Fig. 1.

Diagram showing the location of commonly used activation times in the literature for the action potential (AP), extracellular unipolar (UNI) and bipolar (BI) electrograms. (A) Maximum $\mathrm{d}V/\mathrm{d}t$, (B) maximum negative $\mathrm{d}V/\mathrm{d}t$, (C) maximum absolute voltage $\left|V\right|$, (D) maximum absolute slope $|\mathrm{d}V/\mathrm{d}t|$ and (E) minimum voltage.