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Fetal brain sparing is associated with accelerated shortening of visual evoked potential latencies during early
S A Scherjon1, H Oosting, B W de Visser
1Graduate School Neurosciences Amsterdam, Department of Obstetrics and Gynaecology, The Netherlands.
Insights
Severe fetal growth restriction may accelerate brain myelination in infants. This adaptive process, indicated by specific Doppler ultrasonography ratios, shows faster neurophysiologic maturation in affected newborns.
Area of Science:
- Neuroscience
- Developmental Biology
- Neonatal Medicine
Background:
- Fetal growth restriction (FGR) due to placental insufficiency impacts fetal development.
- Adaptive strategies, like fetal haemodynamic centralization, occur in response to FGR.
- Brain myelination is a critical process for neurodevelopment.
Purpose of the Study:
- To investigate the impact of fetal growth restriction on the myelination of the developing brain.
- To assess if fetal hemodynamic changes associated with FGR influence brain maturation.
- To correlate specific Doppler indices with markers of brain myelination.
Main Methods:
- Doppler ultrasonography was used to assess fetal haemodynamic centralization, calculating the umbilical artery/cerebral artery pulsatility index ratio.
- Visual evoked potentials (VEPs) were recorded in 105 neonates at 6 months and 1 year corrected age.
- Statistical analyses controlled for confounders including gestational age, head circumference, and cranial ultrasonography findings.
Main Results:
- Infants with a raised umbilical artery/cerebral artery pulsatility index ratio (indicating severe FGR) exhibited shorter VEP latencies at 6 months.
- These infants did not show the typical postnatal maturational shortening of VEP latencies observed in normally grown infants.
- The findings suggest an accelerated neurophysiologic maturation in severely growth-restricted neonates.
Conclusions:
- Severe fetal growth restriction may induce an accelerated neurophysiologic maturation.
- This accelerated maturation may represent a beneficial adaptive response to the challenges of FGR.
- Further research is needed to understand the long-term implications of this adaptive process.
Objective:
Our purpose was to assess the effects that fetal growth restriction exerts on the myelination of the developing brain.
Study Design:
Fetal haemodynamic centralization, an adaptive strategy to growth restriction caused by placental insufficiency, was determined by Doppler ultrasonography. Infants with a raised ratio between umbilical artery pulsatility index and cerebral artery pulsatility index are severely growth restricted. Visual evoked potentials give information on the degree of brain myelination. Shortening of visual evoked potential latencies is a normal feature of myelination. In a consecutive series of 105 Neonates, visual evoked potentials were recorded at the corrected ages of 6 months and 1 years. Correction for possible confounders, such as cranial ultrasonographic findings, gestational age, and head circumference, was performed.
Results:
At 6 months, infants with a raised umbilical artery/cerebral artery pulsatility index ratio have shorter visual evoked potential latencies. Opposite of neonates with a normal umbilical artery/cerebral artery ratio, they show no postnatal maturational shortening of visual evoked potential latencies.
Conclusion:
Accelerated neurophysiologic maturation, found in infants with a high umbilical artery/cerebral artery ratio, might be the result of a beneficial adaptive process to severe fetal growth restriction.