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Trial registered on ANZCTR
Registration number
ACTRN12610000311055
Ethics application status
Approved
Date submitted
15/04/2010
Date registered
19/04/2010
Date last updated
2/07/2018
Type of registration
Retrospectively registered
Titles & IDs
Public title
Retinal Artery Study in participants with obstructive sleep apnoea treated with continuous positive airway pressure
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Scientific title
A pilot, randomised controlled trial of retinal artery flicker induced vasodilatation to detect change in endothelial function in participants with obstructive sleep apnoea treated with continuous postitive airway pressure for 6 weeks.
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Secondary ID [1]
251620
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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:
Endothelial function
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Sleep Apnoea
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Condition category
Condition code
Cardiovascular
257320
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0
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Diseases of the vasculature and circulation including the lymphatic system
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Respiratory
257352
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0
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Sleep apnoea
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Intervention/exposure
Study type
Interventional
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Description of intervention(s) / exposure
6 weeks Continuous Positive Airway Pressure (CPAP) individually titrated and fitted for use during sleep.
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Intervention code [1]
256318
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Treatment: Devices
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Comparator / control treatment
No CPAP treatment for 6 weeks
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Control group
Active
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Outcomes
Primary outcome [1]
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The Dynamic Vessel Analyzer (IMEDOS, Germany) is used to measure retinal vascular endothelial function. Changes in ocular haemodynamic parameters expressed as the percentage change over baseline values in response to flicker light stimulation.
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Assessment method [1]
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Timepoint [1]
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After 6 weeks of treatment with CPAP or no CPAP
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Secondary outcome [1]
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Nil
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Assessment method [1]
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Timepoint [1]
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Nil
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Eligibility
Key inclusion criteria
Moderate to severe Obstructive Sleep Apnoea(OSA) - Apnoea Hypopnoea Index greater than or equal to 30, with associated hypoxaemia – Oxygen saturation(Sa O2) <90% for a minimumm of 6% of total sleep time.
Actual coronary artery disease or two or more of the following cardiovascular risk factors – hypertension, dyslipidaemia, diabetes, smoking, positive family history.
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Minimum age
18
Years
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Maximum age
No limit
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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
Commercial driver or patients listed for urgent CPAP implementation.
Glaucoma
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Study design
Purpose of the study
Treatment
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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)
1. sealed opaque envelopes
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Methods used to generate the sequence in which subjects will be randomised (sequence generation)
Simple randomisation by using a randomization table created by a computer software
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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
Not Applicable
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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
15/04/2010
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Actual
15/04/2010
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Date of last participant enrolment
Anticipated
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Actual
31/12/2010
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Date of last data collection
Anticipated
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Actual
1/06/2011
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Sample size
Target
30
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Accrual to date
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Final
30
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Recruitment in Australia
Recruitment state(s)
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Funding & Sponsors
Funding source category [1]
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Charities/Societies/Foundations
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Name [1]
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Austin Hospital Medical Research Foundation
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Address [1]
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Studley Road
Heidelberg VIC 3084
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Country [1]
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Australia
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Primary sponsor type
Other Collaborative groups
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Name
Austin Health Department of Cardiology and Institute for Breathing and Sleep
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Address
Studley Road
Heidelberg VIC 3084
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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]
256098
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Country [1]
256098
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Ethics approval
Ethics application status
Approved
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Ethics committee name [1]
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Austin Health
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Ethics committee address [1]
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Studley Road
Heidelberg VIC 3084
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Ethics committee country [1]
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Australia
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Date submitted for ethics approval [1]
258840
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Approval date [1]
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15/12/2009
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Ethics approval number [1]
258840
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H2009/03772
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Summary
Brief summary
Evidence has accumulated that changes to the tiny blood vessels at the back of the eye (retinal arteries) are linked to heart disease. It is possible to use a simple eye examination to view these tiny retinal blood vessels and get an idea about their condition. This kind of examination is simple to perform and is not invasive. Because there are similarities to blood vessels throughout the body, an eye examination could be used to provide important information about blood vessel condition in general and whether certain treatments can result in improved blood vessel function.
This study will examine the retinal arteries of a group of patients with Obstructive Sleep Apnoea and risk factors for or actual heart disease. It will also look for evidence that the function of the retinal arteries improves with Continuous Positive Airway Pressure (CPAP) treatment
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Trial website
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Trial related presentations / publications
None
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Public notes
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Contacts
Principal investigator
Name
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Address
31057
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Country
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Phone
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Fax
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Email
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Contact person for public queries
Name
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Allison Collins
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Address
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Institute for Breathing and Sleep
Bowen Centre
Austin Health
Studley Road Heidelberg VIC 3084
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Country
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Australia
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Phone
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+61 3 9496 5756
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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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Allison Collins
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Address
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Institute for Breathing and Sleep
Bowen Centre
Austin Health
Studley Road Heidelberg VIC 3084
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Country
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Australia
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Phone
5232
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+61 3 9496 5756
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Fax
5232
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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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