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Can Nitrous Oxide (Laughing Gas) be Used as a Sedative for GI Endoscopy Procedures?

Evaluation of Nitrous Oxide Use in GI Endoscopy Procedures: Potential for Optimizing Sedation and Minimizing Side-Effects During Recovery

Status
Withdrawn
Phases
Phase 4
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT05396144
Enrollment
0
Registered
2022-05-31
Start date
2024-05-01
Completion date
2025-08-31
Last updated
2026-03-27

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Colonoscopy, Endoscopy

Keywords

sedative

Brief summary

Nitrous oxide (commonly known as 'laughing gas') is often used during dental and other outpatient procedures, because it is easy to administer, is short-acting and rapidly clears from the body following the procedure. The investigators hypothesize that use of Nitrous oxide during GI endoscopy may enhance patient comfort during the procedure and speed-up post-procedure recovery, while minimizing the fatigue and mental fogginess some patients report the day after receiving standard sedative and narcotic drugs used routinely for the procedure. The investigators are interested in determining if adding Nitrous Oxide to commonly used sedation drugs will decrease fatigue, mental fogginess, and nausea/vomiting, as well as determine when the patient felt fully recovered from the effects of all sedatives given for the procedure.

Interventions

DRUG5% inhaled nitrous oxide

5% Nitrous oxide will be administered by face or nasal mask to be inhaled by the patient

DRUG50% inhaled nitrous oxide

50% Nitrous oxide will be administered by face or nasal mask to be inhaled by the patient

Sponsors

Stanford University
Lead SponsorOTHER

Study design

Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
DOUBLE (Subject, Caregiver)

Masking description

The patient and healthcare providers (e.g. gastroenterologist performing the procedure and nurse administering conscious sedation) will not know if the patient is receiving either 5% or 50% inhaled nitrous oxide

Intervention model description

Patients will be randomized to either receive 5% or 50% inhaled nitrous oxide in addition to typical sedative agents which will be given at the direction of the doctor performing the procedure. There is a 50% chance you will be assigned to receive either 5% or 50% nitrous oxide

Eligibility

Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No

Inclusion criteria

* Non-pregnant patients age 18 and older * Patient's presenting for upper endoscopy or colonoscopy under endoscopist- directed nurse sedation. * Patient is willing and able to consent and comply with study procedures.

Exclusion criteria

* Age \<18 * Potentially vulnerable subjects including, homeless people, pregnant females, employees and students. * Participation in another investigational study that may directly or indirectly affect the results of this study within 30 days prior to the initial visit * Allergy to the proposed anesthetic agents (e.g. nitrous oxide, midazolam, fentanyl, diphenhydramine)

Design outcomes

Primary

MeasureTime frameDescription
Intravenous sedative drugDuration of the procedure (1-2 hours)Tabulate the types and dosages of intravenous sedative drugs given
Recovery timeDuration of the procedure (1-3hours)Time spent in procedure room to recover
Patient comfortDuration of the procedure (1-3hours)Patient comfort rating intra-procedure using standardized scale
Fatigue24-36 hoursThe number of patients who experienced fatigue
Nausea/vomiting24-36 hoursNumber of patients who experienced nausea/vomiting
Mental Fogginess post-procedure/sedation24-36 hoursDuration of mental fogginess following the procedure/sedation
Return to baseline function24-36 hoursNumber of hours post-procedure/sedation for patient to return to baseline function

Countries

United States

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Mar 28, 2026