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VP18.07: Mid‐trimester left ventricular modified myocardial performance index of selective intrauterine growth restriction in monochorionic pregnancies

pregnancy, 3 fetuses were lost to follow up and one pregnancy is still ongoing. In the RAI group 5/18 pregnancies (27%) were terminated and one fetus was lost to follow up. Arrhythmia was only present in the LAI group: 8/28 (29%) fetuses with LAI had third degree AV Block, of which three developed hydrops. Overall 29 fetuses (63%) were live born. Eighteen (18/29, 62%) newborns survived the first year, and 15/29 (51%) patients were alive at the time of data collection at a median age of 5.4 years. Biventricular anatomy was present in 8/17 (47%) patients in the LAI group univentricular palliation was more common in the RAI group: 10/12 patients underwent at least the first step of palliation, 5/12 (42%) children with RAI have reached the Fontan procedure stage after palliative surgery. One neonate (RAI) was found to be inoperable, and one child had a biventricular corrective surgery. Conclusions: In this study, fetuses with RAI and complex cardiac disease had a slightly more favourable outcome than previously described, once they survive the first year of life.