Method and apparatus for discriminating tachycardia events in a medical device
First Claim
1. A medical device for delivering therapy in response to a cardiac event, comprising:
- a housing;
sensing circuitry positioned within the housing and configured to obtain a cardiac signal sensed via a plurality of electrodes electrically coupled to the sensing circuitry, the plurality of electrodes forming a first sensing vector and a second sensing vector; and
a processor positioned within the housing and configured to analyze the sensed cardiac signal to identify the cardiac event as one of a shockable event or a non-shockable event based on a first segment of the cardiac signal sensed along the first sensing vector during a first predetermined sensing window and a second segment of the cardiac signal simultaneously sensed along the second sensing vector during the predetermined sensing window, determine, in response to the cardiac event being identified as a shockable event, a first R-wave morphology corresponding to R-waves of a third segment of the cardiac signal subsequently sensed along the first sensing vector during a second predetermined sensing window and a second R-wave morphology corresponding to R-waves of a fourth segment of the cardiac signal subsequently sensed along the second sensing vector during the second predetermined sensing window, determine whether the third segment of the cardiac signal and fourth segment of the cardiac signal are within a ventricular tachycardia shock zone, and identify the cardiac event as one of a monomorphic ventricular tachycardia or a polymorphic ventricular tachycardia based on the determined first R-wave morphology, second R-wave morphology, and the third and fourth segments of the cardiac signal being within the ventricular tachycardia shock zone.
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Abstract
A method and medical device for detecting a cardiac event that includes sensing cardiac signals from a plurality of electrodes, the plurality of electrodes forming a first sensing vector and a second sensing vector, determining, in response to the cardiac event being identified as a shockable event, a first R-wave morphology corresponding to R-waves of a next interval subsequently sensed along the first sensing vector during the predetermined sensing window and a second R-wave morphology corresponding to R-waves of a next interval subsequently sensed along the second sensing vector, determining whether the next interval subsequently sensed along the first sensing vector and the next interval subsequently sensed along the second sensing vector satisfy a morphology metric, and identifying the cardiac event as one of a monomorphic ventricular tachycardia and a polymorphic ventricular tachycardia in response to the determined first R-wave morphology, second R-wave morphology, and the next interval subsequently sensed along the first sensing vector and the next interval subsequently sensed along the second sensing vector not satisfying the morphology metric.
212 Citations
10 Claims
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1. A medical device for delivering therapy in response to a cardiac event, comprising:
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a housing; sensing circuitry positioned within the housing and configured to obtain a cardiac signal sensed via a plurality of electrodes electrically coupled to the sensing circuitry, the plurality of electrodes forming a first sensing vector and a second sensing vector; and a processor positioned within the housing and configured to analyze the sensed cardiac signal to identify the cardiac event as one of a shockable event or a non-shockable event based on a first segment of the cardiac signal sensed along the first sensing vector during a first predetermined sensing window and a second segment of the cardiac signal simultaneously sensed along the second sensing vector during the predetermined sensing window, determine, in response to the cardiac event being identified as a shockable event, a first R-wave morphology corresponding to R-waves of a third segment of the cardiac signal subsequently sensed along the first sensing vector during a second predetermined sensing window and a second R-wave morphology corresponding to R-waves of a fourth segment of the cardiac signal subsequently sensed along the second sensing vector during the second predetermined sensing window, determine whether the third segment of the cardiac signal and fourth segment of the cardiac signal are within a ventricular tachycardia shock zone, and identify the cardiac event as one of a monomorphic ventricular tachycardia or a polymorphic ventricular tachycardia based on the determined first R-wave morphology, second R-wave morphology, and the third and fourth segments of the cardiac signal being within the ventricular tachycardia shock zone. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification