PM408 Comprehensive Right Heart Systolic Function Assessment Using Cardiac Magnetic Resonance Imaging (CMR) After Inferior St Elevation Myocardial Infarction - CMR characteristics and short term clinical outcomes

O ST E R A B ST R A C T S were measured using Circle CVi42 software by expert observers. Metrics ( SD) were compared with the student T-test using MedCalc. Results: Mean age 28 12 years, RVEDV 239 59 ml, RVESV 134 44 ml, RVEF 44 6%, LVEF 51 6%. Mean distance between PV and MPA flow acquisition planes was 15.3mm. Statistically significant differences in flow metrics occurred between PV and MPA measurements: Forward flow 95.7 21m vs. 90.5 13ml (P1⁄40.0001), Backward flow 23.9 19ml vs. 21.2 17ml (P<0.0001), regurgitant fraction 25 19 % vs. 23 17% (P1⁄40.0002, figure 2). In 25% of cases the difference in RF%was greater than 5%.MPA and PV stroke volumes had good correlation with RV stroke volume from cine imaging (r1⁄40.70, r1⁄40.71 respectively). Interobserver reproducibility of RVol and RF% was excellent, Pearson’s correlation r1⁄40.99. Conclusion: MRI flow measurements acquired at the PV level are more sensitive to both forward flow and backward flow, and these measurements are highly reproducible. There is a statistically and clinically significant reduction in RVol and RF% when measured at the MPA level. For accurate quantitation of pulmonary RF% in TOF patients, MRI flow acquisitions should be close to the PV valve plane. This is important to accurately inform decision-making in the management of repaired TOF. Disclosure of Interest: None Declared