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Source-Sink Mismatch Causing Functional Conduction Block in Re-Entrant Ventricular Tachycardia.

Edward J Ciaccio1, James Coromilas2, Andrew L Wit3

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This review models electrical wavefronts in ventricular tachycardia (VT) to guide catheter ablation. Understanding source-sink mismatch in myocardial tissue helps predict and treat re-entrant circuits.

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MRIactivationre-entryventricular tachycardiawavefront

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Area of Science:

  • Cardiology
  • Biophysics
  • Medical Modeling

Background:

  • Ventricular tachycardia (VT) from re-entrant circuits is a dangerous arrhythmia often difficult to treat.
  • Accurate models of re-entry are needed to guide catheter ablation for effective circuit interruption.

Purpose of the Study:

  • To review models of electrical activation wavefront propagation during re-entrant VT.
  • To detail the relationship between activation mapping and infarct border zone thickness transitions causing source-sink mismatch.

Main Methods:

  • Discussion of electrical activation wavefront propagation models.
  • Analysis of source-sink mismatch in infarct border zones.
  • Modeling re-entry isthmuses based on boundary properties and thickness transitions.

Main Results:

  • Source-sink mismatch, driven by infarct border zone thickness changes, dictates functional block formation during VT.
  • Segments with high thickness transition and source-sink mismatch create functional block.
  • Segments with lesser thickness change act as entrance/exit points to the re-entry isthmus.

Conclusions:

  • The source-sink mismatch model effectively describes re-entry isthmus properties.
  • This model is applicable to post-infarction substrates and other myocardial changes like fibrosis or fiber dissociation.
  • Improved modeling can enhance catheter ablation strategies for life-threatening VT.