Children infected with HIV are significantly more likely to do worse in neurological assessments despite having well-controlled HIV disease, according to new research.
The finding suggests that these children may struggle with cognitive and mental health issues.
However, early intervention—in the form of better nutrition and antiretroviral therapies—may help close the gap, the researchers report.
“HIV remains a major global health burden and children who are exposed to the virus during childbirth are known to be at greater risk for neurocognitive and psychiatric problems, like depression, as they age,” says David Bearden, assistant professor of neurology and pediatrics at the University of Rochester Medical Center and senior author of the study in the Journal of Acquired Immune Deficiency Syndromes.
“This research is an attempt to understand if these problems persist and become more pronounced over time, and whether we can predict who will do well cognitively and who will not.”
Since 1994, neurologist Gretchen Birbeck, has partnered with the government of Zambia and clinicians and researchers with the University Teaching Hospital (UTH) in Lusaka, Zambia to study neurological problems associated with infectious diseases like HIV and malaria, which remain major public health problems in sub-Saharan Africa.
The new findings come from the HIV-Associated Neurocognitive Disorders in Zambia (HANDZ) study, an ongoing longitudinal study that is following a cohort of 600 HIV positive and negative Zambian children ages 8 to 18 for five years.
With approximately 70% of global cases, HIV disproportionately affects sub-Saharan Africa. While combination antiretroviral therapy (cART) is widely accessible, many infected children still go on to experience associated neurocognitive and psychiatric deficits, such as delayed academic development and depression.
Researchers asked participants in the HANDZ study to complete a series of neurocognitive assessments, using an instrument called the NIH Toolbox Cognition Battery, which measures several cognitive processes, including processing speed, reaction time, memory, and executive function. They found that HIV positive children on cART did significantly worse on the cognitive measures at baseline and did not improve over the two-year study period, compared to their HIV negative peers.
The data suggests interventions that could improve neurological function. Children who were malnourished or who suffered more severe cases of HIV infection did worse on the assessments.
“These findings suggest that one of the most important thing that we can do is find kids with HIV early and get them on antiretroviral therapy, because if kids don’t get really sick from HIV, then they do much better cognitively,” says Bearden.
“The other key factor here is the nutritional piece and we’re doing more research to try to figure out exactly what kind of support could help improve cognition or prevent cognitive impairment in this population.”
Additional coauthors of the study are from the University of Zambia; the University Teaching Hospital, Lusaka; and the University of Rochester Medical Center.
The research received funding from the National Institute of Neurological Disorders and Stroke, the University of Rochester Center for AIDS Research, and the University of Rochester School of Medicine.
Source: University of Rochester