US 12,390,167 B2
Methods and systems for determining whether R-wave detections should be classified as false due to T-wave oversensing (TWO) or P-wave oversensing (PWO)
Nima Badie, Oakland, CA (US); Wenwen Li, Studio City, CA (US); Fujian Qu, San Jose, CA (US); and Jong Gill, Valencia, CA (US)
Assigned to Pacesetter, Inc., Sylmar, CA (US)
Filed by Pacesetter, Inc., Sylmar, CA (US)
Filed on Apr. 18, 2022, as Appl. No. 17/723,207.
Claims priority of provisional application 63/213,660, filed on Jun. 22, 2021.
Prior Publication US 2022/0401036 A1, Dec. 22, 2022
Int. Cl. A61B 5/00 (2006.01); A61B 5/349 (2021.01); A61B 5/352 (2021.01); A61B 5/353 (2021.01); A61B 5/355 (2021.01)
CPC A61B 5/7221 (2013.01) [A61B 5/349 (2021.01); A61B 5/352 (2021.01); A61B 5/353 (2021.01); A61B 5/355 (2021.01); A61B 5/686 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method for use by an implantable medical device (IMD), the method comprising:
sensing a signal indicative of electrical activity of a patient's heart;
detecting R-waves based on comparisons of the signal indicative of electrical activity of the patient's heart, or samples thereof, to an R-wave detection threshold;
detecting an arrhythmic episode based on the R-wave detections;
in response to the arrhythmic episode detection, for each R-wave detection of at least some of the R-wave detections in a window leading up to the arrhythmic episode detection, determining whether the R-wave detection should be classified as a false R-wave detection due to T-wave oversensing (TWO) or P-wave oversensing (PWO) by:
comparing a specific morphological characteristic associated with the R-wave detection to the specific morphological characteristic associated with each R-wave detection in a first set of earlier detected R-wave detections including R-wave detections that were one, two, and three R-wave detections earlier to thereby determine whether first TWO or PWO morphological criteria are met, and in a second set of earlier detected R-wave detections including R-wave detections that were two, three, and four R-wave detections earlier to thereby determine whether second TWO or PWO morphological criteria are met, wherein the second set differs from the first set but has some overlap with the first set; and
classifying the R-wave detection as a false R-wave detection based on whether one of the first or second TWO or PWO morphological criteria being met; and
based on an extent of the R-wave detections classified as being false R-wave detections due to TWO or PWO, performing at least one of: selectively preventing or aborting delivery of therapy by the IMD intended to treat the arrhythmic episode; selectively preventing transmission by the IMD to an external device of data corresponding to the arrhythmic episode that can be used for diagnostic purposes; or selectively adjusting at least one parameter of the R-wave detection threshold that can be used by the IMD for detecting further R-waves and thereby detecting a further arrhythmic episode.