Patent ID: 8024028

Claim:
A system for tracking the cardiovascular condition of a human patient the system including: at least two electrodes positioned to sense the electrical signal from the patient's heart, the electrical signal consisting of a multiplicity of beats; a histogram memory including memory capacity to store at least one histogram, the at least one histogram including at least two bins, each bin being a counter; and a processor to compute the amplitude of the ST segment of the electrical signal for at least a portion of the multiplicity of beats, each beat of the portion of the multiplicity of beats that is processed being a processed beat, the processor also being designed to compute the R-R interval for each processed beat, the processor further being designed to increment one of the at least two bins of the at least one histogram where the choice of bin to be incremented is dependent on the computed amplitude of the ST segment for one or more processed beats, a histogram only being incremented when a computed R-R interval associated with the one or more of the processed beats is within a particular heart rate range, any histogram stored in the histogram memory being incremented by the processor only for a data collection time period.