA pacing demonstrated memory accumulation and resolution.
  • A decrease in the right effective refractory period was observed concurrently with atrial memory.

Conclusions:

  • Cardiac memory is demonstrable in the canine atrium, characterized by rapid onset, accumulation, and resolution upon pacing cessation.
  • Atrial memory is associated with a reduced effective refractory period.
  • The findings suggest that atrial memory may contribute to the substrate for atrial arrhythmias.