Comparison between new confidense HD coloring cartomapping module and new rhythmia mapping system for scar related atrial tachycardia treatment. A prospective randomised study: Preliminary results

Abstract

Background Scar-related atrial tachycardias (ATs) are very challenging. Thus far, no comparative studies have been conducted between the up-to-date systems, namely the new confidense HD colouring mapping module (Carto 3 v. 4, Biosense Webster) (HD) and the new rhythmia (Boston Scientific) (RM) mapping system. Objectives Our study sought to compare both strategies in terms of: –\xa0diagnosis and immediate treatment success; –\xa0procedure parameters in AT presenting patients. Methods and results Overall, 38 patients (68\xa0±\xa09 years old) with complete mapping and ablation were randomised (HD\xa0=\xa020, RM\xa0=\xa018). The HD and RM groups displayed similar characteristics and etiologies. The AT mechanisms did not differ between the groups: macro/small loop re-entrant mechanisms were more common in both groups (12/20 [60%] versus 10/18 [56%], P\xa0=\xa00.9), with the remaining diagnosed as multi-loop (5/20 [25%] versus 4/18 [22%]; P\xa0=\xa00.9); focal (1/20 [5%] versus 2/18 [11%], P\xa0=\xa00.9), and localised re-entrant (2/20 [10%] versus 2/18 [11%]). The procedure parameters were as follows: tachycardia cycle length (275\xa0±\xa030 vs. 280\xa0±\xa050; P\xa0=\xa00.7); number of activation maps per patient (2\xa0±\xa01 vs. 2\xa0±\xa01; P\xa0=\xa00.9); procedure time (138\xa0±\xa090 vs. 139\xa0±\xa090\xa0min; P\xa0=\xa00.98); X-ray time exposure (20\xa0±\xa011 vs. 24\xa0±\xa018\xa0min; P\xa0=\xa00.42); RF application time (39\xa0±\xa036 vs. 25\xa0±\xa028\xa0min; P\xa0=\xa00.21); and mean number of circuits per patient (1.8\xa0±\xa01 vs. 1.6\xa0±\xa00.9; 0.6). Acute success was obtained in 15/20 pts (75%) of the HD group and 14/18 (78%) of the RM group (P\xa0=\xa00.9). Two patients who failed to achieve the primary endpoint with the HD colouring were secondly converted to the RM group without success. No crossover was carried out in the RM group. Conclusions The preliminary results of this prospective monocentre randomised study demonstrate that HD colouring and rhythmia systems exhibit a similar efficacy in achieving acute AT termination.