Figure 3. Data Collection.

A - Recordings of LV endocardial unipolar electrograms recorded via the Ensite 3000 system during steady state (S1) and premature activation (S2). B – Position of catheters on fluoroscopy (A – ablation catheter, D – decapole catheter, R – RV Apex catheter, ICD – ICD lead). C – Local activation and recovery times of the unipolar electrogram (following S2) were measured by the Wyatt method[10].