Surveillance in Ulcerative Colitis: Narrow Band Image Versus Chromoendoscopy for High-risk Groups

Exclusion Criteria

• •All of the following conditions should be excluded for 1st surveillance colonoscopy study
• •1. A patient who underwent total or segment colectomy.
• •2. A patient who taking (warfarin or direct oral anticoagulants and cannot stop them for procedures owing to the high thromboembolic risk
• •3. A patient who has known thrombocytopenia (less than 80,000/µL in recent 6 months
• •4. A patient who has a coagulopathy
• •5. A patient who has chronic renal disease evidenced by serum creatinine \> 1.2 mg/dL within 6 months of study participation
• •6. A patient who has already undergone surveillance colonoscopy within 1 year
• •All of the following conditions should be excluded for 2nd surveillance colonoscopy study even if they were included in 1st surveillance study.
• •1. A patient who underwent total or segment colectomy after 1st surveillance colonoscopy for this trial.
• •2. A patient who taking (warfarin or direct oral anticoagulants and cannot stop them for procedures owing to the high thromboembolic risk
• •3. A patient who has known thrombocytopenia (less than 80,000/µL in recent 6 months
• •4. A patient who has a coagulopathy
• •5. A patient who has chronic renal disease evidenced by serum creatinine \> 1.2 mg/dL within 6 months of study participation