Background Fetal heart block (FHB) occurs in approximately 1:20 000 births and is associated with significant morbidity and mortality. Vaginal delivery with intrapartum fetal scalp lactate monitoring is offered as an option at our centre for selected cases, in contrast with the published literature advocating caesarean birth. Aims To review perinatal outcomes at delivery for FHB at a tertiary referral hospital. Materials and Methods Ours was a retrospective cohort study from 1 January, 2007 to 30 June, 2020. The infant outcomes are summarised in three delivery groups: vaginal delivery, planned caesarean section (CS) and unplanned CS. Results There were 23 newborns in the study period, with a median gestation at birth of 37.2 weeks and there was one antepartum fetal death in this cohort. Vaginal delivery was planned in 12 women: eight had normal births, three of these women progressed to an intrapartum (unplanned) CS and one woman had a planned CS. All live babies in the vaginal delivery cohort had an Apgar score greater than seven at five minutes. Of the 22 newborns, six required intubation, of which five had been delivered by a planned CS. Conclusion Our data suggest that planned vaginal delivery is a safe option for selected women carrying a fetus with FHB. Managing labour with serial fetal scalp lactates, and the involvement of senior clinicians are important factors in achieving a successful outcome.

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Virtual poster abstracts as the number of planes that could not be adequately displayed (47 vs. 12/945 planes; p = 0.007). For the unexperienced the 3VT, 5CV and Arch views were the most difficult planes that needed manual adjustment. The cardiac axis calculated for both unexperienced operators and expert was within the normal range between 17.2 to 53.5 • (r = 0.77). Conclusions: Fetal cardiac volume acquisition and subsequent FINE application is feasible and easy to learn even for unexperienced operators an might aid in further improvement of detection of congenital heart disease. VP14.09 Evaluation of novel fetalHQ technique, for comprehensive cardiac function assessment of fetal anemia