• Magnus Løberg, Siv Furholm, Ingrid Hoff, Lars Aabakken, Geir Hoff, and Michael Bretthauer.
• The Cancer Registry of Norway, Oslo, Norway. magnus.loberg@gmail.com
• Gastrointest. Endosc. 2011 Dec 1;74(6):1347-53.

BackgroundColonoscopy is associated with pain and discomfort, and intravenous analgesics and sedatives are widely used. There are several disadvantages regarding this practice, including risk of complications, resources demanded, and amnesia after sedation. In spite of promising results in previous studies, nitrous oxide is rarely used at endoscopy centers around the world.ObjectiveTo investigate the efficiency of nitrous oxide versus placebo as an analgesic during colonoscopy without sedation.DesignA double-blind, randomized, placebo-controlled trial.SettingThe endoscopy unit at Oslo University Hospital Rikshospitalet, Oslo, Norway, between June 2006 and May 2008.PatientsThis study involved patients undergoing elective colonoscopy.InterventionPatients inhaled nitrous oxide or placebo on demand.Main Outcome MeasurementsThe participants filled in a questionnaire regarding their experiences with the examination. Pain was graded from 1 (no pain) to 4 (severe pain).ResultsWe recruited 199 patients. We randomized 97 patients to the nitrous oxide group and 102 to the control group. The groups were comparable regarding demographic factors. Median patient-reported pain was 2 in both the nitrous oxide group and the control group (interquartile range 2-3 in both groups). Additional sedatives and analgesics were given equally often and in similar doses in both groups. No side effects related to administration of nitrous oxide were reported.LimitationsThe questionnaire was returned by 76% of the patients. The study gas was given on demand, not continuously.ConclusionNitrous oxide given intermittently is not an effective substitution for intravenous on-demand sedation and analgesics in the setting of colonoscopy without sedation.Copyright © 2011 American Society for Gastrointestinal Endoscopy. Published by Mosby, Inc. All rights reserved.

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