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Trial registered on ANZCTR
Registration number
ACTRN12612000888864
Ethics application status
Approved
Date submitted
20/08/2012
Date registered
21/08/2012
Date last updated
17/07/2018
Type of registration
Prospectively registered
Titles & IDs
Public title
Effects of inhaled xenon and nitrous oxide on brain activity recorded using magnetoencephalography (MEG) and electroencephalography (EEG)
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Scientific title
A repeated measures cross-over design trial to compare the subanaesthetic actions of xenon and nitrous anaesthesia in healthy male participants using magnetoencephalography (MEG) and electroencephalography (EEG)
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Secondary ID [1]
281043
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Nil
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Universal Trial Number (UTN)
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Trial acronym
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Linked study record
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Health condition
Health condition(s) or problem(s) studied:
sedation
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loss of consciousness
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Condition category
Condition code
Anaesthesiology
287509
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0
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Anaesthetics
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Intervention/exposure
Study type
Interventional
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Description of intervention(s) / exposure
Participants will be administered nitrous oxide and xenon in separate experimental sessions. Each experimental session will be separated by a period of 1 week to allow for washout of respective gas effects. Participants will be randomized to initially receive step-wise inhaled concentrations of either nitrous oxide or xenon. Nitrous oxide will be administered as a sequence of 3 inspired concentrations of 16%, 32% and 47% each lasting for 15 minutes and each separated by a period of 5 minutes of 100% oxygen. Xenon will be administered as a sequence of 3 inspired concentrations of 8%, 16% and 24% each lasting for 15 minutes and each separated by a period of 5 minutes of 100% oxygen followed by Xenon administered at an inspired concentration of 42% until loss of response to a vocal command.
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Intervention code [1]
285504
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Diagnosis / Prognosis
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Comparator / control treatment
All recordings during nitrous oxide and xenon administration will be compared with 5 minute recordings obtained while participants freely breath room air prior to the commencement of each of the respective gas administrations. Both xenon and nitrous oxide treament groups will have equal weight in this trial.
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Control group
Active
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Outcomes
Primary outcome [1]
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Recorded high density electroencephalographic activity
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Assessment method [1]
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Timepoint [1]
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At baseline, during all administered levels of xenon and nitrous oxide and at loss of response during xenon administration
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Primary outcome [2]
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Recorded magnetoencephalographic activity
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Assessment method [2]
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Timepoint [2]
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At baseline, during all administered levels of xenon and nitrous oxide and at loss of response during xenon administration
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Secondary outcome [1]
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% correct response and latency of response to continuous auditory performance task
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Assessment method [1]
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Timepoint [1]
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At baseline, during all administered levels of xenon and nitrous oxide
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Eligibility
Key inclusion criteria
Healthy males aged 18 - 40 years
Non-smoker
Right handed
Able to read, write and speak English
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Minimum age
18
Years
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Maximum age
40
Years
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Sex
Males
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Can healthy volunteers participate?
Yes
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Key exclusion criteria
A history of epilepsy or other neurological condition
A history of depression, anxiety or other psychiatric illness
Asthma or other respiratory illness
Obstructive sleep apnoea or severe snoring
A history of alcohol or drug abuse
Taken any pharmaceutical product/medicine in the last 30 days prior to first gas administration session
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Study design
Purpose of the study
Diagnosis
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Allocation to intervention
Randomised controlled trial
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Procedure for enrolling a subject and allocating the treatment (allocation concealment procedures)
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Methods used to generate the sequence in which subjects will be randomised (sequence generation)
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Masking / blinding
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Who is / are masked / blinded?
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Intervention assignment
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Other design features
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Phase
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Type of endpoint/s
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Statistical methods / analysis
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Recruitment
Recruitment status
Completed
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Date of first participant enrolment
Anticipated
1/09/2012
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Actual
19/10/2015
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Date of last participant enrolment
Anticipated
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Actual
21/11/2017
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Date of last data collection
Anticipated
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Actual
28/11/2017
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Sample size
Target
20
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Accrual to date
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Final
20
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Recruitment in Australia
Recruitment state(s)
VIC
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Funding & Sponsors
Funding source category [1]
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University
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Name [1]
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Swinburne University of Technology
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Address [1]
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PO Box 218
Hawthorn VIC 3122
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Country [1]
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Australia
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Primary sponsor type
University
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Name
Swinburne University of Technology
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Address
PO Box 218
Hawthorn VIC 3122
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Country
Australia
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Secondary sponsor category [1]
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None
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Name [1]
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Nil
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Address [1]
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Nil
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Country [1]
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Australia
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Ethics approval
Ethics application status
Approved
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Ethics committee name [1]
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Alfred Hospital Ethics Committee
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Ethics committee address [1]
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Ethics committee country [1]
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Australia
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Date submitted for ethics approval [1]
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Approval date [1]
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20/08/2012
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Ethics approval number [1]
287867
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Summary
Brief summary
Despite many decades of effective and safe use the mechanisms by which anaesthetics induce unconsciousness remain unresolved. While our knowledge of the molecular and cellular targets of anaesthetic action has increased substantially in the last couple of decades our knowledge regarding their effects on measured brain activity has progressed at a slower rate. The aim of this study is, for the first time, to use a high resolution method of brain imaging to better quantify the effects anaesthetic agents have on brain activity. Specifically we will quantify the effects of two volatile anaesthetic agents, nitrous oxide and xenon, on brain activity recorded using a high resolution brain imaging technique known as magnetoencephalography. These agents are chosen because of their reported differing effects on brain activity, their reported similar molecular targets of action and the fact that they are safe to administer in a research imaging environment.
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Trial website
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Trial related presentations / publications
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Public notes
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Contacts
Principal investigator
Name
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Prof David Liley
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Address
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Centre for Human Pyschopharmacology,
Swinburne University of Technology
Hawthorn VIC 3122
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Country
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Australia
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Phone
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+61392148812
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Fax
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Email
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[email protected]
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Contact person for public queries
Name
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Prof Professor David Liley
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Address
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Brain and Psychological Sciences Research Centre
Swinburne University of Technology
Hawthorn VIC 3122
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Country
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Australia
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Phone
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+61-3-9214 8812
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Fax
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Email
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[email protected]
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Contact person for scientific queries
Name
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Prof Professor David Liley
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Address
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Brain and Psychological Sciences Research Centre
Swinburne University of Technology
Hawthorn VIC 3122
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Country
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Australia
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Phone
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+61-3-9214 8812
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Fax
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Email
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[email protected]
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No information has been provided regarding IPD availability
What supporting documents are/will be available?
No Supporting Document Provided
Results publications and other study-related documents
Documents added manually
No documents have been uploaded by study researchers.
Documents added automatically
No additional documents have been identified.
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