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Trial registered on ANZCTR
Registration number
ACTRN12608000272392
Ethics application status
Approved
Date submitted
27/05/2008
Date registered
29/05/2008
Date last updated
26/11/2015
Type of registration
Prospectively registered
Titles & IDs
Public title
A Study of Methods to Reduce Anxiety in Preoperative Elective Surgical Patients
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Scientific title
Forced-air warming, midazolam or control prevention of anxiety as measured by a 100-mm visual analog scale in patients presenting for elective non-cardiac surgery.
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Secondary ID [1]
288007
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nil known
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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:
Preoperative anxiety
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Condition category
Condition code
Anaesthesiology
3358
3358
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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
Reassurance, cotton blanket, saline injection (2 ml at time 0); Reassurance, cotton blanket, midazolam injection (0.3 mg/kg i.v. at time 0); Reassurance, forced-air warming blanket, midazolam injection (0.3 mg/kg at time 0). Reassurance and cotton blanket or forced air warming blanket applied from time 0 to time 20. Study conducted in the 20 minutes prior to induction of anaesthesia.
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Intervention code [1]
2941
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Prevention
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Comparator / control treatment
Reassurance, cotton blanket, saline injection (2 ml at time 0)
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Control group
Active
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Outcomes
Primary outcome [1]
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Visual analog score for anxiety on 100-mm scale
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Assessment method [1]
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Timepoint [1]
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From admission to anaesthetic room to discharge from recovery room
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Secondary outcome [1]
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Thermal comfort during preoperative treatment (100 mm visual analog scale)
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Assessment method [1]
7173
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Timepoint [1]
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During immediate preoperative phase
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Secondary outcome [2]
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Times to eyes open after surgery
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Assessment method [2]
7174
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Timepoint [2]
7174
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During stay in recovery room
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Eligibility
Key inclusion criteria
Patients aged between 18 and 70 years, male and female
Presenting for elective surgery
Requiring general anaesthesia
American Society of Anesthesiologists' physical status score 1-3
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Minimum age
18
Years
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Maximum age
70
Years
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Sex
Both males and females
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Can healthy volunteers participate?
No
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Key exclusion criteria
Cardiothoracic and intracranial surgery
Day case surgery
Pre-existing anxiety disorder
Patients on psychotropic drugs preoperatively
Febrile patients T > 37.5 degrees Celsius
Allergy to midazolam
Obstructive Sleep Apnoea diagnosed on sleep study
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Study design
Purpose of the study
Prevention
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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
Blinded (masking used)
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Who is / are masked / blinded?
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Intervention assignment
Parallel
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Other design features
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Phase
Phase 4
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Type of endpoint/s
Efficacy
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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
1/07/2008
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Actual
7/08/2008
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Date of last participant enrolment
Anticipated
20/03/2009
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Actual
3/04/2009
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Date of last data collection
Anticipated
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Actual
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Sample size
Target
90
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Accrual to date
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Final
120
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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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Self funded/Unfunded
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Name [1]
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Melbourne Health
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Address [1]
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Royal Melbourne Hospital
Parkville, VIC, 3050
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Country [1]
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Australia
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Primary sponsor type
Hospital
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Name
Melbourne Health
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Address
Royal Melbourne Hospital
Parkville, VIC, 3050
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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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Address [1]
3071
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Country [1]
3071
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Ethics approval
Ethics application status
Approved
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Ethics committee name [1]
5455
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Ethics committee address [1]
5455
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Ethics committee country [1]
5455
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Date submitted for ethics approval [1]
5455
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27/05/2008
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Approval date [1]
5455
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Ethics approval number [1]
5455
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HREC 2008.074
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Ethics committee name [2]
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Melbourne Health HREC
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Ethics committee address [2]
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Royal Melbourne Hospital Parkville VIC 3050
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Ethics committee country [2]
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Australia
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Date submitted for ethics approval [2]
293927
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27/05/2008
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Approval date [2]
293927
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07/08/2008
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Ethics approval number [2]
293927
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Nil known
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Summary
Brief summary
We tested the hypothesis that pre-operative forced-air warming is as effective for anxiolysis as intravenous midazolam, using a blinded, placebo controlled factorial design. One hundred and twenty patients were randomly assigned to cotton blanket and saline injection (n = 30), forced-air warmer and saline injection (n = 30), midazolam 30 lg.kg)1 and cotton blanket (n = 30), and forced-air warmer and midazolam 30 lg.kg)1 (n = 30). Patients completed visual analogue scales for anxiety and thermal comfort, and the State-Trait Anxiety Inventory, at baseline and after 20 min. The estimated effect of midazolam on visual analogue scores for anxiety was )10 (95% CI )3 to )18; p = 0.007) and on state anxiety was )5 (95% CI )7 to )4; p = 0.03). Warming had no influence on visual analogue scores for anxiety (p = 0.50) or state anxiety (p = 0.33), but its estimated effect on thermal comfort was +23 (95% CI 19–27; p < 0.0001). There was no interaction between midazolam and warming. Pre-operative warming was not equivalent to midazolam for anxiolysis and cannot be recommended solely for this purpose.
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Trial website
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Trial related presentations / publications
Wen R, LESLIE K, Rajendra P. Pre-operative forced-air warming as a method of anxiolysis. Anaesthesia 2009; 64: 1077-80
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Public notes
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Contacts
Principal investigator
Name
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Prof Kate Leslie
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Address
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Department of Anaesthesia and Pain Management
Royal Melbourne Hospital
Parkville VIC 3050
Australia
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Country
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Australia
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Phone
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61-3-93427540
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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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Kate Leslie
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Address
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Royal Melbourne Hospital
Parkville VIC 3050
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Country
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Australia
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Phone
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+61-3-93427000
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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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Kate Leslie
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Address
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Royal Melbourne Hospital
Parkville VIC 3050
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Country
2707
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Australia
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Phone
2707
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+61-3-93427000
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Fax
2707
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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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