title: Improved colonoscopy success rate with a distally attached mucosectomy cap.
abstract: OBJECTIVE
  Although colonoscopy is a well-established procedure, various technical difficulties may cause failure. This report describes experience with cap-assisted colonoscopy (CAC), a technique in which a mucosectomy cap is attached to the end of colonoscope in order to improve the success rate.
  
  
  METHODS
  From January 2003 to May 2005, CAC was used in consecutive patients with difficult colonoscopy procedures, which were defined firstly as failure to pass through the sigmoid colon after 20 min of examination, or secondly as failure to reach the cecum at the end of the procedure. Patients with prior colonic surgery, poor bowel preparation, distal colonic stricture, or obstructing tumors were excluded. The results with the CAC method were reviewed retrospectively.
  
  
  RESULTS
  A total of 100 patients met the criteria for difficult colonoscopy during the study period. When CAC was used to repeat the procedure, cecal and terminal ileal intubation could then be achieved in 94 and 70 patients, respectively. In the remaining six patients in whom cecal intubation failed, one failure was due to a tumor obstruction at the splenic flexure.
  
  
  CONCLUSIONS
  CAC can be used as a rescue method to improve the success rate of colonoscopy when failure is encountered.
authors: Institute of Digestive Diseases, Chinese University of Hong Kong, Shatin, Hong Kong.
authors: Y T
authors: YT
authors: Lee
authors: A J
authors: AJ
authors: Hui
authors: V W S
authors: VW
authors: Wong
authors: L C T
authors: LC
authors: Hung
authors: J J Y
authors: JJ
authors: Sung