Neonatal cerebral Doppler: Arterial and venous flow velocity measurements using color and pulsed Doppler system
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Conceição d'Orey
Abstract
Objective: To contribute to the establishment of reference values of blood flow velocity assessed by cerebral Doppler in healthy infants related to gestational age and birth weight during the first week of life.
Methods: Five arteries and three veins were evaluated respectively in 120 (74 premature) newborns and in 100 70 preterm) infants. In a quarter of the latter three recordings at 5-minute intervals were made to assess reproducibility.
The relation between flow measurements and gestational age was assessed by linear regression, means by analysis of variance (or Kruskall-Wallis test) and paired samples by Student's t test.
Results: There was a significant increase of arterial velocities with increasing gestational age and birth weight, but not for venous velocities. Significant higher values were found in the internal carotid artery followed by the medium cerebral artery. The venous velocities were highly reproducible and the main patterns observed were bandlike and sinusoid type.
Conclusion: The knowledge of normal cerebrovascular physiology is essential to understand the pathogenesis of neonatal brain damage and can help pediatricians in an accurate interpretation of the flow profile in neurological pathology.
Copyright (c)1999 by Walter de Gruyter GmbH & Co. KG
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Articles in the same Issue
- Cord occlusion techniques for selective termination in monochorionic twins
- Comparison of vaginal and cesarean section delivery for fetuses in breech presentation
- Neonatal cerebral Doppler: Arterial and venous flow velocity measurements using color and pulsed Doppler system
- MMP/TIMP imbalance in amniotic fluid during PROM: an indirect support for endogenous pathway to membrane rupture
- Pulmonary hemorrhage in neonates of early and late gestation
- Nucleated red blood cells in cord blood of singleton term and post-term neonates
- Neonatal lung function in very immature infants with and without RDS
- Doppler sonographic findings for hypertension in pregnancy and HELLP syndrome
- Vitamin E status of infants at birth
- Successful transcutaneous arterial embolization of a giant hemangioma associated with high-output cardiac failure and Kasabach-Merritt syndrome in a neonate: A case report
- 1H NMR as a non-invasive probe of amniotic fluid in insulin dependant diabetes mellitus
