Colonoscopy quality improvement after initial training: A cross-sectional study of intensive short-term training.

High-quality is crucial for the effectiveness of colonoscopy and can be achieved by high-quality training and verified with assessment of key performance indicators (KPIs) for colonoscopy such as cecum intubation rate (CIR), adenoma detection rate (ADR) and adequate polyp resection. Typically, trainees achieve adequate CIR after 275 procedures, but little is known about learning curves for KPIs after initial training. This cross-sectional study includes work-up colonoscopies after a positive screening test with fecal occult blood testing (FIT) or sigmoidoscopy, performed by either trainees after 300 training colonoscopies or by consultants. Outcome measures were KPIs. We assessed inter-endoscopist variation in trainees and learning curves for trainees as a group. We also compared KPIs for trainees and consultants as a group.  Data from 6,655 colonoscopies performed by 21 trainees and 921 colonoscopies performed by 17 consultants were included. Most trainees achieved target standards for main KPIs. With time, trainees shortened cecum intubation time and withdrawal time without decreasing their ADR, reduced the proportion of painful colonoscopies, and increased the adequate polyp resection rate (all  < 0.01). Compared to consultants, trainees had higher CIR (97.7 % vs. 96.3 %,  = 0.02), ADR after positive FIT (57.6 % vs. 50.3 %,  < 0.01), and proximal ADR after sigmoidoscopy screening (41.1 % vs. 29.8 %;  < 0.01), higher adequate polyp resection rate (94.9 % vs. 93.1 %,  = 0.01) and fewer serious adverse events (0.65 % vs. 1.41 %,  = 0.02). Trainees performed high-quality colonoscopies and achieved international target standards. Several KPIs continuously improved after initial training. Trainees outperformed consultants on several KPIs.