Implantable medical device and method for classifying arrhythmia events
First Claim
1. An implantable medical device to discriminate between ventricular tachycardias (VTs) and supraventricular tachycardias (SVTs), said implantable medical device being configured to be connected to at least one medical lead adapted to be placed at or within a heart of a patient, said medical lead including at least one electrode adapted to sense electrical activity of said heart and to produce at least one signal representative of said electrical activity, said implantable medical device comprising:
- an intra-cardiac electrogram (IEGM) analyzing circuit that receives said signal representative of said electrical activity and to analyse IEGMs of said heart to detect an arrhythmia event;
a sensing circuit that senses a respiratory pattern of said patient and to produce at least one signal representative of said respiratory pattern;
a respiratory parameter determining circuit that determines at least one respiratory parameter reflecting characteristics of the respiratory pattern of said patient based on said sensed respiratory pattern and that determines a respiratory measure corresponding to a change of a rate of change of said at least one respiratory parameter; and
an arrhythmia classifying circuit that classifies the detected arrhythmia event as a VT or SVT based on said respiratory measure, including classifying arrhythmia events that satisfy at least a first criterion for VT as an arrhythmia event requiring therapy;
wherein said respiratory parameter determining circuit determines a respiratory frequency and a tidal volume using said sensed respiratory pattern and that determines a change of a range of change of a weighted combination of said respiratory frequency and said tidal volume.
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Accused Products
Abstract
In an implantable medical device such as an implantable cardiac defibrillator, and a method for classifying arrhythmia events, IEGM signals are analyzed to detect an arrhythmia event and a respiratory pattern of the patient is sensed. At least one respiratory parameter reflecting characteristics of the respiratory pattern of the patient is determined based on the sensed respiratory pattern and a respiratory measure corresponding to a change of a rate of change of the at least one respiratory parameter is calculated. The detected arrhythmia event is classified based on the respiratory measure and the IEGM signals, wherein arrhythmia events that satisfy at least a first criterion is classified as an arrhythmia event requiring therapy.
18 Citations
12 Claims
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1. An implantable medical device to discriminate between ventricular tachycardias (VTs) and supraventricular tachycardias (SVTs), said implantable medical device being configured to be connected to at least one medical lead adapted to be placed at or within a heart of a patient, said medical lead including at least one electrode adapted to sense electrical activity of said heart and to produce at least one signal representative of said electrical activity, said implantable medical device comprising:
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an intra-cardiac electrogram (IEGM) analyzing circuit that receives said signal representative of said electrical activity and to analyse IEGMs of said heart to detect an arrhythmia event; a sensing circuit that senses a respiratory pattern of said patient and to produce at least one signal representative of said respiratory pattern; a respiratory parameter determining circuit that determines at least one respiratory parameter reflecting characteristics of the respiratory pattern of said patient based on said sensed respiratory pattern and that determines a respiratory measure corresponding to a change of a rate of change of said at least one respiratory parameter; and an arrhythmia classifying circuit that classifies the detected arrhythmia event as a VT or SVT based on said respiratory measure, including classifying arrhythmia events that satisfy at least a first criterion for VT as an arrhythmia event requiring therapy; wherein said respiratory parameter determining circuit determines a respiratory frequency and a tidal volume using said sensed respiratory pattern and that determines a change of a range of change of a weighted combination of said respiratory frequency and said tidal volume. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method to discriminate between ventricular tachycardias (VTs) and supraventricular tachycardias (SVTs) in an implantable medical device, the implantable medical device being configured to be connected to at least one medical lead adapted to be placed at or within a heart of a patient, said medical lead including at least one electrode adapted to sense electrical activity of said heart and to produce at least one signal representative of said electrical activity, wherein said method comprises:
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analyzing IEGMs of said heart to detect an arrhythmia event; sensing a respiratory pattern of said patient producing at least one signal representative of said respiratory pattern; determining at least on respiratory parameter reflecting characteristics of the respiratory pattern of said patient based on said sensed respiratory pattern; determining a respiratory measure corresponding to a change of a rate of change of said at least on respiratory parameter; and classifying the detected arrhythmia event as a VT or SVT based on said respiratory measure, wherein arrhythmia events that satisfy at least a first criterion for VT is classified as an arrhythmia event requiring therapy; wherein said determining at least one respiratory parameter reflecting comprises determining a respiratory frequency and a tidal volume using said sensed respiratory pattern and wherein said determining a respiratory measure comprises determining a change of a rate of change of a weighted combination of said respiratory frequency and said tidal volume. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification