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[Benign chronic conjugated hyperbilirubinaemia: rotor syndrome or hepatic storage impairment?]
Insights
This study investigates a rare case of lifelong jaundice in a 52-year-old female, revealing impaired bromsulfalein (BSP) transport despite normal liver histology and bile acid levels. The findings highlight a specific defect in BSP storage and transport capacity.
Area of Science:
- Hepatology
- Bile Acid Metabolism
- Clinical Biochemistry
Background:
- Presents a unique case of a 52-year-old female with lifelong jaundice.
- Investigates the underlying mechanisms of conjugated hyperbilirubinemia in the absence of apparent liver disease.
Observation:
- Observed marked conjugated hyperbilirubinemia.
- Noted delayed plasma disappearance rates for bromsulfalein (BSP) and indocyanine green.
- Liver histology, plasma bile acids, and 14-C-cholic acid clearance were within normal limits.
Findings:
- Demonstrated a pronounced impairment in the relative storage capacity of BSP (S = 2.4 mg/mg%).
- Showed a moderate decrease in the maximum transport rate of BSP (BSP-transport maximum).
- Highlights a specific defect in hepatic uptake and storage of organic anions.
Implications:
- Suggests a distinct inherited disorder affecting hepatic transport proteins involved in bile excretion.
- Provides insights into the pathophysiology of certain types of inherited cholestasis.
- Underscores the utility of functional tests like BSP and indocyanine green clearance in diagnosing complex liver function abnormalities.
Abstract:
In a 52-year-old female who was jaundiced since early childhood, marked conjugated hyperbilirubinaemia and a delay of bromsulfophthalein and indocyanine green plasma disappearance rates were observed. Liver histology, plasma bile acids and plasma clearance of 14-C-cholic acid were normal. There was a pronounced impairment of the relative storage capacity of bromsulfophthalein (S = 2,4 mg/mg%) and a moderate decrease of BSP-transport maximum.