In addition to its diagnostic utility, the EPS is also widely utilized for the assessment of risk for sudden cardiac death among patients with arrhythmias (e.g., non-sustained ventricular tachycardia), patients with a possible past cardiac arrhythmia event (e.g., syncope), patients with aborted sudden cardiac death or even patients without arrhythmias. The role of EPS in risk stratification of such patient groups is an important issue as the medical community selects methods to prevent sudden cardiac death in the most appropriate and cost-effective way. The sensitivity, specificity and predictive value of EPS are dependent on the clinical presentation, type of abnormality found at EPS and the underlying organic heart disease (Figure 1). In this article, we will review the data regarding the utility of EPS in risk stratification for arrhythmic occurrence and sudden cardiac death in various groups of patients.