Apparatus and method for treating ventricular tachyarrhythmias
First Claim
1. A method, comprising:
- sensing atrial and ventricular events representative of cardiac rhythms;
determining ventricular intervals using the sensed ventricular events;
detecting a ventricular tachyarrhythmia using the ventricular intervals and predetermined rate zones;
starting a first time interval in response to the ventricular tachyarrhythmia being detected in a predetermined tachycardia rate zone of the predetermined rate zones;
determining whether at least a predetermined percentage of the ventricular intervals during a detection window are classified as fast ventricular intervals in the predetermined tachycardia rate zone;
analyzing the cardiac rhythms during the first time interval to assess an origin of the ventricular tachyarrhythmia;
resetting the first time interval in response to the at least the predetermined percentage of the ventricular intervals during the detection window not being classified as the fast ventricular intervals; and
delaying or inhibiting a ventricular tachycardia therapy at an end of the first time interval if the origin of the ventricular tachyarrhythmia is in an atrium.
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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.
183 Citations
14 Claims
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1. A method, comprising:
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sensing atrial and ventricular events representative of cardiac rhythms; determining ventricular intervals using the sensed ventricular events; detecting a ventricular tachyarrhythmia using the ventricular intervals and predetermined rate zones; starting a first time interval in response to the ventricular tachyarrhythmia being detected in a predetermined tachycardia rate zone of the predetermined rate zones; determining whether at least a predetermined percentage of the ventricular intervals during a detection window are classified as fast ventricular intervals in the predetermined tachycardia rate zone; analyzing the cardiac rhythms during the first time interval to assess an origin of the ventricular tachyarrhythmia; resetting the first time interval in response to the at least the predetermined percentage of the ventricular intervals during the detection window not being classified as the fast ventricular intervals; and delaying or inhibiting a ventricular tachycardia therapy at an end of the first time interval if the origin of the ventricular tachyarrhythmia is in an atrium. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An implantable cardioverter-defibrillator, comprising:
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sensing circuitry adapted to sense atrial and ventricular events representative of cardiac rhythms; therapy delivery circuitry adapted to apply or inhibit a ventricular tachycardia therapy; and control circuitry coupled to the sensing circuitry and therapy circuitry, the control circuitry adapted to; determine ventricular intervals using the sensed ventricular events; detect a ventricular tachyarrhythmia using the ventricular intervals and predetermined rate zones; start a first time interval in response to the ventricular tachyarrhythmia being detected using a predetermined tachycardia rate zone of the predetermined rate zones; determine whether at least a predetermined percentage of the ventricular intervals during a detection window are fast ventricular intervals in the predetermined tachycardia rate zone; reset the first time interval in response to a determination that the at least the predetermined percentage of the ventricular intervals during the detection window are not the fast ventricular intervals; analyze the cardiac rhythms during the first time interval to assess an origin of the ventricular tachyarrhythmia; and delay or inhibit the ventricular tachycardia therapy at an end of the first time interval if the origin of the ventricular tachyarrhythmia is in an atrium. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification