Heart doctors studying baby heart scans have good news for many cases of tricuspid regurgitation found before birth. This leak in the tricuspid valve shows up often on fetal echocardiography, but its link to newborn health was not clear until now. In the study published in the Journal of the American Society of Echocardiography, the researchers at one center reviewed all 67 fetuses diagnosed with non-Ebsteinoid TR from 2012 to 2023. 
The researchers split cases into mild, moderate, and severe based on first scans at a median of 26.3 weeks gestation. The team tracked changes through repeat scans, postnatal echoes, and baby outcomes. Their work helps decide when to worry and what to check after birth.
Breaking Down the Fetal Findings
Most fetuses had mild TR at 73.1%, with 49 cases, followed by moderate at 22.4% or 15 cases, and severe in just 3 or 4.5%. Among mild TR cases, 17.9% got worse in the womb, and 17.6% worsened after birth. Every worsening case had tricuspid valve dysplasia or right ventricle problems spotted prenatally. Fetuses with mild TR plus valve dysplasia showed bigger valve rings at 1.12 cm versus 0.96 cm and larger right ventricle sizes in diastole at 1.59 cm versus 1.26 cm with a significant difference. 
Newborns Face Different Paths
Babies from severe prenatal TR cases all needed cardiac intensive care right after birth—100% or 3 out of 3—far higher than mild TR at 2% or one out of 49 and moderate at 6.7% or one out of 15. This may guide delivery planning and early care.
When Mild TR Signals No Big Trouble
Without valve dysplasia or right ventricle weakness, mild non-Ebsteinoid TR looks benign today. Modern scans and care mean these often fade without harm. But valve issues or poor imaging call for postnatal checks to catch hidden heart problems.
Guidance for Fetal Heart Teams
For obstetricians and pediatric cardiologists, this means reassuring parents on isolated mild TR while flagging risks with added findings. Serial echoes track changes, and severe cases prep for NICU heart support. The study stresses full anatomy reviews to differentiate benign from serious.