title: A unique approach to quantifying the changing workload and case mix in laparoscopic colorectal surgery.
abstract: OBJECTIVE
  Laparoscopic colorectal surgery includes a range of operations with differing technical difficulty, and traditional parameters, such as conversion and complication rates, may not be sensitive enough to assess the complexity of these procedures. This study aims to define a reproducible and reliable tool for quantifying the total workload and the complexity of the case mix.
  
  
  METHODS
  This is a review of a single surgeon's 10-year experience. The intermediate equivalent value scoring system was used to code complexity of cases. To assess changes in the workload and case mix, the period has been divided into five phases.
  
  
  RESULTS
  Three hundred and forty-nine laparoscopic operations were performed, of which there were 264 (75.6%) resections. The overall conversion rate was 17.8%, with progressive improvement over the phases. Complex major operation (CMO), as defined in the British United Provident Association (BUPA) schedule of procedures, accounted for 35% of the workload. In spite of similar numbers of cases in each phase, there was a steady increase in the workload score, correlating with the increasing complexity of the case mix. There was no significant difference in the conversion and complications rates between CMO and non-CMO. The paradoxical increase in the mean operating time with increasing experience corresponded to the progressive increase in the workload score, reflecting the increasing complexity of the case mix.
  
  
  CONCLUSIONS
  This article establishes a reliable and reproducible tool for quantifying the total laparoscopic colorectal workload of an individual surgeon or of an entire department, while at the same time providing a measure of the complexity of the case mix.
authors.affiliation: Cwm Taf NHS Trust, Prince Charles Hospital, Merthyr Tydfil, Wales School of Health, Science and Sports, University of Glamorgan, Pontypridd, Wales, UK.
authors.forename: P R
authors.initials: PR
authors.lastname: Shah
authors.forename: V
authors.initials: V
authors.lastname: Gupta
authors.forename: P N
authors.initials: PN
authors.lastname: Haray
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D003108:Colonic Diseases / Q000601:surgery*; D003107:Colorectal Surgery / Q000706:statistics & numerical data*; D003953:Diagnosis-Related Groups; D013505:Digestive System Surgical Procedures / Q000009:adverse effects / Q000379:methods / Q000706:statistics & numerical data*; D005260:Female; D006801:Humans; D010535:Laparoscopy / Q000009:adverse effects / Q000706:statistics & numerical data*; D059032:Learning Curve; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications; D012002:Rectal Diseases / Q000601:surgery*; D013997:Time Factors; D016526:Workload / Q000706:statistics & numerical data*