Implantable devices, and methods for use therewith, for performing cardiac and autonomic assessments using phase rectified signal averaging
First Claim
1. For use with an implantable device, a method of performing at least one of a cardiac assessment and an autonomic assessment, comprising:
- (a) sensing a cardiac electrogram (EGM) signal using implanted electrodes;
(b) measuring cardiac intervals within a portion of the sensed EGM signal;
(c) identifying anchor points based on the measured cardiac intervals;
(d) defining, for each identified anchor point, a segment of at least three consecutive said cardiac intervals that is generally centered about the anchor point;
(e) averaging the segments defined for the anchor points to produce an average segment; and
(f) performing at least one of a cardiac assessment and an autonomic assessment, based on the average segment.
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Accused Products
Abstract
Provided herein are implantable devices, and methods for use therewith, that perform at least one of a cardiac assessment and an autonomic assessment. An implantable device is used to sense a cardiac electrogram (EGM) signal, and cardiac intervals are measured within a portion of the sensed EGM signal. Anchor points are identified based on the measured cardiac intervals, and for each identified anchor point, a segment of at least three consecutive said cardiac intervals that is generally centered about the anchor point is defined. The segments defined for the anchor points are averaged to produce an average segment. At least one of a cardiac assessment and an autonomic assessment is performed based on the average segment. This can include assessing a patient'"'"'s autonomic tone based on the average segment, assessing a patients risk of SCD based on the average segment and/or detecting a myocardial ischemic event based on the average segment. This abstract is not intended to describe all of the various embodiments of the present invention.
25 Citations
31 Claims
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1. For use with an implantable device, a method of performing at least one of a cardiac assessment and an autonomic assessment, comprising:
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(a) sensing a cardiac electrogram (EGM) signal using implanted electrodes; (b) measuring cardiac intervals within a portion of the sensed EGM signal; (c) identifying anchor points based on the measured cardiac intervals; (d) defining, for each identified anchor point, a segment of at least three consecutive said cardiac intervals that is generally centered about the anchor point; (e) averaging the segments defined for the anchor points to produce an average segment; and (f) performing at least one of a cardiac assessment and an autonomic assessment, based on the average segment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. An implantable device for assessing autonomic tone, comprising:
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implantable electrodes for sensing a cardiac electrogram (EGM) signal; means for measuring cardiac intervals within a portion of the sensed EGM signal; means for identifying anchor points based on the measured cardiac intervals; means for defining, for each identified anchor point, a segment of at least three consecutive said cardiac intervals that is generally centered about the anchor point; means for averaging the segments defined for the anchor points to produce an average segment; and means for assessing autonomic tone based on the average segment.
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30. An implantable device for assessing a risk of sudden cardiac death (SCD), comprising:
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implantable electrodes for sensing a cardiac electrogram (EGM) signal; means for measuring cardiac intervals within a portion of the sensed EGM signal; means for identifying anchor points based on the measured cardiac intervals; means for defining, for each identified anchor point, a segment of at least three consecutive said cardiac intervals that is generally centered about the anchor point; means for averaging the segments defined for the anchor points to produce an average segment; and means for assessing risk of SCD based on the average segment.
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31. An implantable device for detecting myocardial ischemic events, comprising:
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implantable electrodes for sensing a cardiac electrogram (EGM) signal; means for measuring cardiac intervals within a portion of the sensed EGM signal; means for identifying anchor points based on the measured cardiac intervals; means for defining, for each identified anchor point, a segment of at least three consecutive said cardiac intervals that is generally centered about the anchor point; means for averaging the segments defined for the anchor points to produce an average segment; and means for detecting a myocardial ischemic event based on the average segment.
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Specification