Active implantable medical device for detecting a remodeling or reverse remodeling phenomenon of the patient
First Claim
1. An implantable medical device comprising:
- a processor configured to;
detect at least one of a ventricular depolarization signal or an atrial depolarization signal of a heart on a channel at a plurality of distinct instants;
collect two endocardial electrogram (EGM) signals during a spontaneous rhythm cardiac cycle, wherein the EGM signals are collected on a plurality of separate channels, wherein the EGM signals include a unipolar far-field EGM signal and a near-field EGM signal;
derive a temporal component from each of the EGM signals;
combine the two temporal components into a parametric 2D characteristic representative of the cardiac cycle based on the variations of one of the temporal components as a function of the other temporal component;
analyze the 2D characteristic by deriving, from the 2D characteristic or from an average of a plurality of the 2D characteristics collected over successive cardiac cycles, an intrinsic descriptor parameter representative of the 2D characteristic;
perform a historical analysis by evaluating a variation over time of the intrinsic descriptor parameter of the 2D characteristic with respect to a previous reference 2D characteristic stored by the device;
compare the variation to a predetermined threshold; and
trigger an alert in response to determining the variation exceeds the predetermined threshold.
1 Assignment
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Accused Products
Abstract
According to some embodiments, a device operates by comparative morphological analysis of depolarization signals collected in spontaneous rhythm on separate respective channels, with two temporal components combined into a single 2D parametric VGM vectogram characteristic. Similarity quantification methods evaluate a variation over time of a descriptor parameter of a current VGM compared to a stored previous reference VGM. This variation is compared with predetermined thresholds to diagnose an occurrence of remodeling or reverse remodeling in a patient, and/or to detect a lead failure or an occurrence of ischemia. The descriptor parameter is a function of a velocity vector of the VGM, a comparison relating to a correlation coefficient between respective magnitudes of a current VGM velocity vector and of a reference VGM velocity vector, and an average angle between these respective velocity vectors.
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Citations
20 Claims
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1. An implantable medical device comprising:
a processor configured to; detect at least one of a ventricular depolarization signal or an atrial depolarization signal of a heart on a channel at a plurality of distinct instants; collect two endocardial electrogram (EGM) signals during a spontaneous rhythm cardiac cycle, wherein the EGM signals are collected on a plurality of separate channels, wherein the EGM signals include a unipolar far-field EGM signal and a near-field EGM signal; derive a temporal component from each of the EGM signals; combine the two temporal components into a parametric 2D characteristic representative of the cardiac cycle based on the variations of one of the temporal components as a function of the other temporal component; analyze the 2D characteristic by deriving, from the 2D characteristic or from an average of a plurality of the 2D characteristics collected over successive cardiac cycles, an intrinsic descriptor parameter representative of the 2D characteristic; perform a historical analysis by evaluating a variation over time of the intrinsic descriptor parameter of the 2D characteristic with respect to a previous reference 2D characteristic stored by the device; compare the variation to a predetermined threshold; and trigger an alert in response to determining the variation exceeds the predetermined threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method comprising:
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detecting, by an implantable medical device, at least one of a ventricular depolarization signal or an atrial depolarization signal of a heart on a channel at a plurality of times; collecting two EGM signals during a spontaneous rhythm cardiac cycle, wherein the EGM signals are collected on a plurality of separate channels, wherein the EGM signals include a unipolar EGM far-field signal and a near-field EGM signal; deriving a temporal component from each of the EGM signals; combining the two temporal components into a parametric 2D characteristic representative of the cardiac cycle based on the variations of one of the temporal components as a function of the other temporal component; analyzing the 2D characteristic by deriving, from the 2D characteristic or from an average of a plurality of the 2D characteristics collected over successive cardiac cycles, an intrinsic descriptor parameter representative of the 2D characteristic; performing a historical analysis by evaluating a variation over time of the intrinsic descriptor parameter of the 2D characteristic with respect to a previous reference 2D characteristic stored by the device; comparing the variation to a predetermined threshold; and triggering an alert in response to determining the variation exceeds the predetermined threshold. - View Dependent Claims (19, 20)
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Specification