Patent ID: 8126539

Claim:
A method, comprising: sensing a cardiac electrogram (EGM) signal comprising a plurality of T-wave signals; selecting a pair of T-wave signals from the plurality of T-wave signals, the selected pair comprising a first T-wave signal and a second T-wave signal occurring consecutively after the first T-wave signal; identifying a minimum peak of each of the first and second T-wave signals; determining a first amplitude and a second amplitude associated with the first T-wave signal, the second amplitude being the minimum peak amplitude of the first T-wave signal; determining a first amplitude and a second amplitude associated with the second T-wave signal, the second amplitude associated with the second T-wave signal being the minimum peak amplitude of the second T-wave signal; determining a first difference between the first amplitude associated with the first T-wave signal and the first amplitude associated with the second T-wave signal; determining a second difference between the second amplitude associated with the first T-wave signal and the second amplitude associated with the second T-wave signal; and computing a T-wave alternans metric in response to the first difference and the second difference.