Patent ID: 8781566

Claim:
An implantable device for tracking the cardiovascular condition of a human patient, the device including: an electrode adapted for placement inside a human patient to sense the electrical signal from the patient's heart, the electrical signal being an electrogram which consists of a multiplicity of beats; a digital processor configured to: acquire the electrogram and compute from the electrogram a plurality of values of a heart signal feature; compute both first and second aspects pertaining to the plurality of values of the heart signal feature within the acquired electrogram, wherein the first and second aspects are at least partially independent of one another and are defined as a magnitude of the heart signal feature and time duration over which said heart signal feature is computed, respectively; and detect a cardiovascular condition by applying a test to the plurality of values of the heart signal feature within the acquired electrogram, wherein the test is at least partially based on a sliding scale such that the first and second aspects of the plurality of values vary in accordance with one another.