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Receiver-Operator-Curves for diagnosing atypical AFL in Left Atrium (versus Right Atrium), show that spatial coherence in the Cartesian XY and Left-Rotated XZ planes provide ROC areas of 0.83 and 0.77 respectively. Arrows indicate the locations of cutpoints: for the Cartesian XY plane, coherence < 0.69 detected LA flutter with 84% specificity and 75% sensitivity and for left-rotated XZ plane, coherence < 0.13 detected LA flutter with 89% specificity and 63% sensitivity.
