Ventricular tachycardia in ischemic heart disease substrates

Area of Science:

• Cardiology
• Electrophysiology
• Medical Devices

Background:

• Myocardial infarction (MI) survivors face risks of ventricular tachycardia due to post-infarct remodeling.
• Electrophysiologic substrates for monomorphic ventricular tachycardia (MMVT) develop after ischemic cardiac injury.
• Improved understanding of MMVT circuits aids device and catheter-based therapy development.

Purpose of the Study:

• To review the role of ischemic heart disease substrate in MMVT development.
• To discuss electrophysiologic characterization of post-infarct myocardium and scar border zones.
• To examine catheter ablation strategies and epicardial mapping for recurrent MMVT.

Main Methods:

• Review of clinical and investigative tools for characterizing the post-infarct substrate.
• Analysis of bipolar electrogram amplitudes for scar delineation.
• Discussion of functional electrogram determinants, including isolated late potentials.
• Examination of catheter ablation targets (structural and functional) and epicardial mapping.

Main Results:

• Post-infarct remodeling creates electrophysiologic substrates for MMVT.
• Bipolar electrogram amplitudes help delineate scar border zones.
• Isolated late potentials are functional determinants of reentrant circuits.
• Catheter ablation and epicardial mapping are key therapeutic strategies.

Conclusions:

• The ischemic substrate is central to MMVT development after myocardial infarction.
• Electrophysiologic mapping techniques are crucial for understanding and targeting MMVT circuits.
• Catheter ablation, including epicardial approaches, offers effective management for recurrent MMVT.