Patent ID: 8244338

Claim:
A device for tracking the cardiovascular condition of a human patient the system including: at least two implanted electrodes that are positioned within the human patient to sense the electrical signal from the patient's heart, the electrical signal consisting of a multiplicity of beats; a memory; a processor configured to (a1) compute from the electrical signal a heart signal parameter value associated with each of the multiplicity of beats, (a2) compute a heart rate value associated with each of the multiplicity of beats, (a3) for each of the multiplicity of beats, select one of a plurality of histograms to update according to the associated heart rate wherein each histogram includes a plurality of histogram bins, (a4) for each of the multiplicity of beats, increment one of the plurality of histogram bins within the selected histogram corresponding to the beat, wherein the selection of the histogram bin to be incremented is dependent on the computed value of the heart signal parameter, (a5) compute from the plurality of histogram bins a heart parameter's average value over a time period for each of a multiplicity of heart rate ranges, thereby generating a multiplicity of average values; (b) store the multiplicity of average values in the memory according to both time period and heart rate; and, (c) repeat (a1)-(a5), and (b) for a multiplicity of time periods, thereby generating, for each heart rate range, a time series of average values of the parameter.