Conclusions
RACT is a novel and promising marker of a potential right atrial flutter circuit and thereby the propensity for clinical atrial flutter. A value of 115.5 ms has a sensitivity and specificity of 92.7 and 93.0% respectively for the diagnosis of typical atrial flutter. This simple electrophysiologic marker presents opportunity for further study as a marker of future AFL risk and potential utility of tricuspid isthmus ablation at time of EP study.
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