Internalizing disorders typically include anxiety and depressive symptoms, often expressed inwardly rather than through outward behavioral disruption. In HIE survivors, these emotional patterns may be influenced by neurobiological changes tied to injury severity, early brain network disruption, and developmental timing. The review synthesizes evidence about how such disorders may develop over childhood and adolescence, raising concerns that routine follow-up may not adequately capture mental health needs.

The scoping approach matters. Rather than testing one narrow hypothesis, scoping reviews map the landscape of existing research, identifying common themes, gaps, and inconsistencies in how internalizing outcomes are measured. That is particularly important in neonatal HIE studies, where follow-up times, assessment tools, and participant characteristics can vary widely. The result is a more realistic picture of what clinicians and families can expect—and what remains unknown.

Across the included literature, the review underscores that emotional health is likely part of the broader neurodevelopmental picture. Survivors may show vulnerability that aligns with broader cognitive and motor sequelae reported in earlier work, suggesting shared pathways linking early injury to later self-regulation and stress processing.

Another striking point is the potential mismatch between physical recovery and mental outcomes. Families may see a child improve medically, yet subtle anxiety, withdrawal, or persistent sadness may appear later, especially when school demands increase and social pressures become more salient. These symptoms can be misattributed to personality, temperament, or “normal” developmental phases.

The viral takeaway is simple: brain injury at birth doesn’t end at discharge. The review calls for mental health screening and structured monitoring that extends beyond standard developmental assessments. It also points to the need for clearer definitions and consistent outcome measures, so that future studies can quantify risks more precisely.

While the review cannot replace targeted clinical trials, its mapping of the evidence is a starting gun for the next research wave. If researchers can standardize assessments and track outcomes longitudinally, clinicians may move from reactive support to earlier, preventive intervention.

The work is indexed in Journal of Perinatology under DOI: 10.1038/s41372-026-02834-3.

Subject of Research: Internalizing disorders in survivors of neonatal hypoxic ischemic encephalopathy (HIE)
Article Title: Silent struggles of internalizing disorders in survivors of neonatal hypoxic ischemic encephalopathy: a scoping review
Article References: Yabalar, N., Isik, I., Aycan, N. et al. (2026) Journal of Perinatology. https://doi.org/10.1038/s41372-026-02834-3
Image Credits: AI Generated
DOI: 10.1038/s41372-026-02834-3
Keywords:

The work focuses on infants born at or before 28 weeks’ gestation, a group especially vulnerable to fragile brain vasculature. In this early window, even routine resuscitation and respiratory management can influence physiological stability. The team therefore examined whether procedural difficulty—reflected by repeated laryngoscopy—correlates with subsequent severe IVH.

Technically, laryngoscopy is used to visualize the airway and support endotracheal intubation when needed. Each additional attempt may prolong exposure to factors such as fluctuating oxygenation, changing carbon dioxide levels, and transient cardiovascular stress. These perturbations are thought to affect cerebral blood flow regulation, which is already immature in very preterm babies.

To evaluate the association, investigators analyzed clinical data from extreme preterm infants, comparing the frequency of laryngoscopic attempts with outcomes related to IVH severity. The primary endpoint was severe IVH, indicating bleeding patterns that are clinically critical and associated with higher morbidity.

The findings suggest that the number of LAs is not a neutral byproduct of care, but may function as a measurable marker of procedural strain and airway-related instability. While observational designs cannot prove causality on their own, the strength and direction of the association raise important questions about how to optimize intubation strategies during this high-risk phase.

The study’s implications extend beyond documentation: if repeated laryngoscopy increases risk, then interventions aimed at improving first-attempt success—such as enhanced training, decision support, equipment optimization, and refined airway algorithms—could potentially reduce severe brain bleeding.

For clinicians, the message is practical: minimizing attempts may matter as much as the decision to intubate, particularly in the most premature patients. The authors emphasize the need for further research to clarify mechanisms and to test whether targeted improvements in intubation workflows can prevent IVH.

Overall, the report adds a new procedural dimension to neonatal risk monitoring, aligning airway management closely with neuroprotective outcomes in the earliest moments of life.

Subject of Research: Association between laryngoscopic attempt number and severe intraventricular hemorrhage in extreme preterm infants.

Article Title: Association of number of laryngoscopic attempts during the transitional period and severe intraventricular hemorrhage in extreme preterm infants.

Article References: Bait Raidan, H., Mohsen, N., Elhanefy, T. et al. Association of number of laryngoscopic attempts during the transitional period and severe intraventricular hemorrhage in extreme preterm infants. J Perinatol (2026). https://doi.org/10.1038/s41372-026-02811-w

DOI: https://doi.org/10.1038/s41372-026-02811-w

Image Credits: AI Generated

Keywords: Laryngoscopic attempts; laryngoscopy; intraventricular hemorrhage; severe IVH; extreme preterm infants; transitional period; neonatal intubation.

Hypoxic-ischemic brain injury occurs when a critical reduction in oxygen and blood flow causes cellular and tissue damage, triggering pathological cascades that include oxidative stress, excitotoxicity, and inflammation. Neutrophils, a subset of innate immune cells typically involved in microbial defense, are now recognized to play dual roles in this scenario. The study by Richter and colleagues meticulously delineates this duality by demonstrating that following neonatal hypoxia-ischemia, neutrophils are not a homogenous population; rather, two distinct subpopulations emerge sequentially, each exerting contrasting effects on the injured brain milieu.

The research utilized a well-established murine model of neonatal hypoxic-ischemic brain injury, allowing the temporal dissection of immune responses within the immature neural environment. Using advanced flow cytometry, transcriptomics, and immunohistochemistry techniques, the team tracked neutrophil dynamics at multiple post-injury time points. Early after injury, neutrophils infiltrating the brain exhibited a predominantly pro-inflammatory phenotype characterized by high expression of reactive oxygen species (ROS) and elevated production of inflammatory cytokines. This initial wave actively contributed to exacerbating neuronal damage and amplifying local inflammation.

Interestingly, a second wave of neutrophils appeared later, marked by anti-inflammatory and reparative characteristics. This population showed enhanced expression of factors involved in tissue remodeling and resolution of inflammation, such as arginase-1 and transforming growth factor-beta (TGF-β). It implies a built-in regulatory mechanism within the innate immune response, where neutrophils adopt a dichotomous phenotype—first amplifying injury, then facilitating repair. This temporal plasticity challenges the traditional view of neutrophils solely as deleterious agents and highlights their multifaceted role in neonatal brain injury.

Further molecular analysis revealed that the microenvironment of the injured brain critically influences this phenotypic switch. Hypoxia-inducible factors (HIFs) and cytokine gradients sculpt the neutrophil functional states, suggesting that targeting these pathways might modulate neutrophil actions therapeutically. For example, modulating HIF signaling could feasibly encourage earlier transition to the reparative phenotype, potentially mitigating long-term neurological deficits by dampening inflammation-driven tissue destruction.

The implications of these findings are profound for clinical translation. Current therapeutic options for neonatal HIE, such as therapeutic hypothermia, offer limited efficacy and do not address the underlying immune dysregulation. By identifying distinct neutrophil populations with divergent functions, Richter et al. propose that selective manipulation of these subtypes could become a viable immunotherapeutic strategy. This could involve suppressing the initial harmful neutrophil infiltration or promoting the later beneficial reparative neutrophils, thereby harnessing the immune system’s inherent capabilities to optimize brain repair.

Moreover, the study underscores the importance of temporal precision in immune interventions. Any therapeutic approach must consider the dynamic shifts in neutrophil phenotypes over the post-injury timeline to avoid counterproductive outcomes. For instance, indiscriminate depletion of neutrophils could hinder repair processes if reparative neutrophils are also eliminated. Hence, precise biomarkers distinguishing neutrophil subsets are essential for developing targeted therapeutics.

This research also adds a new layer to our fundamental understanding of neuroimmune interactions in the neonatal brain. It highlights the complexity of immune cell plasticity and the delicate balance between inflammation and repair necessary for proper recovery after injury. By leveraging such insights, future studies can explore combinatorial treatments pairing immune modulation with neuroprotective agents, aiming for synergistic enhancement of brain resilience and regeneration.

Additionally, these findings could influence investigations into other neuroinflammatory conditions observed in the developing brain, extending beyond hypoxic-ischemic injury. Disorders such as neonatal stroke, infection-induced brain injury, and certain neurodevelopmental disorders may involve similar immune dynamics. The concept of dichotomous neutrophil function might thus be a unifying theme in various pediatric neuropathologies.

From a methodological standpoint, the multi-dimensional approach employed by Richter and colleagues—combining in vivo murine modeling with detailed phenotypic and transcriptional profiling—sets a new standard for studying immune responses in neonatal neuropathology. Their robust dataset enables a granular understanding of cellular mechanisms, paving the way for systems biology analyses integrating immune, neural, and metabolic pathways.

Importantly, the study advocates for future research focusing on how environmental and genetic factors influence neutrophil recruitment and phenotype switching in neonatal brain injury. Understanding inter-individual variability could help tailor personalized therapeutic interventions, improving prognostic accuracy and treatment efficacy. For example, predisposing genetic polymorphisms affecting immune regulation might render some infants more susceptible to detrimental neutrophil responses.

In conclusion, this pivotal study elucidates the dual and sequential roles of neutrophils during neonatal hypoxic-ischemic brain injury, with significant implications for therapeutic innovation. By revealing how the innate immune system transitions from damaging to healing phases via neutrophil phenotypic plasticity, the research offers promising avenues to mitigate neurological impairments in newborns. These insights underscore the evolving paradigm that immune cells are not mere bystanders but active participants shaping neurodevelopmental outcomes after injury.

As neonatal medicine continues to advance, integrating immunology with neuroscience will be key to unlocking novel treatments for complex brain injuries. The work of Richter et al. not only enriches scientific knowledge but also fuels hope for vulnerable infants and their families by moving closer to targeted, effective interventions that harness the body’s own defense mechanisms to promote neural recovery and long-term health.

Subject of Research: Neonatal hypoxic-ischemic brain injury and the role of neutrophil subpopulations in neuroinflammation and repair.

Article Title: Hypoxic-ischemic brain injury in neonatal mice sequentially recruits neutrophils with dichotomous phenotype and function.

Article References:
Richter, M., Diesterbeck, E., Pylaeva, E. et al. Hypoxic-ischemic brain injury in neonatal mice sequentially recruits neutrophils with dichotomous phenotype and function. Nat Commun 16, 9696 (2025). https://doi.org/10.1038/s41467-025-65517-1

Image Credits: AI Generated

DOI: https://doi.org/10.1038/s41467-025-65517-1

Neonatal encephalopathy is a complex syndrome that often results from hypoxic-ischemic events around the time of birth, leading to brain injury with lasting neurological consequences. Historically, assessing the extent of injury and likely outcomes has relied heavily on clinical examination and traditional magnetic resonance imaging (MRI) methods, which can sometimes be limited in sensitivity. The adoption of DKI in this arena marks a significant advancement because it can capture non-Gaussian water diffusion behavior, thereby revealing previously hidden microstructural details within brain tissue.

The investigators applied diffusional kurtosis imaging specifically to the white matter of neonates diagnosed with encephalopathy. This is crucial since white matter tracts are particularly susceptible to hypoxic-ischemic injury due to their high metabolic demand and developmental status during the neonatal period. DKI provides metrics such as mean kurtosis, axial kurtosis, and radial kurtosis, which correlate with tissue complexity and integrity beyond standard diffusion tensor imaging parameters. These more intricate measures allow a nuanced understanding of white matter alterations that accompany brain injury and repair processes.

