METHOD AND APPARATUS FOR POST-PROCESSING OF EPISODES DETECTED BY A MEDICAL DEVICE

• US 20070135864A1
• Filed: 11/28/2006
• Published: 06/14/2007
• Est. Priority Date: 11/28/2005
• Status: Active Grant

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Brown, Mark, Patel, Amisha, Gunderson, Bruce
• Granted Patent: US 8,073,537 B2
• Time in Patent Office: Days
• US Class Current: 607/59
• CPC Class Codes: A61B 2560/0271 using a remote monitoring unit
• CPC Class Codes: A61B 5/0006 ECG or EEG signals
• CPC Class Codes: A61B 5/0031 Implanted circuitry
• CPC Class Codes: A61B 5/349 Detecting specific parameters of the electrocardiograph cycle
• CPC Class Codes: A61B 5/35 by template matching
• CPC Class Codes: A61N 1/368 comprising more than one electrode co-operating with different heart regions A61N1/3622, A61N1/3627 take precedence
• CPC Class Codes: A61N 1/3702 Physiological parameters A61N1/365 takes precedence; evoked response A61N1/371
• CPC Class Codes: A61N 1/3706 Pacemaker parameters stimulation threshold A61N1/371
• CPC Class Codes: A61N 1/37211 Means for communicating with stimulators
• CPC Class Codes: A61N 1/3925 Monitoring; Protecting
• CPC Class Codes: A61N 1/39622 Pacing therapy
• CPC Class Codes: G16H 40/67 for remote operation

Abstract

A system and method for determining oversensing during post-processing of sensing data generated by a medical device that includes transmitting a plurality of stored sensing data generated by the medical device to an access device, the stored sensing data including sensed atrial events and sensed ventricular events. The access device determines, in response to the transmitted data, instances where the medical device identified a cardiac event being detected in response to the sensing data, identifies and removes suspected far-field R-waves, and determines whether a signal including the removed suspected far-field R-waves is regular.

Claims

1. A method of determining oversensing during post-processing of sensing data generated by a medical device, comprising:

transmitting a plurality of stored sensing data generated by the medical device to an access device, the stored sensing data including sensed atrial events and sensed ventricular events;

determining, in response to the transmitted data, instances where the medical device identified a cardiac event being detected in response to the sensing data;

identifying suspected far-field R-waves;

removing the suspected far-field R-waves; and

determining whether a signal including the removed suspected far-field R-waves is regular.

2. The method of claim 1, wherein the determining whether a signal including the removed suspected far-field R-waves is regular comprises determining, in response to the transmitted data, whether a predetermined number of intervals, starting with and working backward in time from an interval corresponding to detection of the cardiac event by the medical device, have approximately equal cycle lengths.

3. The method of claim 2, further comprising:

inserting the removed suspected far-field R-waves;

generating a template corresponding to morphologies of a predetermined number of intervals adjacent to the inserted far-field R-waves; and

determining whether the morphology a far-field R-wave of the inserted suspected far-field R-waves has a predetermined correlation with one of the generated templates corresponding to an interval of the predetermined number of intervals that is a non-suspected and a non-confirmed beat.

4. A system for determining oversensing during post-processing of sensing data associated with identification of a cardiac event, comprising:

a medical device generating and storing a plurality of sensing data, the stored sensing data including sensed atrial events and sensed ventricular events;

an access device located externally from the medical device; and

an interface for transmitting the stored sensing data from the medical device to the access device, wherein the access device determines, in response to the transmitted data, instances where the medical device identified a cardiac event being detected in response to the sensing data, identifies suspected far-field R-waves, removes the suspected far-field R-waves, and determines whether a signal including the removed suspected far-field R-waves is regular.

5. The system of claim 4, wherein the access device determines, in response to the transmitted data, whether a predetermined number of intervals, starting with and working backward in time from an interval corresponding to detection of the cardiac event by the medical device, have approximately equal cycle lengths.

6. The system of claim 5, wherein the access device inserts the removed suspected far-field R-waves, generates a template corresponding to morphologies of a predetermined number of intervals adjacent to the inserted far-field R-waves, and determines whether the morphology a far-field R-wave of the inserted suspected far-field R-waves has a predetermined correlation with one of the generated templates corresponding to an interval of the predetermined number of intervals that is a non-suspected and a non-confirmed beat.