Identification of oversensing using sinus R-wave template

• US 20040230233A1
• Filed: 05/13/2003
• Published: 11/18/2004
• Est. Priority Date: 05/13/2003
• Status: Active Grant

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Gunderson, Bruce D., Jeffrey, Gillberg M., Wilcox, Jay M.
• Granted Patent: US 7,167,747 B2
• Time in Patent Office: Days
• US Class Current: 607/9
• CPC Class Codes: A61N 1/3622 comprising two or more electrodes co-operating with different heart regions
• CPC Class Codes: A61N 1/3704 Circuits specially adapted therefor, e.g. for sensitivity control

Abstract

A method and apparatus delivering therapy in an implantable medical device that includes sensing a first cardiac signal and detecting cardiac events via a first electrode configuration, determining the presence of an episode requiring therapy in response to the detected cardiac events, sensing a second cardiac signal via a second electrode configuration, comparing, in response to an episode being present, portions of the second cardiac signal corresponding to the detected cardiac events with a predetermined template, and determining whether to deliver therapy in response to the comparing.

Claims

1. A method for delivering therapy in an implantable medical device, comprising:

sensing a first cardiac signal and detecting cardiac events via a first electrode configuration;

determining the presence of an episode requiring therapy in response to the detected cardiac events;

sensing a second cardiac signal via a second electrode configuration;

comparing, in response to an episode being present, portions of the second cardiac signal corresponding to the detected cardiac events with a predetermined template; and

determining whether to deliver therapy in response to the comparing.

2. The method of claim 1, wherein the comparing further comprises:

determining whether RR-intervals corresponding to the second cardiac signal are less than a predetermined threshold rate;

determining whether a portion of the second cardiac signal corresponding to a predetermined time window matches a predetermined match template; and

determining whether the portion of the second cardiac signal is below a predetermined baseline threshold indicative of an isoelectric baseline.

3. The method of claim 2, wherein the determining whether to deliver therapy further comprises inhibiting therapy delivery in response to RR-intervals corresponding to the second cardiac signal being less than the predetermined threshold rate, the portion of the second cardiac signal corresponding to the predetermined time window matching the predetermined match template, and the portion of the second cardiac signal being below the predetermined baseline threshold.

4. The method of claim 2, wherein the determining whether to deliver therapy further comprises inhibiting therapy delivery in response to more than one of RR-intervals corresponding to the second cardiac signal being less than the predetermined threshold rate, the portion of the second cardiac signal corresponding to the predetermined time window matching the predetermined match template, and the portion of the second cardiac signal being below the predetermined baseline threshold.

5. The method of claim 1, wherein the first cardiac signal is a near-field signal and the second cardiac signal is a far-field signal.

6. The method of claim 1, further comprising comparing portions of the second cardiac signal corresponding to events of the detected cardiac events occurring subsequent to the episode with a predetermined template, wherein determining whether to deliver therapy includes delivering therapy in response to the detected cardiac events occurring subsequent to the episode.

7. An implantable medical device for delivering therapy to a patient, comprising:

means for sensing a first cardiac signal and detecting cardiac events via a first electrode configuration;

means for determining the presence of an episode requiring therapy in response to the detected cardiac events;

means for sensing a second cardiac signal via a second electrode configuration;

means for comparing, in response to an episode being present, portions of the second cardiac signal corresponding to the detected cardiac events with a predetermined template; and

means for determining whether to deliver therapy in response to the comparing.

8. The device of claim 7, wherein the means for comparing further comprises:

means for determining whether RR-intervals corresponding to the second cardiac signal are less than a predetermined threshold rate;

means for determining whether a portion of the second cardiac signal corresponding to a predetermined time window matches a predetermined match template; and

means for determining whether the portion of the second cardiac signal is below a predetermined baseline threshold indicative of an isoelectric baseline.

9. The device of claim 8, wherein the means determining whether to deliver therapy inhibits therapy delivery in response to RR-intervals corresponding to the second cardiac signal being less than the predetermined threshold rate, the portion of the second cardiac signal corresponding to the predetermined time window matching the predetermined match template, and the portion of the second cardiac signal being below the predetermined baseline threshold.

10. The device of claim 8, wherein the means for determining whether to deliver therapy inhibits therapy delivery in response to more than one of RR-intervals corresponding to the second cardiac signal being less than the predetermined threshold rate, the portion of the second cardiac signal corresponding to the predetermined time window matching the predetermined match template, and the portion of the second cardiac signal being below the predetermined baseline threshold.

11. The device of claim 7, wherein the first cardiac signal is a near-field signal and the second cardiac signal is a far-field signal.

12. The device of claim 7, further comprising means for comparing portions of the second cardiac signal corresponding to events of the detected cardiac events occurring subsequent to the episode with a predetermined template, wherein the means for determining whether to deliver therapy delivers therapy in response to the detected cardiac events occurring subsequent to the episode.