Atrial arrhythmia episode detection in a cardiac medical device
First Claim
1. A method of detecting an atrial tachyarrhythmia episode in a medical device, comprising:
- sensing a cardiac signal;
identifying R-waves in the cardiac signal attendant ventricular depolarizations;
determining classification factors from the R-waves identified over a first predetermined time period;
classifying the first predetermined time period as atrial tachyarrhythmia based on comparing the determined classification factors to classification criteria without detecting an atrial tachyarrhythmia episode based only on the first predetermined time period;
adjusting a classification criterion of the classification criteria from a first classification criterion to a second classification criterion after classifying the first time period as atrial tachyarrhythmia and prior to detecting an atrial tachyarrhythmia episode;
classifying at least one subsequent time period as atrial tachyarrhythmia by comparing classification factors determined over the subsequent time period to the adjusted classification criterion; and
detecting an atrial tachyarrhythmia episode in response to at least one subsequent time period being classified as atrial tachyarrhythmia based on the adjusted classification criterion.
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Abstract
A medical device is configured to detect an atrial tachyarrhythmia episode. The device senses a cardiac signal, identifies R-waves in the cardiac signal attendant ventricular depolarizations and determines classification factors from the R-waves identified over a predetermined time period. The device classifies the predetermined time period as one of unclassified, atrial tachyarrhythmia and non-atrial tachyarrhythmia by comparing the determined classification factors to classification criteria. A classification criterion is adjusted from a first classification criterion to a second classification criterion after at least one time period being classified as atrial tachyarrhythmia. An atrial tachyarrhythmia episode is detected by the device in response to at least one subsequent time period being classified as atrial tachyarrhythmia based on the adjusted classification criterion.
155 Citations
20 Claims
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1. A method of detecting an atrial tachyarrhythmia episode in a medical device, comprising:
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sensing a cardiac signal; identifying R-waves in the cardiac signal attendant ventricular depolarizations; determining classification factors from the R-waves identified over a first predetermined time period; classifying the first predetermined time period as atrial tachyarrhythmia based on comparing the determined classification factors to classification criteria without detecting an atrial tachyarrhythmia episode based only on the first predetermined time period; adjusting a classification criterion of the classification criteria from a first classification criterion to a second classification criterion after classifying the first time period as atrial tachyarrhythmia and prior to detecting an atrial tachyarrhythmia episode; classifying at least one subsequent time period as atrial tachyarrhythmia by comparing classification factors determined over the subsequent time period to the adjusted classification criterion; and detecting an atrial tachyarrhythmia episode in response to at least one subsequent time period being classified as atrial tachyarrhythmia based on the adjusted classification criterion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A medical device for detecting an atrial tachyarrhythmia episode, comprising:
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sensing circuitry configured to receive a cardiac signal from a plurality of electrodes coupled to the medical device; and a processor configured to; identify R-waves in the cardiac signal attendant ventricular depolarizations; determine classification factors from the R-waves identified over a first predetermined time period; classify the first predetermined time period as atrial tachyarrhythmia based on comparing the determined classification factors to classification criteria without detecting an atrial tachyarrhythmia episode based only on the first predetermined time period; adjust a classification criterion of the classification criteria from a first classification criterion to a second classification criterion after the first time period being classified as atrial tachyarrhythmia and prior to detecting an atrial tachyarrhythmia episode; classify at least one subsequent time period as atrial tachyarrhythmia by comparing classification factors determined over the subsequent time period to the adjusted classification criterion; and detect an atrial tachyarrhythmia episode in response to at least one subsequent time period being classified as atrial tachyarrhythmia based on the adjusted classification criterion. - View Dependent Claims (17, 18, 19, 20)
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Specification