Signal averaged ECG (SAECG)

A signal averaged ECG is a diagnostic test that averages multiple QRS complexes over a 10-minute time period, or at least 250 QRS complexes in order to see minute changes in the electrical activity that is not apparent on the standard 12-lead ECG.

“Early afterdepolarizations” or “late potentials” may be seen after the QRS complex and is thought to increase the risk of ventricular arrhythmias, although this is controversial. These are also prominent in patients with arrhythmogenic right ventricular dysplasia (ARVD).