System and methods for analyzing QRS curvature to detect cardiac events
First Claim
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1. A device for assessing the condition of a mammalian heart, comprising:
- a lead comprising two sensors,a processor coupled to the lead, the processor configured to;
(i) obtain a signal from the lead, and compute a waveform corresponding to the signal, the waveform being characterized by a QRS complex;
(ii) compute the value of a curvature function at a first point within the QRS complex, wherein the curvature function has a one to one time series correspondence with the waveform, thereby computing a first curvature value;
(iii) apply a test to detect a pathological heart condition, wherein the test is based on the first curvature value.
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Abstract
Disclosed is a system for detecting pathophysiological cardiac conditions. The system comprises a diagnostic device that contains electronic circuitry that can detect a cardiac event such as an acute ischemia. The cardiac diagnostic device receives electrical signals from subcutaneous or body surface sensors. The cardiac diagnostic device includes a processor that computes a measure of QRS curvature and applies an ischemia test based on the measure of QRS curvature to determine a likelihood of ischemia.
18 Citations
21 Claims
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1. A device for assessing the condition of a mammalian heart, comprising:
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a lead comprising two sensors, a processor coupled to the lead, the processor configured to; (i) obtain a signal from the lead, and compute a waveform corresponding to the signal, the waveform being characterized by a QRS complex; (ii) compute the value of a curvature function at a first point within the QRS complex, wherein the curvature function has a one to one time series correspondence with the waveform, thereby computing a first curvature value; (iii) apply a test to detect a pathological heart condition, wherein the test is based on the first curvature value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A device for assessing the condition of a mammalian heart, comprising:
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a lead comprising two sensors, a processor coupled to the lead, the processor configured to; (i) obtain a signal from the lead, and compute a waveform corresponding to the signal, the waveform being characterized by a QRS complex; (ii) apply a non-recursive method to compute the value of a curvature function at a first point within the QRS complex, thereby computing a first curvature value; (iii) apply a test to detect a pathological heart condition, wherein the test is based on the first curvature value. - View Dependent Claims (11)
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12. A device for assessing the condition of a mammalian heart, comprising:
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a lead comprising two sensors, a processor coupled to the lead, the processor configured to; (i) obtain a signal from the lead, and compute a waveform corresponding to the signal, the waveform being characterized by a QRS complex; (ii) compute the value of a first curvature function at a first portion within the QRS complex and to compute the value of a second curvature function at a second portion within the QRS complex, thereby computing first and second curvature values; (iii) apply a test to detect a pathological heart condition, wherein the test is based on the first and second curvature values. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A device for assessing the condition of a mammalian heart, comprising:
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a lead comprising two sensors, a processor coupled to the lead, the processor configured to; (i) obtain a signal from the lead, and compute a waveform corresponding to the signal, the waveform being characterized by a plurality of QRS complexes; (ii) compute the values of a curvature function at a plurality of portions of the QRS complexes, thereby deriving a plurality of curvature values, wherein each one of the plurality of QRS complexes corresponds to at least one of the plurality of curvature values; (iii) apply a test to detect a pathological heart condition, wherein the test is based on plurality of curvature values. - View Dependent Claims (20, 21)
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Specification