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Related Experiment Videos

Electrogram patterns predicting successful catheter ablation of ventricular tachycardia.

D M Fitzgerald1, K J Friday, J A Wah

  • 1Department of Medicine, University of Oklahoma Health Sciences Center, OK 73190.

Circulation
|April 1, 1988
PubMed
Summary

Catheter ablation for ventricular tachycardia in myocardial infarction patients is more effective when targeting mid-diastolic potentials. These potentials, associated with the reentrant circuit, led to successful ablation in all cases, unlike early activation sites.

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Catheter ablation of macroreentrant atrial tachycardia in patients following atriotomy.

European heart journal·2002

Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Devices

Background:

  • Ventricular tachycardia (VT) in patients with prior myocardial infarction (MI) is often caused by reentry.
  • Current catheter ablation strategies aim to disrupt reentrant circuits but require improved targeting.

Purpose of the Study:

  • To identify specific electrogram characteristics that identify critical components of the reentrant circuit for VT ablation.
  • To compare the efficacy of catheter ablation targeting early ventricular activation sites versus sites with isolated mid-diastolic potentials.

Main Methods:

  • Ablation attempts were made on 14 monomorphic VTs in 10 patients with remote MI.
  • Shocks were delivered at either early activation sites or sites with isolated mid-diastolic potentials.
  • Efficacy was assessed by successful ablation of VT.

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Main Results:

  • Targeting isolated mid-diastolic potentials resulted in successful ablation of all seven VTs (one required a second attempt).
  • Targeting early activation sites in seven VTs was successful in only three (25%) attempts.
  • No significant difference in shock number or energy was observed between successful and unsuccessful ablation attempts.

Conclusions:

  • Isolated mid-diastolic potentials are reliable electrogram markers for targeting reentrant circuits in VT post-MI.
  • Catheter ablation guided by mid-diastolic potentials significantly improves success rates for VT in myocardial infarction patients.