Patent ID: RE43569

Claim:
A method of determining an ischemic event, said method comprising the steps of: monitoring and storing an initial electrocardiogram vector signal (x 1 , y 1 , z 1 ) of a known non-ischemic condition over the QRS, ST and T wave intervals; calculating and storing a J-point of the vector signal (x 1 , y 1 , z 1 ) and a maximum magnitude of a signal level over said T wave interval; monitoring a subsequent electrocardiogram vector signal (x 2 , y 2 , z 2 ) over the QRS, ST and T wave intervals; measuring the magnitude (Mag.) of the vector difference between a subsequent vector signal (x 2 , y 2 , z 2 ) and the initial vector signal (x 1 , y 1 , z 1 ); measuring the angle (Ang.) difference between a subsequent vector (x 2 , y 2 , z 2 ) and said initial vector signal (x 1 , y 1 , z 1 ); regressing a line from points about 25 milliseconds prior to the J point and about 60 milliseconds after the J-point and determining the slope of the regression line and the deviation of the angle difference of said regression line; regressing a line from points about 100 milliseconds prior to said maximum magnitude of the signal level over said T wave interval and determining the slope of the regressing line and the deviation of the angle difference of said regression line; and comparing said slope and deviation of said lines from said J point and said T wave interval to a set of known values to determine the presence of an ischemic event.