title: In patients with orthotopic liver transplantation, serum markers of cholestasis are unreliable indicators of biliary secretion.
abstract: OBJECTIVE
  In patients after orthotopic liver transplantation, treatment with the novel immunosuppressant FK 506 may lead to elevated levels of alkaline phosphatase, gamma glutamyl transferase and bilirubin. Up to now it was unclear whether the excretory capacity of the liver in such patients is impaired.
  
  
  METHODS
  We measured quantitatively the secretion of bile acids, phospholipids and cholesterol using the duodenal perfusion method, which allows assessment of biliary secretion without interruption of the enterohepatic circulation. Six healthy volunteers served as controls.
  
  
  RESULTS
  All patients studied after orthotopic liver transplantation had elevated concentrations of serum alkaline phosphatase and gamma glutamyl transferase, whereas only half of them had slightly abnormal serum bilirubin levels. On average, the FK 506-treated patients excreted 1.23 +/- 0.27 mmol/h bile acids, 0.23 +/- 0.04 mmol/h phospholipids and 0.11 +/- 0.02 mmol/h cholesterol, which was not significantly different from the healthy controls.
  
  
  CONCLUSIONS
  The normal secretion rates of biliary bile acids and lipids in FK 506-treated patients with elevated serum alkaline phosphatase and gamma glutamyl transferase indicate that the excretory capacity of the transplanted liver has completely recovered 2-3 months after surgery. In addition, in the majority of these patients elevated serum levels of alkaline phosphatase, gamma glutamyl transferase and bilirubin do not reflect impaired biliary secretion.
authors.affiliation: Department of Internal Medicine IV, University of Heidelberg, Germany.
authors.forename: P
authors.initials: P
authors.lastname: Sauer
authors.forename: A
authors.initials: A
authors.lastname: Stiehl
authors.forename: G
authors.initials: G
authors.lastname: Otto
authors.forename: L
authors.initials: L
authors.lastname: Theilmann
mesh_terms: D000328:Adult; D001646:Bile / Q000378:metabolism*; D015415:Biomarkers / Q000737:chemistry; D002779:Cholestasis / Q000097:blood*; D005260:Female; D006801:Humans; D016031:Liver Transplantation / Q000502:physiology*; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D016559:Tacrolimus / Q000009:adverse effects*
chemical_list: D015415:Biomarkers; D016559:Tacrolimus