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Internal carotid arterial blood flow velocity in infants
1Division of Pediatric Neurology, Osaka Medical Center and Research Institute for Maternal and Child Health, Japan.
Insights
Internal carotid artery blood flow velocity is reduced in infants with cerebral palsy, but not mental retardation, within the first year of life. This finding may help assess infant cerebral circulation status.
Area of Science:
- Neurology
- Pediatrics
- Medical Imaging
Background:
- Cerebral blood flow regulation is critical in early development.
- Assessing cerebral circulation in infants can be challenging.
- Internal carotid artery (ICA) flow dynamics may indicate neurological status.
Purpose of the Study:
- To investigate differences in ICA velocity and pulsatility indexes in infants.
- To compare findings between normal infants, those with cerebral palsy, and those with mental retardation.
- To determine if ICA flow parameters can reflect cerebral circulation status in infants.
Main Methods:
- Evaluated ICA velocity and pulsatility indexes in 62 normal controls, 42 infants with cerebral palsy, and 22 with mental retardation (all <1 year old).
- Analyzed average maximal blood flow velocity (A/L) and maximal end-diastolic flow velocity.
- Measured pulsatility index (PI) across different age groups.
Main Results:
- Normal infants showed increased A/L and end-diastolic velocity with age; PI decreased from newborn-2 months to 3-5 months.
- Infants with cerebral palsy had significantly reduced A/L and end-diastolic velocity in the first 6 months compared to controls.
- No significant differences in A/L, end-diastolic velocity, or PI were found in infants with mental retardation compared to controls.
Conclusions:
- Reduced ICA flow velocity in infants may indicate impaired cerebral circulation, particularly in those with cerebral palsy.
- ICA flow velocity parameters show potential as non-invasive markers for assessing cerebral circulation in infants.
- Pulsatility index did not differentiate between the study groups, suggesting velocity parameters are more sensitive indicators.
Abstract:
The differences in the velocity and pulsatility indexes in the internal carotid artery were evaluated in 62 normal controls, 42 infants with cerebral palsy, and 22 infants with mental retardation, all within the first year of life. In the normal controls, the average maximal blood flow velocity (A/L), and the maximal end-diastolic flow velocity increased during the first year of life. Pulsatility index decreased significantly between the ages of newborn to 2 mos and 3-5 mos, and remained constant thereafter. Compared with normal controls, the average maximal blood flow velocity and the maximal end-diastolic flow velocity values were significantly reduced in infants with cerebral palsy during the first 6 months of life, while no differences in these values were observed in infants with mental retardation. There were no differences in the pulsatility index values in the 3 subject groups throughout the first year of life. Flow velocity in the internal carotid artery could reflect the status of the cerebral circulation in infants within the first year of life.