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Methods and systems for detecting the presence of T-wave alternans

  • US 7,756,571 B1
  • Filed: 09/16/2005
  • Issued: 07/13/2010
  • Est. Priority Date: 09/16/2005
  • Status: Active Grant
First Claim
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1. In an implantable system, a method for detecting T-wave alternans, comprising:

  • (a) detecting at least one intrinsic premature contraction of the ventricles;

    (b) measuring at least one metric of T-waves in a specified number of beats that follow each detected intrinsic premature contraction of the ventricles; and

    (c) determining if the detected intrinsic premature contraction of the ventricles is immediately preceded by at least a specified number of non-premature contractions of the ventricles and further determining, based on the measured T-wave metrics, whether T-wave alternans are present wherein, if the detected intrinsic premature contraction is not immediately preceded by at least the specified number of non-premature contractions then the T-wave metrics following the detected intrinsic premature contraction are either not measured or not used in determining if T-wave alternans are present.

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