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Effect of delayed intermittent ventricular drainage on ventriculomegaly and neurological deficits in experimental
Ramin Eskandari1, Melissa Packer, Eric C Burdett
1Department of Neurosurgery, Division of Pediatric Neurosurgery, University of Utah, 175 N. Medical Drive East, Salt Lake City, UT 84132, USA.
Insights
Delayed ventricular reservoir placement in neonatal hydrocephalus may worsen outcomes. Early intervention is crucial for better structural development and functional results in infants with hydrocephalus.
Area of Science:
- Pediatric Neurosurgery
- Developmental Neuroscience
- Hydrocephalus Research
Background:
- Neonatal hydrocephalus management lacks clear guidelines for ventricular reservoir placement timing.
- Delayed intervention is common, potentially impacting neurodevelopmental outcomes.
- Early diagnosis and intervention are critical for managing pediatric hydrocephalus.
Purpose of the Study:
- To investigate the effects of early versus late ventricular reservoir placement on structural development and functional outcomes in a neonatal hydrocephalus model.
- To test the hypothesis that delayed ventricular drainage adversely affects outcomes in neonatal hydrocephalus.
- To inform clinical practice regarding optimal timing for intervention in pediatric hydrocephalus.
Main Methods:
- Utilized a kaolin-induced obstructive hydrocephalus animal model.
- Evaluated neurologic deficit following early (~1 week) or late (~2 weeks) ventricular reservoir implantation.
- Monitored ventriculomegaly progression and neurologic deficit scores (NDS) over time.
Main Results:
- Ventriculomegaly progression was similar between early and late reservoir groups.
- Animals receiving late reservoir placement showed higher average neurologic deficit scores.
- Neurologic deficit strongly correlated with ventricular enlargement severity in the early group, less so in the late group.
Conclusions:
- Current practice of delaying reservoir implantation until clinical signs appear may not be optimal.
- Early ventricular reservoir placement shows a stronger correlation between ventricular enlargement and neurologic deficit.
- Intervention timing significantly influences functional outcomes in neonatal hydrocephalus models.
Purpose:
Evidence-based guidelines do not indicate when ventricular reservoirs should be placed in children with neonatal hydrocephalus, and delayed intervention is common. We hypothesize that delayed ventricular drainage has adverse effects on structural development and functional outcomes.
Methods:
Using a well-established animal model of kaolin-induced obstructive hydrocephalus, we evaluated neurologic deficit after early (~1 week post-kaolin) or late (~2 weeks post-kaolin) placement of ventricular reservoirs which were tapped according to strict neurologic criteria.
Results:
Progressive ventriculomegaly was similar in early- and late-reservoir implantation groups. The average neurologic deficit scores (NDSs) over the experimental period were 0 (n=6), 2.74 (n=5), and 2.01 (n=3) for the control, early-, and late-reservoir groups, respectively. At reservoir placement, early-group animals displayed enlarged ventricles without neurologic deficits (mean NDS=0.17), while the late group displayed ventriculomegaly with clinical signs of hydrocephalus (mean NDS=3.13). The correlation between ventriculomegaly severity and NDS in the early group was strongly positive in the acute (before surgery to 3 weeks post-reservoir placement) (R(2)=0.65) and chronic (6 to 12 weeks post-reservoir placement) (R(2)=0.65) phases, while the late group was less correlated (acute R(2)=0.51; chronic R(2)=0.19).
Conclusions:
Current practice favors delaying reservoir implantation until signs of elevated intracranial pressure and neurologic deficit appear. Our results demonstrate that animals in early and late groups undergo the same course of ventriculomegaly. The findings also show that tapping reservoirs in these neonatal hydrocephalic animals based on neurologic deficit does not halt progressive ventricular enlargement and that neurologic deficit correlates strongly with ventricular enlargement.
