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Very preterm children with fetal growth restriction demonstrated altered white matter maturation at nine years of age.

Acta Paediatrica 2017 October
AIM: This study evaluated the role of preterm birth and fetal growth restriction on white matter maturation in schoolchildren without any severe neurodevelopmental impairment.

METHODS: The study group comprised 56 very preterm children and 21 term children born between November 1998 and November 2002 at Oulu University Hospital, Finland. The mean gestational age of the preterm children was 28.7 (24.1-31.9) weeks. All children underwent diffusion tensor imaging at a mean age of 9.0 (8.6-9.6) years. Voxel-wise statistical analyses of the imaging data were carried out using tract-based spatial statistics.

RESULTS: Preterm children with fetal growth restriction had lower fractional anisotropy and higher radial diffusivity than term controls (p < 0.05), bilaterally in several white matter areas. Preterm children without fetal growth restriction had higher mean diffusivity and axial diffusivity than term controls (p < 0.05) in analogous areas, but more asymmetrically.

CONCLUSION: Preterm children had microstructural differences in white matter, compared to term-born children at a mean age of nine, and those with poor fetal growth showed widespread changes in white matter maturation compared to term-born children. Fetal growth and prematurity seemed to affect white matter maturation in a way that was still visible at that age.

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