Clinical outcomes after using of Rhythmia mapping system in patients with differentcomplex arrhythmias

Abstract: Background: Rhythmia is a novel mapping system of cardiac arrhythmias, it utilizes a multielectrode catheter, Orion. Together these two instruments generate high accurate maps of the cardiac chamber which facilitate the identification of arrythmia focus and its ablation. Objective: our aim of this study was to evaluate the safety and feasibility of the Rhythmia system, mid-term recurrence rate and the predictors of recurrence from intervention and patients related factors. Methods: this was a retrospective cohort analysis on patients who underwent cardiac ablation with Rhythmia system at Örebro University Hospital between October 2017 and March 2020. The patients were followed-up to evaluate the recurrence. Results: 62 ablation procedures were included, premature ventricular contraction 20, atrial fibrillation 19, ectopic atrial tachycardia 10, ventricular tachycardia 6, atrial flutter 5 and accessory pathways 2. Rhythmia was feasible with 100% technically successful procedures. It had also low complications risk, with an overall 6.5% complications rate. Over a mean follow up of 5.1 months (Range 1-12), 59% of patients got recurrence. The highest recurrence rate of 75% was observed in the premature ventricular complex group. None of all studied variables showed any statistically significance association with the recurrence of the most three encountered arrhythmias. Conclusion: the use of Rhythmia was feasible and relatively safe. The recurrence rate of arrhythmias after using Rhythmia was high, and no reliable predictors could be found. However, there was a trend that atrial fibrillation which required long total procedure time and long fluoroscopy time had higher risk to recur.