A system configured to generate an estimate or probability of a patient being free from atrial fibrillation, comprising: at least one computing device comprising at least one non-transitory computer readable medium configured to store instructions executable by at least one processor to determine the source and location of the atrial fibrillation in the patient's heart, the computing device being operably connected to a display or monitor, the computing device being configured to: (a) receive electrogram signals; (b) assign positions of the electrodes on a mapping electrode assembly employed to acquire the electrogram signals to their corresponding electrogram signals; (c) provide or generate a map, representation, or data set of the electrode positions; (d) process the electrogram signals to generate a plurality of electrogram surfaces corresponding at least partially to the map, representation, or data set; (e) process the plurality of electrogram surfaces through time to generate at least one electrographical flow map, representation, pattern, or data set; characterized in that the computing device is further configured to: (f) process the at least one EGF map, representation, pattern, or data set to determine at least two of source activity levels, flow angle variability levels, and active fractionation levels corresponding thereto; (g) determine and generate, on the basis of a combination of the determined at least two of source activity levels, FAV levels, and AFR levels, an electrographical volatility index representative of the estimate or probability of the patient being free from AF, wherein at least one of the EVI and the estimate or probability of the patient being free from AF for presentation on a display, monitor, or printer to a user. at least one computing device comprising at least one non-transitory computer readable medium configured to store instructions executable by at least one processor to determine the source and location of the atrial fibrillation in the patient's heart, the computing device being operably connected to a display or monitor, the computing device being configured to: (a) receive electrogram signals; (b) assign positions of the electrodes on a mapping electrode assembly employed to acquire the electrogram signals to their corresponding electrogram signals; (c) provide or generate a map, representation, or data set of the electrode positions; (d) process the electrogram signals to generate a plurality of electrogram surfaces corresponding at least partially to the map, representation, or data set; (e) process the plurality of electrogram surfaces through time to generate at least one electrographical flow map, representation, pattern, or data set; characterized in that the computing device is further configured to: (f) process the at least one EGF map, representation, pattern, or data set to determine at least two of source activity levels, flow angle variability levels, and active fractionation levels corresponding thereto; (g) determine and generate, on the basis of a combination of the determined at least two of source activity levels, FAV levels, and AFR levels, an electrographical volatility index representative of the estimate or probability of the patient being free from AF, wherein at least one of the EVI and the estimate or probability of the patient being free from AF for presentation on a display, monitor, or printer to a user.