Abstract

This study explores the feasibility and safety of radiofrequency ablation of paroxysmal supraventricular tachycardia (PSVT) under EnSite NavX mapping guidance. Radiofrequency ablation was performed on 46 young patients (age range of 14 to 32 years; mean age of 22±3.5 years) with PSVT, including atrioventricular nodal re-entrant tachycardia, atrioventricular re-entrant tachycardia, atrial flutter, and atrial tachycardia. Subjects were randomly divided into an EnSite NavX mapping guidance group (n = 23) and a conventional X-ray fluoroscopy group (n = 23). There was no significant difference in age between the two groups (mean ages of 19.0±3.7 and 19.4±4.1 years; P = 0.605). All procedures yielded immediate success without severe complications. No significant difference between surgical time of both groups were found (mean time of 76.5±22.4 and 74.8±21.3 minutes, P = 0.776). Compared with the conventional X-ray fluoroscopy group, the X-ray exposure time of the EnSite NavX group was less (mean exposure of 20.7±43.4 and 339.3±187.8 s, P = 0.000). Among those in the EnSite NavX group, 78.3% (18/23) were not irradiated by X-ray. Radiofrequency ablation of PSVT under the guidance of EnSite NavX and conventional X-ray fluoroscopy are equally effective and safe. The utilization of EnSite NavX notably reduces surgical X-ray exposure time.

Key word: Radiofrequency ablation, supraventricular tachycardia, EnSite NavX mapping system, near-zero fluoroscopy.

Abbreviation

WPW, Wolff-Parkinson-White; AVNRT, atrioventricular nodal reentrant tachycardia; AF, atrial fibrillation; PSVT, paroxysmal supraventricular tachycardia; DNA, deoxyribonucleic acid.