US 11,937,948 B2
Identification of false asystole detection
Ya-Jian Cheng, Lino Lakes, MN (US); and Jerry D. Reiland, Coon Rapids, MN (US)
Assigned to Medtronic, Inc., Minneapolis, MN (US)
Filed by Medtronic, Inc., Minneapolis, MN (US)
Filed on Jul. 26, 2021, as Appl. No. 17/385,481.
Application 17/385,481 is a continuation of application No. 16/401,553, filed on May 2, 2019, granted, now 11,071,500.
Prior Publication US 2021/0345969 A1, Nov. 11, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. A61B 5/00 (2006.01); A61B 5/287 (2021.01); A61B 5/364 (2021.01)
CPC A61B 5/7221 (2013.01) [A61B 5/287 (2021.01); A61B 5/364 (2021.01)] 21 Claims
OG exemplary drawing
 
1. A medical device comprising:
a plurality of electrodes configured to sense a cardiac electrogram of a patient; and
processing circuitry configured to:
determine that an asystole detection criterion is satisfied based on not identifying a cardiac depolarization in the cardiac electrogram during a time interval;
based on the determination that the asystole detection is satisfied, determine whether one or more false asystole detection criteria are satisfied based on the cardiac electrogram signal; and
withhold an indication of an asystole episode for the patient based on a determination that at least one of the one or more false asystole detection criteria is satisfied,
wherein the one or more false asystole detection criteria comprises a reduced amplitude threshold criterion for detecting cardiac depolarizations in the cardiac electrogram,
wherein, to determine that the reduced amplitude threshold criterion is satisfied, the processing circuitry is configured to:
identify a plurality of cardiac depolarizations occurring in the cardiac electrogram preceding the time interval;
determine an amplitude for each cardiac depolarization of the plurality of identified cardiac depolarizations; and
determine a reduced amplitude threshold based on the determined amplitudes of the plurality of identified cardiac depolarizations.