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US 7,254,440 B1Granted
Implantable ischemia and myocardial infarction monitor and method
AssigneePacesetter, Inc.
InventorMark W. Kroll
Life of this patent
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Abstract
An implantable ischemia detecting devices generates a plurality of electrograms for analysis. A processor integrates the ST segment and T wave of each electrogram and normalizes the resulting integral by a normalizing factor to provide a ST segment score and T wave score, respectively. The ST segment and T wave scores are then utilized to compute a total ST segment and T wave score for analysis in detecting or monitoring ischemia of a patient's heart.
Claims17
In a cardiac monitoring device, a method of detecting ischemia of a heart comprising:
- sensing cardiac activity of the heart to provide an electrogram of the cardiac activity;
- integrating a selected feature of the electrogram to provide an integral;
- normalizing the integral by a normalizing factor to provide an electrogram feature score;
- and
- providing an ischemia indication when the electrogram feature score satisfies a given criteria, wherein sensing comprises providing a plurality of electrograms, and wherein the method further comprises providing a like plurality of electrogram feature scores and combining the electrogram feature scores to provide a combined electrogram feature score, and wherein providing comprises analyzing the combined electrogram feature score.
2 more elements
An ischemia detecting device comprising:
- at least two electrodes that sense cardiac activity of a heart;
- a sensing circuit coupled to the at least two electrodes that provides an electrogram of the sensed cardiac activity;
- a processor comprising an integrator that provides an integral of a selected feature of the electrogram and a normalizer that normalizes the integral by a normalizing factor to provide an electrogram feature score;
- and
- an analyzer that provides an ischemia indication when the electrogram feature score satisfies a given criteria,
- wherein the at least two electrodes provide a plurality of cardiac activity sensing electrode configurations resulting in a plurality of electrograms and electrogram feature scores, wherein the processor further comprises a combiner that provides a combined electrogram feature score, and wherein the analyzer analyzes the combined electrogram feature score.
3 more elements
An ischemia detecting device comprising:
- sensing means for sensing cardiac activity from a plurality of electrodes to provide a plurality of electrograms of the sensed cardiac activity;
- integrating means for integrating a selected feature of the plurality of electrograms to provide a plurality of integrals;
- normalizing means for normalizing the plurality of integrals by a normalizing factor to provide a plurality of electrogram feature scores;
- a combiner that provides a combined electrogram feature score;
- and
- detecting means for detecting ischemia when the combined electrogram feature score satisfies a given criteria.
3 more elements
Dependencies are inferred from the claim text.