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Diagnosis of obstructive jaundice in infants: Tc-99m DISIDA in duodenal juice
Insights
Technetium-99m iminodiacetic acid (IDA) cholescintigraphy effectively differentiates biliary atresia from neonatal hepatitis in infants. Analysis of radioactivity in duodenal juice revealed distinct patterns for each condition, aiding diagnosis.
Area of Science:
- Nuclear Medicine
- Pediatric Gastroenterology
- Diagnostic Imaging
Background:
- Prolonged obstructive jaundice in infants presents a diagnostic challenge.
- Differentiating biliary atresia from neonatal hepatitis is crucial for timely intervention.
Purpose of the Study:
- To evaluate the utility of Technetium-99m di-isopropylphenylcarbamoylmethylimidodiacetic acid (HIDA) cholescintigraphy in diagnosing prolonged obstructive jaundice in infants.
- To assess the role of duodenal juice radioactivity measurements in differentiating biliary atresia from neonatal hepatitis.
Main Methods:
- Cholescintigraphy using Technetium-99m IDA was performed on 23 infants with prolonged obstructive jaundice.
- Radioactivity levels in duodenal aspirates were measured.
- Time-activity curves from cholescintigraphy and duodenal juice data were analyzed.
Main Results:
- Four infants were diagnosed with biliary atresia, and the remainder with neonatal hepatitis.
- Distinct time-activity curve patterns differentiated the two conditions.
- Neonatal hepatitis showed higher duodenal radioactivity (peak >1500 cpm/100 µL/mCi), while biliary atresia exhibited a flattened pattern (peak <500 cpm/100 µL/mCi).
Conclusions:
- Technetium-99m IDA cholescintigraphy combined with duodenal juice analysis is a reliable method for differentiating biliary atresia from neonatal hepatitis in infants.
- The quantitative analysis of radioactivity provides clear diagnostic criteria.
Abstract:
Technetium-99m di-isopropylphenylcarbamoylmethylimidodiacetic acid cholescintigraphy, together with measurements of radioactivity in duodenal juice, was used to evaluate 23 infants with prolonged obstructive jaundice. Four patients proved to have biliary atresia. The remainder had neonatal hepatitis. There was distinct differentiation of biliary atresia from neonatal hepatitis when the time-activity curves were analyzed. In neonatal hepatitis the radioactivity in duodenal juice is obviously higher, peaking above 1500 cpm/100 microliter per mCi dose. In biliary atresia the pattern is flattened, with maximal activity below 500 cpm/100 microliter per mCi dose.