The Edan T-wave Alternans (TWA) function is an advanced optional diagnostic software module designed for the Edan Holter Analysis System. This specialized feature integrates directly into the Holter software to detect microvolt-level fluctuations in the T-wave of an ECG, providing clinicians with critical risk-stratification data for ventricular arrhythmias and sudden cardiac death. By extending the utility of standard 3-channel and 12-channel Holter recordings, this algorithm enables comprehensive, non-invasive cardiac evaluation during long-term patient monitoring.