Structural and neurobehavioral delay in postnatal brain development of preterm infants

Area of Science:

• Neuroscience
• Developmental Biology
• Medical Imaging

Background:

• Premature birth can influence infant brain development.
• The early extrauterine environment may affect brain maturation.
• Understanding these effects is crucial for healthy infant development.

Purpose of the Study:

• To assess postnatal brain development in healthy prematurely born infants.
• To investigate the influence of premature birth and the extrauterine environment on brain structure, biochemistry, and function.
• To compare brain development in preterm infants at term-equivalent age with that of full-term infants.

Main Methods:

• In vivo magnetic resonance (MR) imaging (MRI) for myelination and gray/white matter differentiation.
• 1H MR spectroscopy (1H MRS) for cerebral metabolism (N-acetylaspartate concentration).
• Assessment of Preterm Infant's Behavior (APIB) for neurobehavioral parameters.

Main Results:

• Significant maturational changes observed in preterm infants from 2 weeks to term-equivalent age via MRI and 1H MRS.
• Preterm infants at term-equivalent age showed less gray/white matter differentiation and myelination compared to full-term infants.
• Preterm infants exhibited poorer performance in four neurobehavioral parameters: autonomic reactivity, motoric reactivity, state organization, and attentional availability.

Conclusions:

• MRI and 1H MRS are effective tools for studying postnatal brain development in preterm infants.
• Structural and biochemical maturation correlates with functional maturation in infant neurobehavior.
• Preterm infants demonstrate a structural and functional delay in brain development at 40 weeks postconception compared to full-term infants.