The Influence of Different Multipolar Mapping Catheter Types on Procedural Outcomes in Patients Undergoing Pulmonary Vein Isolation for Atrial Fibrillation.

(1) Background: During pulmonary vein isolation (PVI) for atrial fibrillation (AF), multipolar mapping catheters (MMC) are often used. We aimed to compare the procedural outcomes of two MMCs, specifically a circular-shaped and a five-spline-shaped MMC. (2) Methods: We enrolled 70 consecutive patients in our prospective, observational trial undergoing PVI procedures for paroxysmal AF. The initial 35 patients underwent PVI procedures with circular-shaped MMC guidance (Lasso Group), and the procedures for the latter 35 cases were performed using five-spline-shaped MMC (PentaRay Group). (3) Results: No significant differences were identified between the two groups in total procedure time (80.2 ± 17.7 min vs. 75.7 ± 14.8 min, = 0.13), time from femoral vein puncture to the initiation of the mapping (31.2 ± 7 min vs. 28.9 ± 6.8, = 0.80), mapping time (8 (6; 13) min vs. 9 (6.5; 10.5) min, = 0.73), duration between the first and last ablation (32 (30; 36) min vs. 33 (26; 40) min, = 0.52), validation time (3 (2; 4) min vs. 3 (1; 5) min, = 0.46), first pass success rates (89% vs. 91%, = 0.71), left atrial dwelling time (46 (37; 53) min vs. 45 (36.5; 53) min, = 0.56), fluoroscopy data (time: 150 ± 71 s vs. 143 ± 56 s, = 0.14; dose: 6.7 ± 4 mGy vs. 7.4 ± 4.4 mGy, = 0.90), total ablation time (1187 (1063; 1534) s vs. 1150.5 (1053; 1393.5) s, = 0.49), the number of ablations (78 (73; 93) vs. 83 (71.3; 92.8), = 0.60), and total ablation energy (52,300 (47,265; 66,804) J vs. 49,666 (46,395; 56,502) J, = 0.35). (4) Conclusions: This study finds comparable procedural outcomes bet-ween circular-shaped and five-spline-shaped MMCs for PVI in paroxysmal AF, supporting their interchangeability in clinical practice for anatomical mapping.