Value of Cerebrovascular Resistive Index (RI) Assessed by Transcranial Doppler (TCD) Ultrasonography in Infantile Hydrocephalus.
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Purpose: This study was conducted to determine the value of cerebro-vascular resistive index (RI) in the assessment of hydrocephalic infants. Patients and Methods: Forty selected hydrocephalic infants were examined by cranial sonography, CT brain scanning and transcranial color Doppler ultrasonography. These cases were classified into slight, mild, moderate and sever degrees of hydrocephalus and resistive index value was estimated in each case. Results: In this study RI was elevated in cases of hydrocephalus denoting increased cerebrovascular resistance and there is linear relationship between degree of hydrocephalus and degree of RI elevation. Ten cases out of the selected 40 cases were followed before and after shunt operation. In this group there was a significant decrease of RI value after shunt operation denoting successful decompression of intracranial pressure. Conclusion: The results clearly demonstrated that TCD and evaluation of cerebrovascular RI can be a useful, non-invasive means of assessing the degree of hydrocephalus and also for follow up and monitoring shunt operation.