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A meta-analysis of carbon dioxide versus room air insufflation on patient comfort and key performance indicators at colonoscopy

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International Journal of Colorectal Disease Aims and scope Submit manuscript

Abstract

Background

Carbon dioxide (CO2) has been used as an alternative to air insufflation at endoscopy with good results; however, uptake of the technique has been poor, possibly due to perceived lack of outcome equivalency. This meta-analysis evaluates the effectiveness of CO2 versus air in reducing pain post-colonoscopy and furthermore examines other key performance indicators (KPIs) such as sedative use, procedure times and polyp detection rates.

Methods

This meta-analysis was performed using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. Pubmed, Pubmed Central, Embase and Cochrane Library were searched for randomized studies from 2004 to 2019, reporting outcomes for patients undergoing colonoscopy with air or CO2 insufflation, who reported pain on a numerical or visual analogue scale (VAS). Results were reported as mean differences (MD) or pooled odds ratios (OR) with 95% confidence intervals (95% CI).

Results

Of 3586 citations, 23 studies comprising 3217 patients were analysed. Patients undergoing colonoscopy with air insufflation had 30% higher intraprocedural pain scores than those receiving CO2 (VAS 3.4 versus 2.6, MD -0.7, 95% CI − 1.4–0.0, p = 0.05), with a sustained beneficial effect amongst those in the CO2 group at 30 min, 1–2-h and 6-h post procedure (MD − 0.8, − 0.6 and − 0.2, respectively, p < 0.001 for all), as well as less distension, bloating and flatulence (p < 0.01 for all). There were no differences between the two groups in KPIs such as the sedation required, procedure time, caecal intubation or polyp detection rates.

Conclusions

CO2 insufflation improves patient comfort without compromising colonoscopic performance.

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Authors and Affiliations

  1. Department of Colorectal Surgery, St. Vincent’s University Hospital, Dublin, Ireland

    Ailín C Rogers, Dayna Van De Hoef, Shaheel M Sahebally & Des C Winter

  2. Centre for Colorectal Disease, University College Dublin, Dublin, Ireland

    Ailín C Rogers, Dayna Van De Hoef, Shaheel M Sahebally & Des C Winter

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  1. Ailín C Rogers
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Supplementary Figure 1

Forest plots for meta-analysis results of effects of CO2 versus air insufflation during colonoscopy on key performance indicators. A) Sedative approach – propofol. B) Sedative approach – midazolam. C) Procedure time. D) Caecal intubation time. E) Polyp detection rate. F) Polypectomy rate (PNG 129 kb)

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Rogers, A.C., Van De Hoef, D., Sahebally, S.M. et al. A meta-analysis of carbon dioxide versus room air insufflation on patient comfort and key performance indicators at colonoscopy. Int J Colorectal Dis 35, 455–464 (2020). https://doi.org/10.1007/s00384-019-03470-4

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