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Trial registered on ANZCTR
Registration number
ACTRN12612001091897
Ethics application status
Not yet submitted
Date submitted
11/10/2012
Date registered
12/10/2012
Date last updated
12/10/2012
Type of registration
Prospectively registered
Titles & IDs
Public title
Pupil fatigue: effectiveness of pupil-dilating drops
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Scientific title
Effectiveness of mydriatic drops on Dunedin Hospital Eye Department patients, when used on consecutive days
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Secondary ID [1]
281379
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None
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Universal Trial Number (UTN)
U1111-1133-3530
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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:
Pupil dilation for examination and/or surgery
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Condition category
Condition code
Eye
287939
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0
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Normal eye development and function
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Intervention/exposure
Study type
Interventional
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Description of intervention(s) / exposure
Participants will have pupil diameters measured using an infrared video pupillometer, and then have one drop of either a) tropicamide 1% alone, b) tropicamide 1% and phenylephrine 2.5% a few seconds apart, or c) cyclopentolate 1% and phenylephrine 2.5% a few seconds apart, instilled into one eye.
After an appropriate delay to allow action of the mydriatic agent (30 minutes except for cyclopentolate = 60 minutes), pupillometry will be performed again.
All participants except group c) (the 'control' group) will return the following day to have pupillometry performed again, then one drop each of cyclopentolate 1% and phenylephrine 2.5% will be instilled, and pupillometry repeated after 60 minutes.
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Intervention code [1]
285850
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Treatment: Drugs
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Intervention code [2]
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Early detection / Screening
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Comparator / control treatment
Control subjects will have their post-dilation pupil size measured without having had mydriatic drops used the previous day.
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Control group
Active
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Outcomes
Primary outcome [1]
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Pupil diameter post-dilation will be measured using an infrared video pupillometer (Neuroptics PLR 200).
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Assessment method [1]
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Timepoint [1]
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30 minutes, except for those who received cyclopentolate 1%, who will have pupil diameter measured at 60 minutes
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Secondary outcome [1]
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Increase in pupil diameter post-dilation will be calculated by subtracting pre-dilation pupil diameter (measured by infrared video pupillometer) from post-dilation pupil diameter.
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Assessment method [1]
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Timepoint [1]
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60 minutes
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Eligibility
Key inclusion criteria
Patients of the Dunedin Hospital Eye Department
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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
Previous surgery on study eye
On regular eye drops
History of intraocular inflammation in study eye
History of traumatic damage or congenital abnormality of anterior segment of study eye
Narrow drainage angles
Poorly controlled hypertension (>160/90mmHg)
Tachycardia (>90bpm)
Cardiac disease
Allergy to topical agents used in this study
Any physical or cognitive disability that prevents understanding or cooperation with requirements of study
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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)
Participants will be enrolled from those patients being seen at the Dunedin Hospital Eye Department, and will be allocated at random to one of two groups: a control group who will receive mydriatic drops on the study day only, and not be required to return the next day, and a 'treatment' group who will receive one of two combinations of mydriatic drops on the study day, and be required to return the following day for a further round of mydriatic drops. Allocation will not be concealed.
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Methods used to generate the sequence in which subjects will be randomised (sequence generation)
Random number generation by Excel software ((c) Microsoft Corporation, Washington, USA)
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Masking / blinding
Open (masking not 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
Not yet recruiting
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Date of first participant enrolment
Anticipated
2/11/2012
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Actual
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Date of last participant enrolment
Anticipated
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Actual
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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
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Recruitment outside Australia
Country [1]
4498
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New Zealand
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State/province [1]
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Otago
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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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University of Otago
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Address [1]
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Great King Street
PO Box 913
Dunedin 9054
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Country [1]
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New Zealand
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Primary sponsor type
University
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Name
University of Otago
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Address
Great King Street
PO Box 913
Dunedin 9054
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Country
New Zealand
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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]
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Country [1]
284943
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Ethics approval
Ethics application status
Not yet submitted
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Ethics committee name [1]
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Health and Disability Ethics Committee
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Ethics committee address [1]
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Ministry of Health
No 1 The Terrace
PO Box 5013
Wellington 6011
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Ethics committee country [1]
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New Zealand
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Date submitted for ethics approval [1]
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19/10/2012
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Approval date [1]
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Ethics approval number [1]
288179
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Summary
Brief summary
This study seeks to determine if the effectiveness of pupil-dilating drops is affected by their use the previous day
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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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Address
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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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Dr Logan Mitchell
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Address
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Department of Medicine
University of Otago Dunedin School of Medicine
Great King St
PO Box 913
Dunedin 9054
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Country
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New Zealand
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Phone
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+64 3 4740999
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Fax
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+64 3 4747641
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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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Dr Logan Mitchell
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Address
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Department of Medicine
University of Otago Dunedin School of Medicine
Great King St
PO Box 913
Dunedin 9054
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Country
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New Zealand
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Phone
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+64 3 4740999
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Fax
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+64 3 4747641
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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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