Detection of fetal heart defects is an important aspect of prenatal diagnostic ultrasound. A recent study by Haberer and colleagues in the Journal of the American Society of Echocardiography investigated the diagnostic accuracy of fetal echocardiography. They looked at all of the fetuses with major cardiac anomalies diagnosed at a single institution over an 11-year period and compared the fetal echocardiogram reports with postnatal imaging, surgical reports, and autopsies. Of the almost 600 cases examined, 90% of the diagnoses were accurate. The highest rate of accuracy was for univentricular hearts defects (97.6%) and the lowest was with heterotaxy (71.1%). This article is important because findings show that diagnostic accuracy of fetal echocardiography was high for major fetal cardiac defects.
The ability to accurately diagnose placenta accreta prenatally is important to obstetricians because of the increased risk it poses for maternal morbidity and mortality. This issue is considered in a recent systematic review and meta-analysis by Hong and colleagues in the journal Insights into Imaging . They compared ultrasound to MRI for diagnostic accuracy of placenta accreta spectrum disorder (PAS). In the studies they examined, the diagnostic accuracy of ultrasound for PAS had a sensitivity of 0.9 and a specificity of 0.83, while the diagnostic accuracy of MRI had a sensitivity of 0.89 and a specificity of 0.87. This shows that the diagnostic accuracy of PAS is similar for both ultrasound and MRI. Given the significant expense of an MRI, this raises the question of its importance in the role of evaluating patients suspected of placenta accreta.
Precise prenatal diagnosis of estimated fetal weight (EFW) is central to the care of pregnant patients. It allows for appropriate timing of delivery to decrease the risk for stillbirth. A recent article by Visentin and colleagues evaluates prenatal methods for estimation of fetal weight and prediction of small-for-gestational-age (SGA) fetuses. The researchers performed a retrospective review of singleton gestations that were at increased risk for fetal growth restriction from two hospitals. They found that EFW z-scores derived from either the Hadlock method or the International Fetal and Newborn Growth Consortium for the 21st Century (INTERGROWTH-21st) assessment were similar and more accurate than abdominal circumference (AC) z-scores for detecting SGA infants. This study should open the debate again on how to best measure estimated fetal weight: EFW alone or assessment of both EFW and AC.