Ablation Targets of Scar-related Ventricular Tachycardia Identified by Dynamic Functional Substrate Mapping

Ablation Targets of Scar-related Ventricular Tachycardia Identified by Dynamic Functional Substrate Mapping

This study aims at comparing the recurrence rates of ventricular tachycardia ablated after being mapped by 2 different techniques.

The study participants are patients presented with recurrent ventricular tachycardia.

They will be divided into 2 groups in terms of mapping. The first group will use mapping during sinus rhythm to identify late potentials that may be incriminated in the tachycardia circuit.

The other group will undergo mapping during right ventricular extrastimulus pacing to unmask hidden potentials. The identified potentials will be ablated in both groups.

Inclusion Criteria:

• • Patients with structural heart disease; previous myocardial infarction, left ventricular dilatation/systolic dysfunction, or normal left ventricular diameters/ systolic function with evidence of ventricular scar on contrast enhanced-cardiac magnetic resonance or electroanatomic map.

  • Sustained monomorphic ventricular tachycardia documented by 12-lead ECG or implantable cardioverter defibrillator (electrograms resistant to antiarrhythmic drug treatment or requiring implantable cardioverter defibrillator therapies.

Exclusion Criteria:

• • Patients with ventricular arrhythmias attributed to reversible causes.