Clinical Course Following Partial External Biliary Diversion for Progressive Familial Intrahepatic Cholestasis 1: A Report of Two Patients

Abstract

AIM:To better understand the effect of partial external biliary diversion (PEBD) in patients with progressive familial intrahepatic cholestasis 1 (PFIC1). MATERIALS AND METHODS:We analyzed quantitative changes in the concentrations of individual bile acids in serum, urine, and biliary bile, and concomitant changes in symptoms such as pruritus, in 2 patients whose PFIC1 clinically evolved to resemble the course of benign recurrent intrahepatic cholestasis (BRIC) upon treatment with PEBD. RESULTS: Patient 1 showed good therapeutic effect after PEBD including improved liver function test results and decreased total bile acids in serum, as well as decreased pruritus. The cholic acid (CA)/chenodeoxycholic acid (CDCA) ratio in biliary bile also decreased. Patient 2, however, experienced little decrease in pruritus after PEBD, and showed no clear change in the CA/CDCA ratio. Nonetheless, this patient's course did not rapidly worsen. CONCLUSION: In PFIC1, increased bile secretion and a decreased CA/CDCA ratio in biliary bile may be the most important responses after PEBD. Relief of pruritus is also an important sign of therapeutic effect. Moreover, progression of symptoms in PFIC1 sometimes can be delayed by PEBD, resulting in a relatively mild BRIC-like course, even when the CA/CDCA ratio and pruritus show little change. However, mechanisms underlying clinical benefits remain obscure. Abbreviations PFIC1: progressive familial intrahepatic cholestasis 1; GGT: γ-glutamyltransferase;