Ischemia detection
First Claim
1. A method for detecting myocardial ischemia, the method comprising by:
- obtaining a first signal indicative of dynamic mechanical activity of a heart;
obtaining a second signal indicative of electrical activity of the heart;
detecting a myocardial isehemia condition based on both the first signal and the second signal;
storing a peak endocardial acceleration value in a computer memory location;
after a predetermined time interval, obtaining at least one new peak endocardial acceleration value;
storing the at least one new peak endocardial acceleration signal; and
comparing the peak endocardial acceleration to the at least one new peak endocardial acceleration value;
wherein obtaining the first signal includes obtaining a heart acceleration signal from an accelerometer deployed within the heart and wherein said heart acceleration signal is a peak endocardial acceleration value.
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Abstract
Techniques for detection and treatment of myocardial ischemia are described that monitor both the electrical and dynamic mechanical activity of the heart to detect and verify the occurrence of myocardial ischemia in a more reliable manner. The occurrence of myocardial ischemia can be detected by monitoring changes in an electrical signal such as an ECG or EGM, and changes in dynamic mechanical activity of the heart that are sensed by an accelerometer sensor. The heart acceleration signal can be obtained from an single- or multiple-axis accelerometer and/or a pressure sensor deployed within or near the heart. The techniques correlate contractility changes detected by an accelerometer or pressure sensor with changes in the ST electrogram segment detected by the electrodes to increase the reliability of ischemia detection.
95 Citations
14 Claims
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1. A method for detecting myocardial ischemia, the method comprising by:
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obtaining a first signal indicative of dynamic mechanical activity of a heart; obtaining a second signal indicative of electrical activity of the heart; detecting a myocardial isehemia condition based on both the first signal and the second signal; storing a peak endocardial acceleration value in a computer memory location; after a predetermined time interval, obtaining at least one new peak endocardial acceleration value; storing the at least one new peak endocardial acceleration signal; and comparing the peak endocardial acceleration to the at least one new peak endocardial acceleration value; wherein obtaining the first signal includes obtaining a heart acceleration signal from an accelerometer deployed within the heart and wherein said heart acceleration signal is a peak endocardial acceleration value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A computer readable medium for storing computer executable instructions for performing a method for detecting myocardial ischemia, comprising:
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executable instructions for obtaining a first signal indicative of dynamic mechanical activity of a heart from an accelerometer sensor; executable instructions for obtaining a second signal indicative of electrical activity of the heart; executable instructions for detecting a myocardial ischemia condition based on both the first signal and the second signal; executable instructions for storing the peak endocardial acceleration value in a computer memory location; executable instructions for, after a predetermined time interval, obtaining at least one new peak endocardial acceleration value; executable instructions for storing the at least one new peak endocardial acceleration signal; and executable instructions for comparing the peak endocardial acceleration to the at least one new peak endocardial acceleration value wherein the executable instructions for obtaining the first signal further comprises a instructions for obtaining a heart acceleration signal from the accelerometer sensor wherein said accelerometer sensor is deployed within a chamber of the heart and wherein said heart acceleration signal is a peak endocardial acceleration value having a value over a dynamic range of about 5 Hz to about 100 Hz. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification