Water infusion versus air insufflation for colonoscopy.

Area of Science:

• Gastroenterology
• Endoscopy
• Colorectal Cancer Screening

Background:

• Colonoscopy is a vital procedure for diagnosing and treating colorectal diseases and for cancer screening.
• Traditional air insufflation can cause discomfort, potentially impacting patient acceptance and procedure completion.
• Water infusion during colonoscopy insertion is explored to mitigate pain and potentially improve lesion detection.

Purpose of the Study:

• To compare the technical quality, screening efficacy, and patient acceptance of water infusion colonoscopy versus standard air insufflation.
• To evaluate the impact of water infusion on adenoma detection rates and patient-reported pain.

Main Methods:

• Systematic review and meta-analysis of 16 randomized controlled trials involving 2933 colonoscopies.
• Searched major databases including Cochrane, MEDLINE, EMBASE, and ClinicalTrials.gov for eligible studies.
• Compared water infusion techniques (exchange or immersion) against standard air insufflation during colonoscopy insertion.

Main Results:

• Cecal intubation rates (colonoscopy completeness) were similar between water infusion and air insufflation (RR 1.00, 95% CI 0.97-1.03).
• Adenoma detection rates were slightly improved with water infusion (RR 1.16, 95% CI 1.04-1.30), potentially detecting 3 more adenomas per 100 patients.
• Water infusion significantly reduced patient-reported pain (MD -1.57, 95% CI -2.00 to -1.14) and the need for sedation/analgesia (RR 1.20, 95% CI 1.14-1.27).

Conclusions:

• Water infusion colonoscopy does not improve the completeness of the procedure but slightly enhances adenoma detection.
• The reduction in patient pain and need for sedation suggests improved acceptance of water infusion colonoscopy.
• Enhanced detection of premalignant lesions may help reduce interval colorectal cancers, making water infusion a valuable alternative.