Apparatus and method for treating ventricular tachyarrhythmias
First Claim
1. A method, comprising:
- sensing atrial events and ventricular events;
determining ventricular interval rates from pairs of consecutively sensed ventricular events in a detection window;
classifying each ventricular interval rate of the ventricular interval rates as a fast ventricular interval or a slow ventricular interval for a rate zone by comparing the each ventricular interval rate to a lower rate threshold of the rate zone;
declaring the detection window satisfied in response to a first predetermined percentage of the ventricular interval rates in the detection window being classified as the fast ventricular intervals;
starting a first time interval in response to the detection window being declared satisfied, the first time interval having a duration for the rate zone; and
determining whether to inhibit a ventricular tachycardia therapy at the end of the first time interval.
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Abstract
A system and method for selectively treating a ventricular tachycardia based on sensed atrial and ventricular intervals from the patient'"'"'s heart. A detection window of the ten most recent atrial and ventricular intervals are analyzed for the occurrence of either tachycardia or fibrillation. When a majority of the sensed intervals are satisfied, the apparatus starts a duration time interval. Ventricular intervals and atrial intervals are compare, ventricular interval greater than the atrial interval by a bias factor the system delivers tachycardia therapy to the heart. Alternatively, the method withholds tachycardia therapy to the heart when the atrial rate is classified as atrial fibrillation and the ventricular response is unstable.
186 Citations
20 Claims
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1. A method, comprising:
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sensing atrial events and ventricular events; determining ventricular interval rates from pairs of consecutively sensed ventricular events in a detection window; classifying each ventricular interval rate of the ventricular interval rates as a fast ventricular interval or a slow ventricular interval for a rate zone by comparing the each ventricular interval rate to a lower rate threshold of the rate zone; declaring the detection window satisfied in response to a first predetermined percentage of the ventricular interval rates in the detection window being classified as the fast ventricular intervals; starting a first time interval in response to the detection window being declared satisfied, the first time interval having a duration for the rate zone; and determining whether to inhibit a ventricular tachycardia therapy at the end of the first time interval. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system, comprising:
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sensing circuitry configured to sense atrial events and ventricular events; therapy delivery circuitry configured to deliver a ventricular tachycardia therapy; and control circuitry configured to; determine ventricular interval rates from pairs of consecutively sensed ventricular events in a detection window; classify each ventricular interval rate of the ventricular interval rates as a fast ventricular interval or a slow ventricular interval for a rate zone by comparing the each ventricular interval rate to a lower rate threshold of the rate zone; declare the detection window satisfied in response to a first predetermined percentage of the ventricular interval rates in the detection window being classified as the fast ventricular intervals; start a first time interval having a duration for the rate zone in response to the detection window being declared satisfied; and determine whether to inhibit a ventricular tachycardia therapy at the end of the first time interval. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A system, comprising:
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means for sensing atrial events and ventricular events; means for determining ventricular interval rates from pairs of consecutively sensed ventricular events in a detection window; means for classifying each ventricular interval rate of the ventricular interval rates as a fast ventricular interval or a slow ventricular interval for a rate zone by comparing each ventricular interval rate to a lower rate threshold of the rate zone; means for declaring the detection window satisfied when a first predetermined percentage of the ventricular interval rates in the detection window are classified as the fast ventricular intervals; means for starting a first time interval once the detection window is declared satisfied, the first time interval having a duration for the rate zone; and means for determining whether to inhibit a ventricular tachycardia therapy at the end of the first time interval. - View Dependent Claims (18, 19, 20)
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Specification