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

• US 20070123941A1
• Filed: 11/28/2006
• Published: 05/31/2007
• 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 8,532,772 B2
• Time in Patent Office: Days
• US Class Current: 607/6
• 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 method and system of 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, and determines, in response to the transmitted sensing data, whether one of the sensed ventricular events and the sensed atrial events is initiating conduction of a heart associated with the stored sensing data.

Claims

1. A method of 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; and

determining, in response to the transmitted sensing data, whether one of the sensed ventricular events and the sensed atrial events is initiating conduction of a heart associated with the stored sensing data.

2. The method of claim 1, further comprising:

identifying a spatial reference point; and

generating a window of sensed ventricular events for determining whether one of the sensed ventricular events and the sensed atrial events is initiating conduction of the heart in response to the spatial reference point.

3. The method of claim 2, wherein identifying a spatial reference point comprises determining, starting with a last ventricular sense event associated with a cardiac event being detected, when a predetermined number of sequential adjacent intervals occurring prior to the last ventricular sense event are greater than an onset threshold.

4. The method of claim 3, further comprising:

determining a first median of first sensing data of the plurality of transmitted stored sensing data occurring just prior to the cardiac event being detected;

determining a second median of second sensing data of the plurality of transmitted stored sensing data occurring prior to a number of intervals to detection associated with the cardiac event being detected; and

determining a difference between the first median and the second median, wherein an abrupt onset is determined in response to the difference being greater than a predetermined threshold, wherein the onset threshold is set as a sum of the first median and a portion of the determined difference.

5. The method of claim 2, further comprising determining a number of sensed atrial events between each adjacent pairs of the sensed ventricular events in the window, wherein the sensed atrial events are determined to be initiating the conduction in response to no sensed atrial events occurring between more than one of the adjacent pairs and only one sensed atrial event occurring between each of the other of the adjacent pairs of the sensed ventricular events in the window, and the sensed ventricular events are determined to be initiating conduction in response to no sensed atrial events occurring between only one of the adjacent pairs and only one sensed atrial event occurring between each of the other of the adjacent pairs of the sensed ventricular events in the window.

6. A system for 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, and whether one of the sensed ventricular events and the sensed atrial events is initiating conduction of a heart associated with the stored sensing data.

7. The system of claim 6, wherein the access device identifies a spatial reference point, and generates a window of sensed ventricular events for determining whether one of the sensed ventricular events and the sensed atrial events is initiating conduction of the heart in response to the spatial reference point.

8. The system of claim 7, wherein the access device identifies a spatial reference point by determining, starting with a last ventricular sense event associated with a cardiac event being detected, when a predetermined number of sequential adjacent intervals occurring prior to the last ventricular sense event are greater than an onset threshold.

9. The system of claim 8, wherein the access device determines a first median of first sensing data of the plurality of transmitted stored sensing data occurring just prior to the cardiac event being detected, a second median of second sensing data of the plurality of transmitted stored sensing data occurring prior to a number of intervals to detection associated with the cardiac event being detected, and a difference between the first median and the second median, wherein an abrupt onset is determined in response to the difference being greater than a predetermined threshold, and wherein the onset threshold is set as a sum of the first median and a portion of the determined difference.

10. The system of claim 7, wherein the access device determines a number of sensed atrial events between each adjacent pairs of the sensed ventricular events in the window, wherein the sensed atrial events are determined to be initiating the conduction in response to no sensed atrial events occurring between more than one of the adjacent pairs and only one sensed atrial event occurring between each of the other of the adjacent pairs of the sensed ventricular events in the window, and the sensed ventricular events are determined to be initiating conduction in response to no sensed atrial events occurring between only one of the adjacent pairs and only one sensed atrial event occurring between each of the other of the adjacent pairs of the sensed ventricular events in the window.