IDDF2020-ABS-0184 Differences of adenoma detection rate (ADR) between high definition colonoscopes – a retrospective cross-sectional study

Background A high-quality screening colonoscopy is critical in the prevention and early detection of colorectal cancer. Hence, several innovations and techniques have been proposed to potentially improve the quality of colonoscopy. One of which is the use of new generation high definition colonoscopes to increase the adenoma detection rate (ADR). This study aims to determine the difference of ADR between the new generation high definition colonoscopes. Methods This is a single-centre, retrospective cross-sectional study that compares the ADR with screening colonoscopies using 180/190 series Olympus colonoscopes and 290 series Olympus colonoscopes. A review of endoscopy databank over a 6 month period (January 2019 to June 2019) was done. Asymptomatic patients, age 50 – 75 years, classified as average risk for developing colon cancer, who had their indexed colonoscopy performed by experienced endoscopist were included. Results A total of 197 out of 340 patients reviewed met the inclusion criteria. 64% of colonoscopies were performed using the 290 series Olympus colonoscopes. The majority of included patients are male, 77% of patients in the 180/190 series group and 53% of patients in the 290 series group. The ADR using the 180/190 series Olympus colonoscope group is 25% (95% CI of 17%-37%) as compared to 45% (95% CI of 27%-54%) using the 290 series Olympus colonoscopes. The difference is statistically significant with a p-value of 0.006. Conclusions The 290 series Olympus colonoscopes showed a statistically significant higher adenoma detection rate as compared to the 180/190 series Olympus colonoscopes. This reflects a significant difference between the new generation high definition colonoscopes in terms of ADR.