Authors

• Janko Szavits Nossan — Magdalena Clinic for Cardiovascular Disease, Krapinske Toplice, Croatia — ORCID: 0000-0001-9634-9511
• Vito Mustapić — Magdalena Clinic for Cardiovascular Disease, Krapinske Toplice, Croatia — ORCID: 0000-0001-5533-7215
• Igor Šesto — Magdalena Clinic for Cardiovascular Disease, Krapinske Toplice, Croatia — ORCID: 0000-0002-2201-4425
• Lucija Barbarić — Magdalena Clinic for Cardiovascular Disease, Krapinske Toplice, Croatia — ORCID: 0000-0001-8317-2219
• Nikola Jutriša — Magdalena Clinic for Cardiovascular Disease, Krapinske Toplice, Croatia — ORCID: 0000-0003-4704-517X
• Iva Kopčić — Johnson and Johnson, Biosense Webster — ORCID: 0000-0002-7995-1452

Keywords

ablation, macro-reentry tachycardia, focal atrial tachycardia, high-density mapping

DOI

Full Text

**Aim**: To determine in-hospital and long-term results of atrial macro-reentry and focal tachycardia ablation using high-density mapping. **Patients and Methods**: In 2021 and 2022, a total of 47 consecutive patients with atypical macro-reentry and focal atrial tachycardia were ablated using the 3D mapping system. Ablations were performed using Carto 3 (Biosense Webster) mapping system in all patients, but high-density mapping catheter with new Carto Prime module was used only in patients ablated in 2022 (total 29). **Results**: Ablation procedure was successful in 96% of all patients with no inducible tachycardia at the end. Mean follow-up period was 11 months (3-19 months) for all patients. Patients ablated in 2022 had shorter mean follow-up period of 7 months (3-11 months) compared to patients ablated in 2021, but majority of relapses occurred within first 6 months after ablation. Daily trans-telephonic ECG was used for follow up in 85% of patients (similar in both groups) and clinical follow up with Holter ECG after 6 months in 99% and 90% of patients, respectively (similar in both groups). 96% of patients ablated in 2022 were free from any tachycardia in the follow up period in comparison to 78% of patients ablated in 2021. Proportion of macro-reentry tachycardias was significantly higher in 2022 when high-density mapping was used, suggesting better understanding of the tachycardia mechanism. **Conclusion**: High-density mapping system increases acute and short-term results of atrial macro-reentry and focal tachycardias (1).

Literature

1. Luik A, Schmidt K, Haas A, Unger L, Tzamalis P, Brüggenjürgen B. Ablation of Left Atrial Tachycardia following Catheter Ablation of Atrial Fibrillation: 12-Month Success Rates. J Clin Med. 2022 February 17;11(4):1047. https://doi.org/10.3390/jcm11041047