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Dye clearance studies in Rotor's syndrome.
The American Journal of Gastroenterology
|April 1, 1979
Summary
Rotor's syndrome impairs the liver's ability to process and excrete substances like sulfobromophthalein sodium (BSP), indocyanine green (ICG), and bilirubin, indicating reduced hepatic storage and excretory functions.
Area of Science:
- Hepatology
- Clinical Biochemistry
- Medical Genetics
Background:
- Rotor's syndrome is a rare genetic disorder characterized by conjugated hyperbilirubinemia.
- Previous studies suggest impaired hepatic uptake and excretion in Rotor's syndrome, but specific mechanisms remain unclear.
Purpose of the Study:
- To investigate the plasma clearance and hepatic handling of sulfobromophthalein sodium (BSP), indocyanine green (ICG), and unconjugated bilirubin in patients with Rotor's syndrome.
Main Methods:
- Plasma clearance studies of BSP, ICG, and unconjugated bilirubin were conducted in six patients diagnosed with Rotor's syndrome.
- Analysis of BSP fractional extraction and hepatic storage capacity (BSP Tm and BSP S) was performed in a subset of patients.
Main Results:
- Patients with Rotor's syndrome exhibited marked retention of BSP, ICG, and unconjugated bilirubin in plasma.
- BSP was predominantly in its unconjugated form at 60 minutes post-injection.
- Significantly reduced BSP transport maximum (Tm) and storage (S) were observed in three patients, alongside impaired unconjugated bilirubin clearance.
Conclusions:
- Rotor's syndrome is characterized by a significant reduction in hepatic storage capacity.
- Impaired excretory function for BSP, ICG, and bilirubin is a key feature of Rotor's syndrome.
- The findings suggest a defect in hepatic anion transport and storage mechanisms in this condition.