Patient characteristics
Six prospective patients from 2 centers were included. The mean age was 40.6 ± 13.9 years; five of the six patients were female, 100% of patients reported heart palpitations, and 66% reported dizziness (Table 1). No patients presented with POTS and 2 patients had VVS. Other prevalent diseases included systemic lupus erythematosus (n: 1, 16%), fibromyalgia (16,6%) and anxiety disorder (16,6%). No patients reported other chronic diseases such as hypertension, diabetes or heart failure. 3 patients had undergone previous ablations of other supraventricular tachycardias (atrioventricular accessory pathway, premature atrial contractions and AVNRT). Finally, two patients had undergone previous SNM using the conventional method of high doses of isoproterenol and ablation from the site of maximum precocity extending laterally. Before the procedure, the average HR on a 24-h Holter was 93.2 ±7.9 bpm. HR during the first stage of a stress test using a standard Bruce protocol was 150 ±70 bpm (Table 1).