LAUSR

Background Second-generation colon capsule endoscopy (CCE-2) has been reported as a potential tool for monitoring ulcerative colitis (UC). However, its excretion rate is still unsatisfactory, and the bowel preparation regimen is not well tolerated. Furthermore, a standard bowel preparation regimen validated for UC has not been established. The aim of this study was to develop a simple 1-day CCE-2 procedure while evaluating its excretion rate and acceptability in UC. Factors associated with the colonic transit time and acceptability of CCE-2 were evaluated. Methods Thirty-three patients were prospectively evaluated. Five hundred milliliters of hypertonic polyethylene glycol solution, followed by 250 mL of water, was ingested 2.5 hours before, then 1, 3, and 6 hours after capsule ingestion until its excretion, with castor oil added to the second ingestion. Mayo endoscopic subscore (MES) and Ulcerative Colitis Endoscopic Index of Severity (UCEIS) were graded, and their correlations with fecal calprotectin (FC) were assessed. A questionnaire comparing CCE-2 with previous colonoscopy (CS) was conducted. Results The excretion rate was 93.9% (31/33). The acceptability of CCE-2 was superior to CS (CCE-2 42.4% vs CS 27.3%). The median colonic transit time was 119 minutes and showed a positive correlation with MES (P = 0.010), UCEIS (P = 0.010), and FC (P = 0.041). CCE-2 was not favored by patients whose colonic transit times were longer. Conclusions A novel bowel preparation regimen of CCE-2 was well tolerated, with a high excretion rate, by UC patients. Patients with active disease required longer colonic transit time, which may have resulted in the lower acceptability of CCE-2.