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Evaluation of cerebral blood flow changes by transfontanelle Doppler ultrasound in infantile hydrocephalus
Insights
Transfontanelle Doppler ultrasound can detect early cerebral blood flow changes in hydrocephalic infants. This method shows significant differences in systolic and pulsatility index values, aiding in diagnosis.
Area of Science:
- Pediatric Neurology
- Medical Imaging
- Cerebrovascular Physiology
Background:
- Hydrocephalus in infants can lead to altered cerebral hemodynamics.
- Early detection of these changes is crucial for timely intervention.
- Transfontanelle Doppler ultrasound is a non-invasive method to assess cerebral blood flow.
Purpose of the Study:
- To evaluate the utility of transfontanelle Doppler ultrasound in assessing cerebral blood flow velocity in hydrocephalic infants.
- To compare Doppler-derived hemodynamic parameters between normal and hydrocephalic infants.
Main Methods:
- Doppler ultrasound was used to measure systolic (S) and end-diastolic (D) flow velocities in the anterior cerebral artery of 10 hydrocephalic and 50 normal infants.
- The pulsatility index (PI) was calculated using the formula PI = (S-D)/S.
- Statistical analysis was performed to compare hemodynamic parameters between the two groups.
Main Results:
- A statistically significant difference was observed in systolic and pulsatility index values between hydrocephalic and normal infants (P < 0.05).
- No significant difference was found in end-diastolic values.
- These findings suggest altered cerebrovascular dynamics in infantile hydrocephalus.
Conclusions:
- Transfontanelle Doppler ultrasound is a valuable tool for the early diagnosis of cerebral blood flow alterations in hydrocephalic infants.
- Increased cerebrovascular compliance may compensate for elevated perivascular pressure, maintaining normal cerebral blood flow.
- This non-invasive technique aids in understanding and managing hydrocephalus-related hemodynamic changes.
Abstract:
Doppler ultrasound investigation of cerebral blood flow velocity was performed in hydrocephalic infants through the anterior fontanelle. Systolic (S) and end-diastolic (D) frequency values recorded on the anterior cerebral artery were used to define the pulsatility index (PI) calculated from the equation PI=S-D/S. Comparison between systolic, end-diastolic and pulsatility index values of 50 normal infants and 10 hydrocephalic infants showed a statistically significant difference (P less than 0.05) for systolic and pulsatility index values. However, no significant difference was found for end-diastolic values. The authors believe that the phenomenon could be explained as an increase of the cerebrovascular compliance which counteracts the increase of the perivascular pressure in an attempt to maintain a normal cerebral blood flow. Therefore, the transfontanelle Doppler ultrasound technique may provide a useful and early tool in diagnosing cerebral blood-flow changes in hydrocephalic infants.