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Barium esophagography showing esophageal displacement during RF catheter ablation of AF. In A, the thermometer position is satisfactory; however, in B, the thermometer is misplaced and should not be considered for temperature control of the ablation. The yellow dotted lines show the esophageal lumen contour. Enough bilateral esophageal displacement can also be observed, allowing safe ablation. AF=atrial fibrilation; RF=radiofrequency
