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Endoscopy. 2015 Mar;47(3):192-9. doi: 10.1055/s-0034-1390795. Epub 2014 Nov 20.

Water exchange versus carbon dioxide insufflation in unsedated colonoscopy: a multicenter randomized controlled trial.

Author information

1
Department of Medicine, Sorlandet Hospital HF, Kristiansand, Norway.
2
Department of Gastroenterological Oncology, Medical Center for Postgraduate Education and Institute of Oncology, Warsaw, Poland.
3
Department of Medicine, Sorlandet Hospital HF, Arendal, Norway.
4
Department of Pathology, Sorlandet Hospital HF, Kristiansand, Norway.
5
Institute of Health and Society, University of Oslo, Oslo, Norway.

Abstract

BACKGROUND AND STUDY AIMS:

Compared with air insufflation, water exchange and carbon dioxide (CO2) insufflation have been shown to reduce colonoscopy discomfort; however, head-to-head studies of the two methods are lacking. We aimed to compare water exchange and CO2 insufflation directly with regard to pain during primary unsedated colonoscopy.

METHODS:

Patients willing to undergo unsedated colonoscopy at three centers in Norway and Poland were randomized 1:1 to water exchange or CO2 insufflation during colonoscope insertion. Patients were blinded to group allocation. The primary end point was the proportion of patients reporting moderate or severe procedural pain on a 4-point verbal rating scale (VRS-4) at discharge. Secondary outcomes included the proportion of patients reporting no pain on the VRS-4.

RESULTS:

A total of 473 patients were randomized. A discharge pain questionnaire was completed by 226 of 234 patients (97 %) in the water exchange group versus 226 of 239 patients (95 %) in the CO2 group (P = 0.37). Moderate or severe pain was reported by 47 of 226 patients (21 %) in the water exchange group versus 60 of 226 patients (27 %) in the CO2 group (P = 0.15). No pain was reported by 100 of 226 patients (44 %) and 69 of 226 patients (31 %) in the water exchange and CO2 groups, respectively (P = 0.003). On-demand sedation was used in 15 patients (6 %) in each group (P = 0.95).

CONCLUSIONS:

There was no significant reduction in moderate or severe pain in a comparison of water exchange with CO2 insufflation. The secondary outcome of no pain was significantly more frequent in the water exchange group. Clinical trials registry number: NCT01633333.

PMID:
25412093
DOI:
10.1055/s-0034-1390795
[Indexed for MEDLINE]

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