An approach to left septal slow pathway ablation

  • Demosthenes G. Katritsis
  • Eleftherios Giazitzoglou
  • Theodoros Zografos
  • Kenneth A. Ellenbogen
  • A. John Camm
Article
First Online:
Received:
Accepted:

Abstract

Background

Slow pathway ablation or modification eliminates typical atrioventricular nodal re-entrant tachycardia (AVNRT), but in less than 5% of patients cannot be accomplished from the right side.

Methods

Consecutive, consenting patients (n = 221), aged 37 ± 7 years, 177 women, with slow–fast AVNRT, underwent slow pathway ablation. Mapping was restricted to the inferior part of the triangle of Koch, and end-points of ablation were induction of a junctional rhythm with retrograde atrial conduction and non-inducibility of AVNRT. Unsuccessful cases were ablated via a transeptal approach from the left septum with the aid of a left-sided His recording electrode.

Results

Right-sided ablation was successful in 217 of 221 cases. In four patients (1.8%), left-sided ablation was necessary. Procedure, fluoroscopy times, and number of lesions were 105 min (82.4–135) vs. 65 min (60–90) (p = 0.013), 31.9 (23.9–34.3) vs. 9.6 (6.2–14.2) min (p = 0.001), and seven (5.5–7.8) vs. four (4–5; p = 0.004) for left- vs. right-sided procedures, respectively. During a follow-up period of 1–3 years, three patients (1.3%) in the right group had AVNRT recurrence. All had residual dual pathway physiology following ablation, while only 20.3% of patients without AVNRT had residual dual AV nodal conduction (p < 0.001). No conduction disturbances were seen. In the left-sided ablation group, no AVNRT recurrences or AV block were seen.

Conclusions

Ablation with the protocol described offers a high success rate with an extremely low risk of AV block when left-sided ablation is necessary in patients with typical AVNRT who have failed a right-sided approach.

Keywords

Atrioventricular node Supraventricular tachycardia Radiofrequency ablation 
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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • Demosthenes G. Katritsis
    • 1
  • Eleftherios Giazitzoglou
    • 1
  • Theodoros Zografos
    • 1
  • Kenneth A. Ellenbogen
    • 2
  • A. John Camm
    • 3
  1. 1.Department of CardiologyAthens EuroclinicAthensGreece
  2. 2.Division of CardiologyVirginia Commonwealth UniversityRichmondUSA
  3. 3.Cardiac and Vascular SciencesSt George’s University of LondonLondonUK

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