Patent Document ID: 20160325106
Application ID: 14705010
Patent Flag: 0

Claim One:
1. A method performed by a medical device, comprising: receiving a cardiac electrical signal from a patient's heart via a plurality of extracardiac electrode electrically coupled to the medical device; setting a first signal analysis segment of the cardiac electrical signal; analyzing the first signal analysis segment to determine if shockable rhythm classification criteria are met for the first signal analysis segment; setting a plurality of T-wave oversensing (TWOS) analysis windows; analyzing cardiac events of the cardiac electrical signal to classify each TWOS analysis window of the plurality of TWOS analysis windows as one of TWOS and no TWOS, each TWOS analysis window being classified as TWOS when cardiac events during the TWOS analysis window satisfy TWOS criteria and classified as no TWOS when the cardiac events during the TWOS analysis window do not satisfy TWOS criteria; determining that TWOS detection criteria are met for the first signal analysis segment when a predetermined number of the plurality of TWOS analysis windows are classified as TWOS; and classifying the first signal analysis segment as non-shockable in response to determining that the TWOS detection criteria are met.