Cerebral structure and metabolism and long-term outcome in small-for-gestational-age preterm neonates

Area of Science:

• Neuroscience
• Developmental Biology
• Pediatric Imaging

Background:

• Intrauterine growth restriction (IUGR) in small-for-gestational-age (SGA) infants may impact brain development and long-term neurodevelopmental outcomes.
• Placental insufficiency is a common cause of IUGR, potentially leading to altered cerebral metabolism.
• Early detection and understanding of brain changes in SGA infants are crucial for predicting neurodevelopmental trajectories.

Purpose of the Study:

• To compare brain development and cerebral metabolism in preterm small-for-gestational-age (SGA) versus appropriate-for-gestational-age (AGA) infants.
• To investigate the hypothesis that intrauterine growth retardation is associated with altered brain metabolism and adverse neurodevelopmental outcomes.
• To assess neurodevelopmental quotients (DQ) at 2 years corrected age in relation to in-utero growth status.

Main Methods:

• Proton magnetic resonance spectroscopy ((1)H-MRS) and magnetic resonance imaging (MRI) were used to assess brain structure and metabolism.
• Metabolic ratios (NAA/Cho, lactate/Cho, mI/Cho, Glx/Cho) were measured in basal ganglia and periventricular white matter at 32 and 41 weeks postmenstrual age.
• Griffiths' developmental quotient (DQ) was evaluated at 24 months corrected age.

Main Results:

• No significant differences were observed in brain development (MRI) or cerebral metabolic ratios between SGA and AGA preterm infants.
• Griffiths' DQ scores at 24 months corrected age did not differ significantly between the SGA and AGA groups.
• Both groups showed developmental changes over time, with increasing NAA/Cho and decreasing mI/Cho ratios, but without intergroup differences.

Conclusions:

• Severely SGA preterm infants did not exhibit significant differences in cerebral metabolism or brain development compared to AGA infants at term-equivalent age.
• Neurodevelopmental outcomes at 2 years corrected age were comparable between SGA and AGA preterm infants in this cohort.
• Intrauterine growth restriction, in the absence of major ultrasound abnormalities, did not appear to lead to detectable differences in brain metabolism or development by 2 years of age.