Cytomegalovirus-associated biliary atresia: An aetiological and prognostic subgroup

Abstract

Background and aimsPerinatal cytomegalovirus (CMV) infection is a possible cause or trigger of biliary atresia though clinical evidence is scant. We hypothesised that CMV IgM+ve biliary atresia is a separate clinical entity compared to CMV IgM−ve biliary atresia. MethodsProspective single-centre study. 210 infants with histologically confirmed biliary atresia were treated in our institution (Jan. 2004 to Dec. 2011); of these 20 (9.5%) were CMV IgM+ve at presentation. We compared these with 111 infants who were CMV IgM−ve (controls) for clinical features, biochemistry at presentation and outcome following Kasai portoenterostomy (KPE). A blinded comparison of age-matched liver histology was also performed. Data are quoted as median (interquartile range). A P value ≤0.05 was regarded as significant. ResultsInfants with CMV IgM+ve biliary atresia were older at Kasai portoenterostomy (or laparotomy) [70 (60–80) days vs. 56 (44–75)days; P=0.003] and were more jaundiced [175 (147–224) vs. 140 (121–181) μmol/L; P=0.002+ with higher AST*287 (157–403) vs. 180 (133–254) IU/L; P=0.005] and aspartate aminotransferase-to-platelet ratio index [1.1 (0.79–3.0) vs. 0.63 (0.43–0.95)] levels. Liver histology: CMV IgM+ve biliary atresia was characterised by a greater degree of inflammation (P<0.0001) and fibrosis (P=0.02), whereas CMV IgM−ve isolated biliary atresia had a higher degree of lobular cholestasis (P=0.001). This effect was independent of the effects of age at KPE. Outcome: CMV IgM+ve biliary atresia had a poorer outcome with a reduced clearance of jaundice (15% vs. 52.2%; P=0.002), native liver survival (P<0.0001) and increased mortality (P=0.002). ConclusionsCMV IgM+ve biliary atresia is a distinct clinical and pathological entity with a diminished response to Kasai portoenterostomy.