Utility of repeat colonoscopy attempt after failed colonoscopy: a systematic review and pooled analysis

Area of Science:

• Gastroenterology
• Endoscopy
• Cancer Screening

Background:

• Colonoscopy is crucial for colon visualization and intervention.
• Incomplete colonoscopies increase the risk of missed proximal colon cancers.
• Alternatives like barium enema or CT colonography lack direct visualization and therapeutic capabilities.

Purpose of the Study:

• To systematically review and meta-analyze outcomes of repeat colonoscopy after a previous incomplete procedure.
• To assess the cecal intubation rate (CIR) in repeat colonoscopies.
• To evaluate the effectiveness of repeat colonoscopy in enabling therapeutic interventions.

Main Methods:

• Comprehensive literature search across major databases.
• Inclusion of studies on patients with failed initial colonoscopy (excluding poor bowel prep).
• Pooled rate calculation for variables and meta-regression analysis using Open Meta Analyst software.

Main Results:

• 26 studies with 1647 patients were analyzed.
• Pooled overall cecal intubation rate (CIR) for repeat colonoscopy was 95.7%.
• Specific CIRs: standard colonoscope (96.2%), single-balloon enteroscopy (96.8%), double-balloon enteroscopy (93%).

Conclusions:

• Repeat colonoscopy is highly effective, achieving a 95% cecal intubation rate.
• This procedure allows for the detection and therapeutic intervention of neoplasia and adenomas.
• Repeat colonoscopy offers a superior alternative to non-visualizing methods for incomplete procedures.