Patent Document ID: 20140046396
Application ID: 14058495
Patent Flag: 0

Claim One:
1. A method of operation in an implantable cardiac stimulus (ICS) system comprising a canister housing operational circuitry for the ICS system, the canister having a canister electrode disposed thereon, and a lead having at least a first lead electrode disposed thereon, the canister electrode and the first lead electrode electrically coupled to the operational circuitry; the method comprising: detecting cardiac electrical events occurring within the patient; constructing event representations for the detected electrical events; calculating a cardiac rate using a set of the detected electrical events; comparing the event representations to a template representative of a known cardiac state to establish a set of correlations; analyzing the set of correlations for one of the following: a) a short pattern calling for a set of 3 or more consecutive correlations to include a High-Low-High pattern around first boundaries, or b) a long pattern calling for a set of 5 or more consecutive correlations to include High-Low-High-Low-High correlations around second boundaries, wherein the first boundaries require stronger correlation for “High” than the second boundaries; if either the short pattern or the long pattern is identified, characterizing one or more detected events as overdetections and modifying the calculated cardiac rate; determining whether a likely cardiac arrhythmia is occurring and, if so, determining whether stimulus is needed; and if stimulus is needed, delivering electrical stimulus to the patient from the ICS system.