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Spontaneous eye blinking, a measure of dopaminergic function, in children with acquired immunodeficiency syndrome
H Vreugdenhil1, P Brouwers, P Wolters
1HIV and AIDS Malignancy Branch, National Cancer Institute, Bethesda, Md., USA.
Insights
Children with acquired immunodeficiency syndrome (AIDS) and brain abnormalities show higher spontaneous eye blink rates, indicating increased central dopamine activity. This suggests neurotransmitter level variations in AIDS impacting socioemotional functioning.
Area of Science:
- Neuroscience
- Pediatrics
- Infectious Diseases
Background:
- Acquired immunodeficiency syndrome (AIDS) can affect central nervous system function.
- Dopaminergic pathways are crucial for motor control, cognition, and socioemotional regulation.
- Spontaneous eye blink rate is a non-invasive measure of central dopaminergic activity.
Purpose of the Study:
- To investigate dopaminergic function alterations in children with AIDS.
- To correlate spontaneous eye blink rate with neuroimaging findings and socioemotional status in pediatric AIDS.
- To explore the impact of structural brain abnormalities on neurotransmitter levels.
Main Methods:
- Analysis of videotaped test sessions from 50 children (mean age 5.2 years) with AIDS.
- Evaluation of spontaneous eye blink rate as a measure of dopaminergic function.
- Correlation of blink rates with computed tomographic (CT) brain scan data (cortical atrophy, white matter abnormality, basal ganglia calcifications) and observed affect/behavior.
Main Results:
- Higher spontaneous eye blink rates were observed in children with AIDS.
- Increased blink rates correlated with more severe cortical atrophy and white matter abnormalities on CT scans (P < .05).
- Higher blink rates were associated with depressed affect and lower ratings of hyperactivity (P < .05).
Conclusions:
- Children with AIDS and significant cortical abnormalities exhibit heightened central dopamine activity.
- Structural brain damage in pediatric AIDS may lead to variable neurotransmitter levels.
- These neurochemical changes may manifest in altered socioemotional functioning in children with AIDS.
Objective:
To investigate possible alterations in dopaminergic function in children with acquired immunodeficiency syndrome by evaluating spontaneous eye blink rate, a putative measure of central dopaminergic function.
Design:
Evaluation of previously videotaped test sessions of a consecutive case series of 50 children (mean age, 5.2 years; range, 2-12 years) with acquired immunodeficiency syndrome.
Setting:
Government medical research center.
Results:
Intrarater reliability was high, expected co-variation of blink rate with age and concurrent mental activity were confirmed, and obtained rates were similar to published data. Higher blink rates, suggestive of increased dopaminergic function, were associated with more severe cortical atrophy (P < .05) and white matter abnormality (P < .05) on computed tomographic brain scans. The presence or severity of basal ganglia calcifications did not seem to influence blink rate. In addition, higher blink rates were associated with higher ratings of depressed affect (P < .05) and lower ratings of hyperactive behaviors (P < .05) during other test activities.
Conclusions:
The higher blink rates in human immunodeficiency virus-infected children with more severe cortical abnormalities suggest increased central dopamine activity compared with that in children without cortical computed tomographic brain scan abnormalities. Thus, as a result of structural brain abnormalities, neurotransmitter levels in children with acquired immunodeficiency syndrome may vary and this may be reflected in their socioemotional functioning.