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The Relationship Between Clinical Imaging and Neurobehavioral Assessment in Posthemorrhagic Ventricular Dilation of
Rebecca A Dorner1,2, Bruno P Soares2,3, Shenandoah Robinson2,4
1Neonatology, Johns Hopkins Hospital, Baltimore, MD, United States.
Insights
Neonatal intraventricular hemorrhage (IVH) and hydrocephalus in preterm infants are linked to neurodevelopmental issues. Neuroimaging and the NICU Network Neurobehavioral Scale (NNNS) show correlations between ventricle size, brain injury, and infant neurobehavioral deficits.
Area of Science:
- Neonatal neurology
- Pediatric neurosurgery
- Developmental neuroscience
Background:
- Neonatal intraventricular hemorrhage (IVH) and posthemorrhagic hydrocephalus in preterm infants can lead to significant brain injury and neurodevelopmental impairments.
- Neuroimaging techniques like head ultrasound (HUS) and magnetic resonance imaging (MRI) are crucial for assessing cerebral injury and guiding interventions.
- The NICU Network Neurobehavioral Scale (NNNS) offers a reliable method to evaluate motor and cognitive development in neonates.
Purpose of the Study:
- To investigate the relationship between neonatal neurobehavioral outcomes measured by the NNNS and imaging parameters of ventricular dilation and brain injury on HUS and MRI.
- To determine if neuroimaging findings correlate with neurobehavioral assessments in preterm infants with IVH and hydrocephalus.
Main Methods:
- Enrollment of preterm neonates diagnosed with IVH and ventricular dilatation, with or without posthemorrhagic hydrocephalus.
- Performance of NNNS exams at approximately term-equivalent age.
- Measurement of HUS indices and assessment of the posterior fossa via MRI at term; correlation analysis using Pearson's method.
Main Results:
- Significant correlations were found between ventricle size, brain injury markers, and NNNS scores.
- Higher ventricle/brain ratios and poorer NNNS habituation scores were observed in infants requiring neurosurgical intervention.
- Ventricle size showed modest correlations with motor abnormalities (e.g., reflexes, tone) and cognitive scores (e.g., attention); periventricular hemorrhagic infarction correlated with poorer habituation.
Conclusions:
- Neurosurgical intervention for posthemorrhagic hydrocephalus in preterm infants is associated with greater ventriculomegaly and poorer NNNS outcomes.
- HUS and MRI findings correlate with motor and cognitive deficits identified through neonatal neurobehavioral examinations.
- The NNNS exam provides valuable supplementary information for assessing preterm infants with IVH-related ventricular dilation and hydrocephalus.
Abstract:
Introduction: Neonatal intraventricular hemorrhage (IVH) and subsequent posthemorrhagic ventricular dilation and hydrocephalus of prematurity are associated with brain injury and neurodevelopmental impairment in the preterm population. Neuroimaging assesses cerebral injury and guides neurosurgical intervention; however, the relationship of head ultrasound (HUS) and magnetic resonance imaging (MRI) parameters to neonatal exams in this group has not been well described. The NICU Network Neurobehavioral Scale (NNNS) is a reproducible, highly reliable battery with motor and cognitive domain scores. Objective: To evaluate the relationship between neonatal neurobehavioral findings on the NNNS and measures of ventricular dilation and associated brain injury on HUS and MRI. Materials and Methods: Neonates with IVH and ventricular dilatation with and without posthemorrhagic hydrocephalus were enrolled. NNNS exams were performed at approximately term age equivalent. HUS indices were measured on the last HUS before initial neurosurgical procedure or that with worst ventriculomegaly if no intervention. The posterior fossa was assessed with MRI at term. Descriptive statistics including medians, interquartile ranges, means, and percentages were performed. Correlations were estimated using Pearson's method. Results: 28 patients had NNNS and HUS, and 18 patients also had an MRI. Ventricle size measures for the cohort were significantly above normal. Motor and cognitive subscores on the NNNS exam varied from established baseline scores for postmenstrual age. Children who required neurosurgical intervention had higher ventricle/brain ratios and worse NNNS habituation scores. Ventricle sizes were modestly correlated with motor abnormalities (0.24-0.59); larger anterior horn width correlated with nonoptimal reflexes, hypertonicity and hypotonicity. Ventricle sizes were modestly correlated with cognitive scores (-0.44 to 0.27); larger ventricular index correlated with worse attention. Periventricular hemorrhagic infarction correlated with worse habituation. Conclusion: For this cohort of preterm infants with IVH, surgical intervention for posthemorrhagic hydrocephalus correlated with both larger degrees of ventriculomegaly and worse NNNS exams. Findings on both HUS and MRI correlated with motor and cognitive abnormalities on neonatal neurobehavioral exam, suggesting that larger neonatal ventricle sizes and white matter injury have detectable correlates on exam. The NNNS exam provides important additional information when assessing posthemorrhagic ventricular dilation and hydrocephalus of prematurity.
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