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ST segment elevation by current-to-load mismatch: an experimental and computational study.

Mark G Hoogendijk1, Mark Potse, Alain Vinet

  • 1Department of Experimental Cardiology, Heart Failure Research Center, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands. m.g.hoogendijk@amc.uva.nl

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Excitation failure in discontinuous heart tissue causes ST segment elevation, a finding modulated by specific ion currents. This research clarifies mechanisms behind Brugada syndrome, offering insights into cardiac electrical activity.

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Area of Science:

  • Cardiovascular Physiology
  • Cardiac Electrophysiology
  • Computational Biology

Background:

  • Ajmaline induces ST segment elevation in SCN5A mutation carriers via excitation failure in discontinuous myocardium.
  • Brugada syndrome ST segment elevation is influenced by cardiac sodium (I(Na)), transient outward (I(to)), and L-type calcium currents (I(CaL)).

Purpose of the Study:

  • To experimentally confirm if current-to-load mismatch-induced excitation failure causes ST segment elevation.
  • To investigate the modulation of this phenomenon by I(to) and I(CaL).

Main Methods:

  • Utilized porcine epicardial shavings with varying isthmus widths to record local activation electrically and optically.
  • Employed computer simulations of cardiac and thoracic electrophysiology to model excitation failure under different ionic conditions and structural discontinuities.
  • Administered ajmaline and manipulated I(Na), I(to), and I(CaL) levels.

Main Results:

  • Ajmaline induced frequency-dependent conduction block in narrow isthmuses (≤1.1 mm), leading to ST segment elevation.
  • Narrower isthmuses (0.9 mm) showed significantly higher rates of total conduction block.
  • Simulations revealed that subepicardial discontinuities cause activation delay, making conduction sensitive to ion currents; reducing I(to) and increasing I(CaL) mitigated excitation failure and ST elevation.

Conclusions:

  • Excitation failure due to current-to-load mismatch is a direct cause of ST segment elevation.
  • This mechanism and its modulation by I(to) and I(CaL) are relevant to understanding ST segment elevation in Brugada syndrome patients.