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116 Maternity and Obstetrics Alison Hickey, Midwife. which has seen year on year increases in the number of cases seen. This is in no small part owing to the exceptional and increasing skill of Obstetricians, Sonographers and Midwife Sonographers both at the NMH and around the country in picking up cardiac anomalies at routine anomaly scanning. The service is staffed by Professor Colin McMahon (Consultant Paediatric Cardiologist), Dr Siobhan Corcoran (Consultant Obstetrician and Fetal Medicine Subspecialist) and Ms Cecelia Mulcahy (Midwife Sonographer). We receive dedicated and continuous support from our Fetal Medicine CMS Heather Hughes and Barbara Cathcart. We are also very grateful for the support and expertise of our colleagues from Neonatology in offering optimal care for these complex cases. Table 6 gives a description of the cardiac anomalies that were antenatally diagnosed and managed by the service in 2020. This is reported in a "one patient, one diagnosis" fashion. The most relevant cardiac lesion is included. In total, 89 structural cardiac anomalies/dysrhythmias were managed in 2020 (Table 4 which demonstrates 81 cardiac abnormalities does not include Premature Atrial Contractions (4) any untreated arrhythmias (3)). 47 (53%) of the cases were internal referrals from The National Maternity Hospital and 42 (47%) were from referred from peripheral units. Apart from the anomalies, the Fetal Medicine Department also performed 224 targeted fetal echocardiograms where the result was normal. The indications for these echocardiograms are outlined in Table 2. 149 (66.5%) of these referrals came from with The National Maternity Hospital and (33.5%) were from peripheral units. As the availability and quality of routine anatomy scanning and aneuploidy screening increases across the country, it is likely that this service will continue to expand in the coming years. Dublin Fetal Surgery Group (Prof Fionnuala McAuliffe and Dr Stephen Carroll) Since 2010, the fetal surgical teams at The National Maternity Hospital, Dublin, and the Rotunda Hospital Dublin have collaborated jointly for the management of all cases of twin-to-twin transfusion syndrome 2020 | NMH Annual Rep t