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Trial registered on ANZCTR
Registration number
ACTRN12614000142639
Ethics application status
Approved
Date submitted
31/01/2014
Date registered
5/02/2014
Date last updated
5/02/2014
Type of registration
Retrospectively registered
Titles & IDs
Public title
Effects of intravenous caffeine on Fractional Flow Reserve measurements in coronary artery disease
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Scientific title
To compare fractional flow reserve (FFR) before and after intravenous caffeine administration in coronary artery disease patients to evaluate effect of caffeine on FFR levels
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Secondary ID [1]
284021
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Nil
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Universal Trial Number (UTN)
U1111-1152-8715
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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:
Coronary artery disease
291062
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Ischaemic heart disease
291083
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Condition category
Condition code
Cardiovascular
291405
291405
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0
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Coronary heart disease
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Intervention/exposure
Study type
Interventional
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Description of intervention(s) / exposure
Fractional flow reserve measurements performed as clinically required.
intravenous caffeine administration 4mg/kg (maximum 400 mg IV)
Repeat fractional flow reserve measurements 10 minutes after caffeine administration
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Intervention code [1]
288707
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Diagnosis / Prognosis
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Comparator / control treatment
Patients prior FFR measurements serve as control measurement, second FFR measurement done post caffeine administration
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Control group
Uncontrolled
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Outcomes
Primary outcome [1]
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Any statistical significant change FFR measurements after caffeine administration.
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Assessment method [1]
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Timepoint [1]
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After completion of second FFR measurement.
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Secondary outcome [1]
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Any clinically significant change in FFR measurements. (defined as crossing cutoff values of 0.80; i.e.: decrease in FFR above 0.80 to below 0.80)
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Assessment method [1]
306661
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Timepoint [1]
306661
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After completion of second FFR measurement.
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Eligibility
Key inclusion criteria
Moderate coronary artery disease requiring FFR measurements.
FFR measurement <0.90
Valid consent
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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
Inability to give informed consent
Caffeine contraindicated
Adenosine contraindicated
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Study design
Purpose of the study
Diagnosis
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Allocation to intervention
Non-randomised trial
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Procedure for enrolling a subject and allocating the treatment (allocation concealment procedures)
As patients serve as their own control; no allocation concealment procedures will need to be applied.
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Methods used to generate the sequence in which subjects will be randomised (sequence generation)
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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
Single group
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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
Students T test will be used to compare two groups (pre and post caffeine administration.)
This is a proof of concept trial ; and will help determine number needed for a larger randomised trial
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Recruitment
Recruitment status
Completed
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Date of first participant enrolment
Anticipated
1/11/2011
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Actual
5/12/2011
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Date of last participant enrolment
Anticipated
1/03/2012
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Actual
15/06/2012
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Date of last data collection
Anticipated
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Actual
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Sample size
Target
10
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Accrual to date
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Final
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Recruitment in Australia
Recruitment state(s)
VIC
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Recruitment hospital [1]
2030
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The Northern Hospital - Epping
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Recruitment postcode(s) [1]
7731
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3076 - Epping
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Funding & Sponsors
Funding source category [1]
288647
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Hospital
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Name [1]
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The Northern Hospital
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Address [1]
288647
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185 Cooper Street
Epping Vic 3076
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Country [1]
288647
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Australia
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Primary sponsor type
Hospital
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Name
The Northern Hospital
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Address
185 Cooper Street
Epping Vic 3076
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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]
287358
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Address [1]
287358
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Country [1]
287358
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Ethics approval
Ethics application status
Approved
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Ethics committee name [1]
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The Northern Health HREC
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Ethics committee address [1]
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185 Cooper Street
Epping vic 3076
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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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01/11/2011
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Approval date [1]
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18/11/2011
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Ethics approval number [1]
290498
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P18/11
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Summary
Brief summary
Intravenous adenosine is used to minimize the coronary micro-resistance to achieve maximal hyperemia along with nitrates for optimal fractional flow reserve (FFR) measurements. We hypothesize that caffeine, being a competitive inhibitor of adenosine, would influence adenosine mediated FFR readings.
Consecutive patients undergoing angiogram and FFR measurements were enrolled after abstaining from caffeine for 24 hours. Patients with any contraindications to intravenous adenosine or caffeine were excluded. FFR measurements were taken using nitrates and adenosine pre and post 4mg/kg intravenous caffeine administration and results were compared.
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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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A/Prof William J van Gaal
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Address
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The Northern Hospital
185 Cooper street
Epping
Vic 3076
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Country
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Australia
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Phone
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+61384058389
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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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Dr Vivek Mutha
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Address
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The Northern Hospital
185 Cooper street
Epping
Vic 3076
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Country
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Australia
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Phone
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+61384058000
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Fax
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Email
45971
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[email protected]
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Contact person for scientific queries
Name
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Dr Vivek Mutha
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Address
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The Northern Hospital
185 Cooper street
Epping
Vic 3076
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Country
45972
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Australia
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Phone
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+61384058000
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Fax
45972
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Email
45972
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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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