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Abstract #4452

Assessment of Acute Cryo and RF Ablation Lesions by Non-contrast and Contrast Enhanced MRI Techniques: Similarities and Differences

Eugene G. Kholmovski 1 , Ravi Ranjan 2 , Joshua Silvernagel 2 , and Nassir F. Marrouche 2

1 UCAIR, Department of Radiology, University of Utah, Salt Lake City, Utah, United States, 2 CARMA Center, University of Utah, Salt Lake City, Utah, United States

Catheter radio-frequency (RF) and cryo-ablations are being increasingly used for treatment of atrial fibrillation and ventricular tachycardia. However, reported success rate of the procedures is moderate. The main causes of procedure failure are tissue recovery and gaps in ablation. The extent of ablations and lesion permanency cannot be accurately evaluated by conventional electro-physiological measurements. MRI can be used to assess lesions dimension and to predict their permanency. In this study, we have compared visibility of acute cryo and RF ablation lesions using non-contrast and contrast enhanced MRI techniques. Cryo and RF lesions have similar appearance in post-contrast T1w and LGE MRI images. However, the lesions have significantly different appearance in native T1w and T2w images.

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