Paroxysmal supraventricular tachycardia (PSVT) are generally benign, but have a substantial impact on quality of life (QoL), increase healthcare resource utilization and are occasionally associated with significant morbidity [1], [2], [3], [4], [5], [6], [7], [8], [9], [10]. Performance of an electrophysiological study (EPS) to establish a definitive diagnosis is considered optional and reserved for patients with documented episodes in whom catheter ablation is anticipated [1]. However, due to its paroxysmal – and often short-lasting – nature, it is not uncommon that patients with episodes clinically suggestive of PSVT fail to obtain electrocardiographic (ECG) documentation of the tachycardia. This frequently results in long delays before effective diagnosis and treatment, especially among women [11,12]. In certain centres it is common practice to perform EPS in these patients with a diagnostic and potentially therapeutic goal, but the adequacy and results of this strategy have not been reported in a wide study.

The aim of this study was to describe the safety, efficacy, and findings of EPS, followed by ablation when appropriate, and subsequent clinical course, in patients with clinically suspected non-documented PSVT.