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Upper turn-around of the reentry circuit in typical atrial flutter (AF) is classically described to be located in front of the superior vena cava (SVC), but circuits posterior to the SVC as well as lower loop reentry (LLR) involving only the lower part of the right atrium have been described. However, true prevalence of such AF circuits remains unknown.

Prevalence of typical atrial flutter with reentry circuit posterior to the superior vena cava: Use of entrainment at the atrial roof