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Preterm infants with brain injury show altered cerebral blood flow (CBF), particularly in the thalamus and pons. These early hemodynamic disturbances highlight regional vulnerabilities in the developing brain.

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Area of Science:

  • Neuroscience
  • Neonatal Medicine
  • Medical Imaging

Background:

  • Systemic and cerebral hemodynamic disturbances are implicated in prematurity-related brain injury.
  • The precise impact of preterm birth on cerebral blood flow (CBF) remains incompletely understood.

Purpose of the Study:

  • To compare global and regional CBF in preterm infants with and without brain injury using arterial spin-labeling (ASL) MRI.
  • To investigate the relationship between clinical risk factors and CBF in this population.

Main Methods:

  • ASL MRI was performed on preterm infants (<32 weeks gestational age, <1500 g).
  • Global and regional CBF were quantified in specific brain regions (cerebral cortex, thalami, pons, cerebellum).
  • Infants were stratified by the presence and severity of brain injury.

Main Results:

  • Lower global CBF trended in preterm infants with brain injury (P = 0.07).
  • Regional CBF was significantly reduced in the right thalamus and midpons (P < 0.05) and trended lower in other regions in infants with brain injury.
  • Moderate-severe brain injury was associated with lower regional CBF in the midpons, right cerebellar hemisphere, and dentate nuclei compared to mild injury.
  • Lower regional CBF correlated with ventilation, sepsis, and cesarean delivery.

Conclusions:

  • Early disturbances in global and regional CBF are evident in preterm infants with brain injury.
  • Alterations in thalamic and pontine perfusion suggest regional vulnerability in developing cerebro-cerebellar circuitry.
  • ASL MRI can detect early hemodynamic changes associated with brain injury in preterm neonates.