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An implantable medical device is directed to techniques for applying overdrive pacing to one or both atria following termination of an AF episode, to prevent a recurrent AF episode. The implantable medical device such as a pacemaker applies overdrive pacing according to overdrive pacing parameters,

An implantable medical device is directed to techniques for applying overdrive pacing to one or both atria following termination of an AF episode, to prevent a recurrent AF episode. The implantable medical device such as a pacemaker applies overdrive pacing according to overdrive pacing parameters, and sets the parameters as a function of the response of the patient to overdrive pacing. The parameters may be adjusted upward or downward, so that overdrive pacing may be applied effectively but not over-applied.

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What is claimed is: 1. A method comprising: controlling a pulse generator to deliver overdrive pacing therapy to an atrium via an electrode disposed proximate to the atrium of a heart according to an overdrive pacing parameter following an episode of atrial fibrillation; monitoring for an episode o

What is claimed is: 1. A method comprising: controlling a pulse generator to deliver overdrive pacing therapy to an atrium via an electrode disposed proximate to the atrium of a heart according to an overdrive pacing parameter following an episode of atrial fibrillation; monitoring for an episode of recurrent atrial fibrillation; receiving a threshold via a telemetry unit; computing a measure of episodes of atrial fibrillation in an evaluation period that are followed by recurrent episodes of atrial fibrillation; comparing the measure to the threshold; and setting the overdrive pacing parameter as a function of the comparing. 2. The method of claim 1, wherein the overdrive pacing parameter comprises at least one of an overdrive pacing rate, an overdrive pacing duration, and a waiting period preceding the overdrive pacing duration. 3. The method of claim 1, further comprising detecting a termination of the first episode of atrial fibrillation prior to applying the overdrive pacing therapy. 4. The method of claim 3, further comprising waiting for a waiting period between the termination of the first episode of atrial fibrillation and applying the overdrive pacing therapy. 5. The method of claim 1, further comprising: administering a shock therapy to the atrium following a detection of the first episode of atrial fibrillation; and applying the overdrive pacing therapy immediately after administering the shock therapy. 6. The method of claim 1, further comprising monitoring for the occurrence of an episode of recurrent atrial fibrillation while applying the overdrive pacing therapy. 7. The method of claim 6, further comprising: applying the overdrive pacing therapy at an overdrive pacing rate; detecting an episode of recurrent atrial fibrillation while applying the overdrive pacing therapy; and increasing the overdrive pacing rate. 8. The method of claim 1, further comprising monitoring for the occurrence of an episode of recurrent atrial fibrillation in a monitoring period after applying the overdrive pacing therapy. 9. The method of claim 8, further comprising: applying the overdrive pacing therapy for an overdrive pacing duration; detecting an episode of recurrent atrial fibrillation in the monitoring period; and increasing the overdrive pacing duration. 10. The method of claim 1, further comprising: applying the overdrive pacing therapy at an overdrive pacing rate for an overdrive pacing duration; and decreasing at least one of the overdrive pacing rate and the overdrive pacing duration. 11. A computer-readable medium comprising instructions for causing a programmable processor to: control a pulse generator to deliver overdrive pacing therapy to an atrium via an electrode disposed proximate to the atrium of the heart according to an overdrive pacing parameter following a first episode of atrial fibrillation; monitor for an episode of recurrent atrial fibrillation; receive a threshold via a telemetry unit; compute a measure of episodes of atrial fibrillation in an evaluation period that are followed by recurrent episodes of atrial fibrillation; compare the measure to the threshold; and set the overdrive pacing parameter as a function of the comparing. 12. The medium of claim 11, wherein the overdrive pacing parameter comprises at least one of an overdrive pacing rate, an overdrive pacing duration, and a waiting period preceding the overdrive pacing duration. 13. The medium of claim 11, the instructions further causing the processor to detect a termination of the first episode of atrial fibrillation prior to applying the overdrive pacing therapy. 14. The medium of claim 13, the instructions further causing the processor to wait for a waiting period between the termination of the first episode of atrial fibrillation and applying the overdrive pacing therapy. 15. The medium of claim 11, the instructions further causing the processor to: administer a shock therapy to the atrium following a detection of the first episode of atrial fibrillation; and apply the overdrive pacing therapy immediately after administering the shock therapy. 16. The medium of claim 11, the instructions further causing the processor to monitor for the occurrence of an episode of recurrent atrial fibrillation while applying the overdrive pacing therapy. 17. The medium of claim 16, the instructions further causing the processor to: apply the overdrive pacing therapy at an overdrive pacing rate; detect an episode of recurrent atrial fibrillation while applying the overdrive pacing therapy; and increase the overdrive pacing rate. 18. The medium of claim 11, the instructions further causing the processor to monitor for the occurrence of an episode of recurrent atrial fibrillation in a monitoring period after applying the overdrive pacing therapy. 19. The medium of claim 18, the instructions further causing the processor to: apply the overdrive pacing therapy for an overdrive pacing duration; detect an episode of recurrent atrial fibrillation in the monitoring period; and increase the overdrive pacing duration. 20. The medium of claim 11, the instructions further causing the processor to: apply the overdrive pacing therapy at an overdrive pacing rate for an overdrive pacing duration; and decrease at least one of the overdrive pacing rate and the overdrive pacing duration. 21. An implantable medical device comprising: at least one electrode disposed proximate to an atrium of a heart; a pulse generator coupled to the electrode; a processor to control the pulse generator to deliver overdrive pacing therapy to the atrium via the electrode according to an overdrive pacing parameter following an episode of atrial fibrillation, monitor for an episode of recurrent atrial fibrillation, and set the overdrive pacing parameter as a function of the monitoring; and a telemetry unit to receive a threshold, wherein the processor computes a measure of episodes of atrial fibrillation in an evaluation period that are followed by recurrent episodes of atrial fibrillation, compares the measure to a threshold and sets an overdrive pacing parameter as a function of the comparison. 22. The device of claim 21, further comprising sensing circuitry to detect the episode of atrial fibrillation and monitor for the episode of recurrent atrial fibrillation. 23. The device of claim 21, wherein the device operates in a plurality of pacing modes, and wherein the device selects a pacing mode as a function of a detected episode of atrial fibrillation.