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Funding Acknowledgements EACVI Training Grant Introduction Children with Hypoplastic Left Heart Syndrome (HLHS) have a high mortality (up to 95%) and morbidity. Systemic right ventricle (RV) dysfunction plays a key-role in their outcome. Purpose The aim of this study is to evaluate the accuracy of speckle-tracking echocardiographic (STE) assessment of RV deformation and 2D standard echo parameters in predicting death and need for heart transplantation (HT) in HLHS patients. Methods 31 patients with diagnosis of HLHS successfully completed Norwood (n = 29) or comprehensive Norwood stage II (n = 2) at our Institution between 2015 and 2019. Survival at 6 months was 90.32%, survival at 18 months was 85.72%. We studied 29 HLHS patients (17 male). Patients with HLHS variant (n = 2) were excluded. All the studied patients underwent in-hospital interstage stay. Serial echocardiographic assessment was performed in all the included patients (baseline, one month after Norwood, three months after Norwood, one week before bidirectional cavopulmonary anastomosis [BCPA] and two months after BCPA). From the apical view we measured: tricuspid annulus peak systolic excursion (TAPSE), fractional area change (FAC), longitudinal strain (LS) and strain rate (LSR). Results After a mean follow-up of 1.83 ± 1.16 years, 8 out of 29 of the included patients met the composite endpoint of death/HT. At pre-Norwood assessment, there was no statistical difference in echo measurements between survivors and patients who reached the endpoint. In death/HT group TAPSE and LS declined already at one-month after Norwood procedure evaluation. At one-month evaluation, a TAPSE ≤ 5 mm had a good sensitivity for death/HT (85.71%) and a moderate specificity (66.67%), with an area under the curve of 0.789. Always at one-month evaluation, a Δ LS ([{baseline LS – one-month post Norwood LS}/ baseline LS] *100) of 8.7% showed a 100% sensitivity and good specificity (80.95%) for death/HT, with an area under the curve of 0.888. Multivariate analysis showed that one-month-after-Norwood Δ LS was the best predictor of worse outcome (p = 0.02). Conclusions HLHS patients with Δ LS of &amp;gt; 8.7% at one-month after Norwood procedure had a high likelihood of death or HT. These data encourage the routine use of LS to monitor cardiac function in HLHS patients. Abstract 1233 Figure. HLHS LS and trend of TAPSE and LS.

1233 Can speckle tracking echocardiography predict outcome in hypoplastic left heart syndrome patients?