Cited by 152Cardiac Arrhythmias and TreatmentsCardiac electrophysiology and arrhythmiasAtrial Fibrillation Management and Outcomes

Right Atrial Flutter Due to Lower Loop Reentry: Mechanism and Anatomic Substrates

Cheng, Jie, Cabeen, William R., Scheinman, Melvin M.·1999·Circulation

Abstract

BACKGROUND: The mechanisms of an atrial flutter (AFL) that is more rapid and at times more irregular than typical AFL are unknown. METHODS AND RESULTS: Twenty-nine patients with AFL were studied. Atrial electrograms were recorded from a 20-pole catheter placed against the tricuspid annulus (TA), with its distal electrodes lateral to the isthmus between the TA and the eustachian ridge (ER), and from the His bundle and coronary sinus catheters. Atrial extrastimuli were delivered in the TA-ER isthmus during typical AFL. Episodes of a right atrial flutter rhythm that was different from typical AFL were induced in 3 patients and occurred spontaneously in 3 patients. This sustained AFL, designated as lower-loop reentry (LLR), involved the lower right atrium (RA), as manifested by early breakthrough in the lower RA, wave-front collision in the high lateral RA or septum, and conduction through the TA-ER isthmus. Linear ablation resulting in bidirectional conduction block in the TA-ER isthmus terminated spontaneous LLR in 3 patients and rendered LLR noninducible in all patients. The cycle length of LLR was shorter than that of typical AFL (217+/-32 versus 272+/-40 ms, P<0. 01). Alternating LLR and typical AFL in 1 patient resulted in cycle length oscillation. CONCLUSIONS: LLR is a subtype of right atrial flutter and depends on conduction through the TA-ER isthmus.

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Crossref · 10.1161/01.cir.99.13.1700

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Authors
Cheng, J., Cabeen, W. R., & Scheinman, M. M.
Affiliations
University of California, San Francisco (US)
Venue
Circulation
Published
1999-04-06
Volume
99
Issue
13
Pages
1700-1705
ISSN
  • 0009-7322 (ISSN-L)
  • 1524-4539
OpenAlex
W1971137991
Cited by
152
References
19
Citations by year
2026: 2 · 2025: 2 · 2024: 2 · 2022: 2 · 2021: 2 · 2020: 1 · 2019: 3 · 2018: 3 · 2017: 2 · 2016: 2 · 2015: 2 · 2014: 1 · 2013: 3 · 2012: 10
FWCI
6.27
Type
journal article
Language
en
Open access
closed
Locations
  • Circulation (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac Arrhythmias and Treatments
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac electrophysiology and arrhythmias
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Atrial Fibrillation Management and Outcomes
Keywords
right atrial flutter, atrial flutter mechanism, tricuspid annulus, bidirectional block, atrial electrograms, atrial flutter ablation
MeSH terms
Adult, Aged, Atrial Flutter, Electrocardiography, Electrophysiology, Female, Heart Conduction System, Humans, Male, Middle Aged

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