Patent ID: 8849381

Claim:
A system for assessing a cardiac condition of a subject, the system comprising: electronic circuitry configured to record a plurality N of electrocardiographic signals from the subject to generate an ECG (electrocardiogram); and a processor configured to compute estimates of a plurality of variables from the recorded signals that contain information about the cardiac condition of the subject using at least one RMS (root-mean-square) magnitude function to compute RMS variables that contain information about the cardiac condition of the subject including fiducial marks providing, on a beat by beat basis, estimates of: (a) the mean ventricular depolarization time, (b) the mean ventricular repolarization time, (c) the mean ventricular action potential duration, and (d) the ranges of both depolarization and repolarization times; wherein a mathematical formulation of the RMS magnitude function comprises: E R ⁢ ⁢ MS ⁡ ( t ) = 1 N ⁢ ∑ e i 2 ⁡ ( t ) where E RMS (t) represents the RMS magnitude function at a time t; and e i (t) represents the i-th electrocardiographic signal recorded at the time t.