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of 90.3 mm), on MRI the mean perimeter was 75.53 mm (minimum of 55.8 mm and maximum of 86 mm). In this case, the correlation coefficient of Pearson was R¼0.96 p<0.01, reporting statistically significant correlation between both measures. Annulus area was also measured on CT with a mean value of 416.9 mm 2 (minimum of 245 mm 2 and maximum of 595 mm 2 ) and MRI; reporting a mean value of 423.7 mm 2 (minimum of 250.5 mm 2 and maximum of 603.2 mm 2 ). The statistical analysis was also performed with the correlation coefficient of Pearson, and the result was R¼0.96 p<0.01, finding again a good correlation between the area measured on MRI and the area measure on CT. Finally, it was observed that if the election of the valve size would have been based on MRI measures, the same valve size would have been implanted in all patients.CONCLUSION Despite the low number of patients included, all the measures obtained on MRI (diameter, perimeter and area) have a very good correlation to the measures obtained on CT. It means that any annulus measure on MRI can reliability estimate a measure on CT. In fact, the TAVR size selection was the same in all patients whichever was the method used to assess the aortic annulus. These results open a new possibility to patients in who CT cannot be performed. Studies with higher number of patients must been carried out.Abstract nos: 512 -544 BACKGROUND Coronary flow reserve (CFR) is a strong predicator of long-term patient outcomes. Discordance between resting and hyperemic indices of coronary physiology creates a diagnostic dilemma as to whether a stenosis is truly flow-limiting or not. The mechanism underlying fractional flow reserve (FFR) and instantaneous wave-free ratio (iFR) discordance is not fully defined but may be related to differences in CFR. METHODSThe frequency of FFR/iFR discordance was identified from a large core laboratory analysis of 1041 lesions in which both FFR and B206

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