Cardiac rhythm management system promoting a trial pacing
First Claim
1. A cardiac rhythm management system, including:
- an atrial sensing circuit;
a controller, the controller including;
an A—
A interval timer;
a first register, for storing a first indicated pacing interval;
a filter, updating the first indicated pacing interval based on the A—
A interval timer and the first register; and
an atrial therapy circuit, providing pacing therapy based at least partially on the first indicated pacing interval.
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Accused Products
Abstract
A cardiac rhythm management system includes an atrial pacing preference (APP) filter for promoting atrial pacing. The APP filter includes an infinite impulse response (IIR) or other filter that controls the timing of delivery of atrial pacing pulses. The atrial pacing pulses are delivered at an APP-indicated pacing rate that is typically at a small amount above the intrinsic atrial heart rate. For sensed beats, the APP indicated rate is increased until it becomes slightly faster than the intrinsic atrial heart rate. The APP-indicated pacing rate is then gradually decreased to search for the underlying intrinsic atrial heart rate. Then, after a sensed atrial beat, the APP filter again increases the pacing rate until it becomes faster than the intrinsic atrial rate by a small amount. As a result, most atrial heart beats are paced, rather than sensed. This decreases the likelihood of the occurrence of an atrial tachyarrhythima, such as atrial fibrillation. The decreased likelihood of atrial tachyarrhythmia, in turn, decreases the likelihood of inducing a ventricular arrhythmia, either as a result of the atrial tachyarrhythmia, or as the result of delivering a defibrillation shock to treat the atrial tachyarrhythmia.
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Citations
26 Claims
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1. A cardiac rhythm management system, including:
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an atrial sensing circuit;
a controller, the controller including;
an A—
A interval timer;
a first register, for storing a first indicated pacing interval;
a filter, updating the first indicated pacing interval based on the A—
A interval timer and the first register; and
an atrial therapy circuit, providing pacing therapy based at least partially on the first indicated pacing interval. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An implantable cardiac rhythm management device, including:
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an atrial sensing circuit;
an atrial therapy circuit, providing atrial pacing therapy based on a first indicated pacing interval;
a controller, the controller including;
an A—
A interval timer;
a first register, for storing the first indicated pacing interval; and
an infinite impulse response (IIR) filter that updates the first indicated pacing interval (Tn) according to;
Tn=A·
AAn+B·
Tn−
1, if AAn is concluded by an intrinsic beat, otherwise is updated according to Tn=C·
AAn+D·
Tn−
1, if AAn is concluded by a paced beat, where A, B, C and D are coefficients, and AAn is the A—
A interval duration provided by the A—
A interval timer, and Tn−
1 is the previous value of the first indicated pacing interval.- View Dependent Claims (22, 23, 24, 25, 26)
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Specification