System and methods for sliding-scale cardiac event detection
First Claim
1. 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.
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Abstract
A system for the detection of cardiac events occurring in a human patient is disclosed to include at least two electrodes for obtaining an electrical signal from a patient'"'"'s heart. At least two electrodes are included in the system for obtaining an electrical signal from a patient'"'"'s heart. An electrical signal processor is electrically coupled to the electrodes for processing the electrical signal. The system determines the presence of a cardiovascular condition by applying a sliding scale rule to heart signal feature values. When the cardiovascular condition is ischemia, the ST segment may be analyzed. A sliding scale is applied to ST segment shifts such that when the magnitudes of ST segment shifts are relatively small, a larger number of beats is required to detect ischemia compared to the case when the magnitudes of ST shifts are large.
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Citations
13 Claims
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1. An implantable device for tracking the cardiovascular condition of a human patient, the device including:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. 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 an 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 to compute from the electrogram both a first plurality of values of a first heart signal feature and a second plurality of values of a second heart signal feature; apply a test to the first plurality of values and the second plurality of values within the acquired electrogram, wherein the test is at least partially based on a sliding scale such that the first plurality of values and the second plurality of values vary in accordance with one another. - View Dependent Claims (10, 11, 12, 13)
Specification