METHOD AND APPARATUS FOR TREATING IRREGULAR VENTRICULAR CONTRACTIONS SUCH AS DURING ATRIAL ARRHYTHMIA
First Claim
1. A system comprising:
- a ventricular sensing circuit configured to sense ventricular beats;
a controller, coupled to the ventricular sensing circuit, wherein the controller is configured to obtain V-V intervals between the ventricular beats and to compute a first indicated pacing interval by summing a first addend that includes a most recent V-V interval duration and a second addend that includes a stored previously-computed V-V interval duration;
a ventricular therapy circuit, coupled to the controller, configured to provide pacing therapy using the first indicated pacing interval; and
wherein the controller is configured to decrease the first pacing interval following an intrinsic ventricular beat.
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Abstract
A cardiac rhythm management system is capable of treating irregular ventricular heart contractions, such as during atrial tachyarrhythmias such as atrial fibrillation. A first indicated pacing interval is computed based at least partially on a most recent V-V interval duration between ventricular beats and a previous value of the first indicated pacing interval. Pacing therapy is provided based on either the first indicated pacing interval or also based on a second indicated pacing interval, such as a sensor-indicated pacing interval. A weighted averager such as an infinite impulse response (IIR) filter adjusts the first indicated pacing interval for sensed beats and differently adjusts the first indicated pacing interval for paced beats. The system regularizes ventricular rhythms by pacing the ventricle, but inhibits pacing when the ventricular rhythms are stable.
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Citations
23 Claims
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1. A system comprising:
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a ventricular sensing circuit configured to sense ventricular beats;
a controller, coupled to the ventricular sensing circuit, wherein the controller is configured to obtain V-V intervals between the ventricular beats and to compute a first indicated pacing interval by summing a first addend that includes a most recent V-V interval duration and a second addend that includes a stored previously-computed V-V interval duration;
a ventricular therapy circuit, coupled to the controller, configured to provide pacing therapy using the first indicated pacing interval; and
wherein the controller is configured to decrease the first pacing interval following an intrinsic ventricular beat. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system comprising:
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means for sensing ventricular beats;
means for obtaining V-V intervals between the ventricular beats;
means for computing a first indicated pacing interval by summing a first addend with a second addend, wherein the first addend includes a most recent V-V interval duration and the second addend includes a stored previously-computed V-V interval duration;
means for providing pacing therapy using the first indicated pacing interval; and
means for decreasing the first pacing interval following an intrinsic ventricular beat.
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13. A method comprising:
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sensing ventricular beats;
obtaining V-V intervals between the ventricular beats;
computing a first indicated pacing interval by summing a first addend with a second addend, wherein the first addend includes a most recent V-V interval duration and the second addend includes a stored previously-computed V-V interval duration;
providing pacing therapy using the first indicated pacing interval; and
decreasing the first pacing interval following an intrinsic ventricular beat. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification