CT colonography, every 5 years, is endorsed as an alternative to colonoscopy every 10 years because of its recent performance in the American College of Imaging Network Trial 6664 (also known as the National CT Colonography Trial) (123).
RCT, randomized controlled trial.
The practice guidelines of the American Society of Anesthesiologists allow ingestion of clear liquids until 2 h before sedation (119).
Therefore, flexible sigmoidoscopy is carried out zelf vispate maken by highly skilled practitioners, it may be recommended at 10-year, rather than 5-year intervals (8).Observational studies or case series, very weak recommendations; other alternatives may be equally reasonable.Many perforations are related to polypectomy and because small polyps are so numerous, small polyp polypectomy perforations contribute substantially to the overall perforation risk (87).The ACG continues to endorse the menu-of-options approach as appropriate to CRC screening.In the Manitoba study, the reduction in incidence was 50 for the first 5 years after the index negative colonoscopy and increased to 72 at 10 years (98).Abdominal obesity is a stronger risk factor than truncal obesity or BMI (59,61).
Cancer prevention tests.
Results from earlier multicenter trials in the United States ranged from excellent (124) to poor (121,125).
The ACG is an organization of more than 10,000 clinical gastroenterologists and related health professionals.This suggests that significant numbers of lesions present at the index colonoscopy were not detected.Major advantages of colonoscopy as a screening test include that it is widely available (81 examines the entire colon, allows single-session diagnosis and treatment, is comfortable when carried out with sedation, and is the only test recommended at 10-year intervals (2-8).Elements critical to high-quality mucosal inspection during colonoscopy and which should be incorporated into all colonoscopy practices are detailed in Table.In this approach, multiple options for screening are presented which differ with regard to their effectiveness, risk, and degree of invasiveness (and, therefore, potentially their acceptability to patients).