title: The frequency and outcome of biliary atresia in the UK and Ireland.
abstract: BACKGROUND
  Biliary atresia is an obliterative cholangiopathy of infancy that is fatal if untreated. Surgical treatment, the Kasai portoenterostomy, may restore bile flow and clear jaundice, and, if successful, achieve a 10-year survival of 90% with a native liver. The outcome of a 2-year cohort of children with biliary atresia in the UK and Ireland was assessed to find the current frequency, the factors influencing outcome, and the medium-term need for liver transplantation.
  
  
  METHODS
  Cases diagnosed between March, 1993, and February, 1995, were notified by paediatricians to the British Paediatric Surveillance Unit via a monthly reporting system. Confirmed cases were followed up by postal questionnaires to notifying paediatricians.
  
  
  RESULTS
  93 cases were confirmed, a frequency of 1/16700 livebirths. Primary surgery was done in 91 children in 15 surgical centres with an early success rate for clearing jaundice of 55% overall. Centres were grouped according to caseload; group A had more than 5 cases/year and group B fewer than 5 cases/year. Early success was higher in group-A centres, odds ratio 2.02 (95% CI 0.86-4.73), but this did not reach statistical significance. Of 41 children in whom surgery was unsuccessful in clearing jaundice 9 (22%) died and 30 (73%) underwent liver transplantation. Survival without liver transplantation and overall survival were both significantly greater in group-A centres, rate ratios 0.48 (95% CI 0.27-0.86) and 0.32 (0.11-0.94). Actuarial 5-year survival without transplantation was 61.3% in group-A centres and 13.7% in groupB centres. Actuarial 5-year overall survival was 91.2% in group A and 75% in group B. Once centre size was taken into account, no other factor, including age at surgery, was predictive of survival without transplantation or overall survival.
  
  
  CONCLUSIONS
  The outcome of children with biliary atresia is related to the caseload of the surgical centre where they have their primary surgery. Children with biliary atresia should be managed in surgical centres with a caseload of more than five cases annually.
authors.affiliation: Liver Unit, Birmingham Children's Hospital NHS Trust, UK. Pat.Mckiernan@bhamchildrens.wmids.nhs.uk
authors.forename: P J
authors.initials: PJ
authors.lastname: McKiernan
authors.forename: A J
authors.initials: AJ
authors.lastname: Baker
authors.forename: D A
authors.initials: DA
authors.lastname: Kelly
mesh_terms: D000206:Actuarial Analysis; D001656:Biliary Atresia / Q000453:epidemiology / Q000401:mortality / Q000601:surgery*; D015331:Cohort Studies; D004766:Enterostomy; D005260:Female; D005865:Gestational Age; D006276:Health Facility Size; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007494:Ireland / Q000453:epidemiology; D016031:Liver Transplantation; D016015:Logistic Models; D008297:Male; D008485:Medical Audit; D011795:Surveys and Questionnaires; D016896:Treatment Outcome; D006113:United Kingdom / Q000453:epidemiology