Patent ID: 7725172
Filing Date: 2010-05-25
Classification: A61N

Abstract:
1. An implantable medical system, comprising: an implantable medical device having a substantially hermetic housing; a detecting means for detecting QT interval time values, disposed within the housing; a memory means for storing said detected time values in a queue; a transformation array program containing elements providing for operating on n of said timings, coupled to said detecting circuit, wherein said transform array program includes pattern factors in the form of alternating positive and negative factors and wherein n is a positive integer; a control means coupled to said memory means and said transformation array for multiplying said stored time values by said positive and negative pattern factors and for producing a value indicative of the degree of T-wave alternans using the multiplications; and a threshold circuit operating on said indicative value and detecting T-wave alternans as a function of said indicative value.