By leveraging a cohort of neonates subjected to DKI scans shortly after injury and at follow-up stages, the study meticulously tracked changes in white matter microstructure that reflect injury severity. The robust imaging analysis revealed distinct kurtosis patterns that differentiate more severely affected infants from those with relatively milder impairment. This differentiation is essential for early prognostication and informed clinical decision-making, potentially guiding interventions in a timely manner to mitigate long-term disabilities.

The longitudinal aspect of this research is particularly striking. The authors demonstrated that DKI metrics evolve during the recovery phase, indicating that white matter displays dynamic reorganization and healing capabilities post-injury. Tracking these changes with high-resolution kurtosis imaging provides unprecedented insight into the brain’s resilience and plasticity in neonatal encephalopathy. Moreover, correlating imaging biomarkers with neurodevelopmental outcomes helped validate DKI’s predictive potential in real-world clinical contexts.

Such findings could revolutionize how neonatal brain injury severity is quantified. Traditional MRI methods often fail to capture subtle structural disruptions or misclassify regions of evolving injury. DKI’s sensitivity to microstructural complexity makes it an invaluable tool in delineating areas of injury that are not yet apparent morphologically, enabling earlier therapeutic interventions. This study underscores the importance of integrating advanced neuroimaging modalities into neonatal care frameworks to optimize diagnosis, prognosis, and ultimately, patient outcomes.

The implications for treatment monitoring are equally significant. Emerging neuroprotective therapies, such as therapeutic hypothermia and pharmacological agents, require rigorous assessment of efficacy in neonatal populations. The ability of diffusional kurtosis imaging to non-invasively and quantitatively monitor white matter recovery permits clinicians and researchers to evaluate treatment responses objectively, hastening the refinement of therapeutic protocols and improving individualized care pathways.

Moreover, the researchers highlight the compatibility of DKI with standard neonatal MRI protocols, which means this technique can be feasibly incorporated into existing clinical imaging workflows. This pragmatic approach is likely to accelerate adoption in neonatal intensive care units, where early and accurate brain injury assessment is critical. The translational potential of this imaging innovation could reshape current paradigms and make sophisticated neonatal brain monitoring more accessible worldwide.

Insights from this study also open new avenues for basic neuroscience research regarding white matter development and injury mechanisms. Understanding how diffusional kurtosis relates to underlying histopathological changes enriches our comprehension of neonatal brain vulnerability and repair. This could inspire future investigations aimed at identifying molecular targets for neuroprotection and regeneration during the most fragile stages of brain maturation.

Further research prompted by these findings will hopefully expand the applicability of DKI beyond neonatal encephalopathy. The technique’s sensitivity to microstructural tissue changes might prove invaluable across a spectrum of pediatric neurological disorders marked by white matter abnormalities, such as cerebral palsy or periventricular leukomalacia. This pioneering work sets the stage for harnessing advanced diffusion imaging to revolutionize brain health assessment in children.

The study’s rigorous methodology and multi-disciplinary collaboration between neuroradiologists, neonatologists, and neuroscientists contributed to a rich dataset allowing comprehensive analysis. The integration of clinical, imaging, and outcome data strengthens the validity of conclusions drawn, making a powerful case for DKI as a front-line diagnostic and monitoring tool. This represents an exemplary model for translational biomedical research where technological innovation directly meets clinical need.

Looking ahead, incorporating artificial intelligence and machine learning with DKI datasets could further enhance sensitivity and predictive capabilities. Automated image processing and pattern recognition may enable rapid, standardized assessments, reducing inter-observer variability and speeding up clinical workflows. Such integrative approaches promise a future where neonatal brain injury assessment is not only more accurate but also more efficient and accessible.

In conclusion, Moss and colleagues’ landmark study establishes diffusional kurtosis imaging as a cutting-edge method to evaluate white matter injury severity and recovery in neonatal encephalopathy. Its ability to reveal microstructural abnormalities beyond conventional imaging holds promise to improve early diagnosis, inform prognosis, and guide therapeutic interventions. This advancement stands to significantly elevate care standards for affected newborns and inspire further innovations in neonatal neuroimaging and treatment.

The impact of this research resonates beyond neonatal care, emphasizing the value of sophisticated quantitative imaging in unraveling the complexities of brain injury and repair. Such tools are key to unlocking new frontiers in understanding human neurodevelopmental disorders and enhancing long-term neurological health outcomes. With widespread adoption, diffusional kurtosis imaging may soon become a standard bearer for precision medicine in neonatal neurology, transforming lives by enabling clinicians to better see, understand, and treat early brain injury.

Subject of Research: Neonatal encephalopathy; white matter injury assessment; brain microstructure; diffusional kurtosis imaging.

Article Title: Neonatal encephalopathy: a diffusional kurtosis imaging analysis of white matter to assess injury severity and recovery.

Article References:
Moss, H.G., Yazdani, M., Jensen, J.H. et al. Neonatal encephalopathy: a diffusional kurtosis imaging analysis of white matter to assess injury severity and recovery. Pediatr Res (2025). https://doi.org/10.1038/s41390-025-04434-x

Image Credits: AI Generated

DOI: https://doi.org/10.1038/s41390-025-04434-x

Complex CHD encompasses a heterogeneous group of structural heart defects that severely compromise cardiac function from birth. These defects often necessitate intricate surgical repairs within the first few days or weeks of life, during a period critical for brain development. Unfortunately, the physiological instability intrinsic to CHD—characterized by hypoperfusion, hypoxia, and fluctuating cerebral oxygenation—renders the neonatal brain exceptionally vulnerable to injury. Shi and colleagues emphasize the multifaceted mechanisms contributing to brain damage, including both preoperative hemodynamic disturbances and intraoperative factors, underscoring that neural insult is often established before any surgical intervention.

One pivotal aspect highlighted in their research is the role of chronic hypoxemia and altered cerebral blood flow patterns in predisposing neonates to white matter injury, a hallmark of neurodevelopmental impairment in this population. White matter consists of myelinated nerve fibers crucial for efficient neural communication, and its vulnerability in the developing brain correlates strongly with cognitive and motor deficits documented in infants surviving complex CHD. Diffusion tensor imaging (DTI) studies have revealed microstructural abnormalities in white matter tracts in neonates with CHD, often evident even prior to surgery. These findings suggest that brain injury is a prenatal or perinatal event, rather than exclusively iatrogenic.

The authors further explore the conundrum of neuroinflammation, a pathophysiologic process increasingly recognized for its contribution to ongoing neural damage post-surgery. The systemic inflammatory response induced by cardiopulmonary bypass, combined with ischemia-reperfusion injury, propagates a cascade of molecular events that exacerbates brain injury. Cytokine release, oxidative stress, and the activation of microglia amplify neuronal apoptosis, compromising the delicate balance necessary for normal brain maturation. Emerging biomarker research seeks to quantify these inflammatory signatures, potentially paving the way for targeted neuroprotective therapies.

Another dimension of the neurodevelopmental trajectory discussed is the impact of early surgical intervention timing on outcomes. While prompt repair is critical for survival and stabilization of cardiac function, it poses a paradox: surgery during a period of immature cerebral autoregulation increases the risk of additional brain injury. The authors report investigations into optimized perfusion strategies, including regional cerebral oxygen saturation monitoring, that strive to minimize intraoperative insults. Such advances reflect the delicate interplay between lifesaving cardiac procedures and preserving neurodevelopmental potential.

Shi and colleagues also scrutinize long-term developmental assessments that reveal a pattern of neurocognitive deficits manifesting during infancy and persisting into childhood. Studies consistently document impairments in executive function, language acquisition, motor coordination, and behavioral regulation in children with histories of complex CHD. These deficits often escape early detection, underscoring the necessity for systematic and prolonged neurodevelopmental surveillance to tailor interventions. The review discusses how early therapeutic strategies, including developmental therapies and cognitive rehabilitation, can ameliorate these outcomes but also cautions that standardized guidelines remain in their infancy.

