P299 A prospective randomised trial comparing dye-based chromoendoscopy with electronic virtual chromoendoscopy for detection of colonic neoplastic lesions during IBD surveillance colonoscopy

O. González-Bernardo1,2, S. Vivas3, R. de Francisco1,4, I. Pérez-Martínez1,4, A. Castaño-García1,4, V. Jiménez-Beltrán1, P. Flórez-Díez1, S. Martínez-González4, V. Rolle5, P. Suárez5, A. Suárez1,4, S. Riestra Menéndez1,4

1Hospital Universitario Central De Asturias, Department of Gastroenterology, Oviedo, Spain, 2Universidad de León, Biomedicina y Ciencias de la Salud, León, Spain, 3Hospital Universitario de León, Gastroenterology, León, Spain, 4Instituto de Investigación Sanitaria del Principado de Asturias ISPA, Instituto de Investigación Sanitaria del Principado de Asturias, Oviedo, Spain, 5Instituto de Investigación Sanitaria del Principado de Asturias ISPA, Plataforma de Bioestadística y Epidemiología, Oviedo, Spain


Patients with inflammatory bowel disease (IBD) have an increased risk of colorectal cancer. Dye-based chromoendoscopy (CE) is the currently recommended method for the detection of dysplasia in IBD surveillance colonoscopy; the role of virtual chromoendoscopy (VCE) is not yet well defined. To compare CE with VCE using iSCAN1 digital image enhanced colonoscopy in the detection of colonic neoplastic lesions in IBD patients.


Randomised, single-centre trial to assess the detection rate of colonic neoplastic lesions in patients with long-standing IBD. Patients were randomised in two arms: dye-spraying CE using indigo carmine and electronic VCE using iSCAN1 digital image. Detection rates of dysplasia or any neoplastic lesion were compared by the two endoscopic techniques.


A total of 129 patients were studied (67 by CE and 62 by VCE). Demographic and clinical characteristics were homogeneous in the two groups; 26 Crohn′s disease and 103 ulcerative colitis, 52% women, mean age 50 years, median duration of IBD 204 months, family history of colorectal cancer in 10 (8%), associated primary sclerosing cholangitis in 8 (6%), personal history of colorectal dysplastic lesions in 12 (9%), and more than 50% colonic involvement in 72 (56%). In total, 27 lesions (9 hyperplastic, 8 adenomatous and 10 low-grade dysplasia) were detected in 23 patients, without differences between CE and VCE arms (15 [22%] and 12 [19%] lesions, respectively; p = 0.98); on the other hand, neoplastic lesion (dysplasia or adenoma) detection rates was similar (12 [18%] in CE and 6 [10%] in VCE arms, p = 0.2). The duration of the withdrawal time of colonoscopy in minutes for patients in the CE group was median 14 min and in the VCE group was median 10 min (p < 0.001).


There is no statistical difference between CE and VCE using iSCAN1 in the detection rate of colonic neoplastic lesions in IBD patients. Surveillance colonoscopy with VCE (iSCAN1) spends less time than conventional CE.