Movie S1.

Ventricular epicardial optical mapping reveals complex patterns of AP wave propagation during spontaneous VF in RyR2-A4860G+/− heart under adrenergic stress and high extracellular Ca2+. Phase map movie shows 4 s of real-time activity (3,200 total frames acquired at 800 frames per second with a 30-ms delay set between each frame) during VF.