(Circulation. 2001;103:3092.)
© 2001 American Heart Association, Inc.
Clinical Investigation and Reports |
From the Cardiovascular Research Institute and Section of Cardiac Electrophysiology (Y.Y., J.C., A.B., R.J.L., P.R.S., L.A.S., M.D.L., G.W.M., M.M.S.), University of California, San Francisco, and the University of Texas Southwestern Medical Center and the Dallas Veterans Affairs Medical Center (M.H.H., R.C.K., R.P.), Dallas, Tex.
Correspondence to Melvin M. Scheinman, MD, Cardiac Electrophysiology, University of California, San Francisco, 500 Parnassus Ave, MU East 4S, Box 1354, San Francisco, CA 94143-1354. E-mail scheinman{at}medicine.ucsf.edu
BackgroundThe purpose of our study was to define the incidence and mechanisms of atypical right atrial flutter.
Methods and ResultsA total of 28 (8%) of 372 consecutive patients with atrial flutter (AFL) had 36 episodes of sustained atypical right AFL. Among 24 (67%) of 36 episodes of lower loop reentry (LLR), 13 (54%) of 24 episodes had early breakthrough at the lower lateral tricuspid annulus, whereas 11 (46%) of 24 episodes had early breakthrough at the high lateral tricuspid annulus, and 9 (38%) of 24 episodes showed multiple annular breaks. Bidirectional isthmus block resulted in elimination of LLR. A pattern of posterior breakthrough from the eustachian ridge to the septum was observed in 4 (14%) of 28 patients. Upper loop reentry was observed in 8 (22%) of 36 episodes and was defined as showing a clockwise orientation with early annular break and wave-front collision over the isthmus. Two patients had atypical right AFL around low voltage areas ("scars") in the posterolateral right atrium.
ConclusionsAtypical right AFL is most commonly associated with an isthmus-dependent mechanism (ie, LLR or subeustachian isthmus breaks). Nonisthmus-dependent circuits include upper loop reentry or scar-related circuits.
Key Words: electrophysiology atrial flutter catheter ablation mapping tachycardia
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