摘要
To the Editor： Painless intubation is extremely important to avoid perforation during colonoscopy. Ultrathin colonoscopes and standard gastroscopes （9.2-9.8 mm） can increase the proportion of patients with painless intubation, but there remain approximately 10% patients who surlier fiom moderate or severe abdominal pain. Sedation and anesthesia during colonoscopy could alleviate patient＇s suffering and improve the success rate of colonoscopy, but warning effect of abdominal pain disappears and the risk of perforation is increasing.In this paper, a transnasal gastroscope （5.9 ram） was used to simulate the ultrathin colonoscope for examination. The authors hypothesized that none of the patients would have severe abdominal pain in this study, demonstrating good safety of transnasal gastroscope on colon examination.
To the Editor： Painless intubation is extremely important to avoid perforation during colonoscopy. Ultrathin colonoscopes and standard gastroscopes （9.2-9.8 mm） can increase the proportion of patients with painless intubation, but there remain approximately 10% patients who surlier fiom moderate or severe abdominal pain. Sedation and anesthesia during colonoscopy could alleviate patient＇s suffering and improve the success rate of colonoscopy, but warning effect of abdominal pain disappears and the risk of perforation is increasing.In this paper, a transnasal gastroscope （5.9 ram） was used to simulate the ultrathin colonoscope for examination. The authors hypothesized that none of the patients would have severe abdominal pain in this study, demonstrating good safety of transnasal gastroscope on colon examination.
