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Zero-fluoro atrioventricular-nodal reentrant tachycardia ablation

Strahlungsfreie AVNRT(Atrioventrikularknoten-Reentrytachykardie)-Ablation

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Abstract

Background

Atrioventricular-nodal reentrant tachycardia (AVNRT) is a common supraventricular tachycardia, particularly in younger patients. The treatment of choice is radiofrequency catheter ablation (RFCA), traditionally necessitating ionizing radiation for catheter guidance.

Objective

The authors aimed to demonstrate the feasibility and safety of zero-fluoroscopy RFCA of AVNRT using EnSite™ NavX™ as a three-dimensional (3D) electroanatomical mapping system (EAM).

Methods

The authors retrospectively analyzed 68 patients that underwent AVNRT-RFCA. One group was a priori allocated to conventional fluoroscopy mapping (convFluoro, n = 30). In 38 cases, the electrophysiologist chose to use 3D-EAM for ablation. Of these patients, 20 could be ablated without fluoroscopy use (zeroFluoro). In 18 cases that were initially intended as 3D-EAM, additional fluoroscopy use was necessary due to difficult anatomic conditions (convertedFluoro). Procedure duration, fluoroscopy duration and dose, as well as complications were analyzed.

Results

Procedure duration was similar for the convFluoro and zeroFluoro groups (74 ± 24 min vs. 80 ± 26 min, p = ns). The convertedFluoro group showed longer procedure duration compared to the convFluoro group (94 ± 30 min vs. 74 ± 24 min, p < 0.05). The use of 3D-EAM significantly reduced fluoroscopy duration comparing the convFluoro with the convertedFluoro group (12 ± 9 min vs. 7 ± 6 min, p < 0.05). The difference in fluoroscopy dose between convFluoro and convertedFluoro did not reach significance (169 ± 166 cGycm2 vs. 134 ± 137 cGycm2, p = ns). In zeroFluoro cases, no radiation was used at all. 3D-EAM-guided RFCA was primarily successful in all patients. Overall, there were only few minor complications in the different groups. No major complications occurred.

Conclusion

Zero-fluoro RFCA in patients with AVNRT is feasible and safe. 3D-EAM can reduce radiation exposure in the majority of patients without prolonging procedure duration or increasing complications.

Zusammenfassung

Hintergrund

Die Atrioventrikularknoten-Reentrytachykardie (AVNRT) stellt besonders bei jungen Menschen eine verbreitete supraventrikuläre Tachykardie dar. Die Therapie der Wahl ist die Katheterablation in Radiofrequenztechnik (RFA), wofür klassischerweise ionisierende Strahlung zur Steuerung des Katheters eingesetzt werden muss.

Fragestellung

Ziel dieser Arbeit war es, die Durchführbarkeit und Sicherheit einer strahlenlosen AVNRT-RFA unter dem Einsatz von EnSite™ NavX™ als 3‑D-elektroanatomisches Mappingsystem (EAM) zu demonstrieren.

Methoden

Es wurden 68 Fälle einer AVNRT-RFA retrospektiv analysiert. Eine Gruppe wurde a priori dem konventionellen Mapping mit Durchleuchtung zugeteilt (convFluoro, n = 30). In 38 Fällen entschied sich der Elektrophysiologe für eine Ablation mit 3‑D-EAM. Von diesen konnten 20 Fälle ohne Durchleuchtung erfolgen (zeroFluoro). In 18 der dem 3‑D-EAM zugeordneten Fällen war die zusätzliche Nutzung von Strahlung aufgrund schwieriger anatomischer Verhältnisse notwendig (convertedFluoro). Die Auswertung umfasste Prozedurzeit, Durchleuchtungszeit und Strahlendosis sowie das Auftreten von Komplikationen.

Ergebnisse

Hinsichtlich der Prozedurzeiten fand sich kein Unterschied im Vergleich der convFluoro- und der zeroFluoro-Gruppe (74 ± 24 min vs. 80 ± 26 min, p = ns). In der convertedFluoro-Gruppe traten längere Prozedurzeiten verglichen mit der convFluoro-Gruppe auf (94 ± 30 min vs. 74 ± 24 min, p < 0,05). Durch die Nutzung des 3‑D-EAM konnte die Durchleuchtungszeit der convertedFluoro- verglichen mit der convFluoro-Gruppe signifikant reduziert werden (7 ± 6 min vs. 12 ± 9 min, p < 0,05). Hinsichtlich der Strahlendosis zeigte sich kein signifikanter Unterschied im Vergleich der convertedFluoro- mit der convFluoro-Gruppe (169 ± 166 cGycm2 vs. 134 ± 137 cGycm2, p = ns). In der zeroFluoro-Gruppe konnte vollständig auf ionisierende Strahlung verzichtet werden. Die 3‑D-EAM-gesteuerte RFA war bei allen Patienten primär erfolgreich. Insgesamt kam es zu wenigen geringfügigen Komplikationen in den verschiedenen Gruppen. Bedeutende Komplikationen traten nicht auf.

Schlussfolgerung

Die strahlungsfreie RFA in Patienten mit AVNRT ist machbar und sicher. Durch 3‑D-EAM kann die Strahlenexposition in der Mehrzahl der Patienten reduziert werden, ohne die Prozedurzeit zu verlängern oder die Komplikationsrate zu erhöhen.

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Correspondence to Joachim R. Ehrlich MD, FESC, FHRS, FAHA.

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C. Soether, A.A. Boehmer, B.C. Dobre, B.M. Kaess and J.R. Ehrlich declare that they have no competing interests.

For this article no studies with human participants or animals were performed by any of the authors. All studies mentioned were in accordance with the ethical standards indicated in each case.

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Soether, C., Boehmer, A.A., Dobre, B.C. et al. Zero-fluoro atrioventricular-nodal reentrant tachycardia ablation. Herzschr Elektrophys 34, 305–310 (2023). https://doi.org/10.1007/s00399-023-00977-w

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