Objectives: On the long axis view of the fetal left ventricle the presence of a perimembranous defects is often suspected but a true subaortic ventricular septal defect (VSD) is postnatally conﬁrmed only in a small number of these cases. The aim of this study was to assess if the systematic use of the short axis view of the heart may improve the antenatal prediction of VSD in fetuses with suspected ﬁndings at 5 chamber view. Methods: Cases where an isolated subaortic VSD was suspected on the ﬁve chamber view of the fetal heart were subsequently assessed using the short axis scanning plane. On this plane the presence of a defect across the ventricular septum between the aortic wall and the tricuspid valve was searched upon (see ﬁgure). Postnatal assessment was performed in all fetuses within 2 weeks from birth at our Paediatric Cardiology Unit. Results: Overall a subaortic VSD was suspected on the long axis view in 18 fetuses and conﬁrmed on the short axis in 12 patients. At postnatal follow up a subaortic VSD was diagnosed in 10 cases, and in all of these the VSD had been antenatally documented in both the long and the short axis view. Only two cases with abnormal ﬁndings at long and short axis view were not conﬁrmed at postnatal assessment whereas all the 8 cases with a suspected VSD at the ﬁve chamber view only turned out to be false positive. Conclusions: The short axis view of the fetal heart seems useful in conﬁrming the presence of a perimembranous VSD suspected on the 5 chamber view.
Abstracts of the 26th World Congress on Ultrasound in Obstetrics and Gynecology, Rome, Italy, 24-28 September 2016 / Ghi, T; Volpe, N; Galli, L; Dall'Asta, A; Cavalli, C; Weiss, A; Kiener, A; Kaihura, C; Frusca, T. - In: ULTRASOUND IN OBSTETRICS & GYNECOLOGY. - ISSN 1469-0705. - STAMPA. - 48 Suppl 1(2016), p. 71. ((Intervento presentato al convegno 26th World Congress on Ultrasound in Obstetrics and Gynecology, Rome, Italy, 24-28 September 2016. tenutosi a Roma nel 25-28 Settembre 2016 [10.1002/uog.16214].