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Trial details imported from ClinicalTrials.gov
For full trial details, please see the original record at
https://clinicaltrials.gov/ct2/show/NCT01499316
Registration number
NCT01499316
Ethics application status
Date submitted
5/12/2011
Date registered
26/12/2011
Date last updated
10/03/2014
Titles & IDs
Public title
Investigating the Effects of Hyperoxia on Fractional Flow Reserve
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Scientific title
Investigating the Effects of Hyperoxia on Fractional Flow Reserve in Patients With Moderate Coronary Artery Disease
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Secondary ID [1]
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426/11
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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:
Coronary Artery Disease
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Condition category
Condition code
Cardiovascular
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Coronary heart disease
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Cardiovascular
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Other cardiovascular diseases
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Respiratory
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Other respiratory disorders / diseases
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Intervention/exposure
Study type
Interventional
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Description of intervention(s) / exposure
Treatment: Surgery - High Flow oxygen
Treatment: Surgery - Room Air
Experimental: High Flow oxygen - 10 minute of 10/L min of inhaled oxygen with reservoir bag.
Experimental: Room Air -
Treatment: Surgery: High Flow oxygen
10 minute shigh flow oxygen
Treatment: Surgery: Room Air
Room air breathing
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Intervention code [1]
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Treatment: Surgery
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Comparator / control treatment
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Control group
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Outcomes
Primary outcome [1]
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Fractional flow reserve
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Assessment method [1]
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Timepoint [1]
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Duration of inpatient stay 2-3 days
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Secondary outcome [1]
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index of micro-vascular resistance
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Assessment method [1]
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Timepoint [1]
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Duration of inpatient stay 2-3 days
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Eligibility
Key inclusion criteria
- Adults = 18 years of age, AND
- Undergoing elective coronary angiography
- Evidence of moderate (40%-79%) stenosis, requiring further routine assessment with
FFR.
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Minimum age
18
Years
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Maximum age
90
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
- Acute coronary syndrome
- Hypoxia with oxygen saturation measured on pulse oximeter < 94% with the patient
breathing air
- Altered conscious state
- Evidence of left ventricular failure or cardiogenic shock
- Unable to perform consent prior to procedure
- Known hypersensitivity to adenosine
- Sick sinus syndrome, second or third degree atrioventricular (A-V) block (except in
patients with a functioning artificial pacemaker).
- Chronic Obstructive lung disease COPD or asthma
- Long QT syndrome
- Severe hypotension
- Concomitant use of dipyridamole
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Study design
Purpose of the study
Basic Science
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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)
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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
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Statistical methods / analysis
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Recruitment
Recruitment status
Unknown status
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Data analysis
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Reason for early stopping/withdrawal
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Other reasons
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Date of first participant enrolment
Anticipated
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Actual
1/03/2014
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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
1/12/2014
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Actual
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Sample size
Target
18
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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]
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Alfred Hospital - Melbourne
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Recruitment postcode(s) [1]
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3004 - Melbourne
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Funding & Sponsors
Primary sponsor type
Other
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Name
Bayside Health
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Address
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Country
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Ethics approval
Ethics application status
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Summary
Brief summary
Coronary artery disease (CAD) is a condition which refers to the narrowing of the small blood
vessels that supplies blood and oxygen to the heart. It is a common cause of chest-pain
related symptoms and as a result of a 'heart attack'. In most cases, to assess the severity
of the disease is to use coronary angiography, which is a medical imaging technique that uses
contrast (a dye) and x-ray to show the blood-flow supply of the coronary arteries.
The optimal treatment for patients with symptomatic coronary disease is aggressive medical
therapy. Current guidelines recommend patients with symptomatic CAD and severe disease on
angiography undergo revascularisation therapy, which aims to restore blood flow to blocked
arteries. This can be done by either percutaneous coronary intervention (feeding a small
balloon or other device on a thin tube through blood vessels to the point of blockage and
then inflate the balloon to open the artery), or coronary artery bypass grafting (open-heart
surgery)2.
For many symptomatic patients who have only moderate disease on angiography, further
functional testing is required to assess the extent of the blockage. This can be achieved by
placing a pressure wire to the artery of interest, to determine the likelihood that the
blockage impedes oxygen delivery to the heart muscle, known as the Fractional Flow Reserve
(FFR)3. FFR is commonly performed at the Alfred hospital in the assessment of such patients.
During an FFR procedure, further information regarding the health of the small arteries of
the heart can be obtained with the calculation of the index of micro-vascular resistance
(IMR),
Giving oxygen to patients with CAD is a common clinical practice, especially to all patients
in the catheterisation laboratory whose had a 'heart attack' and often administered
concurrently with light sedation during elective procedures.
Recently, however, the safety of routine supplemental oxygen in patients with CAD has been
questioned5. A research study analysed the outcomes of three small randomised studies on
oxygen in patients who experienced a 'heart attack', while suggestive of harm, the findings
of the study remain inconclusive.
There may also be deleterious effects of supplemental oxygen, on more stable patients with
CAD, who are not experiencing a 'heart attack'. Supplemental oxygen administered in the
catheterisation laboratory to patients with stable CAD, has been shown to significantly
reduce coronary artery blood flow and increase its resistance6-8. It has also been shown to
reduce cardiac output and effect the relaxation phase of the heart cycle. Based on this data
it is hypothesised that supplemental oxygen may affect FFR in patients with moderate CAD. The
investigators therefore propose to undertake a study of the effects of supplemental oxygen on
FFR in patients with moderate CAD.
The patients enrolled into the study will be scheduled for an elective normal contrast
diagnostic or interventional procedure as part of their clinically-indicated care. Once a
moderate blockage of the artery has been identified, FFR and IMR will be measured. During the
first phase of the FFR study, the patient will breathe room air and have a blood test to
measure their oxygen level (blood gas). There is a 3 minute washout period, followed by the
second phase, whereby the patient will be given 100% oxygen for 10 minutes and have another
blood gas measured.
The study will be conducted at Alfred Hospital with a total enrollment of 18 subjects. The
estimated time to complete enrollment is 6-10 months.
Data collected on each patient will include demographics, medical history, vital signs (heart
rate, blood pressure, height, and weight), usage of cardiovascular medications, pathology
results and procedural records. Any adverse events or serious adverse events related to the
study procedure will also be recorded.
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Trial website
https://clinicaltrials.gov/ct2/show/NCT01499316
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Trial related presentations / publications
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Public notes
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Contacts
Principal investigator
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Address
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Contact person for public queries
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Contact person for scientific queries
Summary Results
For IPD and results data, please see
https://clinicaltrials.gov/ct2/show/NCT01499316
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