Spatiotemporal AP triangulation, excitability, and activation pattern for HIFU ablation.

<p>(A) Ratio of APD₅₀ and APD₈₀ before and after HIFU ablation, and ΔAPD₅₀/APD₈₀. (B) Upstroke rising rate (dΔF/dt)_max before and after HIFU, and their difference. (C) Activation time before and after HIFU, and their difference. (D) Conduction velocities (CVs) before and after HIFU ablation in the white boxed ROI in the activation maps in (C). Directions of electrical wave propagation and magnitude of CVs are indicated by the directions of the red arrows and their lengths. Same lesion area as in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0082689#pone-0082689-g004" target="_blank">Figure 4</a> is indicated by black dash lines.