Method and apparatus for morphology-based arrhythmia classification using cardiac and other physiological signals
First Claim
1. A tachyarrhythmia detection and classification system, comprising:
- a cardiac sensing circuit to sense at least one cardiac signal;
a tachyarrhythmia detector, coupled to the cardiac sensing circuit, to detect a tachyarrhythmia episode from the at least one cardiac signal;
one or more physiological sensors to sense one or more physiological signals;
a physiological parameter generator, coupled to the one or more physiological sensors, to derive one or more physiological parameters from the one or more physiological signals; and
a morphology-based tachyarrhythmia classification module coupled to the tachyarrhythmia detector, the morphology-based tachyarrhythmia classification module including;
a feature extractor, coupled to the cardiac sensing circuit, to extract arrhythmic morphological features of an arrhythmic heart beat of the detected tachyarrhythmia episode from the at least one cardiac signal;
a similarity analyzer, coupled to the cardiac sensing circuit, to compute a measure of similarity between the arrhythmic morphological features and template morphological features of a template heart beat of a known type cardiac rhythm;
a classifier, coupled to the similarity analyzer, to classify the arrhythmic heart beat using the measure of similarity and a dynamically adjustable beat classification threshold (T); and
a threshold generator, coupled to the physiological parameter generator and the classifier, to adjust the beat classification threshold (T) using the one or more physiological parameters.
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Abstract
A tachyarrhythmia detection and classification system classifies tachyarrhythmias based on an analysis of morphological features of a cardiac signal enhanced by using one or more physiological parameters indicative of hemodynamic stability and/or activity level. The tachyarrhythmia detection and classification system computes a measure of similarity between an arrhythmic waveform of the cardiac signal a template waveform for that cardiac signal, such as a correlation coefficient representative of the correlation between morphological features of the arrhythmic waveform and morphological features of the template waveform. A detected tachyarrhythmia episode is classified by comparing the measure of similarity to a threshold that is dynamically adjusted using the one or more physiological parameters.
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Citations
40 Claims
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1. A tachyarrhythmia detection and classification system, comprising:
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a cardiac sensing circuit to sense at least one cardiac signal;
a tachyarrhythmia detector, coupled to the cardiac sensing circuit, to detect a tachyarrhythmia episode from the at least one cardiac signal;
one or more physiological sensors to sense one or more physiological signals;
a physiological parameter generator, coupled to the one or more physiological sensors, to derive one or more physiological parameters from the one or more physiological signals; and
a morphology-based tachyarrhythmia classification module coupled to the tachyarrhythmia detector, the morphology-based tachyarrhythmia classification module including;
a feature extractor, coupled to the cardiac sensing circuit, to extract arrhythmic morphological features of an arrhythmic heart beat of the detected tachyarrhythmia episode from the at least one cardiac signal;
a similarity analyzer, coupled to the cardiac sensing circuit, to compute a measure of similarity between the arrhythmic morphological features and template morphological features of a template heart beat of a known type cardiac rhythm;
a classifier, coupled to the similarity analyzer, to classify the arrhythmic heart beat using the measure of similarity and a dynamically adjustable beat classification threshold (T); and
a threshold generator, coupled to the physiological parameter generator and the classifier, to adjust the beat classification threshold (T) using the one or more physiological parameters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method for detecting and classifying tachyarrhythmias, the method comprising:
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sensing at least one cardiac signal;
detecting a tachyarrhythmia episode from the at least one cardiac signal;
extracting arrhythmic morphological features of an arrhythmic heart beat of the detected tachyarrhythmia episode from the at least one cardiac signal;
computing a measure of similarity between the arrhythmic morphological features and template morphological features of a template heart beat of a known type cardiac rhythm for each arrhythmic heart beat of a plurality of arrhythmic heart beats;
classifying the detected tachyarrhythmia episode using values of the measure of similarity computed for the plurality of arrhythmic heart beats and a dynamically adjustable beat classification threshold (T);
sensing one or more physiological signals;
deriving one or more physiological parameters from the one or more physiological signals; and
adjusting the beat classification threshold (T) using the one or more physiological parameters. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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Specification