Genetic and epigenetic factors emerge as critical yet underexplored determinants of both cardiac malformation and susceptibility to neurological injury. The authors point to inherited mutations and environmental modifiers that influence embryonic brain and cardiac development symbiotically. This genetic interplay may explain variability in outcomes among neonates with seemingly similar cardiac anatomies. Current research initiatives aim to integrate genomic profiling into risk stratification models, offering hope for precision medicine strategies that consider individual vulnerability to brain injury.

The paper does not shy away from addressing the socioeconomic and ethical challenges entailed in managing neurodevelopmental risks in this vulnerable population. Health disparities can compound access to early diagnostics, rehabilitative services, and long-term follow-up, disproportionately affecting families from under-resourced communities. Shi and colleagues advocate for the incorporation of multidisciplinary care teams, including cardiologists, neurologists, developmental pediatricians, and social workers, to ensure comprehensive support ecosystems. This holistic approach is vital for closing gaps in outcomes and maximizing quality of life.

Recent technological innovations are transforming the field, with advanced neuroimaging modalities becoming standard tools to detect and monitor brain injury in real-time. Functional MRI, near-infrared spectroscopy, and electroencephalography provide complementary insights into cerebral oxygenation, connectivity, and electrical activity. These technologies not only enhance diagnostic precision but also enable the tailoring of individualized perioperative care plans that prioritize cerebral protection. The authors stress the importance of collaborative research networks to validate these tools and integrate them into clinical pathways globally.

Furthermore, the discussion delves into experimental neuroprotective agents under investigation. Agents targeting oxidative stress, neuroinflammation, and excitotoxicity hold promise, though clinical translation remains challenging. The authors emphasize that combinational therapies, administered during key developmental windows, may provide synergistic benefits. Rigorous trials are necessary to balance efficacy with safety in this delicate population, but the potential to reduce the burden of neurodevelopmental disability invigorates ongoing research efforts.

Parental counseling and education also figure prominently in the care paradigm. Families facing complex CHD diagnoses must navigate overwhelming information and prognostic uncertainty. The authors point to emerging tools—including decision aids and structured communication protocols—that help deliver clear, empathetic guidance regarding neurological risks and developmental expectations. Empowering caregivers with knowledge is foundational to fostering engagement in follow-up care and early intervention programs.

Shi, Zhang, and Shu’s review culminates in a call for integrated approaches that bridge neonatal cardiac care with neurodevelopmental science. This synthesis requires collaborative frameworks combining clinical expertise, innovative research, and policy support. Essential to this endeavor is the establishment of standardized neurodevelopmental outcome measures and registries worldwide, enabling the aggregation of data necessary to refine care protocols and interventions systematically.

In conclusion, complex congenital heart disease in neonates represents a formidable clinical challenge extending well beyond the operating room. Brain injury occurring in the context of altered hemodynamics, surgical stress, and systemic inflammation shapes a neurodevelopmental trajectory that demands vigilant attention and comprehensive care strategies. The insights provided by Shi and colleagues not only illuminate current understandings but also chart a course toward mitigating neurological impairments in this vulnerable population through multidisciplinary, data-driven approaches. The future of neonatal cardiac care rests on the ability to safeguard the developing brain while curing the heart, a balance whose realization could transform long-term outcomes for thousands of children worldwide.

Subject of Research: Brain injury and neurodevelopmental trajectory in neonates with complex congenital heart disease

Article Title: Brain injury and neurodevelopmental trajectory in neonates with complex congenital heart disease: current status and challenges

Article References:
Shi, SS., Zhang, QN. & Shu, Q. Brain injury and neurodevelopmental trajectory in neonates with complex congenital heart disease: current status and challenges. World J Pediatr 21, 627–631 (2025). https://doi.org/10.1007/s12519-025-00948-w

Image Credits: AI Generated

DOI: https://doi.org/10.1007/s12519-025-00948-w