Noncentrifugal activation patterns in focal RVOT PVC/VT: New insights from high density multielectrode mapping.

Background: Activation from an automatic focus is thought to show centrifugal spread. In patients with premature ventricular complex/ventricular tachycardia (PVC/VT) from the right ventricular outflow tract (RVOT), the presence of preferential conduction and epicardial connections could however also lead to noncentrifugal wavefront propagation.

Objective: To study endocardial activation in RVOT PVC/VT using high-resolution 3D activation mapping.