Patent ID: 8577449
Filing Date: 2013-11-05
Classification: A61B,A61N

Abstract:
1. A method for ischemia detection comprising: obtaining at least one IEGM signal representative of cardiac behavior of a patient over a period of time; calculating a derivative signal of the IEGM signal; identifying a R-wave in the derivative signal or in the IEGM signal; analyzing said derivative signal data following said identified R-wave so as to find portions of said derivative signal comprising samples having lower values than a predetermined threshold; determining a portion of said derivative signal including samples having lower values than said threshold to correspond to a ST window for that cardiac cycle if that portion fulfills predetermined requirements; creating a reference ST window based on a number of said determined ST windows; and detecting ischemia by comparing IEGM data in said reference ST window with current IEGM data from a segment of the IEGM signal corresponding to the reference ST window.