REJECTION OF NOISES CAUSED BY POSTURAL CHANGES DURING ACUTE MYOCARDIAL INFARCTION DETECTION
First Claim
1. A system comprising:
- a processor including;
a cardiac signal vector module configured to measure, from an electrical cardiac signal, a first dominant vector corresponding to a direction and magnitude of maximum signal power of a first segment of at least one cardiac cycle of a subject and at least a second dominant vector corresponding to a direction and magnitude of maximum signal power of a second segment of the cardiac cycle; and
an ischemia detection module configured to measure a change in the first dominant vector, to form a difference by subtracting a measured change in the second dominant vector from the measured change in the first dominant vector, and to declare whether an ischemic event occurred using the difference.
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Abstract
A system comprising a processor that includes a cardiac signal vector module and an ischemia detection module. The cardiac signal vector module is configured to measure a first dominant vector corresponding to a direction and magnitude of maximum signal power of a first segment of at least one cardiac cycle of a subject and at least a second dominant vector corresponding to a direction and magnitude of maximum signal power of a second segment of the cardiac cycle from an electrical cardiac signal. The ischemia detection module is configured to measure a change in the first dominant vector, to form a difference by subtracting a measured change in the second dominant vector from a measured change in the first dominant vector, and to declare whether an ischemic event occurred using the difference.
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Citations
35 Claims
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1. A system comprising:
a processor including;
a cardiac signal vector module configured to measure, from an electrical cardiac signal, a first dominant vector corresponding to a direction and magnitude of maximum signal power of a first segment of at least one cardiac cycle of a subject and at least a second dominant vector corresponding to a direction and magnitude of maximum signal power of a second segment of the cardiac cycle; and
an ischemia detection module configured to measure a change in the first dominant vector, to form a difference by subtracting a measured change in the second dominant vector from the measured change in the first dominant vector, and to declare whether an ischemic event occurred using the difference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method comprising:
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sensing at least one cardiac signal representative of cardiac activity of a subject using an implantable medical device (IMD);
calculating, from the cardiac signal, a first dominant vector corresponding to a direction and magnitude of maximum signal power of a first segment of a cardiac cycle and a second dominant vector corresponding to a direction and magnitude of maximum signal power of a second segment of a cardiac cycle;
measuring a change in the first dominant vector;
measuring a change in the second dominant vector; and
subtracting the change in the second dominant vector from the measured change in the first dominant vector to form a difference. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A system comprising
an implantable medical device (IMD) comprising: -
a plurality of implantable electrodes adapted for spatial distribution within a subject; and
at least one cardiac signal sensing circuit in communication with the electrodes, the cardiac signal sensing circuit operable to produce an electrical cardiac signal representative of cardiac activity of the subject; and
means for calculating, from the electrical cardiac signal, a first dominant vector corresponding to a direction and magnitude of maximum signal power of a first segment of at least one cardiac cycle of the subject and at least a second dominant vector corresponding to a direction and magnitude of maximum signal power of a second segment of the cardiac cycle, and forming a difference by subtracting a measured change in the second dominant vector from a measured change in the first dominant vector, and using the difference to reduce noise in the measured change in the first dominant vector. - View Dependent Claims (33, 34, 35)
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Specification