According to the data presented by a randomized, controlled clinical trial, it was noticed that sigmoidoscopy with cap shows a considerable increase in pain. Sigmoidoscope has out via the rectum into the sigmoid colon and sigmoidoscope is a thin, tube-like instrument with a light and a lens for viewing. In addition, the cap is a transparent plastic hood affixed to the colonoscope's tip that flatten out the semilunar folds and rise the mucosal exposure. Trials on cap-assisted colonoscopy have displayed a reduction in pain, a higher success rate and faster intubation time assigned to the use of the cap. No similar studies have been published on sigmoidoscopy even though it is a general procedure related to consequent pain.

To study aims was to probe whether the use of a transparent cap for sigmoidoscopy has an impact on depression, time or success rate. To impersonator the tendencies of daily clinical practice, the trainee endoscopist executes the process, and no analgesics or sedatives were used. Perform a randomized, controlled clinical trial with a parallel design consisting of two groups masked for the intervention. The primary endpoint was a pain, recorded on a 100-mm visual analog scale (VAS). Our results found cap-assisted sigmoidoscopy to be significantly more painful than non-cap-assisted sigmoidoscopy (median VAS 50 vs 38 mm; p = 0.047). It found no differences in time or success rate due to the cap. Evaluated assessments demonstrate pain management, e.g., analgesics which is not routinely used for sigmoidoscopy, when a cap is used to obtain therapeutic or diagnostic advantages.