Method and system for evaluating and locating cardiac ischemia
First Claim
1. A method of assessing cardiac ischemia in a subject to provide a measure of cardiac or cardiovascular health in that subject, said method comprising the steps of:
- (a) collecting a first RR-interval data set from said subject during a stage of gradually increasing heart rate;
(b) collecting a second RR-interval data set from said subject during a stage of gradually decreasing heart rate, with said first and second RR-interval data sets being collected while minimizing the influence of rapid transients due to autonomic nervous system and hormonal influence on said data sets;
(c) comparing said first RR-interval data set to said second RR-interval data set to determine the difference between said data sets; and
(d) generating from said comparison of step (c) a measure of cardiac ischemia during stimulation in said subject, wherein a greater difference between said first and second data sets indicates greater cardiac ischemia and lesser cardiac or cardiovascular health in said subject;
wherein said first and second RR-interval data sets are collected from a plurality of separate electrode leads, and wherein said generating step includes the step of generating an indication of the location of cardiac ischemia in said subject.
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Abstract
A method of assessing cardiac ischemia in a subject to provide a measure of cardiac or cardiovascular health in that subject is described herein. The method comprises the steps of: (a) collecting a first RR-interval data set from the subject during a stage of gradually increasing heart rate (e.g., a stage of gradually increasing exercise load); (b) collecting a second RR-interval data set from the subject during a stage of gradually decreasing heart rate (e.g., a stage of gradually decreasing exercise load); (c) comparing the first RR-interval data set to the second RR-interval data set to determine the difference between the data sets; and (d) generating from the comparison of step (c) a measure of cardiac ischemia during exercise in the subject. A greater difference between the first and second data sets indicates greater cardiac ischemia and lesser cardiac or cardiovascular health in the subject. The data sets are collected with a plurality of separate electrodes indicative of different regions of the heart so that the generating step can include locating the region of greatest ischemia by comparing the amount of ischemia indicated in each region.
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Citations
63 Claims
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1. A method of assessing cardiac ischemia in a subject to provide a measure of cardiac or cardiovascular health in that subject, said method comprising the steps of:
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(a) collecting a first RR-interval data set from said subject during a stage of gradually increasing heart rate;
(b) collecting a second RR-interval data set from said subject during a stage of gradually decreasing heart rate, with said first and second RR-interval data sets being collected while minimizing the influence of rapid transients due to autonomic nervous system and hormonal influence on said data sets;
(c) comparing said first RR-interval data set to said second RR-interval data set to determine the difference between said data sets; and
(d) generating from said comparison of step (c) a measure of cardiac ischemia during stimulation in said subject, wherein a greater difference between said first and second data sets indicates greater cardiac ischemia and lesser cardiac or cardiovascular health in said subject;
wherein said first and second RR-interval data sets are collected from a plurality of separate electrode leads, and wherein said generating step includes the step of generating an indication of the location of cardiac ischemia in said subject. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19, 20, 21)
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16. The method according to claim l, wherein said heart rate during said stage of gradually increasing heart rate does not exceed more than 120 beats per minute.
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22. A method of assessing cardiac ischemia in a subject to provide a measure of cardiac or cardiovascular health in that subject, said method comprising the steps of:
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(a) collecting a first RR-interval data set from said subject during a stage of gradually increasing exercise load and gradually increasing heart rate; and
then, without an intervening rest stage,(b) collecting a second RR-interval data set from said subject during a stage of gradually decreasing exercise load and gradually decreasing heart rate;
(c) comparing said first RR-interval data set to said second RR-interval data set to determine the difference between said data sets; and
(d) generating from said comparison of step (c) a measure of cardiac ischemia during exercise in said subject, wherein a greater difference between said first and second data sets indicates greater cardiac ischemia and lesser cardiac or cardiovascular health in said subject;
wherein said first and second RR-interval data sets are collected from a plurality of separate electrode leads, and wherein said generating step includes the step of generating an indication of the location of cardiac ischemia in said subject. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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42. A method of assessing cardiac ischemia in a subject to provide a measure of cardiac or cardiovascular health in that subject, said method comprising the steps, performed on a computer system, of:
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(a) providing a first RR-interval data set collected from said subject during a stage of gradually increasing heart rate;
(b) providing a second RR-interval data set collected from said subject during a stage of gradually decreasing heart rate;
(c) comparing said first RR-interval data set to said second RR-interval data set to determine the difference between said data sets; and
(d) generating from said comparison of step (c) a measure of cardiac ischemia during stimulation in said subject, wherein a greater difference between said first and second data sets indicates greater cardiac ischemia and lesser cardiac or cardiovascular health in said subject;
wherein said first and second RR-interval data sets are collected from a plurality of separate electrode leads, and wherein said generating step includes the step of generating an indication of the location of cardiac ischemia in said subject. - View Dependent Claims (43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53)
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54. A computer system for assessing cardiac ischemia in a subject to provide a measure of cardiac or cardiovascular health in that subject, said system comprising:
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(a) means for providing a first RR-interval data set from said subject during a stage of gradually increasing heart rate;
(b) means for providing a second RR-interval data set from said subject during a stage of gradually decreasing heart rate;
(c) means for comparing said first RR-interval data set to said second RR-interval data set to determine the difference between said data sets; and
(d) means for generating from said comparison of step (c) a measure of cardiac ischemia during stimulation in said subject, wherein a greater difference between said first and second data sets indicates greater cardiac ischemia and lesser cardiac or cardiovascular health in said subject, wherein said generating includes generating an indication of the location of cardiac ischemia in said subject. - View Dependent Claims (55, 56, 57, 58, 60, 61, 62, 63)
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59. A computer program product for assessing cardiac ischemia in a subject to provide a measure of cardiac or cardiovascular health in that subject, said computer program product comprising a computer usable storage medium having computer readable program code means embodied in the medium, the computer readable program code means comprising:
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(a) computer readable program code means for comparing a first RR-interval data set to a second RR-interval data set to determine the difference between said data sets; and
b) computer readable program code means for generating from said comparing of step (a) a measure of cardiac ischemia during stimulation in said subject, wherein a greater difference between said first and second data sets indicates greater cardiac ischemia and lesser cardiac or cardiovascular health in said subject, wherein said generating includes generating an indication of the location of cardiac ischemia in said subject.
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Specification