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Early postnatal cerebral Doppler changes in relation to birth weight
Y F Cheung1, P K Lam, C Y Yeung
1Department of Paediatrics, University of Hong Kong, Queen Mary Hospital.
Insights
This study establishes normative cerebral Doppler data for healthy infants. Small for gestational age infants show distinct early Doppler patterns, suggesting a link to their intrauterine environment.
Area of Science:
- Neonatal physiology
- Cerebrovascular research
- Pediatric imaging
Background:
- Cerebral blood flow regulation is critical in neonates.
- Establishing normative Doppler data aids in identifying deviations.
- Infants small for gestational age (SGA) may have altered cerebral hemodynamics.
Purpose of the Study:
- To create a normative database for anterior cerebral artery Doppler measurements in healthy term infants.
- To compare Doppler indices between infants appropriate for gestational age (AGA) and SGA.
- To investigate early postnatal cerebral hemodynamic changes in relation to gestational age and growth status.
Main Methods:
- Serial Doppler ultrasonography of the anterior cerebral artery.
- Study included 50 healthy term infants within the first 5 days of life.
- Comparison between infants appropriate for gestational age (AGA) and small for gestational age (SGA).
Main Results:
- In AGA infants, Pourcelot's resistance index (PI) decreased, while peak systolic and end-diastolic velocities increased postnatally.
- SGA infants exhibited a significantly lower PI within the first 24 hours.
- This difference in SGA infants was attributed to increased end-diastolic flow velocity, potentially reflecting intrauterine conditions.
Conclusions:
- Normative cerebral Doppler values are established for early neonatal life.
- Early postnatal cerebral blood flow patterns differ between AGA and SGA infants.
- Altered end-diastolic flow in SGA infants may indicate persistent intrauterine hemodynamic adaptations.
Abstract:
Serial Doppler studies of the anterior cerebral artery were performed on 50 healthy term infants in the first 5 days of life. This study aims to establish a normative database for cerebral Doppler measurements in infants born appropriate for gestational age (AGA) and to compare them with those born small for gestational age (SGA). The difference between SGA and AGA infants was documented. In AGA infants, the Pourcelot's resistance index (PI) decreased over the first 5 days, while both the peak systolic flow velocity and end diastolic flow velocity increased. In SGA infants, the PI was significantly lower in the first 24 h of life. This was accounted for by an increase in the end diastolic flow velocity which may be a continuation of the intrauterine situation. The significance of the difference is discussed.