Systems, devices, and methods for tachyarrhythmia discrimination or therapy decisions
First Claim
1. A system comprising:
- an atrial contraction detector circuit, including an atrial rate detector circuit to detect an atrial rate between atrial contractions of a heart;
a ventricular contraction detector circuit, including a ventricular rate detector circuit to detect a ventricular rate between ventricular contractions of the heart;
a tachyarrhythmia classification circuit, configured to classify a tachyarrhythmia using a rhythm discrimination parameter having a value; and
a processor, coupled to the atrial and ventricular contraction detector circuits and the tachyarrhythmia classification circuit, the processor configured to;
determine a relationship between the atrial rate and the ventricular rate including comparing a difference between the atrial rate and the ventricular rate to a threshold value to determine whether the atrial rate is substantially equal to the ventricular rate; and
when the difference between the atrial rate and the ventricular rate exceeds the threshold value thereby indicating that the atrial rate is not substantially equal to the ventricular rate, adjust the value of the rhythm discrimination parameter using the relationship between the atrial rate and the ventricular rate, including adjusting the value of the rhythm discrimination parameter using both of (1) information about whether the atrial rate exceeds the ventricular rate or vice-versa; and
(2) a magnitude of the difference between the atrial rate and the ventricular rate.
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Accused Products
Abstract
Systems, devices, and methods detect or classify tachyarrhythmias or make a therapy decision. A tachyarrhythmia can be classified using a rhythm discrimination parameter having a value. In certain examples, the value of the rhythm discrimination parameter can be adjusted using a relationship between a detected atrial rate and a detected ventricular rate, or the value can be adjusted using information about at least one of the atrial rate or the ventricular rate in addition to using the relationship between the atrial rate and the ventricular rate. These techniques can improve the specificity of arrhythmia detection or classification, allow anti-tachyarrhythmia therapy to be better tailored to the particular tachyarrhythmia, or provide more automatic operation making it easier for a physician to use an implantable device.
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Citations
27 Claims
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1. A system comprising:
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an atrial contraction detector circuit, including an atrial rate detector circuit to detect an atrial rate between atrial contractions of a heart; a ventricular contraction detector circuit, including a ventricular rate detector circuit to detect a ventricular rate between ventricular contractions of the heart; a tachyarrhythmia classification circuit, configured to classify a tachyarrhythmia using a rhythm discrimination parameter having a value; and a processor, coupled to the atrial and ventricular contraction detector circuits and the tachyarrhythmia classification circuit, the processor configured to; determine a relationship between the atrial rate and the ventricular rate including comparing a difference between the atrial rate and the ventricular rate to a threshold value to determine whether the atrial rate is substantially equal to the ventricular rate; and when the difference between the atrial rate and the ventricular rate exceeds the threshold value thereby indicating that the atrial rate is not substantially equal to the ventricular rate, adjust the value of the rhythm discrimination parameter using the relationship between the atrial rate and the ventricular rate, including adjusting the value of the rhythm discrimination parameter using both of (1) information about whether the atrial rate exceeds the ventricular rate or vice-versa; and
(2) a magnitude of the difference between the atrial rate and the ventricular rate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A system comprising:
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means for detecting atrial contractions of a heart and an atrial rate between the detected atrial contractions; means for detecting ventricular contractions of the heart and a ventricular rate between the detected ventricular contractions; means for classifying a tachyarrhythmia using a rhythm discrimination parameter having a value; means for determining a relationship between the atrial rate and the ventricular rate including comparing a difference between the atrial rate and the ventricular rate to a threshold value to determine whether the atrial rate is substantially equal to the ventricular rate; and means for adjusting, when the difference between the atrial rate and the ventricular rate exceeds the threshold value thereby indicating that the atrial rate is not substantially equal to the ventricular rate, the value of the rhythm discrimination parameter using the relationship between the atrial rate and the ventricular rate, including adjusting the value of the rhythm discrimination parameter using both of (1) information about whether the atrial rate exceeds the ventricular rate or vice-versa; and
(2) a magnitude of the difference between the atrial rate and the ventricular rate.
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15. A method comprising:
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detecting atrial contractions of a heart and an atrial rate between the detected atrial contractions; detecting ventricular contractions of the heart and a ventricular rate between the detected ventricular contractions; classifying a tachyarrhythmia using a rhythm discrimination parameter having a value; determining a relationship between the atrial rate and the ventricular rate including comparing a difference between the atrial rate and the ventricular rate to a threshold value to determine whether the atrial rate is substantially equal to the ventricular rate; and when the difference between the atrial rate and the ventricular rate exceeds the threshold value, adjusting the value of the rhythm discrimination parameter using the relationship between the atrial rate and the ventricular rate, including adjusting the value of the rhythm discrimination parameter using both of (1) information about whether the atrial rate exceeds the ventricular rate or vice-versa; and
(2) a magnitude of the difference between the atrial rate and the ventricular rate. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification