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Related Experiment Videos

Mechanoelectric feedback after left ventricular infarction in rats.

I Kiseleva1, A Kamkin, K D Wagner

  • 1Institute of Physiology, Humboldt-University (Charité), Berlin, Germany.

Cardiovascular Research
|March 23, 2000
PubMed
Summary

Myocardial infarction (MI) increases cardiac myocyte sensitivity to mechanical stretch, causing abnormal electrical activity. This mechanoelectric feedback in the borderzone may explain post-infarction arrhythmias.

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Area of Science:

  • Cardiovascular Physiology
  • Cardiac Electrophysiology
  • Mechanoelectric Feedback

Background:

  • Myocardial infarction (MI) can cause electrical abnormalities and rhythm disturbances.
  • Limited data exists on the electrophysiological basis of post-MI arrhythmias.
  • Regional contraction abnormalities are prominent after MI.

Purpose of the Study:

  • Investigate if myocardial stretch at the infarction borderzone modulates cardiomyocyte electrophysiology.
  • Determine if mechanoelectric feedback contributes to post-MI arrhythmia.
  • Examine stretch-activated depolarizations (SADs) in infarcted hearts.

Main Methods:

  • Experimental myocardial infarction (MI) induced in rats.
  • Action potentials (AP) measured in left ventricular borderzone preparations.

Related Experiment Videos

  • Sustained stretch applied via micrometer; SADs recorded.

    • Main Results:

    • MI preparations showed spontaneous electrical and contractile activity.
    • MI cardiomyocytes exhibited prolonged AP duration and more negative resting potential.
    • Lower stretch levels elicited SADs in MI compared to sham operations (SO).

    Conclusions:

    • Spontaneous SADs occur at lower stretch degrees in the MI borderzone.
    • Increased cardiac myocyte sensitivity to mechanical stimuli may drive post-MI arrhythmia.
    • Stretch-activated channels likely mediate these observed SADs.