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Figure 3 Acetylcholine Model of Atrial Flutter

Location and direction of re-entry in 6 examples of atrial flutter (AFL) induced in a canine acetylcholine infusion model of AFL. The AFL cycle lengths ranged from 65 to 145 ms (average: 109 ms). Reprinted, with permission, from Allessie MA, Lammers WJEP, Bonke FIM, et al. Intraatrial re-entry as a mechanism for atrial flutter induced by acetylcholine in rapid pacing in the dog. Circulation 1984;70:123–35.