title: The substitution of endoscopic ultrasound for endoscopic retrograde cholangio-pancreatography: implications for service development and training.
abstract: OBJECTIVE
  Choledocholithiasis and other benign conditions of the biliary tree are difficult to define clinically. Endoscopic retrograde cholangio-pancreatography (ERCP) is increasingly being replaced as the investigation of choice by other imaging modalities. The aim of this study was to measure the impact of substituting endoscopic ultrasound (EUS) for ERCP in terms of case throughput and the proportion of therapeutic ERCPs performed.
  
  
  METHODS
  Over a 12-month period, cases with a low/medium likelihood for biliary pathology were triaged to EUS rather than ERCP. Data were collected on the proportion of ERCPs performed with diagnostic or therapeutic intent and compared with data from the preceding 12-month period.
  
  
  RESULTS
  In the 12 months to April 2001, 518 cases were referred for ERCP; 140 underwent EUS and 378 underwent ERCP. The proportions of diagnostic and therapeutic ERCP were 14% and 86%, respectively. Benign biliary disease represented 33% of all referrals for EUS, and calculi were identified in 6% of these cases. During the preceding year, 637 ERCPs were performed. The proportion of diagnostic (33%) and therapeutic (67%) cases differed from the index year (P < 0.001).
  
  
  CONCLUSIONS
  The substitution of EUS for ERCP results in significant quantitative and qualitative change to ERCP practice, which has direct consequences for training and service development.
authors.affiliation: Department of Gastroenterology, Guy's and St Thomas' Hospital, London, UK. john.meenan@gstt.sthames.nhs.uk
authors.forename: John
authors.initials: J
authors.lastname: Meenan
authors.forename: Jeremy
authors.initials: J
authors.lastname: Tibble
authors.forename: Priyajit
authors.initials: P
authors.lastname: Prasad
authors.forename: Mark
authors.initials: M
authors.lastname: Wilkinson
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001660:Biliary Tract Diseases / Q000175:diagnosis* / Q000000981:diagnostic imaging; D002404:Catheterization; D002648:Child; D002675:Child, Preschool; D002760:Cholangiopancreatography, Endoscopic Retrograde; D002908:Chronic Disease; D019160:Endosonography; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D008875:Middle Aged