Episode classifier algorithm
First Claim
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1. A method comprising:
- collecting a sinus template from a first ventricular EGM signal,wherein the sinus template comprises a portion of the first ventricular EGM signal including at least one ventricular beat, andwherein collecting the sinus template comprises collecting the sinus template from a portion of the ventricular EGM that occurred when the ventricular EGM signal and an atrial EGM signal indicated a one to one ratio of atrial events to ventricular events, a P-R interval greater than a first predetermined threshold, an R-R interval greater than a second predetermined threshold, and two consecutive R-R intervals within a predetermined range;
comparing the sinus template to a second ventricular EGM signal; and
determining, based on the comparison, whether the morphology of the second ventricular EGM signal matches the sinus template.
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Abstract
The present disclosure is directed to the classification of cardiac episodes using an algorithm. In various examples, an episode classification algorithm evaluates electrogram signal data collected by an implantable medical device. The episode classification algorithm may classify may include a sinus template and a comparison of the electrogram signal to the sinus template. Possible classifications of the cardiac episode may include, for example, unknown, inappropriate, appropriate, supraventricular tachycardia, ventricular tachycardia, ventricular fibrillation or ventricular over-sensing.
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Citations
22 Claims
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1. A method comprising:
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collecting a sinus template from a first ventricular EGM signal, wherein the sinus template comprises a portion of the first ventricular EGM signal including at least one ventricular beat, and wherein collecting the sinus template comprises collecting the sinus template from a portion of the ventricular EGM that occurred when the ventricular EGM signal and an atrial EGM signal indicated a one to one ratio of atrial events to ventricular events, a P-R interval greater than a first predetermined threshold, an R-R interval greater than a second predetermined threshold, and two consecutive R-R intervals within a predetermined range; comparing the sinus template to a second ventricular EGM signal; and determining, based on the comparison, whether the morphology of the second ventricular EGM signal matches the sinus template. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A device comprising:
a processor configured to collect a sinus template from a first ventricular EGM signal, wherein the sinus template comprises a portion of the first ventricular EGM signal including at least one ventricular beat, and wherein collecting the sinus template comprises collecting the sinus template from a portion of the ventricular EGM that occurred when the ventricular EGM signal and an atrial EGM signal indicated a one to one ratio of atrial events to ventricular events, a P-R interval greater than a first predetermined threshold, an R-R interval greater than a second predetermined threshold; and
two consecutive R-R intervals within a predetermined range;compare the sinus template to a second ventricular EGM signal, and determine, based on the comparison, whether the morphology of the second ventricular EGM signal matches the sinus template. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A device comprising:
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means for collecting a sinus template from an EGM signal;
the sinus template collected when the EGM signal has a one to one ratio of atrial events to ventricular events, a P-R interval greater than 80 milliseconds (ms), an R-R interval greater than 500 ms; and
two consecutive R-R intervals within 50 ms of each other;means for comparing the sinus ventricular beat template to a second EGM signal, and means for determining, based on the comparison, whether the morphology of the second EGM signal matches the sinus template.
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22. A computer-readable medium containing instructions, the instructions causing a programmable processor to:
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collect a sinus template from a first ventricular EGM signal, wherein the sinus template comprises a portion of the first ventricular EGM signal including at least one ventricular beat, and wherein collecting the sinus template comprises collecting the sinus template from a portion of the ventricular EGM that occurred when the ventricular EGM signal and an atrial EGM signal indicated a one to one ratio of atrial events to ventricular events, a P-R interval greater than a first predetermined threshold, an R-R interval greater than a second predetermined threshold; and
two consecutive R-R intervals within a predetermined range;compare the sinus template to a second ventricular EGM signal, and determine, based on the comparison, whether the morphology of the second ventricular EGM signal matches the sinus template.
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Specification