System and method of classifying tachyarrhythmia episodes as associated or disassociated
First Claim
1. A system, comprising:
- control circuitry where the control circuitry receives a first cardiac signal and a second cardiac signal sensed during a cardiac episode, where the first cardiac signal includes indications of depolarizations in a first cardiac area and the second cardiac signal includes indications of depolarizations in a second cardiac area, the control circuitry including;
a first depolarization detector circuit to detect occurrence of primary depolarizations in the first cardiac signal;
a second depolarization detector circuit to detect occurrence of auxiliary depolarizations in the second cardiac signal;
a cardiac depolarization counting circuit coupled to the first depolarization detector circuit and the second depolarization detector circuit, where the cardiac depolarization counting circuit counts a first number (K) of auxiliary depolarizations occurring during a first portion of a first time interval surrounding each of one or more primary depolarizations of the primary depolarizations; and
a microprocessor coupled to the cardiac depolarization counting circuit, where the microprocessor determines whether the primary depolarizations and the auxiliary depolarizations in the cardiac episode are associated or disassociated based on K.
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Abstract
A method and system for classifying tachyarrhythmia episodes as associated or disassociated. Primary and auxiliary depolarizations are detected from different cardiac regions during a tachycardia episode. A first time interval is positioned to surround each of one or more primary depolarizations, including auxiliary depolarizations that occur in the first time interval. The auxiliary depolarizations occurring in the first time interval are then counted. Based on the number and the location of the auxiliary depolarizations counted in the first time intervals, the one or more primary depolarizations and the auxiliary depolarizations of the tachycardia episode are classified as disassociated or associated.
84 Citations
50 Claims
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1. A system, comprising:
control circuitry where the control circuitry receives a first cardiac signal and a second cardiac signal sensed during a cardiac episode, where the first cardiac signal includes indications of depolarizations in a first cardiac area and the second cardiac signal includes indications of depolarizations in a second cardiac area, the control circuitry including;
a first depolarization detector circuit to detect occurrence of primary depolarizations in the first cardiac signal;
a second depolarization detector circuit to detect occurrence of auxiliary depolarizations in the second cardiac signal;
a cardiac depolarization counting circuit coupled to the first depolarization detector circuit and the second depolarization detector circuit, where the cardiac depolarization counting circuit counts a first number (K) of auxiliary depolarizations occurring during a first portion of a first time interval surrounding each of one or more primary depolarizations of the primary depolarizations; and
a microprocessor coupled to the cardiac depolarization counting circuit, where the microprocessor determines whether the primary depolarizations and the auxiliary depolarizations in the cardiac episode are associated or disassociated based on K. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system, comprising:
control circuitry where the control circuitry receives a first cardiac signal and a second cardiac signal sensed during a cardiac episode, where the first cardiac signal includes indications of depolarizations in a first cardiac area and the second cardiac signal includes indications of depolarizations in a second cardiac area, the control circuitry including;
a first depolarization detector circuit to detect occurrence of primary depolarizations in the first cardiac signal;
a second depolarization detector circuit to detect occurrence of auxiliary depolarizations in the second cardiac signal;
a cycle length interval circuit coupled to the second depolarization detector circuit, where the cycle length interval circuit measures auxiliary cycle lengths between pairs of consecutively sensed auxiliary depolarizations in a measurement window interval;
a cardiac data analyzing circuit coupled to the cycle length interval circuit, where the cardiac data analyzing circuit calculates a first time interval based on an average value and an standard deviation value of the auxiliary cycle lengths and positions the first time interval to surround each of one or more primary depolarizations of the primary depolarizations;
a cardiac depolarization counting circuit coupled to the first depolarization detector circuit and the second depolarization detector circuit, where the cardiac depolarization counting circuit counts a number of auxiliary depolarizations occurring during the first time interval; and
a microprocessor coupled to the cardiac depolarization counting circuit, where the microprocessor determines whether the primary depolarizations and the auxiliary depolarizations in the cardiac episode are associated or disassociated based on the number of auxiliary depolarizations occurring during the first time interval. - View Dependent Claims (10, 11, 12, 13, 14, 15, 17, 18, 19, 20, 21, 22, 23, 24, 26, 27, 28, 29, 30, 31, 32)
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16. A system, comprising:
control circuitry where the control circuitry receives a first cardiac signal and a second cardiac signal sensed during a cardiac episode, where the first cardiac signal includes indications of depolarizations in a first cardiac area and the second cardiac signal includes indications of depolarizations in a second cardiac area, the control circuitry including;
a first depolarization detector circuit to detect occurrence of primary depolarizations in the first cardiac signal;
a second depolarization detector circuit to detect occurrence of auxiliary depolarizations in the second cardiac signal;
a cardiac data analyzing circuit coupled to the first depolarization detector circuit and the second depolarization detector circuit, where the cardiac data analyzing circuit positions a first time interval to surround each of one or more primary depolarizations of the primary depolarizations and a second time interval to surround each of one or more auxiliary depolarizations of the auxiliary depolarizations;
a cardiac depolarization counting circuit coupled to the cardiac data analyzing circuit, where the cardiac depolarization counting circuit counts the number of auxiliary depolarizations occurring during the first time interval and the number of primary depolarizations occurring during the second time interval; and
a microprocessor coupled to the cardiac depolarization counting circuit, where the microprocessor determines whether the primary depolarizations and the auxiliary depolarizations in the cardiac episode are associated or disassociated based on the number of primary depolarizations occurring during the second time interval and the number of auxiliary depolarizations occurring during the first time interval.
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25. A method, comprising:
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sensing at least one cardiac signal during a cardiac episode, where the at least one cardiac signal includes auxiliary depolarizations and primary depolarizations;
measuring auxiliary cycle lengths between pairs of consecutively sensed auxiliary depolarizations in a measurement window interval;
calculating an average value (XXavg) and a standard deviation value (XXsd) of the auxiliary cycle lengths;
calculating a first time interval, where the first time interval has a value equal to;
(XXavg−
Y*XXsd),where Y is a predetermined constant;
positioning the first time interval to surround each of one or more primary depolarizations of the primary depolarizations;
counting auxiliary depolarizations over the first time interval; and
determining whether the primary depolarizations and the auxiliary depolarizations in the cardiac episode are disassociated or associated based on a number of the auxiliary depolarizations counted over the first time interval.
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33. A method, comprising:
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sensing at least one cardiac signal during a cardiac episode, where the at least one cardiac signal includes auxiliary depolarizations and primary depolarizations;
counting a total number (N) of auxiliary depolarizations over a first time interval surrounding each of one or more primary depolarizations of the primary depolarizations;
counting a first number (K) of auxiliary depolarizations over a first portion of the first time interval;
calculating K/N; and
determining whether the primary depolarizations and the auxiliary depolarizations in the cardiac episode are disassociated or associated based on K/N. - View Dependent Claims (34, 35, 37, 38, 39, 40, 41)
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36. A method, comprising:
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sensing at least one cardiac signal during a cardiac episode, where the at least one cardiac signal includes auxiliary depolarizations and primary depolarizations;
positioning a first time interval having an approximate midpoint location to surround each of one or more primary depolarizations of the primary depolarizations such that the approximate midpoint location is positioned at each of the one or more primary depolarizations;
counting auxiliary depolarizations over the first time interval; and
determining whether the primary depolarizations and the auxiliary depolarizations in the cardiac episode are disassociated or associated based on a number of the auxiliary depolarizations counted over the first time interval.
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42. A method, comprising:
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sensing at least one cardiac signal during a cardiac episode, where the at least one cardiac signal includes auxiliary depolarizations and primary depolarizations;
counting the auxiliary depolarizations over a first time interval surrounding each of one or more primary depolarizations of the primary depolarizations;
counting the primary depolarizations over a second time interval surrounding each of one or more auxiliary depolarizations of the auxiliary depolarizations; and
determining whether the primary depolarizations and the auxiliary depolarizations in the cardiac episode are disassociated or associated based on a number of the auxiliary depolarizations counted over the first time interval and a number of the primary depolarizations counted over the second time interval. - View Dependent Claims (43, 44, 45, 46, 47, 48, 49, 50)
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Specification