Classifying tachyarrhythmia using time interval between ventricular depolarization and mitral valve closure
First Claim
1. A system comprising a processor circuit with executable instructions to determine whether a dissociated ventricular tachyarrhythmia exists using time intervals, in which each time interval is between a first time indicative of a ventricular depolarization and a second time indicative of a mitral valve closure.
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Accused Products
Abstract
A cardiac rhythm management system measures a time interval between a first fiducial marker indicative of a ventricular depolarization (e.g., a Q-wave, an R-wave, etc.) and a second fiducial marker indicative of a subsequent mitral valve closure (MVC) occurring during the same cardiac cycle. Such time intervals are used for detecting atrioventricular (AV) dissociation. The AV dissociation may, in turn, be used for discriminating between a supraventricular tachyarrhythmia (SVT) and a ventricular tachyarrhythmia (VT) or for any other diagnostic or therapeutic purpose. The AV dissociation and/or SVT/VT discrimination information may be communicated from an implantable cardiac rhythm management device to an external interface and/or used to determine the nature of therapy delivered to the subject. In a further example, amplitudes indicative of the MVCs are also used for determining whether AV dissociation exists.
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Citations
50 Claims
- 1. A system comprising a processor circuit with executable instructions to determine whether a dissociated ventricular tachyarrhythmia exists using time intervals, in which each time interval is between a first time indicative of a ventricular depolarization and a second time indicative of a mitral valve closure.
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18. A system comprising:
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a heart signal sensing circuit, comprising a depolarization detector circuit to detect first times indicative of ventricular depolarizations occurring during cardiac cycles; a mitral valve closure sensor circuit, to detect second times indicative of mitral valve closures; a timer circuit, coupled to the heart signal sensing circuit and to the mitral valve closure sensor circuit, to measure time intervals between one of the first times and one of the second times within the same cardiac cycle; a memory circuit, coupled to the timer circuit, the memory circuit configured to store the time intervals; and a processor circuit, coupled to or including the memory circuit, the processor circuit including executable instructions to determine whether a dissociated tachyarrhythmia exists using the time intervals. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A method comprising:
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acquiring a first signal to obtain first times indicative of ventricular depolarizations; acquiring a second signal to obtain second times indicative of mitral valve closures occurring during respective cardiac cycles of the ventricular depolarizations; measuring time intervals, each of the time intervals measured between one of the first times and one of the second times within the same cardiac cycle; and determining whether a dissociated ventricular tachyarrhythmia exists using the time intervals. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50)
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Specification