Visual evoked potentials in hydrocephalus: relationship to head size, shunting, and mental development
Related Experiment Videos
Insights
Visual evoked potentials (VEPs) in hydrocephalus reveal delayed P2 latency in infants, especially with enlarged heads or infection. Normal VEPs are possible with shunting and normal development, but cognitive delays persist.
Area of Science:
- Neuroscience
- Pediatrics
- Ophthalmology
Background:
- Hydrocephalus significantly impacts brain development and function in infants and children.
- Visual evoked potentials (VEPs) are crucial for assessing visual pathway integrity.
- Understanding VEP changes in hydrocephalus can inform prognosis and management.
Purpose of the Study:
- To investigate visual evoked potentials (VEPs) in infants and children with hydrocephalus.
- To correlate VEP maturation with hydrocephalus severity, head size, mental development, and infection.
- To evaluate the effect of shunting on VEPs in hydrocephalic patients.
Main Methods:
- Measured flash-evoked visual cortical potentials in 54 symptomatic hydrocephalic, 54 shunted asymptomatic hydrocephalic, and 57 control infants and children.
- Assessed head size, mental development, and history of central nervous system infection for all participants.
- Analyzed latency to the P2 (P100) peak of the VEPs.
Main Results:
- Hydrocephalic infants (<60 weeks conceptual age) showed altered P2 latency maturation, particularly with enlarged heads or infection.
- Older children with acute hydrocephalus and normal development had normal P2 latencies.
- Persistent ventriculomegaly post-shunting was compatible with normal VEPs; shunting normalized P2 latency in most with normal mental development.
Conclusions:
- VEP maturation is significantly affected by hydrocephalus in early infancy, influenced by head size and infection.
- Normal mental development and shunting can lead to normalized VEPs in hydrocephalic children.
- Cognitive impairment in hydrocephalic children is associated with persistent VEP abnormalities regardless of shunting or age.
Abstract:
Flash-evoked visual cortical potentials were measured in 54 infants and children with symptomatic hydrocephalus; 54 shunted, asymptomatic infants and children; and 57 controls. All patients were evaluated for head size, mental development, and history of infection of the nervous system. Hydrocephalic infants up to 60 weeks of conceptional age showed significant changes in the maturation curve of the latency to the main positive peak P2 (P100), particularly when their hydrocephalus was associated with an enlarged head or with infection. Older children of normal mental development presenting with acute hydrocephalus of recent onset had normal latencies to P2. Some persistent ventriculomegaly after shunting was also compatible with normal visual evoked potentials (VEPs). After shunting, the latency to P2 became normal in most of the patients who showed normal mental development, whereas retarded hydrocephalic children of all ages continued to have abnormal VEPs.