Heart surgery rewires the brain: how newborns with congenital heart disease recover neural connections

JNeurosci, March 2026

Before they are old enough to focus their eyes, some babies face open-heart surgery. Congenital heart disease affects roughly 1 in 100 newborns, and many require surgical correction within the first weeks or months of life. Saving the heart has always been the priority. But what happens to the brain?

A study from Children's National Hospital, published in JNeurosci, offers the most detailed look yet at how congenital heart disease reshapes the developing brain and how corrective surgery begins to reverse that process.

Altered wiring before surgery

Researchers Jung-Hoon Kim and Catherine Limperopoulos used functional magnetic resonance imaging (fMRI) to examine brain connectivity in newborns with congenital heart disease. They compared their scans to publicly available imaging data from healthy newborns.

The differences were clear. Babies with heart defects showed atypical patterns in brain networks associated with sensory perception, motor control, and social behavior. The regions were connected, but the patterns of communication between them diverged from what healthy brains typically show at the same developmental stage.

The likely explanation is straightforward: congenital heart disease alters blood flow and oxygen delivery to the brain during a period of rapid neural development. The brain builds its networks with whatever resources are available, and when those resources are compromised, the architecture reflects it.

What surgery changes

The more striking finding came from post-surgical imaging. After corrective cardiovascular surgery, the brain networks of babies with heart defects shifted toward patterns that more closely resembled those of healthy newborns. The wiring was not fully normalized, but the direction of change was consistent and encouraging.

As Limperopoulos explained, the pre-surgical differences likely reflect altered oxygen and blood flow to the brain. Once surgery restores more normal circulation, the brain appears to begin reorganizing its connections. This suggests that at least some of the neural disruption caused by congenital heart disease is reversible, particularly when corrected early.

Toward surgical timing and targeted intervention

The clinical implications are potentially significant. If brain imaging can identify which neural networks are most affected in individual patients, it could help guide the timing of surgery. Limperopoulos suggested that brain-based biomarkers might help determine the optimal window for intervention, when surgery would produce the greatest benefit for both cardiac and neurological outcomes.

There is also the possibility of identifying subsets of infants who do not show neural recovery after surgery. These patients might benefit from targeted neurodevelopmental interventions, rehabilitation approaches tailored to the specific networks that remain disrupted.

Kim noted that fMRI can identify brain networks vulnerable to altered blood flow, which could guide both surgical planning and post-operative care. The technology exists; the question is whether it can be integrated into clinical practice in a way that is practical and cost-effective.

Limitations and open questions

The study used advanced analytical techniques that go beyond conventional neuroimaging tools, which Limperopoulos acknowledged have struggled to detect the subtle network-level changes associated with congenital heart disease. This methodological strength is also a limitation: the approach requires specialized expertise and may not be readily available at all medical centers.

The sample size was not specified in the press materials, and the degree of post-surgical improvement may vary depending on the type and severity of heart defect, the timing of surgery, and individual patient factors. Longer-term follow-up studies will be needed to determine whether the neural improvements observed shortly after surgery persist through childhood and translate into better developmental outcomes.

Children with congenital heart disease are known to be at elevated risk for neurodevelopmental disabilities as they grow, including difficulties with attention, learning, and social skills. Whether early brain network assessment can predict which children will face these challenges, and whether targeted interventions can prevent them, remains an open and urgent question.