Auditory brainstem function in microcephaly related to Zika virus infection

Area of Science:

• Neurology
• Virology
• Pediatrics

Background:

• Prenatal Zika virus (ZV) infection is linked to microcephaly.
• The impact of ZV on developing brainstem function requires further investigation.

Purpose of the Study:

• To evaluate the effect of prenatal ZV infection on brainstem function using brainstem auditory evoked potentials (BAEPs) in infants with microcephaly.

Main Methods:

• A cross-sectional study involving 19 infants (12 girls) with ZV-related microcephaly (12-62 weeks old).
• Brainstem function assessed via BAEPs, analyzing wave I, III, and V latencies.
• Latencies were standardized, compared to normative data, and correlated with age and cephalic perimeter.

Main Results:

• Most infants exhibited clear BAEP waveforms within normal limits.
• Statistically significant increases in wave I and III latencies were observed relative to wave V.
• Wave I latency showed a positive correlation with chronological age, but wave latencies were independent of cephalic perimeter.

Conclusions:

• The brainstem auditory evoked potentials (BAEPs) suggest functional normality of the brainstem structure in infants with ZV-related microcephaly.
• The findings indicate that ZV infection likely disrupts neuronal migration and differentiation in the telencephalon, rather than the cell proliferation phase.
• Brainstem function appears largely preserved despite prenatal ZV exposure and resulting microcephaly.