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Related Experiment Videos

Evolution and resolution of long-term cardiac memory

A Shvilkin1, P Danilo, J Wang

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

Circulation
|May 29, 1998
PubMed
Summary
This summary is machine-generated.

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Cardiac memory (CM) is a dynamic T-wave change from abnormal heart activation. Long-term CM alters repolarization gradients and requires new protein synthesis, with recovery time increasing with pacing duration.

Area of Science:

  • Electrophysiology
  • Cardiac Physiology

Background:

  • Cardiac memory (CM) describes T-wave alterations following abnormal ventricular activation.
  • These changes accumulate with repeated episodes of abnormal activation.

Purpose of the Study:

  • To investigate the kinetics of long-term cardiac memory.
  • To explore the association between cardiac memory and ventricular action potential.

Main Methods:

  • Ventricular pacing in dogs (110-120 bpm) for ~3 weeks.
  • Assessment of T-wave vector rotation, cardiac hemodynamics, myocardial flow, and action potentials.
  • Administration of protein synthesis inhibitor (cycloheximide).

Main Results:

  • Cardiac memory evolved in all dogs, showing T-wave vector rotation towards the paced QRS vector.

Related Experiment Videos

  • Recovery time for T-waves increased with pacing duration; cycloheximide attenuated CM.
  • CM was linked to increased action potential duration in epicardial/endocardial cells, altering repolarization gradients.

    • Conclusions:

    • Cardiac memory is a dynamic process influenced by the paced QRS vector.
    • Altered action potential duration in epicardial and endocardial cells modifies the transmural repolarization gradient.
    • CM requires altered activation pathways and new protein synthesis, without affecting hemodynamics or flow.