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[Neonatal Doppler velocimetry in full term small-for-gestational age newborns]
Iracema Augusta Carvalho Cortez Muniz1, Abimael Aranha Netto, Vanda Maria Gimenes Gonçalves
1Faculdade de Ciências Médicas, Universidade Estadual de Campinas, Campinas, SP, Brasil.
Arquivos De Neuro-Psiquiatria
|November 5, 2003
Summary
Small-for-gestational age (SGA) newborns exhibit reduced cerebral blood flow velocity (CBFV) in the anterior cerebral artery (ACA). This finding highlights potential circulatory differences in SGA infants, impacting neonatal health assessments.
Area of Science:
- Neonatal Medicine
- Pediatric Neurology
- Medical Imaging
Background:
- Small-for-gestational age (SGA) newborns represent a vulnerable population with potential long-term health implications.
- Assessing cerebral blood flow (CBF) is crucial for understanding neonatal brain development and health.
- Cranial ultrasound Doppler is a non-invasive method for evaluating CBF in neonates.
Purpose of the Study:
- To evaluate and compare cerebral blood flow velocity (CBFV) in term small-for-gestational age (SGA) newborns versus appropriate-for-gestational age (AGA) newborns.
- To identify specific cerebral arteries affected by reduced CBFV in SGA infants.
- To explore potential correlations between CBFV and clinical factors in SGA newborns.
Main Methods:
- A cohort of 60 term newborns was divided into SGA (24) and AGA (36) groups.
- Cranial ultrasound Doppler assessments were conducted between 24 and 48 hours after birth.
- Cerebral blood flow velocity parameters, including peak systolic flow velocity (PSFV) and mean flow velocity (MFV), were measured in the anterior cerebral artery (ACA) and middle cerebral artery (MCA).
Main Results:
- SGA newborns demonstrated significantly lower PSFV and MFV in the ACA compared to AGA newborns.
- No significant differences in CBFV parameters were observed in the MCA between the two groups.
- In SGA newborns, MFV in the ACA was statistically associated with weight/gestational age, neonatal polycythemia, and mean arterial blood pressure.
- Fetal suffering, mean arterial blood pressure, and maternal smoking during pregnancy were linked to MFV in the MCA.
Conclusions:
- Term SGA newborns exhibit significantly reduced CBFV, specifically PSFV and MFV, in the ACA.
- These circulatory alterations in the ACA may be influenced by factors such as birth weight, polycythemia, and blood pressure.
- MCA flow velocity in SGA infants may be affected by fetal distress and maternal smoking, warranting further investigation.