LAUSR

Background Congenital heart defects (CHDs) are the commonest congenital malformation with an incidence of 8–9/1000 live births. There remains a significant variation among centres in detection of CHDs on fetal anomaly screening (FAS). Aims To study the outcomes in cases with suspected CHD on fetal anomaly screening. Methods A retrospective observational study involving FAS performed at our maternity hospital between Jan 2015-Dec 2017. For cases with a suspected cardiac abnormality on FAS, further data was collected from patient records. Results A total of 14,878 FAS scans were performed and 119 cases were suspected to have CHD. 99 cases were referred for specialist fetal echocardiography (ECHO), of which 51% (50) were abnormal. Fetal echocardiography diagnoses are shown in table 1. Pregnancies continued in 84% (42/50) of cases. 69% (29/42) of deliveries occurred at our maternity hospital. 31% (9/29) of births were premature (<37 weeks) and had a birth weight <2500 grams. Postnatal prostaglandin E1/E2 was required for 9 infants (31%). Five of these infants had critical CHD needing intervention under 1 year of age. 14 (48%) infants needed an intervention between 1 month and 1 year of life. The overall 1 year survival rate was 92%. Conclusions In our cohort, half of the cases with suspected CHD on FAS and referred for specialist fetal echocardiography had a congenital heart defect. Most pregnancies continued to term and overall outcome after surgical intervention was very good (92% survival rate at 1 year of age).Abstract G384 Table 1 Diagnosis on fetal echocardiography Congenital Heart Defect No of cases (%) Left sided 16 (32) Right sided 16 (32) Septal defects 10 (20) Complex 8 (16)