System and method for ischemia classification with implantable medical device
First Claim
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1. A method comprising:
- obtaining an electrogram representing cardiac data from an implantable medical device for a plurality of cardiac cycles;
determining an ST segment data point for each of the cardiac cycles;
initiating a timer interval when one of the ST segment data point values exceeds a threshold value;
determining a maximum ST segment data point value during the timer interval;
determining an amount of time from initiation of the timer interval until the maximum ST segment data point value occurs; and
determining whether the ST segment data points indicate ischemia based on the amount of time.
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Abstract
An implantable medical device monitors ST segment data collected from EGM. ST trends are established and monitored over time. The IMD is able to discern whether the data indicate supply ischemia, demand ischemia, or other physiological causes. The IMD is then able to provide appropriate information and alerts.
25 Citations
32 Claims
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1. A method comprising:
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obtaining an electrogram representing cardiac data from an implantable medical device for a plurality of cardiac cycles; determining an ST segment data point for each of the cardiac cycles; initiating a timer interval when one of the ST segment data point values exceeds a threshold value; determining a maximum ST segment data point value during the timer interval; determining an amount of time from initiation of the timer interval until the maximum ST segment data point value occurs; and determining whether the ST segment data points indicate ischemia based on the amount of time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus comprising:
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means for obtaining an electrogram representing cardiac data from an implantable medical device for a plurality of cardiac cycles; means for determining an ST segment data point for each of the cardiac cycles; means for initiating a timer interval when one of the ST segment data point values exceeds a threshold value; means for determining a maximum ST segment data point value during the timer interval; means for determining an amount of time from initiation of the timer interval until the maximum ST segment data point value occurs; and means for determining whether the ST segment data points indicate ischemia based on the amount of time. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. An apparatus comprising:
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a sensor input that obtains an electrogram representing cardiac data for a plurality of cardiac cycles; an electrogram analysis module that determines an ST segment data point for each of the cardiac cycles; and an ST analysis module that; initiates a timer interval when one of the ST segment data point values exceeds a threshold value; determines a maximum ST segment data point value during the timer interval; determines an amount of time from initiation of the timer interval until the maximum ST segment data point value occurs; and determines whether the ST segment data points indicate ischemia based on the amount of time. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification