“…16,17 There are retrospective studies in which patients with supraventricular tachycardia (SVT) were asked to grade their HRQOL after RFA and compare it with how they recall feeling before treatment. 18,19 However, with that methodology there is an obvious risk for bias recall, because patients' rating of HRQOL would be influenced by the ablation procedure, the outcome of the RFA, and the time the assessment is made. HRQOL preferably should be evaluated prospectively.…”