Early detection of fetal cardiac abnormalities: how effective is it and how should we manage these patients?

Area of Science:

• Medical imaging
• Prenatal diagnostics
• Cardiology

Background:

• Congenital heart defects (CHDs) are common congenital malformations leading to significant mortality and morbidity.
• Advancements in ultrasound technology and recognition of early markers have increased interest in first-trimester CHD screening.
• Early fetal echocardiography (EFEC) is feasible before 16 weeks' gestation with adequate expertise.

Purpose of the Study:

• To review the detection of major CHDs in the first and early second trimesters.
• To identify specific markers for high-risk groups amenable to EFEC.
• To assess the diagnostic accuracy and utility of EFEC.

Main Methods:

• Review of first-trimester screening for major CHDs.
• Identification of markers such as increased nuchal translucency, abnormal ductus venosus flow, and tricuspid regurgitation.
• Evaluation of EFEC sensitivity and concordance with mid-gestational echocardiograms in high-risk populations.

Main Results:

• First-trimester CHD detection rates vary (2.3-56%) based on experience and population.
• Increased nuchal translucency, abnormal ductus venosus flow, and tricuspid regurgitation are associated with increased CHD risk.
• EFEC shows 78.5% sensitivity and 74.5% concordance with later scans in high-risk groups.

Conclusions:

• EFEC can identify high-risk fetuses for congenital heart defects using specific first-trimester markers.
• Skilled personnel and diagnostic accuracy are crucial for implementing EFEC in management protocols.
• Limitations of EFEC necessitate a later confirmatory echocardiogram.