Nitrous oxide for colonoscopy: a randomized controlled study.

Abstract:

BACKGROUND:Intravenous sedation/analgesia for colonoscopy is accompanied with certain risks and postprocedure drowsiness. We sought to determine whether inhaled nitrous oxide (Entonox: 50% nitrous oxide, 50% oxygen) provides adequate analgesia for colonoscopy and the impact of this agent on recovery. METHODS:All patients undergoing outpatient colonoscopy were considered for the study (n = 248) except those with previous colonic resection. Data for patients unsuitable for randomization (n = 58) and those who declined to participate (n = 88) were also analyzed. RESULTS:One hundred two patients were randomized to receive inhaled Entonox alone (n = 56) or intravenous midazolam and meperidine (n = 46). Forty-nine (88%) patients randomized to Entonox underwent complete colonoscopy without conversion to intravenous medications. Entonox patients reported more pain (p < 0.0001), tolerated colonoscopy less well (p < 0.0001), were less satisfied (p = 0.01), and less willing to undergo colonoscopy again under the same circumstances (p = 0.04). Of patients receiving intravenous medication, 91% found colonoscopy less unpleasant and 9% as unpleasant as anticipated; this compares with 52% and 21% Entonox patients, respectively, and an additional 27% Entonox patients who found colonoscopy more unpleasant than anticipated. Recovery was faster among Entonox patients (median 30 versus 60 minutes, p < 0.0001). CONCLUSION:Entonox is less effective than midazolam with meperidine for colonoscopy but is acceptable in many patients and allows faster recovery.

journal_name

Gastrointest Endosc

authors

Forbes GM,Collins BJ

doi

10.1016/s0016-5107(00)70354-3

keywords:

subject

Has Abstract

pub_date

2000-03-01 00:00:00

pages

271-7

issue

3

eissn

0016-5107

issn

1097-6779

pii

S0016-5107(00)70354-3

journal_volume

51

pub_type

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