Cerebral blood-flow velocities in predicting outcome of asphyxiated newborn infants

Area of Science:

• Neonatal neurology
• Pediatric critical care
• Neurosonography

Background:

• Hypoxic-ischaemic encephalopathy (HIE) is a major cause of neonatal mortality and morbidity.
• Early prediction of HIE severity and long-term outcomes is crucial for timely intervention.
• Cerebral blood-flow (CBF) velocity may offer insights into brain injury in neonates.

Purpose of the Study:

• To assess the predictive value of early changes in cerebral blood-flow (CBF) velocity for HIE severity.
• To evaluate the role of CBF velocity in predicting long-term neurodevelopmental outcomes in asphyxiated term infants.
• To determine the optimal timing for using CBF velocity measurements in predicting HIE outcomes.

Main Methods:

• Colour Doppler ultrasonography was used to measure CBF velocities in term infants.
• Measurements were performed at least three times within the first 5 days of life.
• Infants' psychomotor development was followed up to 18 months.

Main Results:

• No significant differences in CBF velocities were observed between severe and mild-moderate HIE groups at 2-6 hours.
• By 12 hours, decreased anterior cerebral artery CBF velocity was noted in mild-moderate HIE and normal development groups.
• Increased CBF velocity in anterior, medial cerebral, and basilar arteries by 12 hours indicated severe HIE or poor outcomes.

Conclusions:

• Early CBF velocity changes (2-6 hours) have limited predictive value for HIE outcomes.
• The predictive value of CBF velocity for poor outcomes in asphyxiated infants increases by 12 hours of age.
• CBF velocity monitoring after 12 hours may aid in predicting neurodevelopmental trajectories in HIE.