Correlation between sinus rhythm deceleration zones and critical sites for localized reentrant atrial flutter: A retrospective multicenter analysis

Christopher E. Woods, Amir A. Schricker, Hemal Nayak, Ramesh Hariharan, Brady Stevens, Agatha Kwasnik, Nathan Shatz, Lucas Suchomel, Ryan Moskovitz, Jonathan Salcedo, Roger Winkle, Roderick Tung

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Background: Atypical left atrial flutter (AFL) may be macroreentrant or spatially localized. The relationship between the critical isthmus (CI) for localized reentry with sinus rhythm (SR) conduction slowing has not been systematically examined. Objective: To examine the correlation between CI sites for localized AFL (L-AFL) and deceleration zones (DZ) identified by isochronal late activation mapping (ILAM) during baseline rhythm. Methods: Patients with localized AFL who underwent high-density activation mapping of both SR and AFL were retrospectively analyzed. L-AFL was defined as reentry restricted to 2 wall segments of the left atrium. CI was defined by activation mapping and sites of successful termination during ablation. DZ, defined as >3 isochrones within 1 cm radius during baseline rhythm, were correlated to the locations of the CI. Results: Thirty-one consecutive patients that underwent detailed sinus rhythm and AFL high-density activation maps were analyzed at 3 centers. A mean 4060 ± 3275 and 6209 ± 8656 points were collected in ILAM and AFL activation maps, respectively. At least 1 DZ (1.7 ± 0.77) was identified in all patients. ILAM showed 3.27 ± 0.52 isochrones per DZ (168 ± 32 ms), and co-localized to CI sites at a distance of 6.7 ± 3 mm. A total of 34% ± 14% of the AFL cycle length was contained within 0.5 cm of the DZ. Conclusions: In patients with L-AFL, CI co-localized with DZ during baseline rhythm, suggesting that DZ mapping during SR may yield candidate targets for ablation as an adjunct to pulmonary vein isolation to prevent a subtype of AFL.

Original languageEnglish (US)
Pages (from-to)279-287
Number of pages9
JournalHeart Rhythm O2
Volume3
Issue number3
DOIs
StatePublished - Jun 2022
Externally publishedYes

Keywords

  • Atypical atrial flutter
  • Conduction slowing
  • Electroanatomic mapping
  • Isochronal mapping
  • Reentry

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

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