Related Experiment Videos
Hepatobiliary scintigraphy in children
1Department of Radiology, British Columbia's Children's Hospital, Vancouver, Canada.
Insights
Hepatobiliary scintigraphy using technetium-99m iminodiacetic acid (99mTc-IDA) is crucial for diagnosing pediatric biliary tract disorders. This imaging technique aids in evaluating neonatal jaundice, cystic fibrosis, cholecystitis, bile leaks, and liver transplant complications.
Area of Science:
- Pediatric Radiology
- Nuclear Medicine
- Gastroenterology
Background:
- Hepatobiliary scintigraphy with iminodiacetic acid (IDA) radiopharmaceuticals is vital for assessing pediatric biliary tract function.
- It aids in diagnosing various conditions including neonatal jaundice, gallbladder dysfunction, trauma, and post-liver transplant complications.
Purpose of the Study:
- To highlight the clinical utility of hepatobiliary scintigraphy in pediatric patients.
- To detail its application in specific conditions like biliary atresia, cystic fibrosis, and acalculous cholecystitis.
- To review its role in evaluating bile leaks and liver transplant outcomes.
Main Methods:
- Utilizes technetium-99m labeled IDA compounds for dynamic imaging of the hepatobiliary system.
- Phenobarbital premedication is employed in neonatal jaundice cases to enhance diagnostic accuracy.
- Imaging protocols involve assessing radiotracer uptake, transit, and excretion over time, up to 24 hours.
Main Results:
- Accurate diagnosis of biliary atresia with 91% accuracy, 97% sensitivity, and 82% specificity.
- Characteristic patterns in cystic fibrosis include ductal dilatation and gallbladder dysfunction.
- Effective in detecting bile leaks and assessing post-transplant graft function, drainage, and complications.
Conclusions:
- Hepatobiliary scintigraphy is a valuable non-invasive tool for diagnosing and managing a spectrum of pediatric hepatobiliary diseases.
- It provides essential functional information for conditions where anatomical imaging may be insufficient.
- Its application extends from neonatal diagnostics to post-surgical and transplant evaluations.
Abstract:
Hepatobiliary scintigraphy using iminodiacetic (IDA) radiopharmaceuticals provides clinically useful information on the function of the biliary tract in a variety of pathological processes in children, including neonatal jaundice, gallbladder dysfunction, trauma, and liver transplantation. Phenobarbital premedication (5 mg/kg per day for a minimum of 5 days in divided doses) is used in infants who are being examined for neonatal jaundice to increase the accuracy of 99mTc-IDA scintigraphy in differentiating extrahepatic biliary atresia from neonatal hepatitis. Biliary atresia can be ruled out in an infant if a patent biliary tree is shown with passage of activity into the bowel. If no radiopharmaceutical is noted in the bowel on imaging up to 24 hours, distinction between severe hepatocellular disease and biliary atresia cannot be made. The literature reports 91% accuracy, 97% sensitivity, and 82% specificity for hepatobiliary imaging in the diagnosis of biliary atresia. The impairment of both intrahepatic and extrahepatic biliary drainage is an important cause of liver disease in cystic fibrosis. Hepatobiliary scintigraphy in cystic fibrosis has shown characteristic patterns of dilatation of mainly the left hepatic duct, narrowing of the distal common bile duct, gallbladder dysfunction, and delayed bowel transit. Cholecystitis in children may be acalculous. Sensitivity and specificity for the scintigraphic diagnosis of acute acalculous cholecystitis is reported to range from 68% to 93% and 38% to 93%, respectively. Cholescintigraphy in a suspected bile leak provides information generally not available with other techniques, except for direct cholangiography. If the amount of intraperitoneal accumulation of the tracer is greater than that entering the gastrointestinal tract, surgery is usually indicated. Hepatobiliary imaging in children who have undergone liver transplantation will assess graft vascularity, parenchymal function, biliary drainage, presence of a leak, and obstruction.