Completed

Isoflurane at Subanesthetic Concentrations - 6

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What is being tested

40% Nitrous oxide

+ Sham comparator
+ 0.2% isoflurane
Drug
Other
Who is being recruted

Opioid-Related Disorders

+ Substance-Related Disorders
From 21 to 34 Years

See all eligibility criteria

How is the trial designed

Treatment Study

Placebo-Controlled
Phase 2
Interventional
Study Start: January 1995

See protocol details

Summary

Principal SponsorUniversity of Chicago
Last updated: May 28, 2015
Sourced from a government-validated database.Claim as a partner
Study start date: January 1, 1995Actual date on which the first participant was enrolled.

The purpose of this study is to conduct experiments to examine subjective and reinforcing effects of nitrous oxide. Mood altering and psychomotor effects will be tested on non-drug abusers and preference procedures will be used to assess reinforcing effects. To test the hypothesis that isoflurane at subanesthetic concentrations does not reduce cold-water immersion pain in healthy volunteers.

Official TitleIsoflurane at Subanesthetic Concentrations 
Principal SponsorUniversity of Chicago
Last updated: May 28, 2015
Sourced from a government-validated database.Claim as a partner

Protocol

This section provides details of the study plan, including how the study is designed and what the study is measuring.
Design Details
10 patients to be enrolledTotal number of participants that the clinical trial aims to recruit.
Treatment Study
These studies test new ways to treat a disease, condition, or health issue. The goal is to see if a new drug, therapy, or approach works better or has fewer side effects than existing options.

How participants are assigned to different groups/arms
In this clinical study, participants are placed into groups randomly, like flipping a coin. This ensures that the study is fair and unbiased, making the results more reliable. By assigning participants by chance, researchers can better compare treatments without external influences.

Other Ways to Assign Participants
Non-randomized allocation: Participants are assigned based on specific factors, such as their medical condition or a doctor's decision.
None (Single-arm trial): If the study has only one group, all participants receive the same treatment, and no allocation is needed.

How treatments are given to participants
Participants receive different treatments one after the other, switching from one to another during the study. This helps researchers understand how individuals respond to multiple treatments.

Other Ways to Assign Treatments
Single-group assignment: Everyone gets the same treatment.
Parallel assignment: Participants are split into separate groups, each receiving a different treatment.
Factorial assignment: Participants receive different combinations of treatments.
Sequential assignment: Participants receive treatments one after another in a specific order, possibly based on individual responses.
Other assignment: Treatment assignment does not follow a standard or predefined design.

How the effectiveness of the treatment is controlled
In a placebo-controlled study, some participants receive the experimental treatment, while others receive an inert substance (placebo) to compare outcomes. This method helps to isolate the effect of the treatment from the psychological effects of receiving any treatment at all.

Other Options
Non-placebo-controlled: No placebo is used. All participants receive the actual treatment or alternative interventions (often the Standard of Care), and comparisons are made between these treatments.

How the interventions assigned to participants is kept confidential
Participants do not know which treatment they are receiving, but researchers do. This helps prevent bias from participants' expectations while still allowing researchers to monitor the study closely.

Other Ways to Mask Information
Open-label: Everyone knows which treatment is being given.
Double-blind: Neither participants nor researchers know which treatment is given.
Triple-blind: Participants, researchers, and outcome assessors do not know which treatment is given.
Quadruple-blind: Participants, researchers, outcome assessors, and care providers all do not know which treatment is given.

Eligibility

Researchers look for people who fit a certain description, called eligibility criteria: person's general health condition or prior treatments.
Conditions
Criteria
MaleBiological sex of participants that are eligible to enroll.
From 21 to 34 YearsRange of ages for which participants are eligible to join.
Healthy volunteers allowedIf individuals who are healthy and do not have the condition being studied can participate.
Conditions
Pathology
Opioid-Related Disorders
Substance-Related Disorders
Criteria

Please contact site for information.

Study Plan

Find out more about all the medication administered in this study, their detailed description and what they involve.
Treatment Groups
Study Objectives
4 intervention groups 

are designated in this study

25% chance 

of being blinded to the placebo group

Treatment Groups
Group I
Sham
Group II
Active Comparator
Group III
Active Comparator
Group IV
Active Comparator
Study Objectives
Primary Objectives

Effects of inhaled isoflurane on pain from immersion of subject's arm in ice cold water. Nitrous oxide (40%) was used as a positive control to confirm sensitivity of the pain assay.

Study Centers

These are the hospitals, clinics, or research facilities where the trial is being conducted. You can find the location closest to you and its status.
This study has 1 location
Suspended
University of Chicago, Anesthesia & Critical CareChicago, United StatesSee the location
CompletedOne Study Center