A second look at colonoscopy: indications, failures, and costs

Area of Science:

• Gastroenterology
• Endoscopic Medicine

Background:

• Colonoscopy and colonoscopic polypectomy are crucial diagnostic and therapeutic procedures.
• Despite accumulated experience, certain failure rates persist in colonoscopic examinations.

Purpose of the Study:

• To review the outcomes of colonoscopy and colonoscopic polypectomy in a large patient cohort.
• To assess the impact of experience on procedural success rates and identify persistent challenges.
• To evaluate the efficacy of diagnostic colonoscopy in specific patient populations.

Main Methods:

• Retrospective review of colonoscopy and colonoscopic polypectomy results in 599 patients.
• Analysis of failure rates including incomplete colon examination, lost polyps, missed lesions, and false-negative biopsies.
• Evaluation of diagnostic yield for colonoscopy in patients with unexplained rectal bleeding.

Main Results:

• Procedural experience did not significantly reduce failure rates such as missed lesions or incomplete colon exams.
• Invasive carcinoma incidence in polyps <1 cm is <1%; polypectomy is advised for larger or growing polyps.
• Diagnostic colonoscopy identified causative lesions in >25% of selected patients with persistent bleeding, detecting cancer in 5-10%.

Conclusions:

• Colonoscopy and polypectomy continue to face challenges in examination completeness and lesion detection.
• Polypectomy guidelines should prioritize larger or growing polyps due to low invasive cancer risk in smaller ones.
• Diagnostic colonoscopy is valuable for investigating unexplained rectal bleeding, revealing significant pathology in a notable percentage of cases.