Comparison of Diagnostic Markers of Aortic Coarctation in Prenatal and Postnatal Echocardiography

Background: The prenatal diagnosis of coarctation of aorta (CoA) remains a major challenge, as the false-positive diagnosis is fairly common. The purpose of this study was to find some useful prenatal sonographic markers compatible with the postnatal diagnosis of CoA. Methods: The study included fetuses suspected of CoA in the second and third-trimester ultrasound tests. All cases were examined by fetal echocardiography at a single ultrasound clinic between ۲۰۱۹ and ۲۰۲۰. The proportion of right and left ventricular size was assessed and ductal/isthmus diameter ratio was measured. A comparison was drawn between the results of neonates with neonatal CoA and neonates without CoA. Results: Of ۲۰ fetuses with suspected prenatal CoA, ۳ (۱۵%) had neonatal CoA. The mean ductal/isthmus ratio was significantly higher in the neonates with CoA (۱.۹۶ vs. ۱.۴۶; p< ۰.۰۰۱). The diagnostic power of ductal/isthmus ratio to detect CoA with a cut point of ۱.۵۳ had a sensitivity and specificity of ۱۰۰% and ۷۰.۶%, respectively, a positive and negative predictive value of ۳۷.۵% and ۱۰۰%, respectively, and an overall accuracy of ۷۵%. Conclusion: The ductal/isthmus ratio diameter and ventricular disproportion are significant sonographic markers for the prenatal diagnosis of CoA, and the ductal/isthmus ratio has high sensitivity and specificity compared to postnatal findings.

Keywords:

Aortic coarctation , Fetal echocardiography , Prenatal diagnosis