Differences in screening vs non-screening colonoscopy: scope for improvement?

Area of Science:

• Gastroenterology
• Public Health
• Cancer Screening

Background:

• Colonoscopy is a key tool in the National Health Service (NHS) Bowel Cancer Screening Programme (BCSP).
• Quality assessment of colonoscopy is typically performed using the global rating scale (GRS).
• Practitioners performing screening colonoscopies also conduct non-screening procedures, necessitating a quality comparison.

Purpose of the Study:

• To compare colonoscopy quality indicators between screening and non-screening procedures performed by a single practitioner.
• To evaluate differences in caecal intubation, adenoma detection, and neoplasia detection rates.
• To inform quality assessments when comparing screening and non-screening colonoscopies using GRS.

Main Methods:

• Retrospective analysis of 1961 consecutive colonoscopies (2007-2014) by one practitioner.
• Data extracted from electronic patient records and the BCSP Exeter database.
• Comparison of patient demographics, sedation, and GRS metrics (caecal intubation, adenoma/neoplasia detection).

Main Results:

• Screening colonoscopies (n=1067) had higher caecal intubation rates (96.3% vs 90%) and adenoma detection rates (46.8% vs 26.3%) than non-screening (n=894).
• Non-screening patients were younger and less likely to be male.
• No significant difference in neoplasia detection rates was observed between the groups.

Conclusions:

• Significant differences exist in colonoscopy quality between screening and non-screening procedures, particularly in completion and pathology detection.
• These variations must be considered when using the global rating scale (GRS) for comparative quality assessments.
• The findings highlight the need for context-specific interpretation of GRS data in different colonoscopy service settings.