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Related Experiment Videos

Cardiac memory: a mechanical and electrical phenomenon

R S Alessandrini1, D D McPherson, A H Kadish

  • 1Division of Cardiology, Northwestern University Medical School, Chicago, Illinois 60611, USA.

The American Journal of Physiology
|April 1, 1997
PubMed
Summary
This summary is machine-generated.

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Prolonged ventricular pacing causes lasting changes in heart repolarization and diastolic function, supporting the concept of electrical and mechanical cardiac memory in older adults.

Area of Science:

  • Cardiology
  • Electrophysiology
  • Cardiac Physiology

Background:

  • Cardiac memory, characterized by repolarization alterations after ventricular pacing, is a known phenomenon.
  • Postpacing functional changes have been observed in hypertrophic cardiomyopathy, suggesting a link between electrical and mechanical events.

Purpose of the Study:

  • To investigate the impact of ventricular pacing on postpacing diastolic function.
  • To explore the relationship between these diastolic function changes and repolarization alterations.

Main Methods:

  • Eight elderly subjects (mean age, 76 years) with permanent pacemakers were studied.
  • Electrocardiographic and echocardiographic data were collected during sequential atrial and ventricular pacing protocols.
  • Measurements were taken at various time points before, during, and after 1 hour and 1 week of ventricular pacing.

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Main Results:

  • Repolarization changes consistent with cardiac memory were observed only after 1 week of ventricular pacing.
  • Significant alterations in peak left ventricular filling rate (dD/dt/D) and isovolumic relaxation time (IVRT) accompanied repolarization changes.
  • Correlations were found between Q-T interval changes and IVRT, and between T wave amplitude changes and dD/dt/D.

Conclusions:

  • Ventricular pacing induces persistent changes in both cardiac repolarization and diastolic function.
  • These findings support the concept of electrical and mechanical cardiac memory, where pacing affects both electrical activity and mechanical performance.
  • The observed changes gradually returned towards baseline values 24 hours after pacing cessation.