Patent ID: 7983742

Claim:
A method for analyzing electrocardiograph signals from a plurality of ECG leads comprising the steps of: sensing analog fluctuations in voltage simultaneously from the plurality of ECG leads, the fluctuations in voltage resulting from electrical activity of a heart and defining a plurality of analog signals; converting such signals having an analog value to digital values corresponding substantially to the analog value of the signals; analyzing the digital values of the record in real-time by: identifying a time of each R wave of a heartbeat; defining individual signal averaged templates for the T wave and the QRS wave for a series of heartbeats by segmenting each heartbeat of the series of heartbeats at: i. the beginning and the end of the QRS wave; and ii. the beginning and the end of the T wave; utilizing the defined individual templates to determine alteration values for individual T waves and QRS waves of an individual heartbeat, the alteration values comprising shifts in time of the T wave and QRS wave as error functions for the heartbeat; and assessing changes in QT interval for each heartbeat using the T wave template, the QRS wave template, and the series of heartbeats to determine beat-to-beat variability of the QT intervals of the heartbeats.