Detection and localization of cardiac fast firing

A system comprising:

• a measurement system configured to acquire cardiac waveform data based on body surface electrical measurements corresponding to a plurality of channels from body surface electrodes adapted to be placed on a patient's body surface;
• a processor configured to:
• perform frequency analysis of the acquired cardiac waveform data for each of the plurality of channels over a moving window;
• identify a proper subset of the channels exhibiting a fast-firing frequency peak within an outlier frequency cluster having a dominant frequency that is higher that a dominant frequency of a baseline frequency cluster corresponding to fibrillatory cardiac activity during a given time window within which the frequency analysis was performed;
• and
• map the proper subset of the channels identified as fast-firing in the given time window to one or more spatial regions of a heart.

A processor-implemented method to detect cardiac fast firing activity of a heart, the method comprising:

• using a processor to perform frequency analysis of cardiac waveform data acquired for each of a plurality of channels over a moving window;
• using the processor to identify a proper subset of the channels exhibiting a fast-firing frequency peak within an outlier frequency cluster having a dominant frequency that is higher in than a dominant frequency of a baseline frequency cluster corresponding to fibrillatory cardiac activity during a given time window within which the frequency analysis was performed;
• using the processor to map the proper subset of the channels identified as fast-firing in the given time window to one or more spatial regions of the heart;
• and
• using the processor to control delivery of a therapy based on an anatomical location of fast-firing activity that corresponds to a respective one of the one or more spatial regions of the heart.