Electrogram storage for suspected non-physiological episodes
First Claim
1. A method comprising:
- receiving a cardiac electrical signal and monitoring heart rate based on the cardiac electrical signal;
detecting a tachyarrhythmia based on the monitored heart rate exceeding a first predetermined threshold;
determining whether the detected tachyarrhythmia is a non-sustained tachyarrhythmia based on the length of the detected tachyarrhythmia episode;
identifying a plurality of events in the cardiac electrical signal during the detected non-sustained tachyarrhythmia episode as cardiac depolarizations;
determining a rate of at least some of the identified events;
determining that the detected non-sustained tachyarrhythmia is a suspected non-physiological non-sustained tachyarrhythmia caused by a sensing integrity condition, based on the rate of the at least some of the identified events; and
storing an electrogram for the suspected non-physiological non-sustained tachyarrhythmia based on the detection, the electrogram including at least a portion of the cardiac electrical signal.
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Abstract
Techniques for storing electrograms (EGMS) that are associated with sensed episodes or events that may be non-physiological and, instead, associated with a sensing integrity condition are described. In some examples, a device or system identifies suspected non-physiological NSTs, and stores an EGM for the suspected non-physiological NSTs within an episode log. In some examples, a device or system determines whether to store an EGM for a suspected non-physiological episode or event based on whether an impedance integrity criterion has been satisfied. For example, a device or system may store an EGM for a detected short interval if the impedance integrity criterion has been met. In some examples, a device or system determines whether to buffer EGM data based on whether an impedance integrity criterion or other sensing integrity criterion has been met.
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Citations
18 Claims
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1. A method comprising:
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receiving a cardiac electrical signal and monitoring heart rate based on the cardiac electrical signal; detecting a tachyarrhythmia based on the monitored heart rate exceeding a first predetermined threshold; determining whether the detected tachyarrhythmia is a non-sustained tachyarrhythmia based on the length of the detected tachyarrhythmia episode; identifying a plurality of events in the cardiac electrical signal during the detected non-sustained tachyarrhythmia episode as cardiac depolarizations; determining a rate of at least some of the identified events; determining that the detected non-sustained tachyarrhythmia is a suspected non-physiological non-sustained tachyarrhythmia caused by a sensing integrity condition, based on the rate of the at least some of the identified events; and storing an electrogram for the suspected non-physiological non-sustained tachyarrhythmia based on the detection, the electrogram including at least a portion of the cardiac electrical signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system comprising:
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a memory; a plurality of electrodes; an electrical sensing module that receives a cardiac electrical signal from the plurality of electrodes and monitors heart rate based on the cardiac electrical signal; a non-physiological non-sustained tachyarrhythmia detection module configured to detect a tachyarrhythmia based on the monitored heart rate exceeding a first predetermined threshold determine whether the detected tachyarrhythmia is a non-sustained tachyarrhythmia based on the length of the detected tachyarrhythmia episode; identify a plurality of events in the cardiac electrical signal during the detected non-sustained tachyarrhythmia episode as cardiac depolarizations; determine a rate of at least some of the identified events; and determine that the detected non-sustained tachyarrhythmia is a suspected non-physiological non-sustained tachyarrhythmia caused by a sensing integrity condition, based on the rate of the at least some of the identified events; and an episode storage evaluation module that controls storage of an electrogram for the suspected non-physiological non-sustained tachyarrhythmia within the memory based on the detection, the electrogram including at least a portion of the cardiac electrical signal. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. The system of 14, wherein the implantable medical device comprises at least one of a cardiac pacemaker, a cardioverter, or a defibrillator.
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16. A system comprising:
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means for receiving a cardiac electrical signal; means for monitoring heart rate based on the cardiac signal; means for detecting a tachyarrhythmia based on the monitored heart rate exceeding a first predetermined threshold; means for determining whether the detected tachyarrhythmia is a non-sustained tachyarrhythmia based on the length of the detected tachyarrhythmia episode; means for identifying a plurality of events in the cardiac electrical signal during the detected non-sustained tachyarrhythmia episode as cardiac depolarizations; means for determining a rate of at least some of the identified events; means for determining that the detected non-sustained tachyarrhythmia is a suspected non-physiological non-sustained tachyarrhythmia caused by a sensing integrity condition, based on the rate of the at least some of the identified events; and means for storing an electrogram for the suspected non-physiological non-sustained tachyarrhythmia based on the detection, the electrogram including at least a portion of the cardiac electrical signal.
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17. A computer readable medium comprising instructions that cause a processor to:
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detect a tachyarrhythmia based on a cardiac electrical signal and a monitored heart rate exceeding a first predetermined threshold; detect a tachyarrhythmia based on the monitored heart rate exceeding a first predetermined threshold determine whether the detected tachyarrhythmia is a non-sustained tachyarrhythmia based on the length of the detected tachyarrhythmia episode; identify a plurality of events in the cardiac electrical signal during the detected non-sustained tachyarrhythmia episode as cardiac depolarizations; determine a rate of at least some of the identified events; and determine that the detected non-sustained tachyarrhythmia is a suspected non-physiological non-sustained tachyarrhythmia caused by a sensing integrity condition, based on the rate of the at least some of the identified events; and control storage of an electrogram for the suspected non-physiological non-sustained tachyarrhythmia based on the detection, the electrogram including at least a portion of the cardiac electrical signal.
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18. A system comprising:
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a memory; a plurality of electrodes; an electrical sensing module that receives a cardiac electrical signal from the plurality of electrodes and measures an impedance of an electrical path comprising the electrodes; and
a processor that identifies a plurality of events within the cardiac electrical signal, compares an interval between two consecutive events to a threshold, and determines whether to store an electrogram for the interval within the memory based on the comparison and the impedance measurement, the electrogram including at least a portion of the cardiac electrical signal, wherein the processor detects a suspected non-physiological non-sustained tachyarrhythmia based on the cardiac electrical signal, and determines not to store the electrogram for the interval based on the detection of the non-physiological non-sustained tachyarrhythmia.
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Specification