Abstract: A method and system for assessing the regularity of heart function, to be utilized with electrocardiographic (hereinafter "EKG") waveform representations of heart function. The method and system work by first monitoring and recording a particular patient's EKG waveform data for a defined period of time. As the EKG waveform data is being monitored and recorded, a set of EKG waveforms is created from the monitored and recorded data. The set is made up of waveforms deemed to be dissimilar. After the defined period of time has elapsed, the total number of dissimilar waveforms in the set are counted, and the total count of the dissimilar waveforms in the set is divided by total number of waveforms that were contained within the EKG data recorded and monitored during the defined period of time.