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Precocial neural function in the growth-retarded fetal lamb
C J Cook1, P D Gluckman, C Williams
1Department of Pediatrics, University of Auckland, New Zealand.
Pediatric Research
|November 1, 1988
Summary
Growth-retarded fetuses show advanced neurological development. This study in fetal lambs found that fetal growth restriction is linked to precocious neurological maturation in utero.
Area of Science:
- Neuroscience
- Developmental Biology
- Perinatology
Background:
- Clinical observations suggest neurological precocity in growth-retarded premature infants.
- The underlying mechanisms for this paradoxical finding remain unclear.
Purpose of the Study:
- To investigate the association between fetal growth retardation and neurological maturation in a fetal lamb model.
- To examine somatosensory and brainstem auditory-evoked potentials in growth-retarded fetuses.
Main Methods:
- Chronic instrumentation of fetal lambs in late gestation.
- Induction of growth retardation via preconception uterine carunclectomy.
- Recording of somatosensory-evoked potentials (SEPs) and brainstem auditory-evoked potentials (BAEPs).
Main Results:
- Growth-retarded fetuses (≥2 SD below mean weight) exhibited earlier appearing BAEP components (p<0.05).
- Shorter latencies were observed for multiple SEP (N20, P/N 30, P200) and BAEP (I, III, IV, V) waveforms in growth-retarded fetuses.
- Growth-retarded fetuses demonstrated enhanced ability to follow increasing stimulus rates, indicating precocial maturation.
Conclusions:
- Fetal growth restriction is associated with precocious neurological maturation in utero.
- This finding provides a potential explanation for the observed neurological advancements in growth-retarded infants.