Spatiotemporal approximation of cardiac activation and recovery isochrones

•Cardiac electrograms are routinely used to study activation and recovery sequence.•They may contain noise, making it difficult to determine the deflection time.•The processes are spatially coupled and result in a temporal and spatial deflection.•Such a spatiotemporal activation and recovery time computation is more accurate.•This benefits invasive catheter procedures and noninvasive electrocardiographic imaging.